25,512 results match your criteria quantum dots


Stable and Bright Commercial CsPbBr Quantum Dot-Resin Layers for Apparent X-ray Imaging Screen.

ACS Appl Mater Interfaces 2021 Dec 2. Epub 2021 Dec 2.

School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore.

CsPbBr quantum dots (QDs) have recently gained much interest due to their excellent optical and scintillation properties and their potential for X-ray imaging applications. In this study, we blended CsPbBr QDs with resin at different QD concentrations to achieve thick films and to protect the CsPbBr QDs from environmental moisture. Then, their scintillation properties are investigated and compared to the traditional commercial scintillators, CsI:Tl microcolumns, and Gadox layers. Read More

View Article and Full-Text PDF
December 2021

Progress and Perspective on Carbon-Based Nanozymes for Peroxidase-like Applications.

J Phys Chem Lett 2021 Dec 2:11751-11760. Epub 2021 Dec 2.

Department of Chemistry of The College of Staten Island and the Ph.D. Program of Chemistry of The Graduate Center, The City University of New York, Staten Island, New York 10314, United States.

Tumor microenvironment-responsive chemodynamic therapy (CDT), an approach based on Fenton/Fenton-like reaction to convert hydrogen peroxide (HO) into the highly cytotoxic hydroxyl radical (·OH) to kill cancer cells, represents an important direction for cancer therapy. Different types of nanozymes (nanomaterial-based catalysts that can mimic the activities of natural enzymes) have been developed to mimic peroxidase. This Perspective highlights the latest research progress regarding low-cost and biocompatible carbon-based nanozymes for peroxidase mimics. Read More

View Article and Full-Text PDF
December 2021

Photoelectric effect of hybrid ultraviolet-sensitized phototransistors from an n-type organic semiconductor and an all-inorganic perovskite quantum dot photosensitizer.

Nanoscale 2021 Dec 2. Epub 2021 Dec 2.

Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan.

Low-dimensional all-inorganic perovskite quantum dots (QDs) have been increasingly developed as photo-sensing materials in the field of photodetectors because of their strong light-absorption capability and broad bandgap tunability. Here, solution-processed hybrid phototransistors built by a dithienothiophenoquinoid (DTTQ) n-type organic semiconductor transport channel mixing with a colloidal CsPbBr perovskite QD photosensitizer are demonstrated by manipulating the relative volume ratio from 10 : 0 to 9 : 1, 7 : 3, 5 : 5, 3 : 7, 1 : 9, and 0 : 10. This results in a significantly enhanced photodetection performance owing to the advantages of a high UV absorption cross-section based on the perovskite QDs, efficient carrier transport abilities from the DTTQ semiconductor, and the photogating effect between the bulk heterojunction photocarrier transfer interfaces. Read More

View Article and Full-Text PDF
December 2021

SnS-SnS pn hetero-junction bonded on graphene with boosted charge transfer for lithium storage.

Nanoscale 2021 Dec 2. Epub 2021 Dec 2.

School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.

Despite the advantage of high capacity, practical implementation of the tin disulfide (SnS) anode for lithium-ion batteries is still plagued by the inferior rate performance due to its low intrinsic electronic conductivity and mediocre ion transport in the bulk. Herein, to address these issues, a peculiar heterojunction of SnS-SnS quantum dots (QDs) closely coupled with reduced graphene oxide (rGO) sheets was developed. Because of the typical n-type and p-type semiconductor characteristics of SnS and SnS, respectively, the formed pn junction at the SnS/SnS interface will induce a built-in electric field, which can significantly accelerate lithium-ion transport through the SnS/SnS interface. Read More

View Article and Full-Text PDF
December 2021

Tunable Performance of Quantum Dot-MoS Hybrid Photodetectors via Interface Engineering.

ACS Appl Mater Interfaces 2021 Dec 1. Epub 2021 Dec 1.

MOE Key Laboratory of Fundamental Physical Quantities Measurement & Hubei Key Laboratory of Gravitation and Quantum Physics, PGMF and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.

Heterostructures of quantum dots (QDs) and two-dimensional (2D) materials show promising potential for photodetection applications owing to their combination of high optical absorption and good in-plane carrier mobility. In this work, the performance of QD-2D photodetectors is tuned by band engineering. Devices are fabricated by coating MoS nanosheets with InP QDs, type-I core-shell InP/ZnS QDs, and type-II core-shell InP/CdS QDs. Read More

View Article and Full-Text PDF
December 2021

A Facile Approach for Elemental-Doped Carbon Quantum Dots and Their Application for Efficient Photodetectors.

Small 2021 Dec 1:e2105683. Epub 2021 Dec 1.

College of Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China.

The present work demonstrates a facile hydrothermal approach to synthesize lanthanide-doped carbon quantum dots (CQDs) with europium and/or gadolinium elements. Taking the advantage of broadband adsorption in the ultraviolet-visible region, the doped QDs are directly used as building blocks for photo-electrochemical (PEC)-type photodetectors (PDs) and their performance is systematically investigated under various conditions. The europium (Eu) and gadolinium (Gd) co-doped (C:EuGd) QDs exhibit better photo-response than the single-elemental doped ones and also show outstanding long-term stability. Read More

View Article and Full-Text PDF
December 2021

Quantum dots based sensitive nanosensors for detection of antibiotics in natural products: A review.

Sci Total Environ 2021 Nov 27:151997. Epub 2021 Nov 27.

Department of Energy, Materials and Energy Research Center, Tehran 14155-477, Iran. Electronic address:

Residual antibiotics in food products originated from administration of the antibiotics to animals may be accumulated through food metabolism in the human body and endanger safety and health. Thus, developing a prompt and accurate way for detection of antibiotics is a crucial issue. The zero-dimensional fluorescent probes including metals based, carbon and graphene quantum dots (QDs), are highly sensitive materials to use for the detection of a wide range of antibiotics in natural products. Read More

View Article and Full-Text PDF
November 2021

Preparation, characterization of naringenin, β-cyclodextrin and carbon quantum dot antioxidant nanocomposites.

Food Chem 2021 Nov 20:131646. Epub 2021 Nov 20.

Ningbo Research Institute, Zhejiang University, Ningbo 315100, China; College of Biological and Chemical Engineering, NingboTech University, Ningbo 315100, China; College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China. Electronic address:

In this work, naringenin loaded β-cyclodextrin and carbon quantum dots composite nanoparticles were successfully fabricated. The results showed that incorporation of carbon quantum dots not only enhanced antioxidant activities of nanoparticles but also improved encapsulation efficiency of naringenin. Further, the formation of composite nanoparticles was confirmed by a series of characterization methods. Read More

View Article and Full-Text PDF
November 2021

Corrigendum to "One-pot synthesis of natural amine-modified biocompatible carbon quantum dots with antibacterial activity" [J. Colloid Interface Sci. 580 (2020) 30-48].

J Colloid Interface Sci 2021 Nov 27. Epub 2021 Nov 27.

Department of Chemistry and Biochemistry, Mendel University in Brno, Zemedelska 1, 613 00 Brno, Czech Republic; Central European Institute of Technology, Brno University of Technology, Purkyňova 123, 61 200 Brno, Czech Republic. Electronic address:

View Article and Full-Text PDF
November 2021

Chiral Quantum Metamaterial for Hypersensitive Biomolecule Detection.

ACS Nano 2021 Nov 30. Epub 2021 Nov 30.

School of Chemistry, University of Glasgow, Glasgow G12 8QQ, United Kingdom.

Chiral biological and pharmaceutical molecules are analyzed with phenomena that monitor their very weak differential interaction with circularly polarized light. This inherent weakness results in detection levels for chiral molecules that are inferior, by at least six orders of magnitude, to the single molecule level achieved by state-of-the-art chirally insensitive spectroscopic measurements. Here, we show a phenomenon based on chiral quantum metamaterials (CQMs) that overcomes these intrinsic limits. Read More

View Article and Full-Text PDF
November 2021