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Miao F.,Qiqihar UniversityHeilongjiang | Miao F.,CAS Shanghai Institute of Technical Physics | Tao B.,CAS Shanghai Institute of Technical Physics | Tao B.,Qiqihar UniversityHeilongjiang | Chu P.K.,City University of Hong Kong
Materials Research Bulletin | Year: 2015

Bi4-xNdxTi3O12 (BNT) films with different Nd contents (from 0 to 1 with 0.25 intervals) are prepared by the sol-gel process. The Nd substitution effects on the preferred orientation, surface morphology, phonon modes, emission bands, andelectronic band structures of the BNT films are investigated by microscopy, Raman scattering, photoluminescence, and spectroscopic ellipsometry (SE) at room temperature. X-ray diffraction indicates that the films are polycrystalline with the pure perovskite phase. Ten Raman active modes and one silicon substrate mode can be observed. The A1 g[Bi] at about 59 cm-1 is unchanged whereas the B1 g and A1 g[Ti] phonon modes shift towards higher frequencies. Photoluminescence shows that the intensities of the two peaks increase with Nd concentration except the Bi3NdTi3O12 film, due to the smallest grain size and oxygen vacancy defects. Good optical functions of the BNT films are achieved due to the SE suggesting potential applications in ferroelectric-based optoelectronic devices. © 2014 Elsevier Ltd. All rights reserved. Source


Miao F.,Qiqihar UniversityHeilongjiang | Lu X.,Qiqihar UniversityHeilongjiang | Tao B.,Qiqihar UniversityHeilongjiang | Li R.,Qiqihar UniversityHeilongjiang | Chu P.K.,City University of Hong Kong
Microelectronic Engineering | Year: 2016

A nanostructured platform composed of ZnO nanowires supported by silicon nanowires (ZnO/SiNWs) is utilized to immobilize glucose oxidase on a glucose enzymatic biosensor. The SiNWs arrays are fabricated by a simple metal-catalyzed solution method under normal conditions and ZnO nanowires about 650 nm long are produced on the wall of the silicon nanowires by aqueous thermal decomposition. The large specific surface area, abundant microspace, small channels, and high isoelectric point (IEP) fracture of ZnO enable effective fluid circulation and good biocompatibility boding well for immobilization of enzymes. The nanocomposite materials show good electrocatalytic activity exhibiting strong and sensitive response to glucose even in the presence of high concentrations of interfering species besides excellent long-term stability and reproducibility. © 2015 Elsevier B.V. Source


Wang X.,Harbin Engineering UniversityHeilongjiang | Wang X.,Qiqihar UniversityHeilongjiang | Jia L.,Qiqihar UniversityHeilongjiang | Liu Q.,Harbin Engineering UniversityHeilongjiang | And 4 more authors.
Colloids and Surfaces A: Physicochemical and Engineering Aspects | Year: 2016

3D flower-like Co3O4/Polypyrrole (PPy) nanosheet networks are directly grown onto Ni foam involving the solution-based method and in-situ oxidative polymerization of pyrrole for supercapacitor electrode materials. The as-prepared electrode takes advantage of the exceptional architecture of Co3O4 and high electronic conductivity of PPy. Electrochemical measurements show that the areal capacitance of 3D Co3O4/PPy electrode is 6.81 F cm−2 at 5 mA cm−2 in 6 mol L−1 KOH aqueous solution. The capacitance is 95% of original capacitance after 1000 cycles at 20 mA cm−2. With superior electrochemical characteristics and the ease of large scale fabrication, the 3D flower-like Co3O4/Polypyrrole nanosheet networks provide promising electrode material for supercapacitor applications. © 2016 Elsevier B.V. Source


Miao F.,Uppsala University | Miao F.,Qiqihar UniversityHeilongjiang | Majee S.,Uppsala University | Song M.,Uppsala University | And 3 more authors.
Synthetic Metals | Year: 2016

In this study, we report on a facile method of inkjet printing of graphene nano-platelets (GNPs). The GNPs are exfoliated from graphite by means of an electrochemical process in an inorganic salt based electrolyte. The electrochemically exfoliated GNPs with oxygen-bearing functional groups exhibit spectroscopic features similar to those of reduced graphene oxides. As a result, ink formulation with such GNPs for inkjet printing readily accomplishes without using stabilizer and various conductive objects are easily fabricated on different substrates by inkjet printing. The as-printed films of the electrochemically exfoliated GNPs deliver an electrical conductivity of 44 S/m, a typical value for as-printed pristine GNP films in the literature. A simple thermal treatment results in an improved DC conductivity by two orders of magnitude to ∼2.5 × 103 S/m. © 2016 Elsevier B.V. Source

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