899 results match your criteria switching bipolar

Nonvolatile resistive switching and synaptic characteristics of lead-free all-inorganic perovskite-based flexible memristive devices for neuromorphic systems.

Nanoscale 2021 May 4. Epub 2021 May 4.

Department of Applied Science and Humanities, Assam University, Silchar 788011, India.

Recently, several types of lead halide perovskites have been actively researched for resistive switching (RS) memory or artificial synaptic devices due to their current-voltage hysteresis along with the feasibility of fabrication, low-temperature processability and superior charge mobility. However, the toxicity and environmental pollution potential of lead halide perovskites severely restrict their large-scale commercial prospects. In the present work, the environmentally friendly and uniform CsSnCl3 perovskite films are introduced to act as an active layer in the flexible memristors. Read More

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Memristive Behavior of Mixed Oxide Nanocrystal Assemblies.

ACS Appl Mater Interfaces 2021 May 3;13(18):21635-21644. Epub 2021 May 3.

Department of Mechanical and Industrial Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States.

Recent advances in memristive nanocrystal assemblies leverage controllable colloidal chemistry to induce a broad range of defect-mediated electrochemical reactions, switching phenomena, and modulate active parameters. The sample geometry of virtually all resistive switching studies involves thin film layers comprising monomodal diameter nanocrystals. Here we explore the evolution of bipolar and threshold resistive switching across highly ordered, solution-processed nanoribbon assemblies and mixtures comprising BaZrO (BZO) and SrZrO (SZO) nanocrystals. Read More

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Solution-Processed Stretchable Ag S Semiconductor Thin Films for Wearable Self-Powered Nonvolatile Memory.

Adv Mater 2021 Apr 30:e2100066. Epub 2021 Apr 30.

Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea.

Compared with the large plastic deformation observed in ductile metals and organic materials, inorganic semiconductors have limited plasticity (<0.2%) due to their intrinsic bonding characters, restricting their widespread applications in stretchable electronics. Herein, the solution-processed synthesis of ductile α-Ag S thin films and fabrication of all-inorganic, self-powered, and stretchable memory devices, is reported. Read More

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Field-Free Deterministic Magnetization Switching Induced by Interlaced Spin-Orbit Torques.

ACS Appl Mater Interfaces 2021 May 22;13(17):20763-20769. Epub 2021 Apr 22.

Fert Beijing Research Institute, MIIT Key Laboratory of Spintronics, School of Integrated Circuit Science and Engineering, Beihang University, Beijing 100191, China.

Spin-orbit torque (SOT) magnetic random access memory is envisioned as an emerging nonvolatile memory due to its ultrahigh speed and low power consumption. The field-free switching scheme in SOT devices is of great interest to both academia and industry. Here, we propose a novel field-free deterministic magnetization switching scheme in a regular magnetic tunnel junction by using two currents sequentially passing interlaced paths, with less requirements of the manufacturing process or additional physical effects. Read More

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A synaptic memristor based on two-dimensional layered WSe nanosheets with short- and long-term plasticity.

Nanoscale 2021 Apr 29;13(13):6654-6660. Epub 2021 Mar 29.

College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China.

Neural synapses with diverse synaptic functions of short- and long-term plasticity are highly desired for developing complex neuromorphic systems. A memristor with its two terminals serving as pre- and post-neurons, respectively, can emulate two neuronal-based synaptic functions. In this work, multilayer two-dimensional (2D) layered WSe nanosheets are synthesized by a salt-assisted chemical vapor deposition (CVD) method. Read More

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Precision medicine for mood disorders: objective assessment, risk prediction, pharmacogenomics, and repurposed drugs.

Mol Psychiatry 2021 Apr 8. Epub 2021 Apr 8.

Department of Psychiatry, Indiana University School of Medicine, Indianapolis, IN, USA.

Mood disorders (depression, bipolar disorders) are prevalent and disabling. They are also highly co-morbid with other psychiatric disorders. Currently there are no objective measures, such as blood tests, used in clinical practice, and available treatments do not work in everybody. Read More

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Resistive Switching of the Tetraindolyl Derivative in Ultrathin Films: A Potential Candidate for Nonvolatile Memory Applications.

Langmuir 2021 Apr 6;37(15):4449-4459. Epub 2021 Apr 6.

Department of Physics, Jadavpur University, Jadavpur, Kolkata 700032, India.

Bipolar resistive switching using organic molecule is very promising for memory applications owing to their advantages, such as simple device structure, low manufacturing cost, stability, and flexibility. Herein we report Langmuir-Blodgett (LB) and spin-coated-film-based bipolar resistive switching devices using organic material 1,4-bis(di(1-indol-3-yl)methyl)benzene (Indole1). The pressure-area per molecule isotherm (π-), Brewster angle microscopy (BAM), atomic force microscopy (AFM), and scanning electron microscopy (SEM) were used to formulate an idea about the organization and morphology of the organic material onto thin films. Read More

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Emulating Artificial Synaptic Plasticity Characteristics from SiO-Based Conductive Bridge Memories with Pt Nanoparticles.

Micromachines (Basel) 2021 Mar 15;12(3). Epub 2021 Mar 15.

Department of Applied Physics, National Technical University of Athens, Iroon Polytechniou 9 Zografou, 15780 Athens, Greece.

The quick growth of information technology has necessitated the need for developing novel electronic devices capable of performing novel neuromorphic computations with low power consumption and a high degree of accuracy. In order to achieve this goal, it is of vital importance to devise artificial neural networks with inherent capabilities of emulating various synaptic properties that play a key role in the learning procedures. Along these lines, we report here the direct impact of a dense layer of Pt nanoparticles that plays the role of the bottom electrode, on the manifestation of the bipolar switching effect within SiO-based conductive bridge memories. Read More

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Hamlet's augury: how to manage discontinuation of mood stabilizers in bipolar disorder.

Ther Adv Psychopharmacol 2021 15;11:20451253211000612. Epub 2021 Mar 15.

Department of Psychological Medicine, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK.

Research has generated good quality evidence about the treatment and management of bipolar disorder in acute and, to some degree, sub-acute/continuation phases. This has informed various guidelines about the treatment and management of bipolar disorder (BD). However, for the long-term or maintenance phase of illness, most guidelines peter out and, in the absence of sufficiently high-quality research evidence, remain vague. Read More

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First manic/hypomanic episode in obsessive-compulsive disorder patients treated with antidepressants: A systematic review.

J Psychiatr Res 2021 May 27;137:319-327. Epub 2021 Feb 27.

Department of Psychiatry, Bellvitge University Hospital, Bellvitge Biomedical Research Institute-IDIBELL, L'Hospitalet de Llobregat, Barcelona, Spain; Centro de Investigación Biomédica en Red de Salud Mental (CIBERSAM), Barcelona, Spain; Department of Clinical Sciences, Bellvitge Campus, University of Barcelona, Spain. Electronic address:

High doses of antidepressants, particularly clomipramine and selective serotonin reuptake inhibitors (SSRIs), are the well-established treatment for obsessive-compulsive disorder (OCD), but manic/hypomanic episodes are potential adverse events associated with this treatment. A systematic literature review was performed on manic/hypomanic episodes in non-bipolar OCD patients. Clinical, sociodemographic and antidepressant characteristics during the manic/hypomanic switch were extracted using descriptive statistics. Read More

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Electrically programmable magnetoresistance in [Formula: see text]-based magnetic tunnel junctions.

Sci Rep 2021 Mar 16;11(1):6027. Epub 2021 Mar 16.

Department of Physics, National Taiwan University, Taipei, 10617, Taiwan.

We report spin-dependent transport properties and I-V hysteresis characteristics in an [Formula: see text]-based magnetic tunnel junction (MTJ). The bipolar resistive switching and the magnetoresistances measured at high resistance state (HRS) and low resistance state (LRS) yield four distinctive resistive states in a single device. The temperature dependence of resistance at LRS suggests that the resistive switching is not triggered by the metal filaments within the [Formula: see text] layer. Read More

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Electroencephalographic Microstates in Schizophrenia and Bipolar Disorder.

Front Psychiatry 2021 26;12:638722. Epub 2021 Feb 26.

Department of Psychiatry, National Clinical Research Center for Mental Disorders, The Second Xiangya Hospital of Central South University, Changsha, China.

Schizophrenia (SCH) and bipolar disorder (BD) are characterized by many types of symptoms, damaged cognitive function, and abnormal brain connections. The microstates are considered to be the cornerstones of the mental states shown in EEG data. In our study, we investigated the use of microstates as biomarkers to distinguish patients with bipolar disorder from those with schizophrenia by analyzing EEG data measured in an eyes-closed resting state. Read More

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February 2021

Bipolar Resistive Switching in Junctions of Gallium Oxide and p-type Silicon.

Nano Lett 2021 Mar 10;21(6):2666-2674. Epub 2021 Mar 10.

Department of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, Alberta T6G 2G2, Canada.

In this work, native GaO is positioned between bulk gallium and degenerately doped p-type silicon (p-Si) to form Ga/GaO/SiO/p-Si junctions. These junctions show memristive behavior, exhibiting large current-voltage hysteresis. When cycled between -2. Read More

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A surrogate measure for patient reported symptom remission in administrative data.

BMC Psychiatry 2021 03 4;21(1):121. Epub 2021 Mar 4.

Dauten Family Center for Bipolar Treatment Innovation, Department of Psychiatry, Massachusetts General Hospital, Boston, MA, USA.

Background: In real-world pragmatic administrative databases, patient reported remission is often missing.

Objective: We evaluate if, in administrative data, five features of antidepressant use patterns can replace patient-reported symptom remission.

Method: We re-examined data from Sequence Treatment Alternatives to Relieve Depression (STAR*D) study. Read More

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Bipolar radiofrequency ablation treatment of liver cancer employing monopolar needles: A comprehensive investigation on the efficacy of time-based switching.

Comput Biol Med 2021 Apr 16;131:104273. Epub 2021 Feb 16.

School of Engineering and Information Technology, Faculty of Science and Technology, Federation University, VIC, 3350, Australia.

Radiofrequency ablation (RFA) is a thermal ablative treatment method that is commonly used to treat liver cancer. However, the thermal coagulation zone generated using the conventional RFA system can only successfully treat tumours up to 3 cm in diameter. Switching bipolar RFA has been proposed as a way to increase the thermal coagulation zone. Read More

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Real-World Patterns of Utilization and Costs Associated with Second-Generation Oral Antipsychotic Medication for the Treatment of Bipolar Disorder: A Literature Review.

Neuropsychiatr Dis Treat 2021 16;17:515-531. Epub 2021 Feb 16.

Department of Psychiatry and Behavioral Sciences, University of New Mexico, Albuquerque, NM, USA.

Objective: Treatment with second-generation antipsychotics (SGAs) for bipolar disorder, including bipolar I disorder (BD-I), is common. This review evaluated real-world utilization patterns with oral SGAs in the United States (US) for bipolar disorder (and BD-I specifically when reported) and economic burden associated with these patterns.

Methods: Structured, systematic searches of MEDLINE, EMBASE, and National Health Service Economic Evaluation Database identified primary research studies (published 2008-2018) describing real-world SGA use in adults with bipolar disorder/BD-I. Read More

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February 2021

Does Switching Antipsychotics Ameliorate Weight Gain in Patients With Severe Mental Illness? A Systematic Review and Meta-analysis.

Schizophr Bull 2021 Feb 6. Epub 2021 Feb 6.

Department of Pharmacy, Redlands Hospital, Cleveland, QLD, Australia.

Objective: Obesity and adverse metabolic outcomes in patients with severe mental illness are clinically significant but potentially preventable. Importantly, the evidence for switching to antipsychotics to reduce cardiometabolic burden is unclear.

Method: PubMED, Embase, PsycINFO, and Cochrane were searched from inception to March 8, 2020. Read More

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February 2021

Selective Release of Different Neurotransmitters Emulated by a p-i-n Junction Synaptic Transistor for Environment-Responsive Action Control.

Adv Mater 2021 Mar 4;33(10):e2007350. Epub 2021 Feb 4.

Institute of Photoelectronic Thin Film Devices and Technology, Key Laboratory of Optoelectronic Thin Film Devices and Technology of Tianjin, Engineering Research Center of Thin Film Photoelectronic Technology, Ministry of Education, National Institute of Advanced Materials, Nankai University, Tianjin, 300350, China.

The design of the first p-i-n junction synaptic transistor (JST) based on n-type TiO film covered with poly(methyl methacrylate) (PMMA) and with a p-type P3HT/PEO nanowire (NW) on top. Except for basic synaptic functions that can be realized by a single neurotransmitter, the electronic device emulates the multiplexed neurotransmission of different neurotransmissions, i.e. Read More

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Fabrication and investigation of quaternary Ag-In-Zn-S quantum dots-based memristors with ultralow power and multiple resistive switching behaviors.

Nanotechnology 2021 May;32(19):195205

College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, People's Republic of China.

Quaternary Ag-In-Zn-S (AIZS) quantum dots (QDs) play critical roles in various applications since they have advantages of combining superior optical and electrical features, such as tunable fluorescence emission and high carrier mobilities. However, the application of semiconductor AIZS QDs in brain-inspired devices (e.g. Read More

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Stable and Multilevel Data Storage Resistive Switching of Organic Bulk Heterojunction.

Nanomaterials (Basel) 2021 Feb 1;11(2). Epub 2021 Feb 1.

Department of Electrical Engineering, Sejong University, 209 Neungdong-ro, Gwangjin-gu, Seoul 05006, Korea.

Organic nonvolatile memory devices have a vital role for the next generation of electrical memory units, due to their large scalability and low-cost fabrication techniques. Here, we show bipolar resistive switching based on an Ag/ZnO/P3HT-PCBM/ITO device in which P3HT-PCBM acts as an organic heterojunction with inorganic ZnO protective layer. The prepared memory device has consistent DC endurance (500 cycles), retention properties (10 s), high ON/OFF ratio (10), and environmental stability. Read More

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February 2021

Bipolar and Complementary Resistive Switching Characteristics and Neuromorphic System Simulation in a Pt/ZnO/TiN Synaptic Device.

Nanomaterials (Basel) 2021 Jan 27;11(2). Epub 2021 Jan 27.

Division of Electronics and Electrical Engineering, Dongguk University, Seoul 04620, Korea.

In this work, a ZnO-based resistive switching memory device is characterized by using simplified electrical conduction models. The conventional bipolar resistive switching and complementary resistive switching modes are accomplished by tuning the bias voltage condition. The material and chemical information of the device stack including the interfacial layer of TiON is well confirmed by transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) analysis. Read More

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January 2021

Undetectable serum lithium concentrations after coadministration of liquid lithium citrate and apple juice: A case report.

Ment Health Clin 2021 Jan 8;11(1):27-30. Epub 2021 Jan 8.

Clinical Pharmacy Specialist, Mental Health, Veterans Integrated Service Network 23 Clinical Resource Hub, Minneapolis, Minnesota.

Lithium is a mood-stabilizing medication approved by the FDA for the treatment of acute manic or mixed episodes of bipolar disorder as well as maintenance treatment. Lithium citrate is an oral solution, and the carbonate salt is available as oral capsules or extended-release tablets. A patient with a psychiatric history of PTSD and schizoaffective disorder-bipolar type, maintained on lithium and olanzapine prior to admission, was admitted to an inpatient psychiatric unit due to destabilization, paranoia, and mania. Read More

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January 2021

Solution-Processed Flexible Biomemristor Based on Gold-Decorated Chitosan.

ACS Appl Mater Interfaces 2021 Feb 21;13(4):5445-5450. Epub 2021 Jan 21.

Department of Chemical Engineering and Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 37673 Pohang, Republic of Korea.

The main requirements for skin-attachable memory devices are flexibility and biocompatibility. We represent a flexible, transparent, and biocompatible resistive switching random access memory (ReRAM) based on gold-decorated chitosan for future flexible and wearable electronics. The device with an Ag/Au-chitosan/Au cross-bar structure shows nonvolatile ReRAM properties. Read More

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February 2021

Compliance current controlled volatile and nonvolatile memory in Ag/CoFeO/Pt resistive switching device.

Nanotechnology 2021 Apr;32(18):185204

Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi-110016, India.

We report on the resistive memory effects of a Ag/CoFeO/Pt device and a deterministic conversion between volatile and nonvolatile resistive switching (RS) memory through the tuning of current compliance (I ). For the smaller I (10 A) the device exhibits volatile RS behavior with an atomically sized conducting filament showing the quantum conductance. For an intermediate I (10 A) nonvolatile bipolar RS behavior is observed, which could originate from the formation and rupture of filament consisting of Ag ions. Read More

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Management Strategies for Antipsychotic-Related Sexual Dysfunction: A Clinical Approach.

J Clin Med 2021 Jan 15;10(2). Epub 2021 Jan 15.

Barcelona Bipolar and Depressive Disorders Program, Institute of Neurosciences, University of Barcelona, IDIBAPS, CIBERSAM, Hospital Clinic of Barcelona, 08401 Catalonia, Spain.

Antipsychotic medication can be often associated with sexual dysfunction (SD). Given its intimate nature, treatment emergent sexual dysfunction (TESD) remains underestimated in clinical practice. However, psychotic patients consider sexual issues as important as first rank psychotic symptoms, and their disenchantment with TESD can lead to important patient distress and treatment drop-out. Read More

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January 2021

Memristive Switching Characteristics in Biomaterial Chitosan-Based Solid Polymer Electrolyte for Artificial Synapse.

Int J Mol Sci 2021 Jan 14;22(2). Epub 2021 Jan 14.

Department of Electronic Materials Engineering, Kwangwoon University, Chambit-kwan, B104, Nowon-gu, Seoul 01897, Korea.

This study evaluated the memristive switching characteristics of a biomaterial solid polymer electrolyte (SPE) chitosan-based memristor and confirmed its artificial synaptic behavior with analog switching. Despite the potential advantages of organic memristors for high-end electronics, the unstable multilevel states and poor reliability of organic devices must be overcome. The fabricated Ti/SPE-chitosan/Pt-structured memristor has stable bipolar resistive switching (BRS) behavior due to a cation-based electrochemical reaction between a polymeric electrolyte and metal ions and exhibits excellent endurance in 5 × 10 DC cycles. Read More

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January 2021

Modelling and Evolution of Conducting Filament in TiO Memristor Using Conducting Atomic Force Microscopy.

J Nanosci Nanotechnol 2021 Mar;21(3):1590-1597

Department of Physics, National Institute of Science and Technology, Orissa, Berhampur 761008, India.

Conducting filament evolution in TiO based resistive switching memory fabricated by simple oxidation of Ti film is investigated. Formation of titanium oxide is confirmed from the X-ray diffraction study. Forming is required to initiate the switching process. Read More

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TiC-Based MXene Oxide Nanosheets for Resistive Memory and Synaptic Learning Applications.

ACS Appl Mater Interfaces 2021 Feb 5;13(4):5216-5227. Epub 2021 Jan 5.

School of Electrical Engineering, Korea University, Anam-ro 145, Seongbuk-gu, Seoul 02841, Republic of Korea.

MXene, a new state-of-the-art two-dimensional (2D) nanomaterial, has attracted considerable interest from both industry and academia because of its excellent electrical, mechanical, and chemical properties. However, MXene-based device engineering has rarely been reported. In this study, we explored TiC MXene for digital and analog computing applications by engineering the top electrode. Read More

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February 2021

The Effect of Growth Parameters on Electrophysical and Memristive Properties of Vanadium Oxide Thin Films.

Molecules 2020 Dec 29;26(1). Epub 2020 Dec 29.

Institute of Nanotechnologies, Electronics and Electronic Equipment Engineering, Southern Federal University, 347922 Taganrog, Russia.

We have experimentally studied the influence of pulsed laser deposition parameters on the morphological and electrophysical parameters of vanadium oxide films. It is shown that an increase in the number of laser pulses from 10,000 to 60,000 and an oxygen pressure from 3 × 10 Torr to 3 × 10 Torr makes it possible to form vanadium oxide films with a thickness from 22.3 ± 4. Read More

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December 2020

Modeling and Optimization of Directly Modulated Piezoelectric Micromachined Ultrasonic Transducers.

Sensors (Basel) 2020 Dec 29;21(1). Epub 2020 Dec 29.

Electrical and Computer Engineering Department, Northeastern University, Boston, MA 02115, USA.

The present work details a novel approach to increase the transmitting sensitivity of piezoelectric micromachined ultrasonic transducer arrays and performing the direct modulation of digital information on the same device. The direct modulation system can reach 3× higher signal-to-noise ratio level and 3× higher communication range (from 6.2 cm boosted to 18. Read More

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December 2020