SnO@rGO 纳米杂化材料的简便合成及其甲烷传感参数的优化。

Facile synthesis of a SnO@rGO nanohybrid and optimization of its methane-sensing parameters.

机构信息

Advanced Materials and Nanotechnology Research Lab, Department of Materials Science and Engineering, K.N. Toosi University of Technology, Tehran, Iran.

出版信息

Talanta. 2018 May 1;181:422-430. doi: 10.1016/j.talanta.2018.01.015. Epub 2018 Jan 9.

DOI:10.1016/j.talanta.2018.01.015

PMID:29426535

Abstract

Stannic oxide nanoparticles and various compositions of SnO@rGO (reduced graphene oxide) nanohybrids were synthesized by a facile hydrothermal method and utilized as chemiresistive methane gas sensors. To characterize the synthesized nanohybrids, BET (Brunauer-Emmett-Teller), XRD, FESEM, TEM, FTIR, and Raman techniques were used. Sensing elements were tested using a U-tube flow chamber with temperature control. To obtain the best sensor performance, i.e., the highest signal and the fastest response and recovery times, the sensing element composition, operating temperature, and gas flow rate were optimized. The highest response (change in resistance) of 47.6% for 1000 ± 5ppm methane was obtained with the SnO@rGO1% nanohybrid at 150°C and a flow rate of 160sccm; the response and recovery times were 61s and 5min, respectively. A sensing mechanism was suggested, based on the experiments.

摘要

氧化锡纳米颗粒和不同组成的 SnO@rGO（还原氧化石墨烯）纳米杂化物通过简便的水热法合成，并用作电阻式甲烷气体传感器。为了表征合成的纳米杂化物，使用 BET（Brunauer-Emmett-Teller）、XRD、FESEM、TEM、FTIR 和 Raman 技术。使用带有温度控制的 U 形管流动室测试传感元件。为了获得最佳的传感器性能，即最高的信号和最快的响应和恢复时间，优化了传感元件的组成、工作温度和气流率。在 150°C 和气流率为 160sccm 的条件下，SnO@rGO1%纳米杂化物对 1000±5ppm 甲烷的响应（电阻变化）最高可达 47.6%；响应和恢复时间分别为 61s 和 5min。基于实验提出了一种传感机制。