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Preparation, characterization and gas-sensitive properties of nano-crystalline Cr_2O_3-Fe_2O_3 mixed oxides

Science China Chemistry 1998年第4期41卷 442-448页

作者：杨晓娟陈耐生沈水发刘尔生黄金陵 1. Institute of Research on the Functional Materials Department of Chemistry Fuzhou University 350002 Fuzhou China

A series of Fe 2-x Cr x O 3 ( x=0, 0.4, 0.8, 1.2, 1.6, 2.0) mixed oxides have been prepared with the chemical coprecipitation method and characterized by specific surface area, transmission electron microscopy (TEM), powder X ray diffraction (XRD), IR and Mssbauer spectroscopy. Single phase Fe Cr mixed oxide nano crystalline powders with corundum structure are obtained, and the results of the five characterization methods are well accordant with each other. Furthermore, gas sensitive properties of the sensors made of the oxide powders have been studied.

关键词： mixed oxide nano crystalline corundum structure semiconductivity gas sensitive properties.

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Electronic behavior of native oxide films on Ti and TiN during 90-day immersion in electrolytes with different pH levels

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Rare Metals 2021年第3期40卷 582-589页

作者： Amir Poursaee Golnaz Najaf-Tomaraei Marian S.Kennedy Department of Materials Science and Engineering and Glenn Department of Civil Engineering Clemson UniversityClemsonSC 29634USA Department of Materials Science and Engineering Clemson UniversityClemsonSC 29634USA

This work presents the electronic behavior of Ti and TiN thin films when exposed to electrolytes with pH levels of 2,7 and 13 for 90 *** potentio-electrochemical impedance spectroscopy tests were performed on the 100-nm Ti and TiN monolithic films,and MottSchottky analysis of these tests was used to determine the films’ semiconductive behavior and changes in the donor/acceptor *** addition,the flat-band potential of each film’s surface oxide was also *** attempt was made to control oxide formation,and therefore,these tests reflected the native surfaces of these *** the TiN films exhibited n-type semiconductivity in all electrolytes,the Ti films only showed n-type behavior in the acidic(pH=2) and neutral(pH=7) *** semiconductivity of the Ti films transitioned to p-type during exposure to the basic electrolyte(pH=13) after reaching 60 ***,there was a significant increase in the donor densities for both Ti and TiN films when immersed in the basic electrolyte relative to the acidic and neutral electrolytes.

关键词： Ti TiN Thin films Mott-Schottky analysis semiconductivity

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Synthesis and Conductivity of a One-dimensional Polymer of a Copper(Ⅱ)-porphyrazine with Sulfur Bridges

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Chinese Chemical Letters 1998年第7期9卷 639-642页

作者： Zheng He PENG Shou Xing WANG Yi Hai WEI and Zi Bin QIN (Department of Chemistry Wuhan University, Wuhan 430072)

A novel conjugated polymer which shows sendconductivity at T 286K and metallic conductivity at 260K < T< 286K was syllthesized by reaction of 2, 3, 5, 6-tetracyano1, 4-dithiin and phthalonitrile with CuCl2.2H2O.

关键词： Copper(Ⅱ)-porphyrazine one-dimensional polymer semiconductivity

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Properties of mixture of nanometer crystals and amorphous silicon

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Progress in Natural Science:Materials International 1997年第1期 34-42页

作者：程开甲程漱玉 China Northwest Nuclear Technology Institute Xi’an 710024

TFD model is employed to analyse the mechanism in the abrupt changes of conductivity of a mixture of nanometer sire crystals and two amorphous specimens. Criterions are proposed to raise the conductivity and ductility of the mixture. There will be possibilities to design light and ductile substances from light elements in nanometer size.

关键词： nanometer semiconductivity depletion zone.

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