A single-walled carbon nanotube thin film-based pH-sensing microfluidic chip
- Authors
- Li, Cheng Ai; Han, Kwi Nam; Pham, Xuan-Hung; Seong, Gi Hun
- Issue Date
- Mar-2014
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- ANALYST, v.139, no.8, pp 2011 - 2015
- Pages
- 5
- Indexed
- SCI
SCIE
SCOPUS
- Journal Title
- ANALYST
- Volume
- 139
- Number
- 8
- Start Page
- 2011
- End Page
- 2015
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/25895
- DOI
- 10.1039/c3an02195e
- ISSN
- 0003-2654
1364-5528
- 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), R-2 = 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 mu l min(-1). The selectivity coefficients of the SWCNT electrode revealed good selectivity against common interfering ions.
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