Self-Assembled and Highly Selective Sensors Based on Air-Bridge-Structured Nanowire Junction Arrays
- 주제(키워드) electronic nose (E-nose) , metal-oxides , nanowire , copper oxide , zinc oxide , junctions array
- 등재 SCIE, SCOPUS
- 발행기관 AMER CHEMICAL SOC
- 발행년도 2013
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000086975
- 본문언어 영어
- Published As http://dx.doi.org/10.1021/am401635e
초록/요약
We describe a strategy for creating an air-bridge-structured nanowire junction array platform that capable of reliably discriminating between three gases (hydrogen, carbon monoxide, and nitrogen dioxide) in air. Alternatively driven dual nanowire species of ZnO and CuO with the average diameter of similar to 30 nm on a single substrate are used and decorated with metallic nanoparticles to form two-dimensional microarray, which do not need to consider the post fabrications. Each individual nanowires in the array form n-n, p-p, and p-n junctions at the micro/nanoscale on single substrate and the junctions act as electrical conducting path for carriers. The adsorption of gas molecules to the surface changes the potential barrier height formed at the junctions and the carrier transport inside the straight semiconductors, which provide the ability of a given sensor array to differentiate among the junctions. The sensors were tested for their ability to distinguish three gases (H-2, CO, and NO2), which they were able to do unequivocally when the data was classified using linear discriminant analysis.
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