| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 가을 (10/13 ~ 10/14, 제주 ICC) |
| 권호 | 30권 2호 |
| 발표분야 | 탄소나노튜브 및 고분자 복합재료 |
| 제목 | Vertical alignment of single-walled carbon nanotubes using colloidal monolayer as a supporting frame |
| 초록 | The extraordinary promises of single-walled carbon nanotubes (SWNTs) have attracted great attraction for many potential applications such as field emission source, electrochemical devices, molecular sensors4, gas and hydrogen storages, scanning probes, and electronic devices. In particular, academic and industrial research activity on electronic devices has focused on using SWNTs as field emission sources for flat panel display due to the large aspect ratios of SWNTs. A potential applied between a field emitter array (FEA) and an anode produces high local fields, as a result of the small radius of the emitter’s tip and the length of the emitter. These local fields are used to extract electrons from the tips of nanotubes into the vacuum, and the electrons are focused into the anode, where a phosphor produces light. It is essential for the highly effective use of field emission display to fabricate vertically aligned SWNTs on the cathode surface. In this work, we report a novel fabrication method for vertically alignment of single walled carbon nanotubes (SWNTs) by an electric field using a colloidal monolayer as supporting frame. Prior to using colloidal monolayer, a condensation reaction was performed by immersing a modified ITO glass substrate into the well dispersed suspension of end-group functionalized SWNTs with the aid of condensation agent (HATU/DIEA). However, there are no vertically aligned SWNTs on ITO glass substrates due to the large aspect ratio of SWNTs. Without supporting frame, it is impossible to plant SWNTs vertically onto ITO glass substrates. To fabricate vertical alignment of SWNTs, we selected mono-disperse colollidal silica beads as a supporting frame, and have planted SWNTs into the holes between the silica beads forming self-assembled monolayer on ITO glass substrates under the influence of an electric field. The vertically aligned SWNTs in the hoes between the colloids were verified by scanning electron microscopy (SEM). We also show the field emission characteristics of SWNT field emitter array (FEA) thus fabricated. The performance of these FEA compares favorably with those from other technique and allows the possibility of application to a field emission display as emitters. |
| 저자 | 고영관, 정희태 |
| 소속 | 한국과학기술원 생명화학공학과 |
| 키워드 | Carbon nanotube; colloidal assembly; Field emission display |
