Journal
LANGMUIR
Volume 27, Issue 16, Pages 10295-10301Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la201691c
Keywords
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Funding
- Young Program of Anhui Province [2010SQRL179]
- National Basic Research Program of China [2011CB933700]
- National Natural Science Foundation of China [21075001, 20875004]
- Chinese Academy of Sciences, China
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Electrochemical detection of p-nitrophenol (P-NP) using a highly sensitive and selective platform based on single-walled carbon nanotube/pyrenecyclodextrin (SWCNT/PyCD) nanohybrids is described for the first time. The electrochemical performance of the SWCNT/PyCD nanohybrid electrode was fully compared with bare glassy carbon, single-SWCNT, single-PyCD, and SWCNT/CD (without pyrene rings) electrodes. Besides the techniques of cyclic voltammetry and chronoamperometric transients, differential pulse voltammetry (DPV) has been used for the detection of P-NP without any interference from o-nitrophenol (O-NP) at the potentials of -0.80 and -0.67 V, respectively. The SWCNT/PyCD nanohybrid electrode is highly sensitive, and it shows an ultrahigh sensitivity of 18.7 mu A/mu M toward P-NP in contrast to the values reported previously. The detection limit (S/N=3) of the SWCNT/PyCD nanohybrid electrode toward P-NP is 0.00086 mu M (0.12 ppb), which is well below the allowed limit in drinking water, 0.43 mu M, given by the U.S. Environmental Protection Agency (EPA). The analytical performance of the SWCNT/PyCD nanohybrid electrode toward P-NP is superior to the existing electrodes.
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