Abstract
ABSTRACT: A mesoporous composite of single-walled carbon nanotube-doped ionic liquid/sol–gel titania/Nafion has been used for the fabrication of a highly sensitive electrochemical sensor for bisphenol A. Four ionic liquids with varying hydrophobicity, 1-butyl-3-methylimidazolium, 1-ethyl-3-methylimidazolium, 1,3-dimethoxy-2-methylimidazolium, and 1-benzyl-3-methylimidazolium hexafluorophosphates, were incorporated into the composite films. Although the composite-modified electrode with 1-butyl-3-methylimidazolium hexafluorophosphate exhibited the largest voltammetric response, the incorporation of ionic liquids, regardless of the type, into the composite-modified electrodes increased the electron transfer ability of the composite due to the high conductivity of ionic liquids and accumulated bisphenol A on the electrode surface due to π–π interactions between aromatic rings of bisphenol A and imidazole groups of the ionic liquids. Therefore, the combination of ionic liquid and electrocatalytically active single-walled carbon nanotube in the composite film provided excellent analytical performance compared to other electrochemical sensors for bisphenol A. Under the optimized conditions, the electrochemical sensor provided a linear response to bisphenol A from 1.0 × 10−9 to 1.0 × 10−5 M with a detection limit of 5.0 × 10−10 M. The sensor was selective to the analyte and also exhibited good reproducibility, with a relative standard deviation of 3.5%.
| Original language | English |
|---|---|
| Pages (from-to) | 2018-2030 |
| Number of pages | 13 |
| Journal | Analytical Letters |
| Volume | 49 |
| Issue number | 13 |
| DOIs | |
| Publication status | Published - 2016 Sep 1 |
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All Science Journal Classification (ASJC) codes
- Analytical Chemistry
- Biochemistry
- Spectroscopy
- Clinical Biochemistry
- Biochemistry, medical
- Electrochemistry
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Electrochemical Determination of Bisphenol A by Single-Walled Carbon Nanotube Composite Glassy Carbon Electrode. / Jang, Junho; Kim, Dong Hwan; Lee, Won Yong.
In: Analytical Letters, Vol. 49, No. 13, 01.09.2016, p. 2018-2030.Research output: Contribution to journal › Article
TY - JOUR
T1 - Electrochemical Determination of Bisphenol A by Single-Walled Carbon Nanotube Composite Glassy Carbon Electrode
AU - Jang, Junho
AU - Kim, Dong Hwan
AU - Lee, Won Yong
PY - 2016/9/1
Y1 - 2016/9/1
N2 - ABSTRACT: A mesoporous composite of single-walled carbon nanotube-doped ionic liquid/sol–gel titania/Nafion has been used for the fabrication of a highly sensitive electrochemical sensor for bisphenol A. Four ionic liquids with varying hydrophobicity, 1-butyl-3-methylimidazolium, 1-ethyl-3-methylimidazolium, 1,3-dimethoxy-2-methylimidazolium, and 1-benzyl-3-methylimidazolium hexafluorophosphates, were incorporated into the composite films. Although the composite-modified electrode with 1-butyl-3-methylimidazolium hexafluorophosphate exhibited the largest voltammetric response, the incorporation of ionic liquids, regardless of the type, into the composite-modified electrodes increased the electron transfer ability of the composite due to the high conductivity of ionic liquids and accumulated bisphenol A on the electrode surface due to π–π interactions between aromatic rings of bisphenol A and imidazole groups of the ionic liquids. Therefore, the combination of ionic liquid and electrocatalytically active single-walled carbon nanotube in the composite film provided excellent analytical performance compared to other electrochemical sensors for bisphenol A. Under the optimized conditions, the electrochemical sensor provided a linear response to bisphenol A from 1.0 × 10−9 to 1.0 × 10−5 M with a detection limit of 5.0 × 10−10 M. The sensor was selective to the analyte and also exhibited good reproducibility, with a relative standard deviation of 3.5%.
AB - ABSTRACT: A mesoporous composite of single-walled carbon nanotube-doped ionic liquid/sol–gel titania/Nafion has been used for the fabrication of a highly sensitive electrochemical sensor for bisphenol A. Four ionic liquids with varying hydrophobicity, 1-butyl-3-methylimidazolium, 1-ethyl-3-methylimidazolium, 1,3-dimethoxy-2-methylimidazolium, and 1-benzyl-3-methylimidazolium hexafluorophosphates, were incorporated into the composite films. Although the composite-modified electrode with 1-butyl-3-methylimidazolium hexafluorophosphate exhibited the largest voltammetric response, the incorporation of ionic liquids, regardless of the type, into the composite-modified electrodes increased the electron transfer ability of the composite due to the high conductivity of ionic liquids and accumulated bisphenol A on the electrode surface due to π–π interactions between aromatic rings of bisphenol A and imidazole groups of the ionic liquids. Therefore, the combination of ionic liquid and electrocatalytically active single-walled carbon nanotube in the composite film provided excellent analytical performance compared to other electrochemical sensors for bisphenol A. Under the optimized conditions, the electrochemical sensor provided a linear response to bisphenol A from 1.0 × 10−9 to 1.0 × 10−5 M with a detection limit of 5.0 × 10−10 M. The sensor was selective to the analyte and also exhibited good reproducibility, with a relative standard deviation of 3.5%.
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U2 - 10.1080/00032719.2015.1134560
DO - 10.1080/00032719.2015.1134560
M3 - Article
VL - 49
SP - 2018
EP - 2030
JO - Analytical Letters
JF - Analytical Letters
SN - 0003-2719
IS - 13
ER -