Journal of the Korean Vacuum Society (한국진공학회지)

The Korean Vacuum Society (한국진공학회)
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Characteristics of Electrospun Ag Nanofibers for Transparent Electrodes

전기방사법으로 제조된 Ag 나노섬유의 투명전극 특성

  • Hyeon, Jae-Young (Department of Nano Science & Technology, University of Seoul) ;
  • Choi, Jung-Mi (Department of Nano Science & Technology, University of Seoul) ;
  • Park, Youn-Sun (Department of Industrial and Management Engineering, Myongji University) ;
  • Kang, Jiehun (Department of Nano and Electronic Physics, Kookmin University) ;
  • Sok, Junghyun (Department of Nano Science & Technology, University of Seoul)
  • 현재영 (서울시립대학교 나노과학기술학과) ;
  • 최정미 (서울시립대학교 나노과학기술학과) ;
  • 박윤선 (명지대학교 산업경영공학부) ;
  • 강지훈 (국민대학교 나노전자물리학과) ;
  • 석중현 (서울시립대학교 나노과학기술학과)
  • Received : 2013.03.06
  • Accepted : 2013.05.06
  • Published : 2013.05.30
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Abstract

We fabricated transparent conductive electrodes with silver (Ag) nanofibers by electrospinning process. Ag nanofibers have high aspect ratio and fused junctions which result in low sheet resistance. Electrospinning is a fast and efficient process to fabricate continuous one-dimensional (1D) nanofibers. Ag/polymer ink were prepared in polymer matrix solution by a sol-gel method. Then, Ag/polymer nanofibers precursors are heated at $200{\sim}500^{\circ}C$ in air for 2 h to eliminate partially the polymers. The topographical features of the Ag nanofibers were characterized by FE-SEM, and the electrical property was analyzed through I-V measurement system. Finally, optical property was measured using UV/VIS spectroscopy. The transparent conductive electrodes with Ag nanofibers exhibited a sheet resistance (Rs) of $250{\Omega}/sq$ at a transparency (T) of 83%. Transparent conductive films, contain the Ag nanofibers as conductive materials, have good electrical, optical, and mechanical properties. Therefore, it is expected to be useful for the application of flexible display in the future.

연속적인 1차원의 나노섬유를 제작하는데 빠르고 효과적인 방법인 전기방사법을 이용하여 Ag 나노섬유로 이루어진 투명전극을 제작하고 그 특성을 측정하였다. 전기방사를 통해 제조된 Ag 나노섬유는 큰 종횡비를 갖게 되며 열처리를 통해 생성된 섬유사이의 fused junction이 접촉저항을 낮추어 전기적 특성을 향상시킨다. Ag/고분자 용액을 졸-겔 방법을 이용하여 제조한 후 glass 기판위에 방사시켜 Ag/고분자 나노섬유 구조체를 제작하고 $200{\sim}500^{\circ}C$, 2시간 열처리하여 고분자가 일정부분 제거되고 전도성이 향상된 Ag 나노섬유 투명전극을 제조하였다. Ag 나노섬유의 모폴로지를 FE-SEM을 통해 확인하였고 Ag 나노섬유 투명전극의 투과도와 면저항을 UV-vis-NIR spectroscopy와 I-V특성 측정장치를 사용하여 측정하였다. 투과도 83%에서 면저항 $250{\Omega}/sq$의 투명전극을 제작하였으며 전도성필름에 적합한 수준이다. Ag 나노섬유로 이루어진 투명 전극은 전기적, 광학적, 기계적 특성이 우수하여 차세대 유연 디스플레이에 적용 가능성을 보여준다.

Keywords

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