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.

1. 서 론
 2. 실험 방법
 3. 결과 및 고찰
 4. 결 론
 Acknowledgements
 References

• 김종우(연세대학교 신소재공학과) | Jong-Woo Kim (Department of Materials Science and Engineering, Yonsei University)
• 김도훈(연세대학교 신소재공학과) | Do Hoon Kim (Department of Materials Science and Engineering, Yonsei University)
• 기태훈(연세대학교 신소재공학과) | Tae Hoon Ki (Department of Materials Science and Engineering, Yonsei University)
• 박정혁(연세대학교 신소재공학과) | Jung Hyuk Park (Department of Materials Science and Engineering, Yonsei University)
• 명재민(연세대학교 신소재공학과) | Jae-Min Myoung (Department of Materials Science and Engineering, Yonsei University) Corresponding author