title: Ultralow Pt-loading bimetallic nanoflowers: fabrication and sensing applications.
abstract: Ultralow Pt-loading Au nanoflowers (AuNFs) were synthesized on a glassy carbon electrode surface by the underpotential deposition (UPD) monolayer redox replacement technique, which involves redox replacement of a copper UPD monolayer by PtCl(4)(2-) that can be reduced and deposited simultaneously. Field-emission scanning electron microscopy, energy dispersive spectroscopy, x-ray photoelectron spectroscopy and the electrochemical method were utilized to characterize the ultralow Pt-loading AuNFs. Cyclic voltammogram results showed that the ultralow Pt-loading AuNFs exhibited excellent electrocatalytic activity towards the reduction of hydrogen peroxide and the oxidation of glucose in neutral media, and the reaction pathway of glucose oxidation was changed from an intermediate process based on the electrosorption of glucose to a direct oxidation process. From chronoamperometric results, it could be obtained that this prepared biosensor had wide linear ranges and very low detection limits (DLs) for H(2)O(2) (0.025-94.3 μM; DL = 0.006 μM) and glucose (0.0028-8.0 mM; DL = 0.8 μM), which were much better than previous results.
authors.affiliation: College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, People's Republic of China.
authors.forename: Qingqing
authors.initials: Q
authors.lastname: Wu
authors.forename: Yongxin
authors.initials: Y
authors.lastname: Li
authors.forename: Hongying
authors.initials: H
authors.lastname: Xian
authors.forename: Chaodi
authors.initials: C
authors.lastname: Xu
authors.forename: Lun
authors.initials: L
authors.lastname: Wang
authors.forename: Zhibing
authors.initials: Z
authors.lastname: Chen
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation*; D003217:Conductometry / Q000295:instrumentation*; D003460:Crystallization / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005947:Glucose / Q000032:analysis / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000032:analysis* / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D008832:Microchemistry / Q000295:instrumentation*; D010316:Particle Size; D010984:Platinum / Q000737:chemistry*
chemical_list: D010984:Platinum; D006861:Hydrogen Peroxide; D005947:Glucose