Article
Engineering, Electrical & Electronic
P. S. Subin, A. S. Asha, K. J. Saji, M. K. Jayaraj
Summary: This article presents a TiO2-based transparent artificial synaptic device that replicates almost all functionalities of a biological synapse, including potentiation, depression, long-term potentiation (LTP), and short-term plasticity (STP). Furthermore, the device demonstrates excellent paired-pulse facilitation (PPF) with varying width, interval, and amplitude of input stimuli. Additionally, it also shows spike-timing-dependent plasticity (STDP), a key characteristic of biological synapses.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Physical
T. A. Zepeda, R. Ponce-Perez, A. Solis-Garcia, J. Guerrero-Sanchez, S. Fuentes, S. A. Gomez
Summary: This study reports on the effective oxygen activation in CeO2 by gallium incorporation, with varying Ga/Ce molar ratios. It was found that gallium incorporation improves the oxygen activation in CeO2, with higher effectiveness at low gallium content (Ga/Ce of 0.25).
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Physical
Pedro Castro-Fernandez, Deni Mance, Chong Liu, Paula M. Abdala, Elena Willinger, Aurelio A. Rossinelli, Alexander I. Serykh, Evgeny A. Pidko, Christophe Coperet, Alexey Fedorov, Christoph R. Mueller
Summary: This study investigates the effect of H2 treatment on the structure, acidity, and catalytic activity of γ/β-Ga2O3 nanoparticle catalysts. The results show that the presence of the β-Ga2O3 phase increases the PDH activity of the catalysts, and H2 treatment enhances the catalytic activity for all three catalysts through different mechanisms.
JOURNAL OF CATALYSIS
(2022)
Article
Chemistry, Physical
A. Y. Polyakov, A. A. Vasilev, I. V. Shchemerov, A. V. Chernykh, I. V. Shetinin, E. V. Zhevnerov, A. I. Kochkova, P. B. Lagov, A. V. Miakonkikh, Yu. S. Pavlov, U. A. Kobets, In-Hwan Lee, A. Kuznetsov, S. J. Pearton
Summary: Lightly n-type beta-Ga2O3 grown on heavily n-type doped beta-Ga2O3 substrate was implanted with high-fluence O ions and then treated in dense hydrogen plasma. The film remained beta-polymorph and showed no broadening of the x-ray rocking curve width after irradiation. The hydrogen plasma treatment led to the formation of a conducting surface layer and the suppression of Fe acceptors, indicating a passivation effect.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Xu Dai, Xi Zhang, Gang Xiang
Summary: In this study, amorphous Mn-doped gallium oxide films with room-temperature ferromagnetism were prepared by polymer-assisted deposition. The magnetic properties of the films depend on the concentration of Mn and the enhancement of ferromagnetism comes from the strong coupling between oxygen vacancies and Mn ions.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
A. Pichorim, I. T. Neckel, A. J. A. De Oliveira, J. Varalda, D. H. Mosca
Summary: Oxygen-defective gallium oxide thin films with cubic spinel structure were prepared by adjusting the oxygen partial pressure, exhibiting ferromagnetic-like behavior at room temperature. The presence of oxygen vacancies and defects is likely the origin of the unconventional magnetic behavior. These results expand the applications of gallium oxide.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Engineering, Electrical & Electronic
Rui Xu, Xiaocui Ma, Yanhui Chen, Yang Mei, Leiying Ying, Baoping Zhang, Hao Long
Summary: In this work, beta-Ga2O3 thin films were deposited on GaN template and sapphire substrates by MOCVD. Corresponding beta-Ga2O3 thin film PDs were prepared. Oxygen vacancies were found to determine the performance differences between the two heteroepitaxial beta-Ga2O3 thin film PDs. The photoconductive model of the MSM structure was announced, highlighting the key role of oxygen vacancies in this observation. This work paved the way for further optimization of heteroepitaxial beta-Ga2O3 thin film PDs.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Chemistry, Physical
Mariia Merko, G. Wilma Busser, Martin Muhler
Summary: This study reports on the high catalytic performance of pure beta-Ga2O3 in the non-oxidative dehydrogenation of methanol to formaldehyde reaction. Higher formaldehyde selectivity can be achieved under appropriate temperature and GHSV conditions. The catalyst is affected by carbon deposits and Ga2O3 volatilization.
Article
Chemistry, Multidisciplinary
Li-Wen Wang, Chih-Wei Huang, Ke-Jing Lee, Sheng-Yuan Chu, Yeong-Her Wang
Summary: Recently, resistive random access memory (RRAM) has emerged as a promising solution for high-density storage and in-memory computing applications. However, traditional RRAM's two-state accommodation cannot meet the high density requirement in the era of big data. This study demonstrates that Al/graphene oxide (GO)/Ga2O3/ITO RRAM has the potential for achieving two-bit storage with improved electrical properties and stable reliability.
Article
Nanoscience & Nanotechnology
Wei Zhang, Jianzhang Lei, Yixian Dai, Xuehua Zhang, Limin Kang, Bowen Peng, Fangren Hu
Summary: In this study, the effect of top contact interface and microstructural characteristics of the insulating layers on resistive switching behaviors was investigated. The results show that the interfacial charge migration process plays a key role in the resistive switching process, and the electrode characteristics have a significant impact on the resistive switching performance.
Article
Chemistry, Physical
Liangqing Hu, Kening Liu, Yanming Guo, Jing Feng, Xuejiao Ding, Weixia Li, Xiaojiang Su, Mingming Gao, Zhiyong Li, Hexin Zhang, Yueming Ren, Tong Wei
Summary: In this study, RGO/WOCu composite catalysts with abundant oxygen vacancies were prepared by the hydrothermal method, which showed enhanced performance in electrochemical nitrogen reduction reaction (NRR) under ambient conditions.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Physical
F. Cordero, F. Trequattrini, D. A. B. Quiroga, P. S. Silva Jr
Summary: The diffusion and aggregation of oxygen vacancies in perovskites play important roles in material properties, and their impacts can be revealed by lowering the ferroelectric transition temperature with the introduction of oxygen vacancies in barium titanate. The anelastic relaxation processes due to oxygen vacancies may be partially hidden by the ferroelectric transition in perovskites, but can be uncovered by manipulating the material composition.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Yujeong Lee, Daseob Yoon, Sangbae Yu, Hyeji Sim, Yunkyu Park, Yeon-Seo Nam, Ki-Jeong Kim, Si-Young Choi, Youngho Kang, Junwoo Son
Summary: This paper presents a new strategy to manipulate surface defect states in oxide semiconductors by light interaction, achieving reversibility and spatial selectivity of photocurrent control.
ADVANCED MATERIALS
(2022)
Article
Environmental Sciences
Qingfeng Ma, Yongbao Chu, Xiaoyu Ni, Jingyi Zhang, Haoze Chen, Fei Xu, Yan Wang
Summary: In this study, a CeO2 modified carbon nanotube electrified membrane (CeO2@CNT membrane) was prepared for the degradation of antibiotics using NaClO. The CeO2@CNT membrane showed a higher reaction rate constant compared to the traditional carbon nanotube electrified membrane and exhibited good stability.
Article
Chemistry, Physical
Xingwen Zheng, Ying Yang, Changfeng Fang, Xiaohui Liu
Summary: We investigated the influence of work function and charge doping on the formation of oxygen vacancies in metal/oxide heterojunctions by first-principles calculations. SrTiO3 is used as a typical oxide. Simple metals Pt, Au and Ag are used as electrodes. Electron doping could improve the formation energy of oxygen vacancies. The work function of the metal electrode affects the stability of oxygen vacancies in SrTiO3, with electrodes having smaller work functions leading to improved formation energies. The effect of ferroelectric polarization in a heterojunction of metal/BaTiO3 was also studied, finding similar properties. Our work could assist in the design of complex-oxide-based electronic devices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
