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Sensors 2009, 9(1), 86-101; doi:10.3390/s90100086
Article

Preparation of Surface Adsorbed and Impregnated Multi-walled Carbon Nanotube/Nylon-6 Nanofiber Composites and Investigation of their Gas Sensing Ability

1
,
2
 and
1,2,3,*
1 Department of Mechanical Engineering, National University of Singapore, 2 Engineering Drive 1, Singapore 117576 2 Nanoscience and Nanotechnology Initiative, National University of Singapore, 2 Engineering Drive 3, Singapore 117576 3 Division of Bioengineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576
* Author to whom correspondence should be addressed.
Received: 19 November 2008 / Revised: 12 December 2008 / Accepted: 22 December 2008 / Published: 6 January 2009
(This article belongs to the Special Issue Gas Sensors 2009)
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Abstract

We have prepared electrospun Nylon-6 nanofibers via electrospinning, and adsorbed multi-walled carbon nanotubes (MWCNTs) onto the surface of Nylon-6 fibers using Triton® X-100 to form a MWCNTs/Nylon-6 nanofiber composite. The dispersed MWCNTs have been found to be stable in hexafluoroisopropanol for several months without precipitation. A MWCNTs/Nylon-6 nanofiber composite based chemical sensor has demonstrated its responsiveness towards a wide range of solvent vapours at room temperature and only mg quantities of MWCNTs were expended. The large surface area and porous nature of the electrospun Nylon-6/MWCNT nanofibers facilitates greater analyte permeability. The experimental analysis has indicated that the dipole moment, functional group and vapour pressure of the analytes determine the magnitude of the responsiveness.
Keywords: Porosity; electrospinning; nanofibers; dispersion; one dimensional material; surface functionalization Porosity; electrospinning; nanofibers; dispersion; one dimensional material; surface functionalization
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Lala, N.L.; Thavasi, V.; Ramakrishna, S. Preparation of Surface Adsorbed and Impregnated Multi-walled Carbon Nanotube/Nylon-6 Nanofiber Composites and Investigation of their Gas Sensing Ability. Sensors 2009, 9, 86-101.

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