title: Composition-selective fabrication of ordered intermetallic Au-Cu nanowires and their application to nano-size electrochemical glucose detection.
abstract: Bimetallic nanostructures can provide distinct and improved physicochemical properties by the coupling effect of the two metal components, making them promising materials for a variety of applications. Herein, we report composition-selective fabrication of ordered intermetallic Au-Cu nanowires (NWs) by two-step chemical vapor transport method and their application to nano-electrocatalytic glucose detection. Ordered intermetallic Au3Cu and AuCu3 NWs are topotaxially fabricated by supplying Cu-containing chemicals to pre-synthesized single-crystalline Au NW arrays. The composition of fabricated Au-Cu NWs can be selected by changing the concentration of Cu-containing species. Interestingly, Au3Cu NW electrodes show unique electrocatalytic activity for glucose oxidation, allowing us to detect glucose without interference from ascorbic acid. Such interference-free detection of glucose is attributed to the synergistic effect, induced by incorporation of Cu in Au. We anticipate that Au3Cu NWs could show possibility as efficient nano-size electrochemical glucose sensors and the present fabrication method can be employed to fabricate valuable ordered intermetallic nanostructures.
authors.affiliation: Department of Chemistry, KAIST, Daejeon 305-701, Korea.
authors.forename: Si-In
authors.initials: SI
authors.lastname: Kim
authors.forename: Gayoung
authors.initials: G
authors.lastname: Eom
authors.forename: Mijeong
authors.initials: M
authors.lastname: Kang
authors.forename: Taejoon
authors.initials: T
authors.lastname: Kang
authors.forename: Hyoban
authors.initials: H
authors.lastname: Lee
authors.forename: Ahreum
authors.initials: A
authors.lastname: Hwang
authors.forename: Haesik
authors.initials: H
authors.lastname: Yang
authors.forename: Bongsoo
authors.initials: B
authors.lastname: Kim
mesh_terms: D015374:Biosensing Techniques; D003300:Copper / Q000737:chemistry*; D055664:Electrochemical Techniques; D005947:Glucose / Q000737:chemistry; D006046:Gold / Q000737:chemistry*; D053770:Nanowires / Q000737:chemistry*; D010084:Oxidation-Reduction
chemical_list: D006046:Gold; D003300:Copper; D005947:Glucose