Low-temperature and highly selective NO-sensing performance of WO3 nanoplates decorated with silver nanoparticles
Low-temperature and highly selective NO-sensing performance of WO3 nanoplates decorated with silver nanoparticles
复制标题
纳米银修饰WO3纳米板的低温高选择性NO传感性能
DOI：
10.1016/j.snb.2013.05.006
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发表时间：
2013-08-01
影响因子：
8.4
通讯作者：
Shao, Guosheng
中科院分区：
文献类型：
--
作者：
Chen, Deliang;Yin, Li;Shao, Guosheng
为了提高基于 WO3 的传感器的低温响应和选择性，银纳米颗粒 (AgNP) 已被用来修饰 WO3 纳米板。通过在 WO3 纳米板上生长 AgNP，合成了具有不同数量 AgNP 的 Ag@plate-WO3 纳米复合材料。使用 XRD、SEM、TEM 和 XPS 光谱对 Ag@plate-WO3 样品进行表征。气敏特性在室温下评估。 -250 摄氏度，使用不同浓度 (0.5-50 ppm) 的 NO 气体。 AgNPs增强了Ag@plate-WO3传感器对NO检测的低温响应和选择性，并且AgNPs的量影响Ag@plate-WO3传感器的NO传感性能。含有 0.5% AgNP 的样品显示出最佳性能。其最佳工作温度约为 170 摄氏度，但即使在室温下也能表现出响应。 Ag@plate-WO3传感器对NO气体、各种气体（即H-2和CO）和有机蒸气（即酒精、丙酮、甲醇和苯）具有高选择性响应。 WO3纳米晶的形貌也影响Ag@WO3传感器的NO传感性能，片状WO3样品比颗粒状WO3样品在提高NO传感性能方面更好。 NO 传感增强应该是 AgNP 和板状 WO3 聚集体松散卡屋结构的协同效应的结果。 (C) 2013 Elsevier B.V. 保留所有权利。
For improving the low-temperature response and selectivity of WO3-based sensors, Ag nanoparticles (AgNPs) have been used to modify the WO3 nanoplates. Ag@plate-WO3 nanocomposites with various amounts of AgNPs were synthesized by growing AgNPs on WO3 nanoplates. XRD, SEM, TEM and XPS spectrum were used to characterize the Ag@plate-WO3 samples. The gas-sensing properties were evaluated at r.t. -250 degrees C using NO gases with various concentrations (0.5-50 ppm). AgNPs enhance the low-temperature response and selectivity of the Ag@plate-WO3 sensors for NO detection, and the amounts of AgNPs influence the NO-sensing performance of the Ag@plate-WO3 sensors. The sample with 0.5% AgNPs shows the best performance. Its optimum operating temperature is around 170 degrees C, but it shows response even at room temperature. The Ag@plate-WO3 sensors have a high selective response to NO gas, among various gases (i.e., H-2 and CO) and organic vapors (i.e., alcohol, acetone, methanol and benzene). The morphologies of WO3 nanocrystals also influence the NO-sensing properties of the Ag@WO3 sensors, and the plate-like WO3 samples are better than the particle-like WO3 samples in improving NO-sensing performance. The NO-sensing enhancement should result from the synergistic effects of AgNPs and the loose house-of-card structure of plate-like WO3 aggregates. (C) 2013 Elsevier B.V. All rights reserved.