Publications by authors named "Youxing Fang"

38 Publications

Glucose-oxidase like catalytic mechanism of noble metal nanozymes.

Nat Commun 2021 06 7;12(1):3375. Epub 2021 Jun 7.

State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Jilin, PR China.

Au nanoparticles (NPs) have been found to be excellent glucose oxidase mimics, while the catalytic processes have rarely been studied. Here, we reveal that the process of glucose oxidation catalyzed by Au NPs is as the same as that of natural glucose oxidase, namely, a two-step reaction including the dehydrogenation of glucose and the subsequent reduction of O to HO by two electrons. Pt, Pd, Ru, Rh, and Ir NPs can also catalyze the dehydrogenation of glucose, except that O is preferably reduced to HO. By the electron transfer feature of noble metal NPs, we overcame the limitation that HO must be produced in the traditional two-step glucose assay and realize the rapid colorimetric detections of glucose. Inspired by the electron transport pathway in the catalytic process of natural enzymes, noble metal NPs have also been found to mimic various enzymatic electron transfer reactions including cytochrome c, coenzymes as well as nitrobenzene reductions.
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http://dx.doi.org/10.1038/s41467-021-23737-1DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8184917PMC
June 2021

Fabrication of a Novel, Cost-Effective Double-Sided Indium Tin Oxide-Based Nanoribbon Electrode and Its Application of Acute Toxicity Detection in Water.

ACS Sens 2020 12 11;5(12):3923-3929. Epub 2020 Dec 11.

State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science, Changchun, Jilin 130022, P. R. China.

Microelectrode plays a crucial role in developing a rapid biosensor for detecting toxicity in water. In this study, a nanoribbon electrode (NRE) with amplified microelectrode signal was successfully prepared by electrodepositing 2-allylphenol on a double-sided indium tin oxide glass. The NRE provided a simple mean for obtaining large steady-state current response. Its advantages were discussed by contrasting the toxicity detection of 3,5-dichlorophenol (DCP) with single microelectrode, microelectrode array, and millimeter electrode as working electrodes in which potassium ferricyanide (K[Fe(CN)]) was adopted as a mediator, and was selected as bioreceptor. At a constant potential of 450 mV, the current reached a steady state within 10 s. The biosensor was constructed using the NRE as working electrode, and its feasibility was verified by determining the toxicity of DCP. A 50% inhibitory concentration (IC) of 3.01 mg/L was obtained by analyzing the current responses of different concentrations of DCP within 1 h. These results exhibited that the proposed method based on the as-prepared NRE was a rapid, sensitive, and cost-effective way for toxicity detection in water.
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http://dx.doi.org/10.1021/acssensors.0c01566DOI Listing
December 2020

Coenzyme-dependent nanozymes playing dual roles in oxidase and reductase mimics with enhanced electron transport.

Nanoscale 2020 Dec;12(46):23578-23585

State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, PR China.

Although nanozymes overcome a series of shortcomings of natural enzymes, their wide applications are hampered due to their limited varieties. In this work, we propose a coenzyme-dependent nanozyme, a synergistic composite comprising zeolitic imidazolate frameworks encapsulated with polyethylenimine (PEI) and functionalized with a flavin mononucleotide (PEI/ZIF-FMN). The flavin mononucleotide (FMN) plays the role of a prosthetic group, and the positively charged NH2 groups in PEI readily provide the binding affinity to nicotinamide adenine dinucleotide (NADH), which facilitates the electron transfer from NADH to FMN and terminal electron acceptors (such as O2) with a greatly enhanced (80 times) catalytic performance. The integrated nanoparticle-coenzyme composite works as an NADH oxidase mimic and couples with dehydrogenases for the tandem enzymatic reaction. PEI/ZIF-FMN also mediated the electron transfer from NADH to cytochrome c (Cyt c), thereby exhibiting Cyt c reductase-like activity.
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http://dx.doi.org/10.1039/d0nr06605bDOI Listing
December 2020

Synthesis of low dimensional hierarchical transition metal oxides a direct deep eutectic solvent calcining method for enhanced oxygen evolution catalysis.

Nanoscale 2020 Oct;12(40):20719-20725

State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, P. R. China. and University of Science and Technology of China, Hefei, Anhui 230026, P. R. China and University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.

Transition metal oxides (TMOs) are regarded as important materials due to their wide applications in catalysis, sensors, energy storage and conversion devices owing to their advantages of facile synthesis, low cost, and high activity. Here we develop a direct deep eutectic solvent (DES) calcining method to prepare low-dimensional and highly active TMOs for the electrochemical oxygen evolution reaction (OER). Glucose monohydrate and urea can form a glucose-urea DES, which was calcined under a N2 atmosphere to produce 2D N,O-doped graphene. When metal precursors were introduced into the glucose-urea DES and calcined together, the TMOs were templated by graphene flakes and exhibited low-dimensional morphologies. With this method, 2D nanonet-shaped La0.5Sr0.5Co0.8Fe0.2O3 (LSCF), Co3O4, NiCo2O4, and RuO2 and 1D nanowire-shaped Ba0.5Sr0.5Co0.8Fe0.2O3 (BSCF) were readily synthesized, and their thickness and porosity can be conveniently tuned by adjusting the concentrations of metal salts. Our nanostructured TMOs were further applied for the OER, and they showed quite competitive activities over their counterparts obtained from other methods. The 2D porous LSCF20-DES exhibited the largest specific surface area (28.9 m2 g-1) and the highest OER electrocatalytic activities (0.304 V overpotential at a current density of 10 mA cm-2). These results demonstrate that the DES calcining method is a comprehensive approach to synthesize hierarchical TMOs as highly active OER catalysts.
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http://dx.doi.org/10.1039/d0nr04378hDOI Listing
October 2020

Oxidase-like MOF-818 Nanozyme with High Specificity for Catalysis of Catechol Oxidation.

J Am Chem Soc 2020 09 27;142(36):15569-15574. Epub 2020 Aug 27.

College of Chemistry, Jilin University, Changchun 130012, P. R. China.

Despite the extensive studies of the nanozymes showing their superior properties compared to natural enzymes and traditional artificial enzymes, the development of highly specific nanozymes is still a challenge. The catechol oxidase specifically catalyzing the oxidations of -diphenol to the corresponding -quinone is important to the biosynthesis of melanin and other polyphenolic natural products. In this study, we first propose that MOF-818, containing trinuclear copper centers mimicking the active sites of natural catechol oxidase, shows efficient catechol oxidase activity with good specificity and no peroxidase-like characteristics. MOF-818 has good specificity and high catalytic activity as a novel catechol oxidase nanozyme.
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http://dx.doi.org/10.1021/jacs.0c07273DOI Listing
September 2020

An unexpected discovery of 1,4-benzoquinone as a lipophilic mediator for toxicity detection in water.

Analyst 2020 Aug 10;145(15):5266-5272. Epub 2020 Jul 10.

Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Science, Changchun 130102, Jilin, P. R. China.

Since most toxicological risk assessments are based on individual single-species tests, there is uncertainty in extrapolating these results to ecosystem assessments. Herein, we successfully developed a mediated microbial electrochemical biosensor with mixed microorganisms for toxicity detection by microelectrode array (MEA). In order to fully mobilize all the mixed microorganisms to participate in electron transfer to amplify the current signal, 1,4-benzoquinone (BQ) was used as the lipophilic mediator to mediate the intracellular metabolic activities. Hydrophilic K[Fe(CN)] was employed as an extracellular electron acceptor to transport electrons from hydroquinone (HQ) to the working electrode. Under the optimal conditions of 50 mM phosphate buffer solution (PBS), 0.4 mM BQ, 10 mM K[Fe(CN)] and OD = 0.5 bacteria concentration, the half-maximal inhibitory concentration (IC) values measured with the composite-mediated respiration (CM-RES) of BQ-K[Fe(CN)] for Cu, Cd and Zn were 5.95, 7.12 and 8.86 mg L, respectively. IC values obtained with the single mediator K[Fe(CN)] were 2.34, 5.88 and 2.42 mg L for the same samples. The results indicate that the biosensor with the single mediator K[Fe(CN)] had higher sensitivity to heavy metal ions than the biosensor with composite mediators. After verification, we found that the addition of BQ cannot amplify the current. The IC value of 0.89 mg L for BQ was obtained using K[Fe(CN)] as the single mediator. This suggests that BQ is highly toxic, which explained why the sensitivity of the biosensor with the combined mediator BQ-K[Fe(CN)] was lower than that of the biosensor with the single mediator K[Fe(CN)]. At the same time, this also implies that toxicity itself cannot be ignored when it is used as an electronic mediator in a mediated microbial electrochemical biosensor.
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http://dx.doi.org/10.1039/d0an00991aDOI Listing
August 2020

Coupling Cu with Au for enhanced electrocatalytic activity of nitrogen reduction reaction.

Nanoscale 2020 Jan;12(3):1811-1816

College of Chemistry, Jilin University, Changchun, Jilin 130012, P.R. China.

The electrochemical nitrogen reduction reaction (NRR) under ambient conditions is currently attracting intense attention, but it still remains a great challenge to develop highly selective and active NRR electrocatalysts. Inspired by the intrinsic NRR activity of Au, we systematically studied the synergistic enhanced effect of incorporating other transition metals into Au on its NRR activity. A general strategy was used to synthesize a series of Au-based bimetallic nanocatalysts (AuCu, AuAg, AuPd and AuRu), and the NRR catalytic performance of the as-obtained electrocatalysts was investigated in detail. The experimental results indicate that the positive effect of Cu on NRR was the most remarkable in comparison with that of Ag, Ru and Pd, which can be ascribed to the synergy of the Au and Cu components via modulating the electronic structure and further changing the binding affinity of adsorbed N atoms on the catalyst. Finally, the optimized nanocatalyst with the atom ratio of Au1Cu1 achieved the highest faradaic efficiency (54.96%) and ammonia yield rate (154.91 μg h-1 mgcat-1) at -0.2 V vs. RHE, exceeding those of the previously reported Au nanocatalysts.
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http://dx.doi.org/10.1039/c9nr08788eDOI Listing
January 2020

A respiration substrate-less isolation method for acute toxicity assessment.

Chemosphere 2020 Apr 29;244:125511. Epub 2019 Nov 29.

State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, PR China. Electronic address:

Respiration substrate (RS)-less isolation method was developed for enhancing the sensitivity of acute toxicity assessment of heavy metal ions. RS was removed from the first step of previous isolation method, which was an effective strategy for improving acute toxicity assessment. 50% inhibiting concentration (IC) values of Cu, Cd, Zn, Hg and Ni were 0.39 mg L, 5.99 mg L, 3.99 mg L, 0.23 mg L and 5.74 mg L, respectively. Beyond that, the complicacy of organic toxicants assessments was investigated by choosing 3,5-dichlorophenol (DCP) as model toxicant. Biofilm sensor, morphology method and suspended microbes-based methods including one-pot method, RS-isolation method, RS-less isolation method, RS-less isolation method with added potassium ferricyanide (+F), were compared. The sensitivity to DCP can be ranked as morphology method > suspended microbes-based methods > biofilm method. The difference of the present results implicated that the methodological interference, leading in different detection mechanisms of these methods. The relative investigations can provide theoretical guidance for developing comprehensive detection methods of pollutants.
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http://dx.doi.org/10.1016/j.chemosphere.2019.125511DOI Listing
April 2020

Bio-inspired nanozyme: a hydratase mimic in a zeolitic imidazolate framework.

Nanoscale 2019 Mar;11(13):5960-5966

State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, PR China.

Nanozymes provide comparative advantages over natural enzymes and conventional artificial enzymes for catalytic reactions. However, nanozymes are only suitable for limited types of reactions, whose catalytic principles are not yet fully revealed. Herein, a new nanozyme based on a bionic zeolitic imidazolate framework is proposed. Zeolitic imidazolate framework-8 (ZIF-8) possesses a similar geometric structure to that of the active center of human carbonic anhydrase II (hCAII) and exhibits catalytic performance analogous to that of the hCAII. The less imidazolate coordinated zinc cations on the external surface of ZIF-8 can act as Lewis acid sites, lowering the pKa of Zn-bound H2O molecules from 14 to 8.4, which facilitates the deprotonation of H2O molecules and generation of zinc-bound hydroxide nucleophiles. The esterase-like ZIF-8 nanozyme shows a similar affinity to p-nitrophenyl acetate compared with hCAII. The ZIF-8 nanozyme also promotes CO2 hydration and acetylthiocholine hydrolysis reaction, and a series of ZIFs are also found with intrinsic enzyme-like activities due to similar compositions and spatial structures. These results imply that the bionic nanoparticles can be developed to fabricate a new generation of nanozymes by mimicking the active sites of natural enzymes.
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http://dx.doi.org/10.1039/c9nr01093aDOI Listing
March 2019

In situ reversible color variation of a ready-made upconversion material using the designed component of a three-state fluorescence switching system.

Nanoscale 2019 Feb;11(8):3718-3724

State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China.

In recent years, upconversion materials have attracted considerable attention because of their unique physicochemical features. Numerous studies have focused on the synthesis of upconversion materials with different colors. However, an easier way to vary the upconversion colors without changing the materials' components has not been extensively studied. In this study, we realized the in situ color variation of the designed upconversion material with the help of a three-state fluorescence switching hybrid device. The device was composed of Prussian blue and upconversion materials; the former element functioned as a fluorescence resonance energy transfer acceptor and the latter acted as a donor. Smartly applying the RGB color model guaranteed multicolor of the device. Moreover, the highest fluorescence contrast of the three-state fluorescence switching system was 86% (larger than the result of a previous study), and the three-state reversibility was remarkable; this was probably owing to the unique layer-by-layer dripping/electrodepositing assembly method. To the best of our knowledge, the in situ reversible color variation of the ready-made upconversion material has been demonstrated for the first time.
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http://dx.doi.org/10.1039/c8nr07848cDOI Listing
February 2019

Reversible regulation of CdTe quantum dots fluorescence intensity based on Prussian blue with high anti-fatigue performance.

Chem Commun (Camb) 2019 Jan 18;55(5):644-647. Epub 2018 Dec 18.

State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, China.

A fluorescence switching device with excellent anti-fatigue performance based on the electrochromic material Prussian blue and fluorophore CdTe quantum dots was realized. The fluorescence switching device ultimately demonstrated a high fluorescence contrast, short response time and superior anti-fatigue property. Notably, the fluorescence contrast remains unchanged after 133 cycles.
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http://dx.doi.org/10.1039/c8cc07693fDOI Listing
January 2019

DNA-templated silver and silver-based bimetallic clusters with remarkable and sequence-related catalytic activity toward 4-nitrophenol reduction.

Chem Commun (Camb) 2019 Jan;55(3):373-376

State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, P. R. China.

Herein, we report the excellent catalytic activity of DNA-AgNCs toward 4-nitrophenol reduction and a strategy for improving their catalytic performance by forming bimetallic clusters (Ag-Pd, Ag-Au and Ag-Pt). The analogous influence of sequences on the catalytic activity of these nanoclusters is disclosed, which is quite different from their erratic fluorescence properties.
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http://dx.doi.org/10.1039/c8cc08810aDOI Listing
January 2019

Electrochemical fabrication of nanoporous gold electrodes in a deep eutectic solvent for electrochemical detections.

Chem Commun (Camb) 2018 Aug;54(64):8853-8856

State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China.

Deep eutectic solvents are a class of green and sustainable solvents in chemical processes. An electrochemical method was developed to fabricate nanoporous gold electrodes by alloying and dealloying Au-Zn alloy in ZnCl2-urea deep eutectic solvent. The as-prepared active nanoporous gold electrodes facilitate the electrochemical detections of water pollutants with superior sensitivities.
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http://dx.doi.org/10.1039/c8cc04454fDOI Listing
August 2018

Shape-Control of Pt-Ru Nanocrystals: Tuning Surface Structure for Enhanced Electrocatalytic Methanol Oxidation.

J Am Chem Soc 2018 01 16;140(3):1142-1147. Epub 2018 Jan 16.

State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science , Changchun, Jilin 130022, P. R. China.

Despite the fact that both electrochemical experiments and density functional theory calculations have testified to the superior electrocatalytic activity and CO-poisoning tolerance of platinum-ruthenium (PtRu) alloy nanoparticles toward the methanol oxidation reaction (MOR), the facet-dependent electrocatalytic properties of PtRu nanoparticles are scarcely revealed because it is extremely difficult to synthesize well-defined facets-enclosed PtRu nanocrystals. Herein, we for the first time report a general synthesis of ultrathin PtRu nanocrystals with tunable morphologies (nanowires, nanorods, and nanocubes) through a one-step solvothermal approach and a systematic investigation of the structure-directing effects of different surfactants and the formation mechanism by control experiments and time-dependent studies. In addition, we utilize these {100} and {111} facets-enclosed PtRu nanocrystals as model catalysts to evaluate the electrocatalytic characteristics of the MOR on different facets. Remarkably, {111}-terminated PtRu nanowires exhibit much higher stability and electrocatalytic mass activity toward MOR, which are 2.28 and 4.32 times higher than those of {100}-terminated PtRu nanocubes and commercial Pt/C, respectively, indicating that PtRu {111} facets possess superior methanol oxidation activity and CO-poisoning resistance relative to {100} facets. Our present work provides a series of well-defined PtRu nanocrystals with tunable facets which would be ideal model electrocatalysts for fundamental research in fuel cell electrocatalysis.
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http://dx.doi.org/10.1021/jacs.7b12353DOI Listing
January 2018

New applications of genetically modified Pseudomonas aeruginosa for toxicity detection in water.

Chemosphere 2017 Oct 29;184:106-111. Epub 2017 May 29.

State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science, 5625 Renmin Street, Changchun 130022, Jilin Province, PR China; University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, PR China. Electronic address:

A novel mediator-free method based on genetically modified bacteria was developed for detecting water toxicity, where genetically modified Pseudomonas aeruginosa (GM P. aeruginosa) was selected as the biosensor strain and pyocyanin (PYO) produced by this strain was used as the indicator. The toxicity response of GM P. aeruginosa to 3, 5-dichlorophenol (3, 5-DCP) was measured electrochemically and spectroscopically, and the half maximal inhibitory concentration (IC) of 3, 5-DCP was determined to be 15.1 mg/L. Strikingly, the toxicity of sample solution with 3, 5-DCP could also be estimated visually by naked eyes at a concentration as low as 10 mg/L. The present study provided a convenient, sensitive and cost-effective method for water toxicity detection, and extended biosensing application of the genetically modified bacterium.
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http://dx.doi.org/10.1016/j.chemosphere.2017.05.154DOI Listing
October 2017

One-step synthesis of ultrathin PtPb nerve-like nanowires as robust catalysts for enhanced methanol electrooxidation.

Nanoscale 2017 Jan 1;9(1):201-207. Epub 2016 Dec 1.

State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science, Changchun, Jilin 130022, PR China.

Ultrathin PtPb nerve-like nanowires (NNWs) with a diameter of only around 3.6 nm were synthesized by a one-step wet-chemical strategy, and they served as robust catalysts for greatly enhancing methanol electrooxidation both under acidic and alkaline conditions. Due to the high CO-poisoning tolerance, superior electrocatalytic activity and stability endowed by the Pt-Pb alloyed composition and the unique structure, the PtPb NNWs showed the highest specific activity of 2.78 mA cm in acidic media and 6.51 mA cm in alkaline media toward the methanol oxidation reaction (MOR), which are 5.24 and 4.12 times higher than those of the commercial Pt/C catalysts, respectively. Meanwhile, the demonstrated synthetic strategy for Pt-Pb nanocrystals may stimulate more inspiration and strategies of the novel metal-based nanocrystals for promising applications in electrocatalysis.
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http://dx.doi.org/10.1039/c6nr07036aDOI Listing
January 2017

A high performance hybrid battery based on aluminum anode and LiFePO4 cathode.

Chem Commun (Camb) 2016 Jan 15;52(8):1713-6. Epub 2015 Dec 15.

Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.

A novel hybrid battery utilizing an aluminum anode, a LiFePO4 cathode and an acidic ionic liquid electrolyte based on 1-ethyl-3-methylimidazolium chloride (EMImCl) and aluminum trichloride (AlCl3) (EMImCl-AlCl3, 1-1.1 in molar ratio) with or without LiAlCl4 is proposed. The hybrid ion battery delivers an initial high capacity of 160 mA h g(-1) at a current rate of C/5. It also shows good rate capability and cycling performance.
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http://dx.doi.org/10.1039/c5cc09019aDOI Listing
January 2016

Polymerized Ionic Networks with High Charge Density: Quasi-Solid Electrolytes in Lithium-Metal Batteries.

Adv Mater 2015 Dec 2;27(48):8088-94. Epub 2015 Nov 2.

Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.

Polymerized ionic networks (PINs) with six ion pairs per repeating unit are synthesized by nucleophilic-substitution-mediated polymerization or radical polymerization of monomers bearing six 1-vinylimidazolium cations. PIN-based solid-like electrolytes show good ionic conductivities (up to 5.32 × 10(-3) S cm(-1) at 22°C), wide electrochemical stability windows (up to 5.6 V), and good interfacial compatibility with the electrodes.
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http://dx.doi.org/10.1002/adma.201502855DOI Listing
December 2015

Polymer gel electrolytes for application in aluminum deposition and rechargeable aluminum ion batteries.

Chem Commun (Camb) 2016 Jan 29;52(2):292-5. Epub 2015 Oct 29.

Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.

A polymer gel electrolyte using AlCl3 complexed acrylamide as a functional monomer and acidic ionic liquid based on a mixture of 1-ethyl-3-methylimidazolium chloride (EMImCl) and AlCl3 (EMImCl-AlCl3, 1-1.5, in molar ratio) as a plasticizer has been successfully prepared for the first time via free radical polymerization. Aluminum deposition is successfully achieved using a polymer gel electrolyte containing 80 wt% ionic liquid. The polymer gel electrolytes are also good candidates for rechargeable aluminum ion batteries.
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http://dx.doi.org/10.1039/c5cc06643cDOI Listing
January 2016

New ionic liquids based on the complexation of dipropyl sulfide and AlCl3 for electrodeposition of aluminum.

Chem Commun (Camb) 2015 Sep;51(68):13286-9

Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.

A new kind of ionic liquid based on the complexation of dipropyl sulfide (DPS) and AlCl3 has been prepared. The equivalent concentration of AlCl3 in the ionic liquid is as high as 2.3 M. More importantly, it is highly fluidic and exhibits an ambient ionic conductivity of 1.25 × 10(-4) S cm(-1). This new ionic liquid can be successfully used as an electrolyte for electrodeposition of aluminum.
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http://dx.doi.org/10.1039/c5cc05233eDOI Listing
September 2015

Porous liquids: a promising class of media for gas separation.

Angew Chem Int Ed Engl 2015 Jan 17;54(3):932-6. Epub 2014 Nov 17.

Chemical Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 (USA).

A porous liquid containing empty cavities has been successfully fabricated by surface engineering of hollow structures with suitable corona and canopy species. By taking advantage of the liquid-like polymeric matrices as a separation medium and the empty cavities as gas transport pathway, this unique porous liquid can function as a promising candidate for gas separation. Moreover, such a facile synthetic strategy can be further extended to the fabrication of other types of nanostructure-based porous liquid, opening up new opportunities for preparation of porous liquids with attractive properties for specific tasks.
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http://dx.doi.org/10.1002/anie.201409420DOI Listing
January 2015

Electrochemical biosensors on platforms of graphene.

Chem Commun (Camb) 2013 Oct;49(83):9526-39

State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China.

In recent years, graphene, the two-dimensional closely packed honeycomb carbon lattice, has been attracting much attention in the field of electrochemistry due to its intrinsic properties and merits. Efforts to create novel graphene based electrochemical biosensors have led to the establishment of effective strategies for diverse bioassays, from simple molecules to complex biotargets. In this Feature Article, we provide an overview of electrochemical biosensing with graphene related materials, and discuss the role of graphene in different sensing protocols.
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http://dx.doi.org/10.1039/c3cc44735aDOI Listing
October 2013

Simple and direct synthesis of oxygenous carbon supported palladium nanoparticles with high catalytic activity.

Nanoscale 2013 Mar 1;5(5):1843-8. Epub 2013 Feb 1.

State Key Laboratory of Electroanalytical Chemistry, Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China.

A concise synthesis of Pd nanoparticles encapsulated in a sponge-like carbonaceous support (Pd/C) was achieved by mixing a solution containing water, ethylene glycol and Pd(II) with diphosphorus pentoxide, leading to excellent catalytic performance of Pd/C towards the reduction of the model aromatic nitro compound.
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http://dx.doi.org/10.1039/c3nr34004jDOI Listing
March 2013

Gold nanocluster-based electrochemically controlled fluorescence switch surface with prussian blue as the electrical signal receptor.

Chem Commun (Camb) 2013 Jan 22;49(3):243-5. Epub 2012 Nov 22.

State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Changchun, 130022, China.

A highly robust electrochemically controlled fluorescence switch based on ultrasmall Au nanoclusters has been designed by the aid of the electrochemical redox reaction of prussian blue.
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http://dx.doi.org/10.1039/c2cc36316jDOI Listing
January 2013

G-quadruplex-based ultrasensitive and selective detection of histidine and cysteine.

Biosens Bioelectron 2013 Mar 25;41:563-8. Epub 2012 Sep 25.

State Key Lab of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China.

Histidine and cysteine detection is critically important since an abnormal level of histidine or cysteine is an indicator for many diseases. In this paper, we demonstrated a novel label-free, G-quadruplex-based approach for simultaneous detection of histidine and cysteine. The present assay is based on the highly specific interaction among amino acids (histidine or cysteine), Cu(2+) and NMM/G-4 (NMM: N-methylmesoporphyrin IX; G-4: G-quadruplex). The fluorescence intensity of NMM was dramatically enhanced in the presence of G-quadruplex formed from 24GT, which can be effectively quenched by cupric ion (Cu(2+)) due to the chelation of Cu(2+) by NMM as well as the unfolding of G-quadruplex by Cu(2+). The presence of histidine or cysteine will disturb the interaction between Cu(2+) and NMM/G-4 because of the strong binding affinity of Cu(2+) to the imidazole group of histidine or the interaction of Cu(2+) with thiol group in cysteine, leading to distinct fluorescence emission intensity. High selectivity is conferred by the use of cysteine-masking agent N-ethylmaleimide (NEM), which helps to discriminate histidine from cysteine. At last, a novel and simple approach was developed to determine each precise concentration of histidine and cysteine according to the different response of the system with and without NEM. Importantly, histidine can be also detected even in the presence of a large amount of other amino acids. A detection limit as low as 3 nM for histidine and 5 nM for cysteine was obtained by practical measurement rather than conventional calculation (S/N=3), confirming the high sensitivity of the present approach. Meanwhile, this sensing protocol can determine histidine and cysteine in diluted biological samples such as urine, exhibiting great potential to meet the need of practical application.
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http://dx.doi.org/10.1016/j.bios.2012.09.024DOI Listing
March 2013

Polyoxometalate-based inorganic-organic hybrid film structure with reversible electroswitchable fluorescence property.

Chem Commun (Camb) 2012 Feb 13;48(15):2101-3. Epub 2012 Jan 13.

State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Changchun, 130022, China.

A novel inorganic-organic hybrid film structure based on polyoxometalate and conventional organic dye has been fabricated, whose fluorescence can be reversibly switched using the electrochromic component to activate or suppress the related fluorescence quenching mechanism upon applying reduction or oxidation potentials of polyoxometalates.
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http://dx.doi.org/10.1039/c2cc16523fDOI Listing
February 2012

Easy synthesis and imaging applications of cross-linked green fluorescent hollow carbon nanoparticles.

ACS Nano 2012 Jan 29;6(1):400-9. Epub 2011 Dec 29.

State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, People's Republic of China.

We propose an ingenious method for synthesizing cross-linked hollow fluorescent carbon nanoparticles (HFCNs) with green emission by simply mixing acetic acid, water, and diphosphorus pentoxide. This is an automatic method without external heat treatment to rapidly produce large quantities of HFCNs, in contrast to other syntheses of fluorescent carbon nanoparticles that required high temperature, complicated operations, or long reaction times. Characterizations of HFCNs through high-resolution transmission electron microscopy, infrared/Raman spectroscopy, and X-ray diffraction indicate that abundant small oxygenous graphite domains existed and endowed the HFCNs with fluorescent properties. After simple post-treatments, the cross-linked HFCNs can be used for cell-imaging applications. Compared with traditional dyes and CdTe quantum dots, HFCNs are the superior fluorescent bioimaging agent according to their low toxicity, stability, and resistance to photobleaching. The HFCNs were also applied to watermark ink and fluorescent powder, showing their promising potentials for further wide usage.
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http://dx.doi.org/10.1021/nn2046373DOI Listing
January 2012

A binary functional substrate for enrichment and ultrasensitive SERS spectroscopic detection of folic acid using graphene oxide/Ag nanoparticle hybrids.

ACS Nano 2011 Aug 15;5(8):6425-33. Epub 2011 Jul 15.

State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science, Graduate School of the Chinese Academy of Sciences, Changchun 130022, Jilin, People's Republic of China.

Herein graphene oxide/Ag nanoparticle hybrids (GO/PDDA/AgNPs) were fabricated according to a self-assembly procedure. Using the obtained GO/PDDA/AgNPs as SERS substrates, an ultrasensitive and label-free detection of folic acid in water and serum was demonstrated based on the inherent SERS spectra of folic acid. The modified graphene oxide exhibited strong enrichment of folic acid due to the electrostatic interaction, and the self-assembled Ag nanoparticles greatly enhanced the SERS spectra of folic acid, both of which led to an ultrahigh sensitivity. Therefore, although the SERS enhancement of p-ATP on GO/PDDA/AgNPs was weaker than that on Ag nanoparticles, the SERS signals of folic acid on GO/PDDA/AgNPs were much stronger than that on Ag nanoparticles. To improve the detection, the concentration of GO/PDDA/AgNPs was optimized to reduce background of the graphene oxide. The SERS spectra of the folic acid showed that the minimum detected concentration of folic acid in water was as low as 9 nM with a linear response range from 9 to 180 nM. To estimate the feasibility of the detection method based on GO/PDDA/AgNPs for the practical applications, diluted serum containing different concentrations of folic acid was taken as real samples. It was established that the sensitivity and the linear range for the folic acid in serum were comparable to that in water. This ultrasensitive and label-free SERS detection of folic acid based on GO/PDDA/AgNPs offers great potential for practical applications of medicine and biotechnology.
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http://dx.doi.org/10.1021/nn201606rDOI Listing
August 2011

Reversibly electroswitched quantum dot luminescence in aqueous solution.

ACS Nano 2011 Jun 24;5(6):5249-53. Epub 2011 May 24.

State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Changchun 130022, China.

In this study, we fabricated a novel hybrid film system, in which reversible electroswitching quantum dot (QD) luminescence was realized in aqueous solution for the first time. On the basis of an electrochromic material, poly(methylene blue) (PMB), QD luminescence could be switched effectively in a narrow potential range of -0.4 to 0 V via the corresponding luminescence quenching effect. The luminescence switching operation was reversible and reproducible, and no noticeable changes in both "on" and "off" luminescence intensities were observed in 20 cycles. This simple system not only effectively overcame the harsh operation environment that generally existed in previous reports but also provided an easy method for the design and fabrication of other novel QD electroswitchable hybrid components.
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http://dx.doi.org/10.1021/nn201455aDOI Listing
June 2011

Twenty second synthesis of Pd nanourchins with high electrochemical activity through an electrochemical route.

Langmuir 2010 Dec 28;26(23):17816-20. Epub 2010 Oct 28.

State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, China.

A rapid, templateless, surfactantless, electrochemical route is reported to synthesize uniform and clean Pd nanoparticles (∼350 nm in diameter) with a substructure of sharp nanospikes (∼95 nm in length). The effects of electrodeposition potential, PdCl(2) concentration, and supporting electrolyte were explored for the formation of the Pd nanourchins. The systematic studies revealed that the concentration of Pd(II) greatly affects the density of the nanospikes on the Pd nanourchins in this short-time synthesis. The substructure of the nanospikes on the nanourchins was examined to be a single-crystal quadrangular pyramid. Further investigation of the Pd nanourchins by cyclic voltammetry (CV) showed their high electrochemical activity toward formic acid oxidation.
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http://dx.doi.org/10.1021/la1036597DOI Listing
December 2010