摘要
基于气体传感器对H2的泄漏进行探测监控,可以有效预防和控制H2火灾爆炸事故的发生。通过阳极氧化法制备了高度有序的二氧化钛(TiO2)纳米管阵列并制成气体传感器元器件,研究其在空气气氛中对H2的气敏特性。通过粉末X射线衍射(XRD)、扫描电子显微镜(SEM),透射电子显微镜(TEM)表征手段研究了TiO2纳米管的相组成和微观结构。TiO2纳米管具有优异的气敏性能,可在200℃以上对H2进行有效探测,检测极限达到20ppm。325℃对1000ppmH2灵敏度为446,响应时间为2s,对H2选择性好。
The use of gas sensors to monitor the early leakage of hydrogen is of great significance.In this work,an array of highly ordered Titanium dioxide(TiO2)nanotubes was fabricated by anodization,and the H2 gas sensing properties were studied in air atmosphere.The phase composition and microstructure of TiO2 nanotubes were investigated by powder X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM).TiO2 nanotubes could effectively detect H2 above 200℃with excellent performance.A high sensitivity of 446 and short response time of 2s for 1 000 ppm H2 at 325℃as well as remarkable selectivity were obtained.
作者
荀海涛
易建新
XUN Haitao;YI Jianxin(State Key Laboratory of Fire Science,University of Science and Technology of China,Hefei 230026,China)
出处
《火灾科学》
CAS
CSCD
北大核心
2018年第4期248-253,共6页
Fire Safety Science
基金
国家自然科学基金(U1432108)
