共查询到20条相似文献,搜索用时 9 毫秒
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Low‐Noise and Large‐Linear‐Dynamic‐Range Photodetectors Based on Hybrid‐Perovskite Thin‐Single‐Crystals 下载免费PDF全文
Chunxiong Bao Zhaolai Chen Yanjun Fang Haotong Wei Yehao Deng Xun Xiao Lingliang Li Jinsong Huang 《Advanced materials (Deerfield Beach, Fla.)》2017,29(39)
Organic–inorganic halide perovskites are promising photodetector materials due to their strong absorption, large carrier mobility, and easily tunable bandgap. Up to now, perovskite photodetectors are mainly based on polycrystalline thin films, which have some undesired properties such as large defective grain boundaries hindering the further improvement of the detector performance. Here, perovskite thin‐single‐crystal (TSC) photodetectors are fabricated with a vertical p–i–n structure. Due to the absence of grain‐boundaries, the trap densities of TSCs are 10–100 folds lower than that of polycrystalline thin films. The photodetectors based on CH3NH3PbBr3 and CH3NH3PbI3 TSCs show low noise of 1–2 fA Hz?1/2, yielding a high specific detectivity of 1.5 × 1013 cm Hz1/2 W?1. The absence of grain boundaries reduces charge recombination and enables a linear response under strong light, superior to polycrystalline photodetectors. The CH3NH3PbBr3 photodetectors show a linear response to green light from 0.35 pW cm?2 to 2.1 W cm?2, corresponding to a linear dynamic range of 256 dB. 相似文献
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Bimetal‐Organic‐Framework Derivation of Ball‐Cactus‐Like Ni‐Sn‐P@C‐CNT as Long‐Cycle Anode for Lithium Ion Battery 下载免费PDF全文
Ruoling Dai Weiwei Sun Li‐Ping Lv Minghong Wu Hao Liu Guoxiu Wang Yong Wang 《Small (Weinheim an der Bergstrasse, Germany)》2017,13(27)
Metal phosphides are a new class of potential high‐capacity anodes for lithium ion batteries, but their short cycle life is the critical problem to hinder its practical application. A unique ball‐cactus‐like microsphere of carbon coated NiP2/Ni3Sn4 with deep‐rooted carbon nanotubes (Ni‐Sn‐P@C‐CNT) is demonstrated in this work to solve this problem. Bimetal‐organic‐frameworks (BMOFs, Ni‐Sn‐BTC, BTC refers to 1,3,5‐benzenetricarboxylic acid) are formed by a two‐step uniform microwave‐assisted irradiation approach and used as the precursor to grow Ni‐Sn@C‐CNT, Ni‐Sn‐P@C‐CNT, yolk–shell Ni‐Sn@C, and Ni‐Sn‐P@C. The uniform carbon overlayer is formed by the decomposition of organic ligands from MOFs and small CNTs are deeply rooted in Ni‐Sn‐P@C microsphere due to the in situ catalysis effect of Ni‐Sn. Among these potential anode materials, the Ni‐Sn‐P@C‐CNT is found to be a promising anode with best electrochemical properties. It exhibits a large reversible capacity of 704 mA h g?1 after 200 cycles at 100 mA g?1 and excellent high‐rate cycling performance (a stable capacity of 504 mA h g?1 retained after 800 cycles at 1 A g?1). These good electrochemical properties are mainly ascribed to the unique 3D mesoporous structure design along with dual active components showing synergistic electrochemical activity within different voltage windows. 相似文献
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Biodegradable‐Polymer‐Blend‐Based Surgical Sealant with Body‐Temperature‐Mediated Adhesion 下载免费PDF全文
Adam M. Behrens Nora G. Lee Brendan J. Casey Priya Srinivasan Michael J. Sikorski John L. Daristotle Anthony D. Sandler Peter Kofinas 《Advanced materials (Deerfield Beach, Fla.)》2015,27(48):8056-8061
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A Dual‐Organic‐Transistor‐Based Tactile‐Perception System with Signal‐Processing Functionality 下载免费PDF全文
Yaping Zang Hongguang Shen Dazhen Huang Chong‐An Di Daoben Zhu 《Advanced materials (Deerfield Beach, Fla.)》2017,29(18)
Organic‐device‐based tactile‐perception systems can open up new opportunities for the next generation of intelligent products. To meet the critical requirements of artificial perception systems, the efficient construction of organic smart elements with integrated sensing and signal processing functionalities is highly desired, but remains a challenge. This study presents a dual‐organic‐transistor‐based tactile‐perception element (DOT‐TPE) with biomimetic functionality by the construction of organic synaptic transistors with integrated sensing transistors. The unique geometry of the DOT‐TPE permits instantaneous sensing of pressure stimuli and synapse‐like processing of an electric signal in a single element. More importantly, these organic‐transistor‐based tactile‐perception elements can be built into arrays to serve as bionic tactile‐perception systems. The combined biomimetic functionality of tactile‐perception systems, together with their promising features of flexibility and large‐area fabrication, makes this work represent a step forward toward novel e‐skin devices for artificial intelligence. 相似文献
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Xiaokang Deng Yukun Ren Likai Hou Weiyu Liu Tianyi Jiang Hongyuan Jiang 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(42)
The separate co‐encapsulation and selective controlled release of multiple encapsulants in a predetermined sequence has potentially important applications for drug delivery and tissue engineering. However, the selective controlled release of distinct contents upon one triggering event for most existing microcarriers still remains challenging. Here, novel microfluidic fabrication of compound‐droplet‐pairs‐filled hydrogel microfibers (C‐Fibers) is presented for two‐step selective controlled release under AC electric field. The parallel arranged compound droplets enable the separate co‐encapsulation of distinct contents in a single microfiber, and the release sequence is guaranteed by the discrepancy of the shell thickness or core conductivity of the encapsulated droplets. This is demonstrated by using a high‐frequency electric field to trigger the first burst release of droplets with higher conductivity or thinner shell, followed by the second release of the other droplets under low‐frequency electric field. The reported C‐Fibers provide novel multidelivery system for a wide range of applications that require controlled release of multiple ingredients in a prescribed sequence. 相似文献