Preparation of High-quality Graphene via Electrochemical Exfoliation in Acidic Electrolytes: A Review

MRS Advances ◽  
2017 ◽  
Vol 2 (30) ◽  
pp. 1611-1619 ◽  
Author(s):  
Youning Gong ◽  
Chunxu Pan
Keyword(s):  
Technological Innovation ◽  
Material Science ◽  
Recent Progress ◽  
High Efficiency ◽  
Low Cost ◽  
High Quality ◽  
Chemical Methods ◽  
Electrochemical Exfoliation ◽  
Potential Applications ◽  
Wet Chemical

ABSTRACTSince the discovery of graphene in 2004, graphene has already been one of the researching hotspots in the material science. As a promising method, electrochemical exfoliation has drawn great attention for producing graphene on industrial scale with high efficiency, low cost, and non-pollution. However, like other wet-chemical methods, the induced oxidation and chemical functionalization are unavoidable during the exfoliation process. Several solutions have been reported to overcome this issue and improve the graphene quality. In this review, we summarize the recent progress in preparation and potential applications of high-quality graphene via electrochemical exfoliation in acidic electrolytes, focusing on the technological innovation and related properties of obtained high-quality graphene.

Sintering and Hot-Pressing of Ti2AlC Obtained by SHS Process

2010 ◽  
Vol 63 ◽  
pp. 282-286 ◽  
Author(s):  
Leszek Chlubny ◽  
Jerzy Lis ◽  
Mirosław M. Bućko
Keyword(s):  
Hot Pressing ◽  
High Efficiency ◽  
Layer Structure ◽  
Low Cost ◽  
Max Phases ◽  
Fine Powders ◽  
High Temperature Synthesis ◽  
Low Energy Consumption ◽  
Potential Applications ◽  
Xrd Method

Some of ternary materials in the Ti-Al-C system are called MAX-phases and are characterised by heterodesmic layer structure. Their specific structure consisting of covalent and metallic chemical bonds influence its semi-ductile features locating them on the boundary between metals and ceramics, which may lead to many potential applications, for example as a part of a ceramic armour. Ti2AlC is one of this nanolaminate materials. Self-propagating High-temperature Synthesis (SHS) was applied to obtain sinterable powders of Ti2AlC Utilization of heat produced in exothermal reaction in adiabatic conditions to sustain process until all substrates are transformed into product is one of the advantages of the method that result in low energy consumption and low cost combined with high efficiency. Different substrates were used to produce fine powders of ternary material. Phase compositions of obtained powder were examined by XRD method. Than selected powders were used for sintering in various temperature both in a presureless sintering and hot-pressing in argon atmosphere. Properties and phase composition of obtained products were examined.

Heteroepitaxy of Ge on Cube-Textured Ni(001) Foils Through CaF2 Buffer Layer

MRS Advances ◽  
2016 ◽  
Vol 1 (43) ◽  
pp. 2947-2952
Author(s):  
L. Chen ◽  
Z.-H. Lu ◽  
T.-M. Lu ◽  
I. Bhat ◽  
S.B. Zhang ◽  
...  
Keyword(s):  
Buffer Layer ◽  
High Efficiency ◽  
Electron Backscatter Diffraction ◽  
Low Cost ◽  
High Quality ◽  
Tem Analysis ◽  
Transmission Electron ◽  
Electron Backscatter ◽  
Image Position ◽  
Backscatter Diffraction

ABSTRACTEpitaxial Ge films are useful as a substrate for high-efficiency solar cell applications. It is possible to grow epitaxial Ge films on low cost, cube textured Ni(001) sheets using CaF2(001) as a buffer layer. Transmission electron microscopy (TEM) analysis indicates that the CaF2(001) lattice has a 45o in-plane rotation relative to the Ni(001) lattice. The in-plane epitaxy relationships are CaF2[110]//Ni[100] and CaF2[$\bar 1$10]//Ni[010]. Energy dispersive spectroscopy (EDS) shows a sharp interface between Ge/CaF2 as well as between CaF2/Ni. Electron backscatter diffraction (EBSD) shows that the Ge(001) film has a large grain size (∼50 μm) with small angle grain boundaries (< 8o). The epitaxial Ge thin film has the potential to be used as a substrate to grow high quality III-V and II-VI semiconductors for optoelectronic applications.

scholarly journals The design and research of the shared kitchen system in the hospital

2018 ◽  
Vol 176 ◽  
pp. 01011
Author(s):  
YE Xin ◽  
JI Qian
Keyword(s):  
Quality Of Life ◽  
Social Interaction ◽  
High Efficiency ◽  
Low Cost ◽  
Space System ◽  
High Quality ◽  
Economy Model ◽  
New Directions ◽  
The Right

The shared economy has been developing rapidly with low cost, low consumption and high environmental efficiency features under the background of internet waves. The shared economy model has emerged in housing, catering, and travel. As people look forward to high quality of life and their social interaction need, the shared kitchen platform arises at the right moment. This paper takes the shared kitchen as an example, focusing on the patients and their caregivers, the existing shared kitchens and its service platform as well as the space system design and human-computer interaction of the shared kitchen have been investigated and analysized. Taking the "high efficiency, the intelligence and the humanization" as the design principles, we are committed to exploring new directions for modular kitchen design under the background of shared economy.

scholarly journals Copper Oxide Nanomaterials Prepared by Solution Methods, Some Properties, and Potential Applications: A Brief Review

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Thi Ha Tran ◽  
Viet Tuyen Nguyen
Keyword(s):  
Large Scale ◽  
Cupric Oxide ◽  
Bulk Material ◽  
Precursor Solution ◽  
High Quality ◽  
Chemical Methods ◽  
Narrow Bandgap ◽  
Solution Methods ◽  
Potential Applications ◽  
Near Future

Cupric oxide (CuO), having a narrow bandgap of 1.2 eV and a variety of chemophysical properties, is recently attractive in many fields such as energy conversion, optoelectronic devices, and catalyst. Compared with bulk material, the advanced properties of CuO nanostructures have been demonstrated; however, the fact that these materials cannot yet be produced in large scale is an obstacle to realize the potential applications of this material. In this respect, chemical methods seem to be efficient synthesis processes which yield not only large quantities but also high quality and advanced material properties. In this paper, the effect of some general factors on the morphology and properties of CuO nanomaterials prepared by solution methods will be overviewed. In terms of advanced nanostructure synthesis, microwave method in which copper hydroxide nanostructures are produced in the precursor solution and sequentially transformed by microwave into CuO may be considered as a promising method to explore in the near future. This method produces not only large quantities of nanoproducts in a short reaction time of several minutes, but also high quality materials with advanced properties. A brief review on some unique properties and applications of CuO nanostructures will be also presented.

scholarly journals Modeling Frequency Comb Sources

Nanophotonics ◽  
2016 ◽  
Vol 5 (2) ◽  
pp. 292-315 ◽  
Author(s):  
Feng Li ◽  
Jinhui Yuan ◽  
Zhe Kang ◽  
Qian Li ◽  
P. K. A. Wai
Keyword(s):  
Recent Progress ◽  
Frequency Comb ◽  
Low Cost ◽  
Theoretical Models ◽  
High Quality ◽  
Operation Mechanism

AbstractFrequency comb sources have revolutionized metrology and spectroscopy and found applications in many fields. Stable, low-cost, high-quality frequency comb sources are important to these applications. Modeling of the frequency comb sources will help the understanding of the operation mechanism and optimization of the design of such sources. In this paper,we review the theoretical models used and recent progress of the modeling of frequency comb sources.

Low-cost Photogrammetry for Culture Heritage

2017 ◽  
Author(s):  
Roman Shults ◽  
Petro Krelshtein ◽  
Iulia Kravchenko ◽  
Olga Rogoza ◽  
Oleksandr Kyselov
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
3D Models ◽  
Theory And Practice ◽  
Quality Data ◽  
Digital Cameras ◽  
High Quality ◽  
Culture Heritage ◽  
Practical Guidelines ◽  
Close Range

Culture heritage will always remain one of the priorities of any state. Taking a cultural or historical object under protection is impossible without inventory. The best technology, which allows getting high-quality inventory, is close-range photogrammetry. Unfortunately, the full capabilities of this technology is fully owned by professionals only. The situation changed significantly with the advent of mobile devices that are equipped with digital cameras and low-cost software that does not require any special knowledge in the theory and practice of photogrammetry. These developments have been called lowcost photogrammetry technologies. In the present study, we examined the use of smartphones and nano UAV and PhotoScan software for solve the problem fortifications II World War inventory near the city of Kiev. For qualitative data, the calibration of digital cameras in smartphones and ultra-light UAV was performed on calibration bench. One of the features of this project was the integration of the terrestrial photos and photos captured by nano UAVs. As a result of work performed were obtained 3D models of fortifications. Results showed high efficiency of the low-cost photogrammetry technologies. At the end of work some practical guidelines were provided, how to get high-quality data using low-cost photogrammetry technologies.

Research Progress of Paper-Based Microfluidic Devices

2013 ◽  
Vol 421 ◽  
pp. 334-336 ◽  
Author(s):  
Yong Qiang Cheng ◽  
Cui Lian Guo ◽  
Yang Li ◽  
Bin Zhao ◽  
Xiao Cui
Keyword(s):  
Environmental Monitoring ◽  
Plasma Etching ◽  
Biological Samples ◽  
Recent Progress ◽  
Point Of Care ◽  
Low Cost ◽  
Microfluidic Devices ◽  
Research Progress ◽  
Potential Applications

Paper-based microfluidic devices have recently received increasing attention as a potential platform for its low cost, portability and excellent compatibility with biological samples. A variety of fabrication technologies were employed, including simple photolithography, wax plotting, printing, inkjet etching, plasma etching and so on. Meanwhile, the potential applications of paper-based microfluidic devices in diagnostic, point-of-care (POC), and environmental monitoring were reported. We review the recent progress of fabrication technologies and the applications of paper-based microfluidic devices.

Study on Simulation of Stamping Forming and Die Surface Optimization of Aluminum Alloy Plate

2018 ◽  
Vol 764 ◽  
pp. 303-311
Author(s):  
Miao Hu ◽  
Zhi Qiang Yang ◽  
Xiao Lin Cao ◽  
Qing Yang ◽  
Yu Chen ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Production Efficiency ◽  
High Efficiency ◽  
Low Cost ◽  
High Quality ◽  
Surface Design ◽  
Alloy Plate ◽  
Die Life ◽  
Die Surface ◽  
Blank Holding Force

Along with the automobile lightweight development, aluminum has become the focus of its own material characteristics. The aluminum alloy products with high efficiency, high quality and low cost are the guarantee of competitive advantage. High quality die surface is directly related to the product quality, cost, production efficiency, die life and so on. In this paper, the stamping process of two kinds of aluminum alloy products was simulated by Auto Form. The method of setting blank holding force and spring back compensation was introduced. At the same time, the setting of parameters such as die fillet, friction coefficient and draw bead was described in this paper. Finally, the optimization of die surface design was achieved by simulation.

scholarly journals High Quality GaAs Epilayers Grown on Si Substrate Using 100 nm Ge Buffer Layer

2016 ◽  
Vol 2016 ◽  
pp. 1-5 ◽  
Author(s):  
Wei-Cheng Kuo ◽  
Hung-Chi Hsieh ◽  
Wu Chih-Hung ◽  
Huang Wen-Hsiang ◽  
Chien-Chieh Lee ◽  
...  
Keyword(s):  
Buffer Layer ◽  
High Efficiency ◽  
Electron Cyclotron Resonance ◽  
Low Cost ◽  
Chemical Vapor ◽  
Buffer Layers ◽  
High Quality ◽  
Tandem Solar Cells ◽  
Hydrogen Flow ◽  
Transmission Electron

We present high quality GaAs epilayers that grow on virtual substrate with 100 nm Ge buffer layers. The thin Ge buffer layers were modulated by hydrogen flow rate from 60 to 90 sccm to improve crystal quality by electron cyclotron resonance chemical vapor deposition (ECR-CVD) at low growth temperature (180°C). The GaAs and Ge epilayers quality was verified by X-ray diffraction (XRD) and spectroscopy ellipsometry (SE). The full width at half maximum (FWHM) of the Ge and GaAs epilayers in XRD is 406 arcsec and 220 arcsec, respectively. In addition, the GaAs/Ge/Si interface is observed by transmission electron microscopy (TEM) to demonstrate the epitaxial growth. The defects at GaAs/Ge interface are localized within a few nanometers. It is clearly showed that the dislocation is well suppressed. The quality of the Ge buffer layer is the key of III–V/Si tandem cell. Therefore, the high quality GaAs epilayers that grow on virtual substrate with 100 nm Ge buffer layers is suitable to develop the low cost and high efficiency III–V/Si tandem solar cells.

Surface effects on optical and electrical properties of ZnO nanostructures

2010 ◽  
Vol 82 (11) ◽  
pp. 2055-2073 ◽  
Author(s):  
Cheng-Ying Chen ◽  
Ming-Wei Chen ◽  
Jr-Jian Ke ◽  
Chin-An Lin ◽  
José R. D. Retamal ◽  
...  
Keyword(s):  
High Efficiency ◽  
Surface Effect ◽  
Low Cost ◽  
Dye Sensitized Solar Cells ◽  
Surface Effects ◽  
Industrial Applications ◽  
Zno Nanostructures ◽  
New Class ◽  
Potential Applications ◽  
Sensitized Solar Cells

This article presents a comprehensive review of the current research addressing the surface effects on physical properties and potential applications of nanostructured ZnO. Studies illustrating the transport, photoluminescence (PL), and photoconductivity properties of ZnO with ultrahigh surface-to-volume (S/V) ratio are reviewed first. Secondly, we examine recent studies of the applications of nanostructured ZnO employing the surface effect on gas/chemical sensing, relying on a change of conductivity via electron trapping and detrapping process at the surfaces of nanostructures. Finally, we comprehensively review the photovoltaic (PV) application of ZnO nanostructures. The ultrahigh S/V ratios of nanostructured devices suggest that studies on the synthesis and PV properties of various nanostructured ZnO for dye-sensitized solar cells (DSSCs) offer great potential for high efficiency and low-cost solar cell solutions. After surveying the current literature on the surface effects on nano-structured ZnO, we conclude this review with personal perspectives on a few surface-related issues that remain to be addressed before nanostructured ZnO devices can reach their ultimate potential as a new class of industrial applications.

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