Jae-eun Jung

Effect of Ion Bombardment on Microstructures of Carbon Nanotubes Grown by Electron Cyclotron Resonance Chemical Vapor Deposition at Low Temperatures

Vertically aligned multi walled carbon nanotubes (MWNTs) were synthesized by electron cyclotron resonance chemical vapor deposition on Ni-coated glass substrates at temperatures as low as 400°C. Negative self-biases were applied to the substrates by radio-frequency (RF) plasma for ion bombardment of the growing surface. It was observed that ion bombardment by RF biasing to the substrates had a great effect upon the growth of carbon nanotubes and their morphologies. High-resolution transmission electron microscopy revealed that the degree of ordering of graphene layers in the synthesized nanotubes increased with RF bias. Raman spectroscopic analyses indicated that the shortening of C–C bonds within the graphene layers of the MWNTs occurred at larger negative biases, which seemed to result from removal of bonded hydrogen from the MWNTs by ion bombardment.

Non‐invasive Transdermal Delivery Route Using Electrostatically Interactive Biocompatible Nanocapsules

This study was supported by a grant of the Korea Health 21 R&D Project, Ministry of Health & Welfare, Republic of Korea (03-PJ1-PG1-CH14-0001).

Effect of Catalytic Layer Thickness on Growth and Field Emission Characteristics of Carbon Nanotubes Synthesized at Low Temperatures Using Thermal Chemical Vapor Deposition

The direct synthesis of carbon nanotubes (CNTs) on substrates by chemical vapor deposition (CVD) is a highly promising route for their application to field emission displays. Several stringent requirements have to be met for this purpose, including low-temperature growth below 600°C to utilize glass substrates and large-area deposition for practical use. In this study, we carried out the synthesis of CNTs by thermal CVD on glass substrates at temperatures as low as 500–550°C. CNTs were grown by thermal decomposition of CO and H2 gases at atmospheric pressure for different thicknesses of Invar (Fe–Ni–Co alloy) catalytic layers. The CNT growth was strongly correlated with the preparation conditions of the catalytic layers. The diameters and heights of as-grown CNTs increased with the catalytic layer thickness from 2 nm to 30 nm. Measurements of the field emission properties of the CNTs showed that the threshold electric fields decreased with increasing thickness of the catalytic layers. Uniform electron emission was observed over a large area of 150×150 mm2 with high emission current and high brightness.

40.3: 4.8 inch QVGA Color Reflective AM‐PDLCD Driven by Printed OFETs

We have developed polymer-dispersed liquid crystal display (PDLCD) driven by ink-jet printed OFET. Novel pixel design and cell architecture are proposed to obtain enough current to drive PDLCD and high aperture ratio. 4.8 inch color reflective display has been fabricated successfully with the reflectivity of 18 % and contrast ratio of 4:1.