期刊
ELECTROCHIMICA ACTA
卷 135, 期 -, 页码 121-127出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.04.135
关键词
Titanate nanofibers; Nanocrystalline Bi2S3; Electroactive nanocomposites; Ascorbic acid oxidation; Electrochemical sensors
资金
- Fundacao para a Ciencia e Tecnologia (FCT) [PTDC/CTM-NAN/113021/2009, SFRH/BPD/77404/2011, PEst-OE/QUI/UI0612/2013]
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/77404/2011] Funding Source: FCT
Here is described a new method for titanate nanofibers (TNF) modification with nanocrystalline semiconducting bismuth sulphide (Bi2S3) nanoparticles in order to obtain new materials with innovative electrocatalytic properties. The TNF surface modification was achieved by in situ nucleation and growth of nanocrystalline metal sulphide particles through a single-source approach. Using bismuth diethyldithiocarbamate complex as the metal chalcogenide precursor, nanocrystalline of Bi2S3 particles were obtained over the TNF surface. The prepared materials were characterized and the results evidence that a thin layer of crystalline Bi2S3 nanosheets is covering the TNF' entire surface. After immobilization on a glassy carbon electrode, the nanocomposite structured surface was electrochemically characterized. The ability of the modified electrodes for sensor applications was tested towards the electrocatalysis for the ascorbic acid oxidation reaction. The results obtained indicate that these are very interesting materials to be used for sensing at pH 7, displaying a vitamin C linear response in the 1-10 mM concentration range. (C) 2014 Elsevier Ltd. All rights reserved.
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