Properties of Urchin-Structured Zinc Oxide nanorods gas sensor by using polystyrene sphere array

Jong Woo Kim, Do Hoon Kim, Tae Hoon Ki, Jung Hyuk Park, Jae Min Myoung

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1 Citation (Scopus)


Urchin-structured zinc oxide(ZnO) nanorod(NR) gas sensors were successfully demonstrated on a polyimide(PI) substrate, using single wall carbon nanotubes(SWCNTs) as the electrode. The ZnO NRs were grown with ZnO shells arranged at regular intervals to form a network structure with maximized surface area. The high surface area and numerous junctions of the NR network structure was the key to excellent gas sensing performance. Moreover, the SWCNTs formed a junction barrier with the ZnO which further improved sensor characteristics. The fabricated urchin-structured ZnO NR gas sensors exhibited superior performance upon NO2 exposure with a stable response of 110, fast rise and decay times of 38 and 24 sec, respectively. Comparative analyses revealed that the high performance of the sensors was due to a combination of high surface area, numerous active junction points, and the use of the SWCNTs electrode. Furthermore, the urchin-structured ZnO NR gas sensors showed sustainable mechanical stability. Although degradation of the devices progressed during repeated flexibility tests, the sensors were still operational even after 10000 cycles of a bending test with a radius of curvature of 5 mm.

Original languageEnglish
Pages (from-to)658-663
Number of pages6
JournalKorean Journal of Materials Research
Issue number12
Publication statusPublished - 2017 Dec 1

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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