title: Fabrication of bimetallic Cu/Au nanotubes and their sensitive, selective, reproducible and reusable electrochemical sensing of glucose.
abstract: Herein, we report a facile two-step approach to produce gold-incorporated copper (Cu/Au) nanostructures through controlled disproportionation of the Cu(+)-oleylamine complex at 220 °C to form copper nanowires and the subsequent reaction with Au(3+) at different temperatures of 140, 220 and 300 °C. In comparison with copper nanowires, these bimetallic Cu/Au nanostructures exhibit their synergistic effect to greatly enhance glucose oxidation. Among them, the shape-controlled Cu/Au nanotubes prepared at 140 °C show the highest electrocatalytic activity for non-enzymatic glucose sensing in alkaline solution. In addition to high sensitivity and fast response, the Cu/Au nanotubes possess high selectivity against interferences from other potential interfering species and excellent reproducibility with long-term stability. By introducing gold into copper nanostructures at a low level of 3, 1 and 0.1 mol% relative to the initial copper precursor, a significant electrocatalytic enhancement of the resulting bimetallic Cu/Au nanostructures starts to occur at 1 mol%. Overall, the present fabrication of stable Cu/Au nanostructures offers a promising low-cost platform for sensitive, selective, reproducible and reusable electrochemical sensing of glucose.
authors.affiliation: Institute of Materials Research and Engineering, Agency for Science, Technology & Research, 3 Research Link, Singapore 117602, Singapore. my-han@imre.a-star.edu.sg.
authors.forename: Si Yin
authors.initials: SY
authors.lastname: Tee
authors.forename: Enyi
authors.initials: E
authors.lastname: Ye
authors.forename: Pei Hua
authors.initials: PH
authors.lastname: Pan
authors.forename: Coryl Jing Jun
authors.initials: CJ
authors.lastname: Lee
authors.forename: Hui Kim
authors.initials: HK
authors.lastname: Hui
authors.forename: Shuang-Yuan
authors.initials: SY
authors.lastname: Zhang
authors.forename: Leng Duei
authors.initials: LD
authors.lastname: Koh
authors.forename: Zhili
authors.initials: Z
authors.lastname: Dong
authors.forename: Ming-Yong
authors.initials: MY
authors.lastname: Han
mesh_terms: D003300:Copper / Q000737:chemistry*; D055664:Electrochemical Techniques / Q000379:methods*; D005947:Glucose / Q000032:analysis*; D006046:Gold / Q000737:chemistry*; D057230:Limit of Detection; D036103:Nanotechnology; D043942:Nanotubes / Q000737:chemistry*; D015203:Reproducibility of Results
chemical_list: D006046:Gold; D003300:Copper; D005947:Glucose