A lab-on-a-chip device using a dielectrophoresis-aligned carbon nanotube sensor array

Pengfei Li, Nan Lei, Jie Xu, Wei Xue

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Here we report the design, fabrication, and characterization of a lab-on-a-chip device using a nanotube-based sensor array. The microfluidic components are composed of an ultraviolet (UV) light-defined, cross-linked SU-8 microchannel and a polydimethylsiloxane (PDMS) top cover. The hybrid microfluidic structure provides a fully sealed microchannel, well-aligned features, and precisely positioned nanosensors. Well-organized single-walled carbon nanotube (SWNT) thin films are deposited and aligned across the electrodes on a silicon substrate with dielectrophoresis. The assembly of SWNTs is carried out in a sealed microchannel. The SWNT devices are configured as two-terminal resistor-type sensors with the metal electrodes as the probing pads and the dielectrophoretically captured SWNTs as the sensing elements. The SWNT devices are used as integrated flow sensors to monitor the flow rate in the microchannel. In addition, when exposed to aqueous solutions with various pH values, these sensors change their resistance accordingly and demonstrate high sensitivity towards pH solutions.

Original languageEnglish (US)
Title of host publicationASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011
Pages923-929
Number of pages7
Publication statusPublished - Dec 1 2011
EventASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011 - Denver, CO, United States
Duration: Nov 11 2011Nov 17 2011

Publication series

NameASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011
Volume2

Other

OtherASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011
CountryUnited States
CityDenver, CO
Period11/11/1111/17/11

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All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

Cite this

Li, P., Lei, N., Xu, J., & Xue, W. (2011). A lab-on-a-chip device using a dielectrophoresis-aligned carbon nanotube sensor array. In ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011 (pp. 923-929). (ASME 2011 International Mechanical Engineering Congress and Exposition, IMECE 2011; Vol. 2).