Nanoporous network SnO2 constructed with ultra-small nanoparticles for methane gas sensor
Nanoporous network SnO2 constructed with ultra-small nanoparticles for methane gas sensor
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DOI：
10.1007/s10854-019-01802-2
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发表时间：
2019-08-01
影响因子：
2.8
通讯作者：
Wang, Yude
中科院分区：
文献类型：
--
作者：
Hong, Ping;Li, Yuxiu;Wang, Yude
对甲烷（CH 4）浓度进行监测可以有效地保护环境免受甲烷排放的危害。甲烷气体传感器的高敏感性能仍然是一个相当大的挑战。本文针对上述问题，采用弱酸性葡萄糖辅助水热合成法，成功合成了具有超小纳米颗粒的纳米多孔网络结构SnO 2（NN-SnO 2），该材料对甲烷具有优异的气敏性能。NN-SnO 2显示出三种特殊的颗粒形貌：圆形，椭圆形和多边形，平均粒径约为9 nm。当作为甲烷的敏感材料进行评估时，NN-SnO 2传感器表现出超高的响应（R-a/R-g = 9.80）、在420摄氏度的操作温度下对3000 ppm甲烷的快速响应/恢复时间（τ（res）/τ（recov）= 1 s/3 s），这远远上级绝大多数甲烷半导体传感器，并且更重要的是，基于NN-SnO 2的传感器对甲烷表现出如此优异的气敏性能还未见报道。NN-SnO 2对甲烷气体的突出响应来自于所合成的NN-SnO 2的独特的介孔性质和小的颗粒尺寸，以及SnO 2纳米颗粒表面与甲烷气体分子之间的电荷转移。
Monitoring the concentration of methane (CH4) can effectively protect the environment from the damage of methane emission. The high sensing performances of methane gas sensor still remain a considerable challenge. Herein, to solve problems mentioned above, nanoporous network SnO2 (NN-SnO2) construct with ultra-small nanoparticles, which exhibits excellent gas-sensing performances for methane, are successfully synthesized via a weak acid glucose-assisted hydrothermal synthesis. The NN-SnO2 displays three particular particle morphologies: roundness, oval and polygon, with an average particle size of similar to 9 nm. When evaluated as a sensing material for methane, the NN-SnO2 sensor exhibits ultra-high response (R-a/R-g = 9.80), fast response/recovery times (tau(res)/tau(recov)= 1 s/3 s) toward 3000 ppm methane at a operating temperature of 420 degrees C, which are far superior to the vast majority methane semiconducting sensors, and more importantly, it has barely been reported that the sensor based on NN-SnO2 presented such excellent gas-sensing performances for methane. The outstanding response of the NN-SnO2 for methane gas is derived from the unique mesopores nature and small particles sizes of the as-synthesized NN-SnO2, and the charge transfer between the surface of SnO2 nanoparticles and methane gas molecules.