Ag掺杂CuO微米管制备及气敏性能测试

Fabrication and gas sensing performance of Ag doped CuO microtubes

以脱脂棉为模板,硝酸铜为铜源,采用浸渍与烧结方法制备CuO;引入不同量的Ag修饰CuO形成Ag/CuO微米管复合结构,用于挥发性有机物检测。利用热分析仪(TG)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、 X射线衍射(XRD)和X射线光电子能谱(XPS)等手段分析样品的烧结情况、表面形貌、微结构、晶体结构和化学成分。结果表明,所制备的CuO样品均为单斜相,且成功复刻了脱脂棉结构,整体呈微米管状;引入的Ag与CuO成功复合,形成Ag/CuO微米管复合结构。引入适当含量Ag可有效提升CuO微米管对乙醇的检测能力,Cu/Ag摩尔比10∶1的传感器对100μL/L乙醇的检测灵敏度达14.87,响应/恢复时间为349 s/147 s,具有良好的重复性与长期稳定性。

Taking absorbent cotton(AC)as template,Cu(NO,)2 as copper source,CuO was prepared by impregnation and sintering method,and then different amounts of Ag was added to modify CuO to achieve Ag/CuO microtubes composite structure,which can be used for the detection of volatile organic compounds.The sintering situation,morphology,microstructure,crystal structure and chemical composition were analyzed by thermogravimetric analyzer(TC),scanning electron microscope(SEM),transmission electron microscope(TEM),X-ray diffractometer(XRD)and X-ray energy spectrum(XPS).The results showed that the prepared monoclinic CuO successfully replicated the structure of AC with a tubular structure in whole;the added Ag was successfully complexed with CuO,forming Ag/CuO microtube composite structure.Appropriate amount of Ag was introduced to effectively improve the detection ability of CuO microtubes for ethanol.At 160°C,the sensor with copper-silver molar ratio of 10:1 had a sensitivity of 14.87 to 100μL/L ethanol,with the response/recovery time of 349 s/147 s,and good repeatability and long-term stability.