Issue 8, 2014

A single-walled carbon nanotube thin film-based pH-sensing microfluidic chip

Abstract

A novel microfluidic pH-sensing chip was developed based on pH-sensitive single-walled carbon nanotubes (SWCNTs). In this study, the SWCNT thin film acted both as an electrode and a pH-sensitive membrane. The potentiometric pH response was observed by electronic structure changes in the semiconducting SWCNTs in response to the pH level. In a microfluidic chip consisting of a SWCNT pH-sensing working electrode and an Ag/AgCl reference electrode, the calibration plot exhibited promising pH-sensing performance with an ideal Nernstian response of 59.71 mV pH−1 between pH 3 and 11 (standard deviation of the sensitivity is 1.5 mV pH−1, R2 = 0.985). Moreover, the SWCNT electrode in the microfluidic device showed no significant variation at any pH value in the range of the flow rate between 0.1 and 15 μl min−1. The selectivity coefficients of the SWCNT electrode revealed good selectivity against common interfering ions.

Graphical abstract: A single-walled carbon nanotube thin film-based pH-sensing microfluidic chip

Article information

Article type
Paper
Submitted
05 Dec 2013
Accepted
24 Jan 2014
First published
24 Jan 2014

Analyst, 2014,139, 2011-2015

A single-walled carbon nanotube thin film-based pH-sensing microfluidic chip

C. A. Li, K. N. Han, X. Pham and G. H. Seong, Analyst, 2014, 139, 2011 DOI: 10.1039/C3AN02195E

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