APPLIED SURFACE SCIENCE
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2023
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IF 6.7
Fei Xue,Wei He,Jihui Wang,Wenbin Hu
Al x Zn 1- x O films were prepared on SS304 by using sol–gel method combined with spinning and heat treatment. The surface morphology, composition and structure of films were observed and characterized by scanning electron microscopy, X-ray diffractometer and Fourier transform infrared spectroscopy. The oxygen vacancy content and semiconductor type of Al x Zn 1- x O films were determined by X-ray photoelectron spectroscopy, electronic para -magnetic resonance spectroscopy, Mott-Schottky curve and density function theoretical calculation. The corrosion resistance and resistive switching performance of Al x Zn 1- x O films were measured by using electrochemical methods and immersion-polarisation experiments. The results show that the prepared Al x Zn 1- x O films are in n -type semiconductor material with a homogeneous and dense surface, the oxygen vacancy content is decreased with the increasing of Al dopping content. The corrosive resistance of Al x Zn 1- x O film was increased with the increasing of Al doping content with the best corrosion resistance at the doping content of 4% Al. During the immersion process, the corrosion resistance of Al x Zn 1- x O film was firstly increased and then decreased. The corrosion resistance of Al x Zn 1- x O films could be switched in the high and low resistance states under the immersion-polarization process by adjusting of the oxygen vacancy content in film.
研究领域:
材料科学
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电化学
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表面工程
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2024
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IF 18.5
Jiang Feng,Jiaming Fan,Zijian Zhang,Yu Gao,Song Xue,Gangri Cai,Jin Shi Zhao
2D materials have garnered significant attention owing to their substantial potential across various applications, including thin-film electronics, optoelectronics, and sensor devices, particularly, the synthesis and deposition methods of the 2D materials are crucial. In this study, thin films of tin disulfide (SnS 2 ), a layer-structured metal dichalcogenide, are deposited on an indium tin oxide (ITO) glass substrate through a spin-coating process to prepare a sandwich-structured resistive switching (RS) device (ITO/SnS 2 /ITO) by following magnetron sputtering of ITO as top electrode. Notably, the solution-phased spin-coating deposition method provides an efficient approach to enhance device performance through ion doping. By incorporating calcium ions (Ca 2+ ), the devices exhibit the potential to achieve outstanding resistive switching performance and synapse functionality. With a DC sweep, an on/off resistance ratio exceeding 100 can be sustained without degradation for up to 5000 cycles. Furthermore, the devices exhibit diverse synaptic functions, including short-term and long-term plasticity (STP, LTP) in both potentiation and depression processes, spike-timing-dependent plasticity (STDP), and paired-pulse facilitation (PPF). The transition in electrical resistance and synaptic function can be attributed to the migration of doped Ca 2+ along the grain boundary and interlayer space of layer-structured SnS 2 films.
研究领域:
材料科学
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神经形态计算
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电子器件
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纳米技术
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产品关联
DOI
高影响因子
OPTICAL MATERIALS
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2022
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IF 3.754
Zemin He,Ping Yu,Jianjing Gao,Cheng Ma,Xueyan Feng,Huimin Zhang,Yuzhen Zhao,Zongcheng Miao
In this study, an effective method was demonstrated to improve the performance of polymer dispersed liquid crystal (PDLC) films by incorporating nano-sized polyhedral oligomeric silsesquioxane (POSS) particles into the polymer matrix . The thiol-functionalized POSS dispersed uniformly in the polymer phase by participating in the crosslinking reaction of epoxy and thiol monomers. Consequently, low driving voltages within the safety range were achieved by introducing POSS in percentage of 6 wt%, due to the combined effects of regulating the polymer morphology and lowering the surface energy. Moreover, the contrast ratio was improved to be higher than 300. Stability and switchability were also verified in on-off cycles, indicating its lifetime of as least 50000 cycles. In addition, the epoxy and thiol material system contributed to the outstanding mechanical strength , which could help maintain the electro-optical properties even in flexible films. This work could provide an effective approach for the optimization of PDLC films and promote their potential applications in fields such as flexible displays and smart windows.
研究领域:
材料科学
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聚合物科学
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光电子学
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显示技术
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Ming-Hin Chau,Marc C.A. Stuart,Franco King-Chi Leung
Photoresponsive amphiphiles are functionalised with photoactivating units, enabling dynamic controls of hierarchical supramolecular systems with a non-invasive photo-stimulation. Limited visible-light driven photoresponsive amphiphiles were developed, while biomedical applications of well-developed UV-light driven photoresponsive amphiphiles are hindered due to bio-damaging effect. Herein, we report newly designed red-light responsive N, N′ -alkyl-aryl-substituted indigo amphiphiles (IA), showing excellent photoswitchability and photostability in organic media. Upon dissolution of IA in aqueous media, supramolecular nanostructures are constructed at pH 7. Though photoresponsiveness of IA is slightly compromised, co-solvent and co-assembly of IA enable supramolecular transformations from vesicle to irregular aggregate in aqueous media. Through investigation of the photoisomerisation and supramolecular transformation processes, this work could provide as a new strategy towards the development of red-light controlled biomedical soft functional materials .
研究领域:
材料科学
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生物医学工程
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化学
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纳米技术
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DOI
高影响因子
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