Micropatterning of biomolecules

• Main Author: Yap, Annette Hui Yu.
• Other Authors: Zhang Hua
• Format: Final Year Project
• Language: English
• Published: 2010
• Subjects: DRNTU::Engineering::Materials::Nanostructured materials
• Online Access: http://hdl.handle.net/10356/38790
• Institution: Nanyang Technological University

Carbon nanotubes (CNT) is the recent star material in the field of electronics such as electrodes, filed-effect transistors (FETs) and sensors due to its unique structure and properties including low resistivity, high current carrying capabilities and high thermal conductivities. In particular, transistors employing CNT as conducting channels are highly sensitive to its local environment, rendering CNT a promising material for chemical and biological sensors. For the successful integration of CNT into a transistor, first of all the line form by CNT has to be continuous and aligned so that current would be able to flow through. This research report provides a state-of-the-art investigation of micropatterning of single walled carbon nanotubes (SWNT) on various substrates including silica chips, quartz and flexible polymer using microfluidics. The resulting patterns of SWNT are continuous on a large scale with certain alignment. Also, the possibility to directly generate SWNT pattern on flexible substrates are of great importance since flexible electronics are highly desirable. Drain and source electrodes were made by manually attaching silver paint on both ends of the arrays of SWNT micropatterns. FET devices were successfully made on both hard and soft substrates and showed typical p-type characteristics with an on/off ratio over 1000.