JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Wen Wu,Manjing Wang,Limin Liang,Yufei Yan,Xuerong Zheng,Qiuyan Hao,Hui Liu,Jun Zhang,Caichi Liu
The length effects on photoconductivity have been observed in Sb 2 Se 3 nanorods with uniform diameter grown by a hot-injection polyol process. The phase formation and morphology evolution of Sb 2 Se 3 nanorods were investigated by XRD and TEM analysis. By changing the reaction temperature from 150 °C to 250 °C, the sizes and aspect ratios of Sb 2 Se 3 nanorods can be easily controlled, with an average length ranged from 0.6 μm to 3.2 μm. The length-controlled nanorods were directly used for fabricating prototype photodetectors to explore their length-dependence performances. A significant increase of photoresponse with length elongation has been observed, in which the optimal device displays a remarkable response to simulated solar light with a high switching “on/off” ratio of 320, short response/recovery times (0.15/0.16 s) and long-term durability. This length-dependence property on photodetectors can be considered as an important step to promote the performance of 1D Sb 2 Se 3 nanomaterials .
研究领域:
材料科学
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纳米技术
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Zhongming Wang,Kun Wang,Xiaoying Peng,Qiang Geng,Xun Chen,Wenxin Dai,Xianzhi Fu,Xuxu Wang
The photoconductivity and the gas sensing property of TiO 2 at room temperature under ultraviolet (UV) irradiation were compared with those under visible light irradiation (≥420 nm), respectively. It was found that UV light could cause the photoconductivity of TiO 2 and its sensing response to both ethylene and oxygen, while the visible light at 420 nm could cause the photoconductivity of TiO 2 and its sensing response to oxygen but not to ethylene. This indicates that the photo-assisted gas sensing performance of TiO 2 was dependent on its light-excited behavior: The intrinsic excitation of TiO 2 induced by UV light could produce both the holes and electrons, which exhibited a respective response to ethylene and oxygen, while the extrinsic excitation of TiO 2 induced by visible light maybe only produced the free electrons but not free holes, resulting in only a response to oxygen. Furthermore, it was found that the visible-light enhanced conductivity maybe depend on the Ti–bonded hydroxyls (Ti–OH) at TiO 2 surface. With the removal of Ti–OH by increasing temperature, the visible light could not produce the photoconductivity of TiO 2 . It was proposed that Ti–OH groups act as the shallow trapped level to cause the extrinsic excitation of TiO 2 .
研究领域:
材料科学
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半导体物理
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传感器技术
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光化学
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表面科学
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纳米材料
✓ 已验证
DOI
高影响因子
AIP Advances
·
2015
·Vol. 5
·期 2
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IF 1.524
Tang G. W.,Qian Q.,Peng K. L.,Wen X.,Zhou G. X.,Sun M.,Chen X. D.,Yang Z. M.
Phosphate glass-clad optical fibers containing selenium (Se) semiconductor core were fabricated using a molten core method. The cores were found to be amorphous as evidenced by X-ray diffraction and corroborated by Micro-Raman spectrum. Elemental analysis across the core/clad interface suggests that there is some diffusion of about 3 wt % oxygen in the core region. Phosphate glass-clad crystalline selenium core optical fibers were obtained by a postdrawing annealing process. A two-cm-long crystalline selenium semiconductor core optical fibers, electrically contacted to external circuitry through the fiber end facets, exhibit a three times change in conductivity between dark and illuminated states. Such crystalline selenium semiconductor core optical fibers have promising utility in optical switch and photoconductivity of optical fiber array.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
Chemistry-An Asian Journal
·
2021
·Vol. 16
·期 24
·4137-4144
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IF 4.568
Yaxin Xu,Jiarui Hu,Xinyuan Du,Xinglin Xiao,Mingkai Li,Jiang Tang,Junnian Chen,Yunbin He
Graphical A novel hybrid bismuth bromide perovskite with centimeter size and high transparency was synthesized via antisolvent-assisted crystallization, exhibiting promising X-ray detection behavior. Hybrid bismuth halides perovskites have emerged as promising candidates for X-ray detection, due to the strong absorptivity of high-energy X-ray photons, high resistivity, large carrier diffusion length and low toxicity. However, the mostly investigated hybrid bismuth iodides single crystals are usually opaque and require a harsh synthesis process. Herein, novel one-dimensional (1D) pentamethylenediamine bismuth bromide (PDA)BiBr 5 single crystals were synthesized via an antisolvent-assisted crystallization method at room temperature. Bulk (PDA)BiBr 5 single crystals have sizes of 10×1.3×1.5 mm 3 and high transparency. They are shown to have low density of defects of 2.0×10 10 cm −3 and obvious photoconductivity. Moreover, they exhibit large bulk resistivity of 2.13×10 11 Ω cm and good X-ray attenuation coefficient. Consequently, the vertical structured (PDA)BiBr 5 single crystal X-ray photoconductor produces a sensitivity of 3.8 μC Gy air −1 cm −2 . This study provides a facile strategy for synthesizing bulk hybrid bismuth bromides single crystals with potential X-ray detection application.
研究领域:
材料科学
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辐射探测技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 91
·74251-74255
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IF 3.84
Juan-Ye Wang,Hong-Dan Peng,Jia-Mei Yang,Jing-Hui Yan,Ge-Bo Pan
We develop a facile approach for the one-step growth of ultralong and high-quality NiOEP nanowires in a large area, through a solvent-induced self-assembly method without using any structure directing agents. The size of the nanowires can be controlled by changing the composites of solvent mixtures. Being assembled in visible-light sensors, these nanowires exhibit a fast, reversible, and stable response. The highest Ion/Ioff ratio and photoresponsivity of photodiodes could reach 681 and 10.1 mA W−1, respectively, which could be attributed to the perfect single crystal quality, large surface to volume ratio, and fewer recombination barriers within the nanostructures. The facile fabrication and good photoresponse make NiOEP nanowires promising in optoelectronic applications.
研究领域:
材料科学
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纳米科技
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光电子学
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物理化学
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功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2018
·
IF 2.207
Hongyu Shi,Na Li,Zhixia Sun,Tianqi Wang,Lin Xu
TiO 2 nanoparticles are commonly used as versatile precursors to make functional nanocomposite materials. However, the surface defects at grain boundaries of TiO 2 nanoparticles significantly affect the photoelectric properties of TiO 2 nanomaterials . In this work, we firstly prepared nanocomposites of TiO 2 and polyoxometalates (POMs) in which different POMs, including titanium-substituted POMs K 5 [PW 11 TiO 40 ] and K 7 [PW 10 Ti 2 O 40 ], are incorporated with TiO 2 nanoparticles so as to make an interface modification on grain boundaries of TiO 2 nanoparticles. Then the photoconductivities of the TiO 2 /POM nanocomposites were investigated through measurement of photocurrent responses, current-voltage curves, Mott-Schottky plots and surface photocurrent spectra. Compared with pure TiO 2 nanoparticles, TiO 2 /POM nanocomposites exhibit superior photoelectric properties, benefitting from the interface modification from different POMs. The gas sensing performance for acetone was also explored by use of the as-prepared photoconductive devices, and TiO 2 /PW 11 Ti exhibited a high gas sensing performance.
研究领域:
材料科学
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纳米科技
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半导体物理
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传感器技术
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光电子学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jie Li,Haifeng Liu,Hongwei Wu,Jiacheng Yang,Ting Deng,Sili Liu,Ruishi Xie,Baogang Guo,Xingquan Zhang,Kui Zheng,Jichuan Huo
In this work, LaNiO 3 epitaxial thin films on (001) single-crystal LaAlO 3 and SrTiO 3 substrates were deposited by polymer assisted deposition method, respectively. Additionally, LaNiO 3 polycrystalline film was coated on ceramic substrate using LaNiO 3 powder obtained from precursor solution in polymer assisted deposition. Due to the difference of lattice mismatch between LaNiO 3 and single-crystal substrates, LaNiO 3 thin films suffer different epitaxial strain, resulting in distortion of NiO 6 octahedrons which increases with the intensity of strain. Such phenomena lead to the decrease of the field splitting energy of NiO 6 octahedron and the band gap value of LaNiO 3 , further increasing the charge transition and enhancing the visible-light photoconductivity . The existence of epitaxial strain brings more Ni 2+ and adsorbed oxygen into perovskite type LaNiO 3 , introduces more oxygen vacancy defects, reduces the complex rate of photo induced electron-hole pairs, and thereby improves the photoelectric activity of LaNiO 3 . This work provides a feasible method to control the structure distortion and photoconductivity effect of all-inorganic perovskite.
研究领域:
材料科学
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物理学
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光电子学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·Vol. 35
·期 38
·2504250
·
IF 19
Shuwen Xin,Tianyu Wang,Kunpeng Dou,Lingyan Zheng,Liren Wu,Qi Chen,Shaohua Ji,Guanglong Ding,Ramakrishna Seeram,Ye Zhou,Fengyun Wang
Neuromorphic visual systems, integrating image information acquisition, processing, and storage, hold significant potential for applications in smart security, healthcare, and other fields. Currently, commercial human visual prosthetic systems primarily utilize Si-based CMOS logic circuits to simulate synaptic functions. Compared to traditional Si-based materials, metal oxide nanowires offer unique advantages, such as a larger specific surface area and sustained photoconductivity. However, artificial synaptic devices based on metal oxide nanowires can only achieve unidirectional photoresponse enhancement, posing challenges in mimicking hyperpolarization behavior of cone and rod cells and further developing image classification and recognition functions. Herein, an artificial photo-synaptic device with negative photoconductivity based on metal oxide nanowires/perovskite quantum dots heterojunction fabricated via low-cost electrospinning is proposed. The carrier dynamics process is investigated using advanced characterization techniques. It is revealed that the negative photoconductivity is induced by heterojunction-associated conduction carrier consumption. Based on the device array, the optical encryption function is achieved. The array with adjustable conductivity is used to develop an artificial vision system, reducing redundant data and noise while improving recognition accuracy from 51% to 99%. This study highlights the promising potential of optoelectronic synaptic devices based on metal oxide nanowires and perovskite heterojunctions for artificial visual systems.
研究领域:
神经形态工程
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光电子学
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纳米材料
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人工智能硬件
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视觉感知系统
✓ 已验证
产品关联
DOI
高影响因子
Applied Materials Today
·
2025
·
IF 6.9
Zhenyu Li,Lingling Zhang,Yafei Chen,Xueyong Zheng,Chunli Jiang,Chunhua Luo,Hechun Lin,Hui Peng
The limitations of von Neumann architectures in computational speed and energy efficiency have driven the development of neuromorphic computing systems, where optoelectronic synaptic devices play a pivotal role in enabling brain-inspired information processing. This study presents an optoelectronic synaptic device based on a two-dimensional conductive metal-organic framework material Cu-BHT which exhibits broad visible-light absorption (300 - 600 nm), high photoconductivity, and solution processability. The fabricated device with a planar structure of Ag/Cu-BHT/Ag successfully simulates the key biological synaptic functionalities, including excitatory postsynaptic current (EPSC), paired-pulse facilitation (PPF), and short-to-long-term memory transitions. The device achieves a high accuracy of 96.3% in MNIST handwritten digit recognition using a convolutional neural network (CNN). Furthermore, multi-wavelength response of the device enables optical logic operations (AND/OR) and associative learning paradigms, such as Pavlovian conditioning experiment. This work underscores Cu-BHT as a versatile material for neuromorphic computing and artificial visual systems, with future research exploring scalable fabrication and hybrid integration to realize adaptive vision platforms with enhanced energy efficiency.
研究领域:
神经形态工程
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光电子学
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材料科学
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人工智能
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神经网络
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2021
·Vol. 33
·期 52
·2104960
·
IF 30.849
Yunxia Hu,Mingjin Dai,Wei Feng,Xin Zhang,Feng Gao,Shichao Zhang,Biying Tan,Jia Zhang,Yong Shuai,YongQing Fu,PingAn Hu
Biomimetic eyes, with their excellent imaging functions such as large fields of view and low aberrations, have shown great potentials in the fields of visual prostheses and robotics. However, high power consumption and difficulties in device integration severely restrict their rapid development. In this study, an artificial synaptic device consisting of a molybdenum disulfide (MoS 2 ) film coated with an electron injection enhanced indium (In) layer is proposed to increase the channel conductivity and reduce the power consumption. This artificial synaptic device achieves an ultralow power consumption of 68.9 aJ per spike, which is several hundred times lower than those of the optical artificial synapses reported in literature. Furthermore, the multilayer and polycrystalline MoS 2 film shows persistent photoconductivity performance, effectively resulting in short-term plasticity, long-term plasticity, and their transitions between each other. A 5 × 5 In/MoS 2 synaptic device array is constructed into a hemispherical electronic retina, demonstrating its impressive image sensing and learning functions. This research provides a new methodology for effective control of artificial synaptic devices, which have great opportunities used in bionic retinas, robots, and visual prostheses.
研究领域:
神经形态电子学
·
光电子学
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仿生传感器
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低功耗器件
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柔性电子学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 9
·期 2
·508-516
·
IF 7.059
Haiguo Hu,Yonghong Zeng,Shan Gao,Rui Wang,Jinlai Zhao,Kaixi You,Yufeng Song,Quanlan Xiao,Rui Cao,Jianqing Li,Zhitao Lin,Jia Guo,Yiqing Shu,Zhinan Guo,Dianyuan Fan
Tellurene, as a typical non-layered two-dimensional (2D) material, has attracted a lot of attention due to its superior properties such as fast photoconductivity, high thermoelectricity, large piezoelectricity, and excellent nonlinear optical response. Here, a unique, simple, and rapid solution method for the synthesis of high-quality hexagonal Te nanosheets with large area has been proposed. In the presence of polyvinylpyrrolidone (PVP) as a surfactant, the raw material, i.e., tellurium sodium hydride (NaHTe) was rapidly oxidized by O2 in ethanol solution to obtain the hexagonal Te nanosheets with a size of 5–11 μm and a thickness of 50–170 nm. In addition, the experimental results demonstrated that the prepared hexagonal Te nanosheets possessed good optical absorption and exhibited good photoresponse and stability as a photoanode material in a photoelectrochemical (PEC)-type photodetector. Meanwhile, this material also showed excellent nonlinear absorption properties, and the erbium-doped fiber ring laser with the Te nanosheets as a saturated absorption material successfully achieved mode-locking operation at 1550 nm. This work provides new ideas for the preparation of hexagonal Te nanosheets and their applications in optoelectronics and ultrafast photonics.
研究领域:
材料科学
·
光电子学
·
超快光子学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）