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Citrate-capped platinum nanoparticle as a smart probe for ultrasensitive mercury sensing.

An easily prepared platinum nanoparticle (PtNP) probe for the sensitive and selective detection of Hg(2+) ions is developed here. The PtNPs with an average size of approximately 2.5 nm were prepared by a reduction method with sodium borohydride and trisodium citrate serving as reductant and stabiliz... Full description

Journal Title: Analytical chemistry November 4, 2014, Vol.86(21), pp.10955-10960
Main Author: Wu, Gang-Wei
Other Authors: He, Shao-Bin , Peng, Hua-Ping , Deng, Hao-Hua , Liu, Ai-Lin , Lin, Xin-Hua , Xia, Xing-Hua , Chen, Wei
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: E-ISSN: 1520-6882 ; DOI: 1520-6882 ; DOI: 10.1021/ac503544w
Link: http://search.proquest.com/docview/1620586733/?pq-origsite=primo
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recordid: proquest1620586733
title: Citrate-capped platinum nanoparticle as a smart probe for ultrasensitive mercury sensing.
format: Article
creator:
  • Wu, Gang-Wei
  • He, Shao-Bin
  • Peng, Hua-Ping
  • Deng, Hao-Hua
  • Liu, Ai-Lin
  • Lin, Xin-Hua
  • Xia, Xing-Hua
  • Chen, Wei
subjects:
  • Citrates–Chemistry
  • Limit of Detection–Analysis
  • Mercury–Chemistry
  • Metal Nanoparticles–Chemistry
  • Microscopy, Electron, Transmission–Chemistry
  • Platinum–Chemistry
  • Citrates
  • Platinum
  • Mercury
ispartof: Analytical chemistry, November 4, 2014, Vol.86(21), pp.10955-10960
description: An easily prepared platinum nanoparticle (PtNP) probe for the sensitive and selective detection of Hg(2+) ions is developed here. The PtNPs with an average size of approximately 2.5 nm were prepared by a reduction method with sodium borohydride and trisodium citrate serving as reductant and stabilizer, respectively. The resulting PtNPs could catalyze the reduction of Hg(2+) by surface-capping citrate. The effect of Hg(2+) uptake implies amalgam formation, which leads to remarkable inhibition of the peroxidase-like activity of citrate-capped PtNPs. On the basis of this effect, a colorimetric mercury sensor was established through the use of citrate-capped PtNPs to catalyze the colorimetric system of 3,3',5,5'-tetramethylbenzidine (TMB) and H2O2. The high specificity of the Hg-Pt interaction provides the excellent selectivity for Hg(2+) over interfering metal ions. The sensitivity of this smart probe to Hg(2+) is extremely excellent with a limit of detection (LOD) as low as 8.5 pM. In view of these advantages, as well as the cost-effectiveness, minimized working steps, and naked-eye observation, we expect that this colorimetric sensor will be a promising candidate for the field detection of toxic Hg(2+) ions in environmental, biological, and food samples.
language: eng
source:
identifier: E-ISSN: 1520-6882 ; DOI: 1520-6882 ; DOI: 10.1021/ac503544w
fulltext: no_fulltext
issn:
  • 15206882
  • 1520-6882
url: Link


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titleCitrate-capped platinum nanoparticle as a smart probe for ultrasensitive mercury sensing.
creatorWu, Gang-Wei ; He, Shao-Bin ; Peng, Hua-Ping ; Deng, Hao-Hua ; Liu, Ai-Lin ; Lin, Xin-Hua ; Xia, Xing-Hua ; Chen, Wei
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subjectCitrates–Chemistry ; Limit of Detection–Analysis ; Mercury–Chemistry ; Metal Nanoparticles–Chemistry ; Microscopy, Electron, Transmission–Chemistry ; Platinum–Chemistry ; Citrates ; Platinum ; Mercury
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descriptionAn easily prepared platinum nanoparticle (PtNP) probe for the sensitive and selective detection of Hg(2+) ions is developed here. The PtNPs with an average size of approximately 2.5 nm were prepared by a reduction method with sodium borohydride and trisodium citrate serving as reductant and stabilizer, respectively. The resulting PtNPs could catalyze the reduction of Hg(2+) by surface-capping citrate. The effect of Hg(2+) uptake implies amalgam formation, which leads to remarkable inhibition of the peroxidase-like activity of citrate-capped PtNPs. On the basis of this effect, a colorimetric mercury sensor was established through the use of citrate-capped PtNPs to catalyze the colorimetric system of 3,3',5,5'-tetramethylbenzidine (TMB) and H2O2. The high specificity of the Hg-Pt interaction provides the excellent selectivity for Hg(2+) over interfering metal ions. The sensitivity of this smart probe to Hg(2+) is extremely excellent with a limit of detection (LOD) as low as 8.5 pM. In view of these advantages, as well as the cost-effectiveness, minimized working steps, and naked-eye observation, we expect that this colorimetric sensor will be a promising candidate for the field detection of toxic Hg(2+) ions in environmental, biological, and food samples.
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