Comparison of gas sensor performance of SnO2 nano-structures on microhotplate platforms
Comparison of gas sensor performance of SnO2 nano-structures on microhotplate platforms
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DOI：
10.1016/j.snb.2011.12.045
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发表时间：
2012-04-01
影响因子：
8.4
通讯作者：
Akbar, Sheikh A.
中科院分区：
文献类型：
--
作者：
Andio, Mark A.;Browning, Paul N.;Akbar, Sheikh A.
微热板平台上的金属氧化物纳米结构因其具有制造高响应性和极易携带的气体传感器的潜力而引起了人们对气体传感器研究的极大兴趣。目前对这些传感器的大部分研究都集中在创建分级纳米结构上，因为纳米粒子之间的范德华引力会导致团聚，从而损害传感器的性能。在这篇研究文章中，探索了在微热板上喷墨打印作为一种避免纳米粒子团聚以产生开放的薄膜微结构的方法。利用扫描电子显微镜对沉积的纳米颗粒薄膜进行了研究，薄膜具有开放的微结构，无大团聚。喷墨打印的SnO2纳米颗粒在干燥的空气中暴露在甲烷和一氧化碳中，其传感器响应和响应时间与分级颗粒膜相当。由于纳米结构的比表面积增大，SnO2纳米粒子和微球都具有比SnO2微米级粒子更好的响应能力。这意味着，适当控制SnO2纳米颗粒薄膜的微结构，可以产生与SnO2分级结构类似的气敏性能，并有可能用于可重复制造高性能气敏元件。(C)2012爱思唯尔B.V.保留所有权利。
Metal oxide nano-structures on microhotplate platforms have attracted a great deal of interest in gas sensor research for their potential to create both highly responsive and extremely portable gas sensors. Much of the current research on these sensors has focused upon the creation of hierarchical nanostructures, as van der Waals attraction between nanoparticles leads to agglomeration that impair sensor performance. In this research article, ink-jet printing onto microhotplates was explored as a method of avoiding nanoparticle agglomeration to produce an open film microstructure. Scanning electron microscopy was used to study the deposited thin nanoparticle film featuring an open microstructure free of large agglomeration. Sensor response and response times of ink-jet printed SnO2 nanoparticles were found to be comparable to hierarchical particle films when exposed to methane and carbon monoxide in a background of dry air. Both the SnO2 nanoparticles and microspheres had superior response compared to SnO2 micron-size particles due to increased surface area of the nano-structures. This implies that proper control of the microstructure of the SnO2 nanoparticle films produces similar gas sensor performance to SnO2 hierarchical structures and has the potential for use in reproducibly manufacturing high-performance gas sensors. (C) 2012 Elsevier B.V. All rights reserved.