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Yan Z.,Powder Metallurgy Research Institute | Xiong X.,Powder Metallurgy Research Institute | Chen Y.,Central South University | Ou-Yang F.-P.,Powder Metallurgy Research Institute | Ou-Yang F.-P.,Central South University
Superlattices and Microstructures | Year: 2014

The properties of graphene absorption on graphene-like material can be modulated by the stacking arrangement. Here, we propose a "least squares" classification method for analyzing configuration types of graphene/molybdenum disulfide heterobilayers (G/MoS2 HBLs) while binding energy, electronic structure and optical absorption of G/MoS2 HBLs are investigated via first principles calculations. Owing to the lattice mismatch, no traditional AA and AB stacking exist but AA- and AB-stacking-like configurations have been found. Paradoxically, AB-stacking-like configuration, generally as the most stable stacking sequence, does not correspond to the relaxed structure. We interpret this paradox in terms of graphene corrugation. A detailed analysis of the electronic structure indicates that bandgaps of all configurations types (types of G/MoS2 HBLs) are opened and tunable under the different interlayer distance. Furthermore, compared with monolayer MoS2, G/MoS2 HBLs display an enhanced light response, a promising feature for photocatalytic applications. © 2014 Published by Elsevier Ltd. Source


Chen Y.,Central South University | Chen Y.,Massachusetts Institute of Technology | Li A.,Central South University | Li Y.,Central South University | And 5 more authors.
RSC Advances | Year: 2015

A novel two-step method is proposed to fabricate porous zirconia (ZrO2) thin films. A large-scale ZrO2 thin film is thus achieved, which displays a very good light transparency, as its total transmissivity is higher than 95% within the wavelength range of 450-1100 nm, a broad range just covering both the visible and near-infrared spectral range. This property makes it a promising candidate for solar cells as a high-temperature-resistant insulating layer. © The Royal Society of Chemistry 2015. Source


Chen Y.,Central South University | Xia H.,Central South University | Zhang D.,Central South University | Yan Z.,Powder Metallurgy Research Institute | And 3 more authors.
RSC Advances | Year: 2014

A simple method for preparing porous ZrO2 has been proposed by directly decomposing a Zr(NO3)4·5H2O ethanol sol-gel solution. Contrary to other traditional sol-gel methods, porous ZrO2 with multi-sized macro- and meso-pores are synthesized via only one simple step. The size of the macropores ranges from 100 nm to 500 nm. Remarkably, we also isolated some highly dispersed ZrO2 nanoparticles (∼60 nm), which on their surface or even in the whole body are fully filled with well-sized ever-smaller spherical mesopores with an average diameter around ∼5 nm. A further investigation of low-temperature nitrogen absorption has shown a high surface area over 162 m2 g-1 for the fully crystallized ZrO2. No more additional modifiers or complicated preparations are needed in the present method, which promises a new potential option in fabricating high-porosity materials. © 2014 The Royal Society of Chemistry. Source


Savich V.,Powder Metallurgy Research Institute | Taraykovich A.,Powder Metallurgy Research Institute | Bedenko S.,Powder Metallurgy Research Institute
Powder Metallurgy | Year: 2013

The properties of porous Ti disc aerators for water treatment were investigated. It is shown that the addition of 5-15 wt-% of a finer (100-160 μm) sponge titanium powder to the coarser (630-1000 μm) base powder can increase the tensile strength of the discs obtained by a factor of two. This allows weight savings of 44% to be obtained at comparable strength levels for discs 188 mm in diameter. The discs produced from mixed powders also produce finer bubbles and have lower permeability, which can lead to energy savings through reduced pump power consumption. © 2013 Institute of Materials, Minerals and Mining. Source

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