Towards one key to one lock: catalyst modified indium oxide nanoparticle thin film sensor array for selective gas detection
Towards one key to one lock: catalyst modified indium oxide nanoparticle thin film sensor array for selective gas detection
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DOI：
10.1039/c2jm15179k
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发表时间：
2012-01-01
影响因子：
--
通讯作者：
Zhou, Weilie
中科院分区：
文献类型：
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作者：
Yao, Kun;Caruntu, Daniela;Zhou, Weilie
均匀的In 2 O3纳米粒子（NPs）自组装成薄膜传感器阵列在一个单一的芯片上，与贵金属催化剂的进一步表面改性。当暴露于不同的目标气体时，NP膜传感器阵列显示出清晰的电流响应，并且灵敏度和选择性都大大提高。特别地，用Au、Pd和Pt纳米催化剂修饰的传感器分别对H2S、H2-和CO表现出更高的灵敏度，使得气体区分直接和简单，就像“一把钥匙对一把锁”。通过调节溅射参数，进一步研究了贵金属改性剂对灵敏度的粒度依赖性。观察到三种不同的敏感性趋势，每种趋势归因于不同的机制。在柔性基底上制备了修饰纳米颗粒薄膜传感器，并研究了不同弯曲角度下的传感性能。
Homogeneous In2O3 nanoparticles (NPs) were self-assembled into thin film sensor arrays on a single chip, with further surface modification by noble metal catalysts. The NP film sensor arrays show clear current responses when exposed to different target gases, and both sensitivity and selectivity were greatly improved. Particularly, the sensors modified with Au, Pd, and Pt nanocatalysts demonstrated higher sensitivity to H2S, H-2 and CO, respectively, making the gas discrimination direct and simple, like "one key to one lock". The particle size dependence of the noble metal modifiers to the sensitivity was further investigated by tuning the sputtering parameters. Three different trends of sensitivities were observed, each attributed to different mechanisms. The modified nanoparticle film sensor was also fabricated on flexible substrates and the sensing performance was investigated at different bending angles.