Phosphinic acid functionalized carbon nanotubes for sensitive and selective sensing of chromium(VI)

Deep, Akash and Sharma , A.L. and Tuteja, S.K. and Paul, A.K. (2014) Phosphinic acid functionalized carbon nanotubes for sensitive and selective sensing of chromium(VI). Journal of Hazardous Materials, 278. pp. 559-565. ISSN 0304-3894

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Official URL: http://www.ncbi.nlm.nih.gov/pubmed/25016454

Abstract

Single-walled carbon nanotubes (SWCNTs) have been functionalized with a phosphinic acid derivative 'bis(2,4,4-trimethylpentyl) phosphinic acid' (PA/d). It has been achieved by treating the chlorinated SWCNTs with PA/d at 80°C. Successful functionalization and different nanomaterial properties have been investigated by UV-vis-NIR, FTIR, Raman spectroscopy, AFM and FE-SEM. PA/d conjugated SWCNTs (CNT-PA) are dispersible in some common organic solvents, e.g. CH2Cl2, DMF, CHCl3, and THF. The 'CNT-PA' complex was spin-casted on boron doped silicon wafer. Thus fabricated sensing electrode is demonstrated for sensitive and selective electrochemical sensing of chromium(VI) ions. A linear response is obtained over a wide range of Cr(VI) concentration (0.01-10 ppb). The sensor's sensitivity and the limit of detection are observed to be 35 ± 4 nA/ppb and 0.01 ppb, respectively. The practical utility of the proposed sensor is demonstrated by determining the Cr(VI) concentration in an industrial effluent sample and an underground water sample.

Item Type: Article
Uncontrolled Keywords: Amperometry; Carbon nanotubes; Cr(VI); Determination; Microsensor; Phosphinic acid modifier
Subjects: CSIO > Nano Science and Nano Technology
Divisions: Nano Science and Nano Technology
Depositing User: Ms. Jyotsana
Date Deposited: 09 Aug 2018 12:03
Last Modified: 09 Aug 2018 12:03
URI: http://csioir.csio.res.in/id/eprint/502

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