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排序方式: 共有133条查询结果,搜索用时 31 毫秒
21.
Polarized Optoelectronics of CsPbX3 (X = Cl,Br, I) Perovskite Nanoplates with Tunable Size and Thickness
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Xuexi Sheng Gaoyu Chen Chong Wang Weiqi Wang Junfeng Hui Qi Zhang Kehan Yu Wei Wei Mingdong Yi Mian Zhang Yu Deng Peng Wang Xiangxing Xu Zhihui Dai Jianchun Bao Xun Wang 《Advanced functional materials》2018,28(19)
Low dimensional semiconductor nanomaterials have shown their tailorable properties for a variety of promising applications in decades. Here a general strategy to synthesize all‐inorganic CsPbX3 (X = Cl, Br, I or their mixture) perovskite 2D nanoplates by introducing additional metal halides MX'2 or MX'3 (M = Cu, Zn, Al or Pb, etc.; X' = Cl, Br or I) is reported. These CsPbX3 perovskite nanoplates have uniform thickness and tunable size, which can be feasibly controlled by the component and ratio of the metal halides, temperature, time, and ligands. The well‐defined morphology of the nanoplates makes them ideal building blocks for the self‐assembly in the face‐to‐face and column‐by‐column arrangement. Compared to the optically isotropic CsPbX3 nanocubes, the 2D CsPbX3 nanoplates exhibit remarkable polarized UV–vis absorption and photoluminescence not only in liquid solvent and solid resin matrix, but also in self‐assembled films. An optoelectronic photodetector sensitive for linear polarized light is fabricated to demonstrate the proof‐of‐concept. 相似文献
22.
Construction of WS2 triangular nanoplates array for hydrogen evolution reaction over a wide pH range
《International Journal of Hydrogen Energy》2020,45(4):2909-2916
As a classic transition metal dichalcogenide, WS2 has been synthesized by a variety of methods towards different applications. However, few of them are vertically grown self-templated structures, besides, all the reported WS2 for hydrogen evolution reaction (HER) are in acidic media. Herein, we use a simple method to synthesize a new morphological WS2 triangular nanoplates array through the sulfuration of hydrothermally obtained WO3 nanowires on carbon cloth (WS2TN/CC). The WS2TNs are equilateral triangle with large surface area that grown vertically on carbon fiber. The WS2TN/CC exhibits good catalytic activity and stability as electrocatalyst for HER in acidic media and firstly in both neutral and alkaline media. The overpotential of 196, 150 and 193 mV are needed to afford current density of 10 mA cm−2 in acidic, neutral and alkaline media, respectively. 相似文献
23.
Synthesis of 2D Layered BiI3 Nanoplates,BiI3/WSe2van der Waals Heterostructures and Their Electronic,Optoelectronic Properties
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Jia Li Xun Guan Chen Wang Hung‐Chieh Cheng Ruoqi Ai Kangkang Yao Peng Chen Zhengwei Zhang Xidong Duan Xiangfeng Duan 《Small (Weinheim an der Bergstrasse, Germany)》2017,13(38)
Two–dimensional layered materials (2DLMs) have attracted considerable recent interest as a new material platform for fundamental materials science and potential new technologies. Here we report the growth of layered metal halide materials and their optoelectronic properties. BiI3 nanoplates can be readily grown on SiO2/Si substrates with a hexagonal geometry, with a thickness in the range of 10–120 nm and a lateral dimension of 3–10 µm. Transmission electron microscopy and electron diffraction studies demonstrate that the individual nanoplates are high quality single crystals. Micro‐Raman studies show characteristic A g band at ≈115 cm?1 with slight red‐shift with decreasing thickness, and micro‐photoluminescence studies show uniform emission around 690 nm with blue‐shift with decreasing thickness. Electrical transport studies of individual nanoplates show n‐type semiconductor characteristics with clear photoresponse. Further, the BiI3 can be readily grown on other 2DLMs (e.g., WSe2) to form van der Waals heterostructures. Electrical transport measurements of BiI3/WSe2 vertical heterojunctions demonstrate p–n diode characteristics with gate‐tunable rectification behavior and distinct photovoltaic effect. The synthesis of the BiI3 nanoplates can expand the library of 2DLMs and enable a wider range of van der Waals heterostructures. 相似文献
24.
Jia Li Bei Zhao Peng Chen Ruixia Wu Bo Li Qinglin Xia Guanghua Guo Jun Luo Ketao Zang Zhengwei Zhang Huifang Ma Guangzhuang Sun Xidong Duan Xiangfeng Duan 《Advanced materials (Deerfield Beach, Fla.)》2018,30(36)
Two‐dimensional materials with intrinsic magnetism have recently drawn intense interest for both the fundamental studies and potential technological applications. However, the studies to date have been largely limited to mechanically exfoliated materials. Herein, an atmospheric pressure chemical vapor deposition route to ultrathin group VB metal telluride MTe2 (M = V, Nb, Ta) nanoplates with thickness as thin as 3 nm is reported. It is shown that the resulting nanoplates can be systematically evolved from mostly thicker hexagonal domains to thinner triangular domains with an increasing flow rate of the carrier gas. X‐ray diffraction and transmission electron microscopy studies reveal MTe2 (M = V, Nb, Ta) nanoplates are high‐quality single crystals. High‐resolution scanning transmission electron microscope imaging reveals the VTe2 and NbTe2 nanoplates adopt the hexagonal 1T phase and the TaTe2 nanoplates show a monoclinic distorted 1T phase. Electronic transport studies show that MTe2 single crystals exhibit metallic behavior. Magnetic measurements show that VTe2 and NbTe2 exhibit ferromagnetism and TaTe2 shows paramagnetic behavior. The preparation of ultrathin few‐layered MTe2 nanoplates will open up exciting opportunities for the burgeoning field of spintronics, sensors, and magneto‐optoelectronics. 相似文献
25.
In this work, analytical solutions are presented for the wave propagation in functionally graded (FG) nanoplates using a nonlocal strain gradient theory and four-variable refined plate theory considering the magnetic field. The size effects are included using nonlocal strain gradient theory that has two length scale parameters, and the nanoplate is modeled as a plate using four-variable refined plate theory. From the knowledge of authors, it is the first time that the influences of magnetic field on the wave propagation in FG nanoplates are investigated based on present methodology. 相似文献
26.
Misbah Ullah Khan Hongjun You Xiaotong Liu Lingling Zhang Jixiang Fang 《Small (Weinheim an der Bergstrasse, Germany)》2018,14(8)
Precisely engineering the decoration of metal nanoparticles on the special surface of semiconductor represents a promising strategy to design efficient metal–semiconductor heterostructured photocatalysts. This study demonstrates a versatile soft‐template method to fabricate a novel nonsymmetrical heterostructured Ag/AgI nanoplate, in which only one side surface of the nanoplate is covered with uniform 2D Ag nanoweb. Compared with symmetrical heterostructure, the nonsymmetrical heterostructure may further facilitate the separation of photogenerated electron–hole pairs and shows a greatly enhanced photocatalytic activity. This study may open up a new way to improve the photocatalytic property by synthesizing nonsymmetrical metal–semiconductor composites. 相似文献
27.
Solution‐Growth Strategy for Large‐Scale “CuGaO2 Nanoplate/ZnS Microsphere” Heterostructure Arrays with Enhanced UV Adsorption and Optoelectronic Properties
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Yanmei Li Yun Song Yingchang Jiang Mingxiang Hu Zhichang Pan Xiaojie Xu Hongyu Chen Yuesheng Li Linfeng Hu Xiaosheng Fang 《Advanced functional materials》2017,27(23)
Intrinsically p‐type conductivity and a wide bandgap of ≈3.6 V endow inorganic delafossite CuGaO2 with great promise for fabricating high‐performance UV photodetectors. Nevertheless, CuGaO2‐based optoelectronic devices hindered because the intrinsic direct transitions are symmetry forbidden in CuGaO2. This study reports a large‐area synthesis of “CuGaO2 nanoplate/ZnS microsphere” heterostructure arrays using a facile solution‐based strategy associated with an oil/water interfacial self‐assembly approach. It is found that a large number of ZnS microspheres with a polycrystalline structure grow on the top surface of CuGaO2 hexagonal platelets through Ostwald ripening mechanism, forming high‐density p–n heterojunctions. A parabolic dependence between the size of ZnS microsphere and the growth time is confirmed in this growth. The UV light adsorption of the heterostructure CuGaO2/ZnS thin film is two times higher than that of the pristine CuGaO2 thin film. Furthermore, the as‐designed “CuGaO2 nanoplate/ZnS microsphere” heterostructure arrays exhibit enhanced photoresponse properties. This work offers a new insight into the rational design of optoelectronic devices from the synergetic effect of p‐type 2D nanoplates as well as n‐type nanostructures such as ZnS, ZnO, CdS, and CdO. 相似文献
28.
Nandho Rahmansyah Chieh‐Tsung Lo Ciou‐Mei Syu Chien‐Liang Lee 《Polymer International》2011,60(9):1380-1389
The non‐isothermal crystallization of poly(ethylene oxide) (PEO)/silver nanoplate composites was studied using differential scanning calorimetry. The non‐isothermal crystallization was analyzed by combining the Avrami and Ozawa equations. It was found that the Avrami exponent for neat PEO ranges from 2.51 to 2.53, whereas it ranges from 2.54 to 3.16 for its composites, indicating that the spherical crystal morphology does not change with the addition of nanoplates. However, the rate determination of crystal growth transfers from diffusion to nucleation. The crystallization half‐time showed an increase with the addition of silver nanoplates in PEO, indicating that the overall crystallization rate of PEO decreases with the addition of nanoplates. However, the nucleation activity is larger than unity in the composites and the value increases with an increase in the nanoplate content. This behavior implies that the nanoplates act as anti‐nucleating agents to hinder nucleation. Copyright © 2011 Society of Chemical Industry 相似文献
29.
Plate-like ZnO with good crystallinity were prepared by a simple hydrothermal synthesis method in Zn(NO3)2·6H2O and NaOH solution at 180 °C. The dimension of ZnO powder ranged from 200 to 500 nm and the average thickness was about 50 nm. The electrochemical performances of ZnO nanoplates as anode active materials for Ni/Zn cells were investigated by galvanostatic charge/discharge cycling and cyclic voltammogram (CV). The ZnO nanoplates showed better cycle stability than the conventional ZnO, and the discharge capacity maintained 420 mAh g−1 throughout 80 cycling tests. At the same time, they also exhibited higher midpoint discharge voltage and lower midpoint charge voltage. The continual SEM examinations on the electrode found that the morphology of the plate-like ZnO active material did not change essentially and the zinc dendrite was suppressed effectively, which resulted in the improvement of cycle stability of Ni/Zn secondary cells. 相似文献
30.
《International Journal of Hydrogen Energy》2020,45(1):412-423
Transition metal phosphides (TMPs) have been proven to be a high-performance non-noble metal electrocatalyst with high activity and nearly ~100% Faraday efficiency. However, their applications remain faces great challenging due to its unsatisfactory exposure to catalytic active sites and electronic conductivity. Here, powder sintering was used to prepare Ni–P-Multi-walled carbon nanotubes (Ni–P-MWCNTs) composite electrodes with a hierarchical flower-like structure with a large surface area, the composite electrodes were synthesized by phosphating mixed powder (porous nickel powder, red phosphorus and MWCNTs). Due to the flower-like nanoplate hierarchical structure, the fast vectorial electron transfer along the building block nanoplates was effectively induced and active sites were highly exposed. The resulting NixP-43 wt%MWCNTs shows high activity and durability towards the Hydrogen evolution reaction (HER) under acidic conditions. It demands extremely low onset-potential of 29 mV, 96 mV to achieve a current density of 10 mA cm−2. This work suggests an effective method to facilitate grain preferred orientation growth and exposure high activity active, experimental results demonstrate that the electrocatalytic performance of as-prepared Ni–P-MWCNTs were successfully optimized through the addition of MWCNTs, and might promote further study of the TMPs catalysts for HER. 相似文献