Nonaqueous synthesis of high-purity indium and tin oxide nanocrystals and their application as gas sensors

N. Pinna, A. Bonavita, G. Neri, S. Capone, P. Siciliano, M. Niederberger
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引用次数: 3

Abstract

In this work, a nonaqueous and halide-free synthesis of In/sub 2/O/sub 3/ and SnO/sub 2/ nanoparticles is presented. These materials were carefully characterized by HRTEM and XPD. They exhibit grain sizes on the nanoscale (around 2.5 nm for SnO/sub 2/ and 20 nm for In/sub 2/O/sub 3/) and are well crystallized even at such small size. Using the same approach, also In/sub 2/O/sub 3/-SnO/sub 2/ mixed oxide phases were successfully synthesized. Gas sensors were fabricated using the synthesized nanopowders. The good sensitivity of these sensors was demonstrated by monitoring trace levels of both oxidizing (NO/sub 2/) and reducing gases (CO and CH/sub 4/). The sensors were found to show linearity in a wide range of concentration, rapid response and recovery times.
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高纯氧化铟锡纳米晶的非水合成及其在气体传感器中的应用
本文介绍了一种非水无卤化物合成In/sub 2/O/sub 3/和SnO/sub 2/纳米颗粒的方法。用HRTEM和XPD对材料进行了表征。它们具有纳米级的晶粒尺寸(SnO/sub 2/约为2.5 nm, In/sub 2/O/sub 3/约为20 nm),并且即使在如此小的尺寸下也具有良好的结晶性。采用同样的方法,还成功地合成了In/sub 2/O/sub 3/-SnO/sub 2/混合氧化物相。利用合成的纳米粉体制备了气体传感器。通过监测氧化性(NO/sub - 2/)和还原性气体(CO和CH/sub - 4/)的痕量水平,证明了这些传感器的良好灵敏度。该传感器在较宽的浓度范围、快速的响应和恢复时间内呈线性关系。
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