期刊
CARBON
卷 94, 期 -, 页码 836-844出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2015.07.057
关键词
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资金
- PTT group (PTT Public Company Limited, PTT Exploration & Production, PTT Global Chemical, IRPC Thaioil)
- Commission on Higher Education, Ministry of Education (the National Research University Project of Thailand (NRU)''
- Thailand Research Fund and Kasetsart University [3.C.KU/50/A.1]
- National Science and Technology Development Agency (NANOTEC Center for Nanoscale Materials Design for Green Nanotechnology - National Nanotechnology Center)
- Grants-in-Aid for Scientific Research [26420672] Funding Source: KAKEN
The use of gold nanoparticle/carbon nanotube composite (AuNP/CNT) is of current interest in the development of nanomaterial based sensing and electronic devices. Herein, we demonstrate a novel method to tailor the size of positively charged AuNPs under the influence of two capping agents, polyvinylpyrrolidone (PVP) and 4-dimethylaminopyridine (DMAP). By varying the mole ratios of PVP: DMAP (P:D) from 1:32 to 32:1, the average diameters of AuNPs were progressively decreased from 17.3 nm to 1.8 nm. Therefore, PVP played a dominant role in the formation of small AuNPs. Moreover, these size-controlled AuNPs could be electrostatically deposited onto the anodic aluminum oxide (AAO)-templated CNTs without requiring a pretreatment of the CNT surfaces. The obtained AuNPs/CNTs with different Au core sizes were also compared in terms of electroactivity towards hydrogen peroxide (H2O2) reduction. The greatest voltammetric response was of Au-(P1: D4-10.6 nm)/CNTs caused by their reduced charge transfer resistance from the low covering of PVP on the Au surfaces and by their dense and uniform AuNPs. This modified electrode also provided a wide linearity range for H2O2 detection from 5 mu M to 45.80 mM with the low detection limit of 0.23 mu M (S/N = 3). This study thus suggests the rational design of AuNP/CNT structure for an H2O2 sensor. (C) 2015 Elsevier Ltd. All rights reserved.
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