期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 226, 期 -, 页码 44-51出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2015.11.123
关键词
Bare gold nanoparticles; Cr3+; Colorimetric sensor; Real sample analysis
资金
- Ministry of Science and Technology of Taiwan [MOST 103-2811-M-009-070, MOST 102-2112-M-009-011-MY3]
Facile bare gold nanoparticles (AuNPs) were synthesized via borohydride reduction method and evidenced the colorimetric sensor selectivity to Cr3+ ions among Na+, Ni2+, Fe3+, Cd2+, Cr3+, Cu2+, Ca2+, Mg2+, Ga3+, Fe2+, Ba2+, Al3+ Ag+, Co2+, Zn2+, Pb2+, Mn2+ and Hg2+ ions. The color of bare AuNPs changed rapidly from red to blue via Cr3+ induced aggregation. These Cr3+-induced aggregation of bare AuNPs were monitored by naked eye and using UV-vis spectroscopy. The SPR absorbance (654 nm) of the reaction between bare AuNPs and Cr3+ showed a good linearity with a low detection limit of 13.42 nM. The optimal detection of Cr3+ was achieved between pH ranges from 5 to 11 and its reversibility was well established with EDTA. In addition, the bare AuNPs which were successfully applied for the detection of Cr3+ in tap and lake water displays low interference. (C) 2015 Elsevier B.V. All rights reserved.
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