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Author

Baik, Jeong Min
Nano Energy and Environmental Materials Lab
Research Interests
  • Nanogenerators, antimicrobial material, catalysis, smart sensors

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Self-assembled and highly selective sensors based on air-bridge-structured nanowire junction arrays

Cited 4 times inthomson ciCited 3 times inthomson ci
Title
Self-assembled and highly selective sensors based on air-bridge-structured nanowire junction arrays
Author
Park, Won JeongChoi, Kyoung JinKim, Myung HwaKoo, Bon HyeongLee, Jong-LamBaik, Jeong Min
Keywords
Electronic nose (e-nose); Linear discriminant analysis; Metal oxides; Metallic nanoparticles; Nanowire junctions; Nitrogen dioxides; Potential barrier height; Selective sensors
Issue Date
201308
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, v.5, no.15, pp.6802 - 6807
Abstract
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 ∼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 (H2, CO, and NO2), which they were able to do unequivocally when the data was classified using linear discriminant analysis.
URI
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DOI
http://dx.doi.org/10.1021/am401635e
ISSN
1944-8244
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