Gas Sensing Properties of Methane Based on Al2O3-Doped Multi-Walled Carbon Nanotubes
Gas Sensing Properties of Methane Based on Al2O3-Doped Multi-Walled Carbon Nanotubes
复制标题
基于Al2O3掺杂多壁碳纳米管的甲烷气敏性能
DOI：
10.1166/jno.2018.2484
复制
发表时间：
2018-11
影响因子：
0.6
通讯作者：
Qu Fang
中科院分区：
文献类型：
--
作者：
Liu Xin-Lei;Shen Bin;Zhang Hongquan;Sun Yongyi;Qu Fang
本文报道了基于al2o3掺杂的多壁碳纳米管（MWCNTs）的甲烷气敏性能。采用低压化学气相沉积（LPCVD）法制备了MWNTs。在特定的反应条件下，将不同比例的MWNTs与Al2O3粉末混合，制备了γ-Al2O3/MWNTs复合材料。将所制备的复合材料作为制备高效微悬臂结构甲烷气体传感器的有效材料。气体传感实验结果表明，与纯Al2O3相比，MWNTs的加入显著提高了甲烷传感器的灵敏度和响应时间。当甲烷气体浓度为1.0%时，改进后的传感器灵敏度可达14.0 mv，并具有良好的线性关系。设计的新型传感器对甲烷的响应速度快，在9秒内响应90%，恢复时间为8秒。在其他常见干扰气体存在的情况下，该传感器对甲烷气体具有较高的选择性。综上所述，MWNTs掺杂在γ-Al2O3中可以提高催化燃烧传感器的传感性能。
This paper reports, the methane gas sensing properties based on Al2O3-doped multi-walled carbon nanotubes (MWCNTs). The MWNTs were prepared by low pressure chemical vapor deposition (LPCVD) process. The γ-Al2O3/MWNTs composite was prepared by mixing different ratios of MWNTs and Al2O3 powder at particular reaction conditions. The prepared composite was used as effective material to fabricate high efficient methane gas sensor with micro-cantilever structure. The observed gas sensing results revealed that the incorporation of MWNTs significantly improved the sensitivity and response time of the newly fabricated methane sensor compared with pure Al2O3. When the methane gas concentration was 1.0%, the sensitivity of the improved sensor was reached to 14.0 mv, with a good linear relationship. The designed new sensor has a fast response to methane, with a 90% response in 9 s and a recovery time of 8 s. The fabricated sensor exhibited high selectivity towards methane gas in presence of other common interfering gases. Thus, it can be concluded that the sensing performance of a catalytic combustion sensor can be enhanced by doping MWNTs into γ-Al2O3.