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首页> 外文期刊>CERAMICS INTERNATIONAL >Effects of Cu addition on CO gas-sensing properties of TiO2 prepared by oxidizing mechanically-synthesized TiN composites
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Effects of Cu addition on CO gas-sensing properties of TiO2 prepared by oxidizing mechanically-synthesized TiN composites

机译：铜的添加对机械合成TiN复合材料制备的TiO2的CO气敏性能的影响

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摘要

TiN-Cu composites were synthesized in a pressurized N-2 atmosphere using a ball milling process. TiO2 sensing materials were added with 0-8 at% Cu, which was prepared via oxidation at temperatures of 600 and 800 degrees C. Structural characterization was performed using X-ray diffraction, Field emission scattering electron microscopy (FE-SEM), and Transmission electron microscopy (TEM). Cu addition promoted anatase-to-rutile transformation and grain growth, and the responses of the samples that were oxidized at 600 degrees C with CO gas were enhanced by adding Cu to TiO2 compared with the unmodified TiO2. The TiO2 materials with 4% Cu showed the greatest response to CO of 4.1 at 1000 ppm of CO gas, which can be compared to the response value of 1.2 of unmodified TiO2 CO gas under identical conditions. The enhancement of TiO2 sensitivity to CO gas is believed to originate from well-dispersed metallic and Cu oxides, which are known catalysts for the oxidation of CO gas. When the oxidation temperature was increased to 800 degrees C, the strongly bound CuO particles dissociated, and the response changed to p-type. It is proposed that the segregation induces a conduction pathway through CuO. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
机译：使用球磨工艺在加压的N-2气氛中合成TiN-Cu复合材料。向TiO2传感材料中添加0-8 at％的Cu，该Cu是通过在600和800摄氏度的温度下进行氧化制备的。结构表征是使用X射线衍射，场发射散射电子显微镜（FE-SEM）和透射率进行的电子显微镜（TEM）。铜的添加促进了锐钛矿到金红石的转变和晶粒的生长，与未改性的TiO2相比，向TiO2中添加Cu可以增强在600摄氏度下用CO气体氧化的样品的响应。含4％Cu的TiO2材料在1000 ppm CO气体下对4.1的CO响应最大，这可以与相同条件下未改性TiO2 CO气体的1.2响应值进行比较。认为提高TiO2对CO气体的敏感性是由于分散良好的金属氧化物和Cu氧化物引起的，这些氧化物是众所周知的CO气体氧化的催化剂。当氧化温度升高至800℃时，牢固结合的CuO颗粒解离，并且响应变为p型。提出了偏析诱导通过CuO的传导途径。 （C）2015 Elsevier Ltd和Techna Group S.r.l.版权所有。

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