Document Detail


Nanoporous PtAg and PtCu alloys with hollow ligaments for enhanced electrocatalysis and glucose biosensing.
MedLine Citation:
PMID:  21778046     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Nanoporous silver (NPS) and copper (NPC) obtained by dealloying AgAl and CuAl alloys, respectively, were used as both three-dimensional templates and reducing agents for the fabrication of nanoporous PtAg (NPS-Pt) and PtCu (NPC-Pt) alloys with hollow ligaments by a simple galvanic replacement reaction with H(2)PtCl(6). Electron microscopy and X-ray diffraction characterizations demonstrate that NPS and NPC with similar ligament sizes (30-50 nm) have different effects on the formed hollow nanostructures. For NPS-Pt, the shell of the hollow ligament is seamless. However, the shell of NPC-Pt is comprised of small pores and alloy nanoparticles with a size of ∼3 nm. The as-prepared NPS-Pt and NPC-Pt exhibit remarkably improved electrocatalytic activities towards the oxidation of ethanol and H(2)O(2) compared with state-of-the-art Pt/C catalyst, and can be used for sensitive electrochemical sensing applications. The hierarchical nanoporous structure also provides a good microenvironment for enzymes. After immobilization of glucose oxidase (GOx), the enzyme modified nanoporous electrode can sensitively detect glucose in a wide linear range (0.6-20 mM).
Authors:
Caixia Xu; Yunqing Liu; Fa Su; Aihua Liu; Huajun Qiu
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2011-07-07
Journal Detail:
Title:  Biosensors & bioelectronics     Volume:  27     ISSN:  1873-4235     ISO Abbreviation:  Biosens Bioelectron     Publication Date:  2011 Sep 
Date Detail:
Created Date:  2011-08-05     Completed Date:  2011-12-07     Revised Date:  2012-02-21    
Medline Journal Info:
Nlm Unique ID:  9001289     Medline TA:  Biosens Bioelectron     Country:  England    
Other Details:
Languages:  eng     Pagination:  160-6     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 Elsevier B.V. All rights reserved.
Affiliation:
School of Chemistry and Chemical Engineering, University of Jinan, Jinan, China. chm_xucx@ujn.edu.cn
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MeSH Terms
Descriptor/Qualifier:
Alloys / chemistry*
Biosensing Techniques*
Catalysis
Copper / chemistry*
Enzymes, Immobilized / chemistry
Glucose / analysis*
Glucose Oxidase / chemistry
Microscopy, Electron
Nanopores / ultrastructure*
Platinum / chemistry*
Silver / chemistry*
X-Ray Diffraction
Chemical
Reg. No./Substance:
0/Alloys; 0/Enzymes, Immobilized; 50-99-7/Glucose; 7440-06-4/Platinum; 7440-22-4/Silver; 7440-50-8/Copper; EC 1.1.3.4/Glucose Oxidase
Comments/Corrections
Erratum In:
Biosens Bioelectron. 2012 Feb 15;32(1):314

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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