Au-Decorated 1D SnO2 Nanowire/2D WS2 Nanosheet Composite for CO Gas Sensing at Room Temperature in Self-Heating Mode
Au-Decorated 1D SnO2 Nanowire/2D WS2 Nanosheet Composite for CO Gas Sensing at Room Temperature in Self-Heating Mode
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DOI：
10.3390/chemosensors10040132
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发表时间：
2022-04
期刊：
影响因子：
4.2
通讯作者：
Jae-Hun Kim;I. Sakaguchi;S. Hishita;Taku T. Suzuki;N. Saito
中科院分区：
文献类型：
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作者：
Jae-Hun Kim;I. Sakaguchi;S. Hishita;Taku T. Suzuki;N. Saito
我们设计了一种新的三元结构，以增强基于 WS2 纳米片 (NS) 的气体传感器在室温 (RT) 下自加热模式下的传感性能。将 SnO2 纳米线（NW，10-30 wt%）添加到 WS2 NS 中，然后通过紫外线照射将金纳米颗粒 (NP) 沉积在所得复合材料的表面上。 Au 装饰的 10 wt% SnO2-WS2 组合物表现出最高的气敏性能。 WS2 NS 上 SnO2 NW 的存在有效地增强了气体物质向气体传感器更深部分的扩散和吸附。此外，Au 的化学敏化作用（氧离子吸附的增加；对 CO 的溢出效应和催化效应）有助于增强对 CO 气体的响应。在自加热模式下进行的气体传感测试证明了基于金装饰的 10 wt% SnO2-WS2 实现低电压、低功耗 CO 气体传感器的可能性。传感器在60%相对湿度（RH）条件下的响应是干燥条件下的84%，这表明在室温操作的潮湿环境中CO传感是可能的。
We have designed a new ternary structure to enhance the sensing properties of WS2 nanosheet (NS)-based gas sensors at room temperature (RT) in self-heating mode. SnO2 nanowires (NWs, 10–30 wt%) were added to WS2 NSs and then Au nanoparticles (NPs) were deposited on the surface of the resulting composites by UV irradiation. The Au-decorated 10 wt% SnO2–WS2 composition showed the highest gas sensing properties. The presence of SnO2 NWs on the WS2 NSs effectively enhanced the diffusion and adsorption of gas species into deeper parts of the gas sensor. Furthermore, the chemical sensitization of Au (increase in oxygen ionosorption; spillover effect and catalytic effect towards CO) contributed to an enhanced response to CO gas. Gas sensing tests performed in the self-heating mode demonstrated the possibility of realizing a low-voltage, low-power-consumption CO gas sensor based on the Au-decorated 10 wt% SnO2–WS2. The sensor response under 60% relative humidity (RH) conditions was 84% of that under dry conditions, which shows that CO sensing is possible in wet environments at room temperature operation.