scholarly journals Preparation of two-dimensional atomic crystal nanofilm of bismuth selenide of a large area

2020 ◽  
pp. 38-45
Author(s):  
Magauiya Esjan ◽  
B. Bekturgan ◽  
Duisek Kamysbayev ◽  
Bazarbay Serikbaev ◽  
Azimbek Kokanbaev
Keyword(s):  
Molybdenum Sulfide ◽  
Effect Of Temperature ◽  
Synthesis Process ◽  
Bismuth Selenide ◽  
Two Dimensional ◽  
Large Area ◽  
Advantages And Disadvantages ◽  
Photoelectric Properties ◽  
Metal Selenides ◽  
Atomic Crystal

A synthesis of bismuth selenide with a thickness of 3-4 nm on the surface of mica taken as a matrix was investigated using the gas-solid mechanism. Since discovery of two-dimensional atomic crystals of graphene in 2004, scientists have grown interested in exploring methods for synthesis of two-dimensional atomic crystal nanofilms. Among them, of particular interest are sulfides and transition metal selenides, such as molybdenum sulfide, tungsten selenide, bismuth selenide. Bismuth selenide possesses special thermoelectric, photoelectric properties, therefore there are wide possibilities for its use in such areas as thermoelectric devices, photosensitive elements, optical information keepers, etc. In this connection, there are many studies on the search for optimal methods for the synthesis of bismuth selenide. Each of the proposed methods has its own advantages and disadvantages. In the article, a variety of the recently used gas-liquid-solid mechanism (V-L-S) is used as a method for the synthesis of bismuth selenide. When using amorphous silicon dioxide as a matrix, the synthesized bismuth selenide is not uniform, and the synthesis process is uncontrollable. Therefore, in the work fluorinated gold mica was used as a matrix. The effect of temperature, gas feed rate on the size, shape and thickness of the film was investigated.

scholarly journals Electrochemical polymerization of poly(aniline-o-anisidine) and its anticorrosion properties

2020 ◽  
pp. 30-36
Author(s):  
Aidana Turlygaziyeva ◽  
Gulmira Rakhymbay ◽  
Yeldana Bakhytzhan ◽  
Akmaral Argimbayeva ◽  
Bibisara Burkitbayeva
Keyword(s):  
Electrochemical Polymerization ◽  
Molybdenum Sulfide ◽  
Effect Of Temperature ◽  
Synthesis Process ◽  
Bismuth Selenide ◽  
Two Dimensional ◽  
Advantages And Disadvantages ◽  
Photoelectric Properties ◽  
Metal Selenides ◽  
Atomic Crystal

A synthesis of bismuth selenide with a thickness of 3-4 nm on the surface of mica taken as a matrix was investigated using the gas-solid mechanism. Since discovery of two-dimensional atomic crystals of graphene in 2004, scientists have grown interested in exploring methods for synthesis of two-dimensional atomic crystal nanofilms. Among them, of particular interest are sulfides and transition metal selenides, such as molybdenum sulfide, tungsten selenide, bismuth selenide. Bismuth selenide possesses special thermoelectric, photoelectric properties, therefore there are wide possibilities for its use in such areas as thermoelectric devices, photosensitive elements, optical information keepers, etc. In this connection, there are many studies on the search for optimal methods for the synthesis of bismuth selenide. Each of the proposed methods has its own advantages and disadvantages. In the article, a variety of the recently used gas-liquid-solid mechanism (V-L-S) is used as a method for the synthesis of bismuth selenide. When using amorphous silicon dioxide as a matrix, the synthesized bismuth selenide is not uniform, and the synthesis process is uncontrollable. Therefore, in the work fluorinated gold mica was used as a matrix. The effect of temperature, gas feed rate on the size, shape and thickness of the film was investigated.

scholarly journals Two-Dimensional Materials in Large-Areas: Synthesis, Properties and Applications

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Ali Zavabeti ◽  
Azmira Jannat ◽  
Li Zhong ◽  
Azhar Ali Haidry ◽  
Zhengjun Yao ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Large Area ◽  
Large Crystal ◽  
High Quality ◽  
Future Technology ◽  
Advantages And Disadvantages ◽  
Grain Sizes ◽  
Two Dimensional Materials ◽  
Synthesis Properties ◽  
Synthetic Routes

AbstractLarge-area and high-quality two-dimensional crystals are the basis for the development of the next-generation electronic and optical devices. The synthesis of two-dimensional materials in wafer scales is the first critical step for future technology uptake by the industries; however, currently presented as a significant challenge. Substantial efforts have been devoted to producing atomically thin two-dimensional materials with large lateral dimensions, controllable and uniform thicknesses, large crystal domains and minimum defects. In this review, recent advances in synthetic routes to obtain high-quality two-dimensional crystals with lateral sizes exceeding a hundred micrometres are outlined. Applications of the achieved large-area two-dimensional crystals in electronics and optoelectronics are summarised, and advantages and disadvantages of each approach considering ease of the synthesis, defects, grain sizes and uniformity are discussed.

scholarly journals Large-area two-dimensional bismuth selenide crystals synthesized by solution-based control of the nucleation environment

RSC Advances ◽  
2016 ◽  
Vol 6 (108) ◽  
pp. 106960-106963 ◽  
Author(s):  
Mukul Pradhan ◽  
Intek Song ◽  
Jinho Lee ◽  
Minkyung Lee ◽  
Chibeom Park ◽  
...  
Keyword(s):  
Chelating Agents ◽  
Bismuth Selenide ◽  
Two Dimensional ◽  
Large Area ◽  
Seed Mediated

Large-area 2D Bi2Se3 crystals are grown by solution-based synthesis, where both seed-mediated growth and chelating agents are used.

Imaging Transfer Devices Operated by PSD Mode a-Si P-I-N Junctions

1989 ◽  
Vol 149 ◽  
Author(s):  
M. Yamaguchi ◽  
S. Murakami ◽  
S. Todo ◽  
Y. Tawada
Keyword(s):  
Image Sensor ◽  
Two Dimensional ◽  
Key Factors ◽  
Large Area ◽  
One Dimensional ◽  
Display Devices ◽  
Advantages And Disadvantages ◽  
Position Sensitive ◽  
Deposition Techniques

ABSTRACTTwo types of position sensitive device (PSD) using a-Si:H thin films have been developed. One has been produced by large area plasma CVD, with usual metal deposition techniques. The other is the application of a linear image sensor as a one dimensional position sensor. There are some advantages and disadvantages in these two types of position sensitive device. Resolution of the linear image sensor is limited by the size of the elements and the pitch; in contrast, uniformity of the electrodes on the p-i-n diode and thickness of the a-Si thin film are the key factors for the resolution of one and two dimensional analogue PSDs.The analogue PSD is applicable to a digitizer which takes the role of a man-machine (computer) interface. The large area two dimensional digitizer was fabricated using the same technique as large area solar cell production, and was shown to be useful as a drawing tool on a CRT or other display devices with the aid of a micro-computer.

Effect of temperature during the synthesis process of CdSe nanoparticles using the colloidal technique

MRS Advances ◽  
2020 ◽  
Vol 5 (63) ◽  
pp. 3389-3395
Author(s):  
R. González-Díaz ◽  
D. Fernández-Sánchez ◽  
P. Rosendo-Francisco ◽  
G. Sánchez-Legorreta
Keyword(s):  
Scanning Tunneling Microscope ◽  
Electron Cloud ◽  
Cdse Nanoparticles ◽  
Effect Of Temperature ◽  
Synthesis Process ◽  
Scanning Tunneling ◽  
Tunneling Microscope ◽  
First Results ◽  
Effects Of Temperature ◽  
Scanning Electron

AbstractIn this work, the first results of the effects of temperature during the production of Se2- ions and the effect during the interaction of Cd2+ and Se2- ions in the synthesis process of CdSe nanoparticles are presented. The synthesis of CdSe was carried out by the colloidal technique, in the first one we used a temperature of 63 °C to produce Se2- ions and in the second one an interaction temperature of 49 °C. The samples were characterized using a Scanning Electron Microscope (SEM) and a Scanning Tunneling Microscope (STM). From the SEM micrographs it was possible to identify the thorns formation and irregular islands. STM micrographs reveal elliptical shapes with a regular electron cloud profile.

Temperature Effect on the Two-Dimensional Phase Transition Kinetics of Adenine Adsorbed at the Hg Electrode/Aqueous Solution Interface

2003 ◽  
Vol 68 (8) ◽  
pp. 1407-1419 ◽  
Author(s):  
Claudio Fontanesi ◽  
Roberto Andreoli ◽  
Luca Benedetti ◽  
Roberto Giovanardi ◽  
Paolo Ferrarini
Keyword(s):  
Phase Transition ◽  
Aqueous Solution ◽  
Phase Change ◽  
Temperature Effect ◽  
Transition Rate ◽  
Effect Of Temperature ◽  
Two Dimensional ◽  
Solution Interface ◽  
Phase Transition Kinetics ◽  
Kinetics Of

The kinetics of the liquid-like → solid-like 2D phase transition of adenine adsorbed at the Hg/aqueous solution interface is studied. Attention is focused on the effect of temperature on the rate of phase change; an increase in temperature is found to cause a decrease of transition rate.

Solution-processable exfoliation and photoelectric properties of two-dimensional layered MoS2 photoelectrodes

2017 ◽  
Vol 490 ◽  
pp. 287-293 ◽  
Author(s):  
Qiyi Zhao ◽  
Yaohui Guo ◽  
Yixuan Zhou ◽  
Xianding Yan ◽  
Xinlong Xu
Keyword(s):  
Two Dimensional ◽  
Photoelectric Properties ◽  
Solution Processable ◽  
Layered Mos2

Latest Research and Developing Tendency of Hyperbranched Polymers Fabrication

2021 ◽  
Vol 896 ◽  
pp. 45-50
Author(s):  
Lian Yi Huo ◽  
Xue Tao Shi ◽  
Si Ming Chen ◽  
Meng Yao Zhang
Keyword(s):  
Reaction Mechanism ◽  
Ring Opening ◽  
Hyperbranched Polymers ◽  
Ring Opening Polymerization ◽  
Synthesis Process ◽  
Future Research ◽  
Advantages And Disadvantages ◽  
Environmental Friendly ◽  
High Efficient ◽  
The Future

Hyperbranched polymers (HBPs) have been applied in various fields because of its outstanding biodegradability and biocompatibility. At present, there are a variety of methods that are used to fabricate HBPs, such as polycondensation, reactive polymerization and ring-opening polymerization according to reaction mechanism. These methods are all environmental-friendly and high-efficient to generate HBPs, and are valuable for industrialization. In this work, we conclude some common methods of HBPs fabrication and make the comparison between them to analyze their advantages and disadvantages, which contribute in how to improve the synthesis process in the future research.

scholarly journals Status of the two-dimensional, multi-wire proportional chamber detector for the China Spallation Neutron Source

2018 ◽  
Vol 48 ◽  
pp. 1860121 ◽  
Author(s):  
Zhiwen Wen ◽  
Huirong Qi
Keyword(s):  
Neutron Source ◽  
Neutron Detector ◽  
Detection Efficiency ◽  
Spallation Neutron Source ◽  
Two Dimensional ◽  
Large Area ◽  
Position Resolution ◽  
Proportional Chamber ◽  
High Detection Efficiency ◽  
Under Construction

The re-designed two-dimensional, multi-wire proportional chamber (MWPC) detector based on the [Formula: see text]He operation gas has been developed for the multifunctional reflection spectrum detection requirements in China Spallation Neutron Source (CSNS), which is under construction in Guangdong province, China. This efficient thermal neutron detector with large area (200 mm [Formula: see text] 200 mm active area), two-dimensional position sensitive (<2 mm of position resolution), high detection efficiency (>65% in the wavelength of 1.8Å) and good n/[Formula: see text] discrimination would meet some requirements in CSNS The neutron detector consists of a MWPC detector and a high-pressure gas vessel. The wire readout structures of the detector and the gas purity device have been optimized based on previous design and testing. The re-designed MWPC detector with an absorber thickness of 10 mm and 8.5 atm operating gas mixture of [Formula: see text]He and C[Formula: see text]H[Formula: see text] was constructed. Using the non-return valve manufactured by Swagelok, the gas purity device was developed to clean the water and remove gas impurities. The effective cycle time can be up to 50 min per sequence. The performance of the position resolution and the two-dimensional imaging accuracy by the traditional center of gravity readout method was studied with an X-ray radiation source and the neutron source. At the end of this year, the detector will be mounted at CSNS and studied using the neutron source.

Large Area Two-Dimensional B Cell Arrays for Sensing and Cell-Sorting Applications

2004 ◽  
Vol 5 (3) ◽  
pp. 822-827 ◽  
Author(s):  
Heejae Kim ◽  
Junsang Doh ◽  
Darrell J. Irvine ◽  
Robert E. Cohen ◽  
Paula T. Hammond
Keyword(s):  
B Cell ◽  
Cell Sorting ◽  
Two Dimensional ◽  
Large Area ◽  
Cell Arrays
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