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

Won Jeong Park, Kyung Jin Choi, Myung Hwa Kim, Bon Hyeong Koo, Jong Lam Lee, Jeong Min Baik

Research output: Contribution to journalArticlepeer-review

63 Scopus citations


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.

Original languageEnglish
Pages (from-to)6802-6807
Number of pages6
JournalACS Applied Materials and Interfaces
Issue number15
StatePublished - 14 Aug 2013


  • copper oxide
  • electronic nose (E-nose)
  • junctions array
  • metal-oxides
  • nanowire
  • zinc oxide


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