JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 11
·6732-6744
·
IF 4.22
You Junhua,Wang Lu,Bao Wanting,Yan Aiguo,Guo Rui
Abstract The visible-light-responsive composite photocatalyst is beneficial to improve the solar energy utilization efficiency through the coupling of narrow bandgap materials. In this work, CdS nanowires were prepared by hydrothermal method, and then BiOBr/CdS composite materials with different mass ratios were successfully prepared by a simple two-step sonography-precipitation method using CdS nanowires as a deposition template. The photocatalysts were characterized by XRD, SEM, XPS, TEM, and other methods. Rhodamine B (RhB) was used as a model pollutant to evaluate the photocatalytic activity of BiOBr/CdS catalysts with different mass ratios. The photocatalytic test results show that the composite photocatalyst containing 60% BiOBr has the highest photocatalytic activity, which indicates that it is related to the decrease in photogenerated charge recombination rate. Subsequently, the electrochemical and physical methods were used to illustrate the electron transfer mechanism and the main active center of the as-prepared samples. Free radical capture experiments reveal that holes are the main active species in the photocatalytic process of composite samples. Graphical abstract BiOBr/CdS composite photocatalyst was prepared by a simple precipitation method using dispersed one-dimensional CdS nanowires as a template. BiOBr/CdS heterostructure combined adsorption and catalysis to degrade RhB molecules more efficiently. Free radical trapping experiments reveal that holes are the main active species in the photocatalytic process of composite samples.
研究领域:
材料科学
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环境科学
·
光电催化
✓ 已验证
DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Wu Jinming,Zhang Yongqiang,Yang Shuang,Chen Zhaolai,Zhu Wei
Metal halide perovskite single-crystal detectors have attracted increasing attention due to the advantages of low noise, high sensitivity, and fast response. However, the narrow photoresponse range of widely investigated lead-based perovskite single crystals limit their application in near-infrared (NIR) detection. In this work, tin (Sn) is incorporated into methylammonium lead iodide (MAPbI3) single crystals to extend the absorption range to around 950 nm. Using a space-confined strategy, MAPb0.5Sn0.5I3 single-crystal thin films with a thickness of 15 μm is obtained, which is applied for sensitive NIR detection. The as-fabricated detectors show a responsivity of 0.514 A/W and a specific detectivity of 1.4974×1011 cmHz1/2/W under 905 nm light illumination and –1V. Moreover, the NIR detectors exhibit good operational stability (∼30000 s), which can be attributed to the low trap density and good stability of perovskite single crystals. This work demonstrates an effective way for sensitive NIR detection.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Shibing Zou,Kezhou Fan,Zidan Liu,Ligang Yuan,Qixin Yin,Jinke Bai,Jiarong Wang,Jiong Li,Min Yang,Jianwu Wei,Liqin Wu,Shuang Xu,Qifan Xue,Jiangsheng Xie,Kam Sing Wong,Jianbin Xu,Keyou Yan
The performance of the blue perovskite light-emitting diodes (PeLEDs) is limited by the low photoluminescence quantum yields (PLQYs) and the unstable emission centers. In this work, we incorporate sodium bromide and acesulfame potassium into a quasi-2D perovskite to control the dimension distribution and promote the PLQYs. Benefiting from the efficient energy cascade channel and passivation, the sky-blue PeLED has an external quantum efficiency of 9.7% and no shift of the electroluminescence center under operation voltages from 4 to 8 V. Moreover, the half lifetime of the devices reaches 325 s, 3.3 times that of control devices without additives. This work provides new insights into enhancing the performance of blue PeLEDs.
研究领域:
光电子学
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材料科学
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钙钛矿LED
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半导体器件
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Fance Ji,Xiangdong Liu,Dekun Sheng,Yuming Yang
Shape memory polymers or self-folding materials are able to achieve sophisticated three-dimensional (3D) shape-changings, but the obtained structures are usually temporary shapes. Dynamic covalent chemistry addressed this problem by realizing topological rearrangement of a polymer covalent network in solid state. In this paper, we designed a convenient strategy to achieve 3D shape-changings of thermosetting polyurethane (PU) with the aid of Near Infrared (NIR) light, including temporary and permanent shapes. A temperature gradient emerges in the PU materials upon NIR light, which results in formation of gradient plasticity in the stretched PU bilayers enabled by transcarbamoylation. After removing the external stress, various 3D shapes can be obtained as a result of asymmetrical contraction. The degree of plasticity can be adjusted by the NIR irradiation time and catalyst amounts. Besides, the plasticity region can also be strategically selected to obtain more complex permanent shapes.
研究领域:
高分子材料科学
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智能响应材料
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生物医用材料
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组织工程
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再生医学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2019
·Vol. 40
·期 5
·631-637
·
IF 4.914
Zhenmin Xu,Ru Zheng,Yao Chen,Jian Zhu,Zhenfeng Bian
Ordered mesoporous Fe/TiO 2 was prepared by an evaporation-induced self-assembly method. The iron ions were in situ embedded in the pore wall of the TiO 2 framework. The catalyst has excellent light-assisted Fenton catalytic performance under UV and visible light irradiation. X-ray diffraction and transmission electron microscopy results showed that the TiO 2 samples have an ordered two-dimensional hexagonal pore structure and an anatase phase structure with high crystallinity . The ordered pore structure of the TiO 2 photocatalyst with a large specific surface area is beneficial to mass transfer and light harvesting. Furthermore, iron ions can be controlled by embedding them into the TiO 2 framework to prevent iron ion loss and inactivation. After five cycles, the reaction rate of the ordered mesoporous Fe/TiO 2 remained unchanged, indicating that the material has stable performance and broad application prospects for the purification of environmental pollutants .
研究领域:
材料科学
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环境化学
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催化化学
·
纳米科技
·
光化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jiaxin Wu,Wenfei Ai,Kai Hou,Chaofan Zhang,Yue Long,Kai Song
Many organisms rely on a dynamic attachment mechanism to climb surfaces. Inspired by these organisms, researchers have developed soft climbing robots. Despite their rapid development in recent times, such robots have restricted application in complex environments, such as the lack of remote wireless actuation and attachment ability for climbing tilted or slippery surfaces. To address these issues, we report a light-driven dynamic adsorption/desorption soft suction cup inspired by rock-climbing fish ( Beaufortia kweichowensis ). Our suction cups utilize the volumetric change caused by changes in the gas–liquid phase in the inner chamber to generate suction and thrust. The repetitive changes in the gas–liquid phase, controlled by photothermal conversion, help achieve adsorption and desorption. We demonstrated that the suction cups based on negative pressure adsorption can easily help miniaturize soft robotic devices and adapt to multiple types of substrates, making our approach applicable to tilted or slippery surfaces. By integrating the soft suction cups for surface attachment by dynamic control and a shape memory alloy as a deformable body, we developed a soft climbing robot that can perform precise, facile, and programmed controlled climbing under different conditions via remote light manipulation. Four continuous and directional climbing sequences on tilted and slippery surfaces were demonstrated. The results are expected to help advance the application of light-driven soft robots on tilted or slippery surfaces
研究领域:
机器人学
·
仿生工程
·
智能材料
·
微纳系统
·
生物医学工程
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2024
·Vol. 12
·期 32
·2401539
·
IF 8
Qianjin Wang,Zhilin Xiang,Peizhi Yang,Yingkai Liu,Qiuhong Tan
Metal halide perovskites recently have emerged as a promising candidate for photodetection due to their exceptional photoelectric performance. However, the high dark current in these materials has hindered their practical application to imaging. In this study, a novel halogen-mixed CsPbIBr 2 microwire photodetector that has a remarkable reduction of dark current by over 100-fold (compared to CsPbBr 3 ), along with a substantial increase in photocurrent, which yields a significantly improved on/off ratio of 6.56 × 10 4 , is developed. More importantly, the halogen-mixed perovskite photodetector exhibits enhanced photodetection performance, including a high responsivity of 133 A W −1 and a remarkable specific detectivity of 4.02 × 10 12 Jones even under ultraweak light conditions as low as 4.5 nW cm −2 . More specifically, high-resolution images are successfully obtained under ultraweak light conditions. The combined analysis of experimental results and first-principles calculation attribute the excellent performance of the CsPbIBr₂ microwire photodetector to a significant reduction in dark current by suppressing ion migration and increasing carrier effective mass, and a remarkable increase in photocurrent resulting from reduced bandgap and enhanced light absorption, as compared to CsPbBr 3 . This research represents a significant advancement in the development of high-performance 1D perovskite-based photodetectors, with promising implications for ultra-weak light imaging applications.
研究领域:
光电子学
·
材料科学
·
纳米器件
·
半导体物理
·
生物医学成像
✓ 已验证
DOI
高影响因子
Zebrafish
·
2014
·
IF 1.772
Ju Wang,Changhong Liu,Fei Ma,Wei Chen,Jian Liu,Bing Hu,Lei Zheng
Zebrafish (Danio rerio) has been a widely used vertebrate animal model in developmental biology and behavioral neuroscience, but knowledge about some of its basic behaviors, for example, light/dark preference, is still controversial. Appropriate preference for light or dark environments can be crucial for an animal's survival, so we hypothesize that zebrafish may have its light/dark preference varied with the circadian clock. In this present work, we tested the hypothesis by recording the light/dark preference in a two-compartment tank continuously for over 60 h. We found that the light avoidance of fish generally increases with time from morning (8:00am) to midnight (2:00am), and then decreases with time from midnight (2:00am) to morning (8:00am), exhibiting a clear circadian-like trend in the light/dark preference. As melatonin can mediate circadian clock output and promote sleep in zebrafish, by adding extra melatonin at around 9:00am on the third day, the mean proportion of time fish spent in the dark area was increased significantly. Our results demonstrate that the circadian clock plays a significant role in regulating the light/dark preference in zebrafish, which provides valuable insights into understanding the metabolism mechanism underlying the neurobehavior, and facilitate further studies related to the neurobiology of normal and pathological behavior.
研究领域:
行为神经科学
·
时间生物学
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发育生物学
·
神经生物学
✓ 已验证
DOI
高影响因子
OPTICS COMMUNICATIONS
·
2017
·
IF 1.588
Xiaoming Cheng,Biqi Li,Bin Zhang,Qi Feng,Chengyou Lin,Yingchun Ding
Wavefront shaping is a mainstream technique of focusing light through strongly scattering media. The usage of near infrared (NIR) source in wavefront shaping attracts attentions due to its promising applications for deeply focusing light. In this paper, we experimentally demonstrate that the light at 1550 nm wavelength focus through a strongly scattering media (ZnO) by controlling DMD and using genetic algorithm (GA). As deep as 456 μ m focusing depth is realized when focusing 1550 nm light through a ZnO layer. In addition, focusing one or multiple spots in arbitrary positions through a ZnO layer is also achieved by using 1550 nm light.
研究领域:
光学
·
光子学
·
生物医学成像
·
波前工程
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2024
·
IF 2.7
Fengxia Yang,Zhilu Zhang,Zhengjun Luo,Xiaofei Dong,Lin Ge,Yan Li
Developing memristors with both light-regulated resistive switching characteristic and optronic synaptic behavior is of great significance for next-generation artificial visual applications. Herein, Cu 2 ZnSn(S,Se) 4 (CZTSSe)-based synaptic memristor is designed and its visible light-modulated resistive switching characteristics, especially the photonic synaptic behaviors, are detailedly investigated. For such Ag/CZTSSe/Mo memristor, not only its Set/Reset switching voltage and R HRS /R LRS ratio can be well regulated by visible light, either the wavelength (470 ∼ 655 nm) or intensity (40 ∼ 110 mW/cm 2 ), but also its photonic synaptic behavior like “learning-forgetting” can be achieved and modulated by light stimuli. The results are of significance for designing artificial photonic synaptic devices in neuromorphic vision application.
研究领域:
神经形态工程
·
光电子学
·
忆阻器件
·
人工突触
✓ 已验证
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2019
·Vol. 33
·期 4
·e4648
·
IF 3.259
Zi-Feng Yao,Zhen-Xiang Dai,Zhan-Jun Zhang,Gan-Hong Zheng,Xin Xu
Mn-doped SrMoO 4 nanocrystals were synthesized by thermal decomposition of metal–organic salt in an organic solvent with the doping content in the range 0–12 mol%. The structures, morphologies and optical properties were characterized using various techniques. The results suggest that Mo sites in the SrMoO 4 lattice are substituted by the Mn dopant, the adsorption bands are found to be shifted toward the visible light region and the band gap becomes narrower correspondingly. The photocatalytic performance of the as-synthesized product was determined using the degradation of methylene blue by visible light irradiation. The photocatalytic performance is enhanced with Mn doping, and the optimal degradation rate is 85% in 140 min for 5 mol% Mn doping. The enhanced photocatalytic activity with Mn doping may be ascribed to the energy band adjustment and effective photogenerated electron–hole separation caused by the Mn doping. A possible photocatalytic mechanism is also discussed.
研究领域:
材料科学
·
光催化
·
纳米技术
·
环境化学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 9
·2102496
·
IF 10.05
Huanxin Yang,Weiren Zhao,Enhai Song,Kaige Hu,Hongshi Zhang,Rui Yun,Hao Huang,Jiyou Zhong,Yang Li,Xiyan Li
Persistent phosphor, as an eco-friendly energy storage material, usually needs high-energy photonic rays in the storage process, such as ultraviolet (UV) light, X-ray, or even γ-ray. This strict requirement for light source which is harmful to human health greatly limits the popularity of persistent phosphors in the daily life. Here, a novel broadband orange persistent emissive phosphor LiGaO 2 :1%Mn 2+ (LGOM) is reported which supports efficient wide band excitation from UV to green light. The afterglow excited by 470 nm light even reaches ≈80% as intensity as UV excitation. The afterglow of LGOM excited by common blue lamp (450–460 nm) can be pictured by the smart phones for more than 48 h. The mechanism of visible light storage is discussed through the thermal-luminescence measurements. In addition, interestingly, its persistent emissive color can shift from orange-yellow to orange-red after ceasing the excitation source. This unique broadband orange afterglow phosphor which supports efficient wide range visible-light excitation, afterglow color shift, and long-lasting luminescence is expected to have potential applications in the fields of emergency direction, anticounterfeiting, decoration design, etc.
研究领域:
材料科学
·
光子学
·
发光材料
·
能量存储
·
固态化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）