title: Hyper-Branched Cu@Cu2O Coaxial Nanowires Mesh Electrode for Ultra-Sensitive Glucose Detection.
abstract: Electrode design in nanoscale is expected to contribute significantly in constructing an enhanced electrochemical platform for a superb sensor. In this work, we present a facile synthesis of new fashioned heteronanostructure that is composed of one-dimensional Cu nanowires (NWs) and epitaxially grown two-dimensional Cu2O nanosheets (NSs). This hierarchical architecture is quite attractive in molecules detection for three unique characteristics: (1) the three-dimensional hierarchical architecture provides large specific surface areas for more active catalytic sites and easy accessibility for the target molecules; (2) the high-quality heterojunction with minimal lattice mismatch between the built-in current collector (Cu core) and active medium (Cu2O shell) considerably promotes the electron transport; (3) the adequate free space between branches and anisotropic NWs can accommodate a large volume change to avoid collapse or distortion during the reduplicative operation processes under applied potentials. The above three proposed advantages have been addressed in the fabricated Cu@Cu2O NS-NW-based superb glucose sensors, where a successful integration of ultrahigh sensitivity (1420 μA mM(-1) cm(-2)), low limit of detection (40 nM), and fast response (within 0.1 s) has been realized. Furthermore, the durability and reproducibility of such devices made by branched core-shell nanowires were investigated to prove viability of the proposed structures. This achievement in current work demonstrates an innovative strategy for nanoscale electrode design and application in molecular detection.
authors.affiliation: †State Key Laboratory of Safety and Control for Chemicals, SINOPEC Safety Engineering Institute, No 218, Yan'an 3 road, Shinan District, Shandong, Qingdao 266071, China.
authors.forename: Yuxin
authors.initials: Y
authors.lastname: Zhao
authors.forename: LiLi
authors.initials: L
authors.lastname: Fan
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: ∥Domestic Division, China Petroleum Pipeline Bureau, 87 Guangyang Road, Hebei, Langfang 065000, China.
authors.forename: Hu
authors.initials: H
authors.lastname: Zhao
authors.forename: Xuejin
authors.initials: X
authors.lastname: Li
authors.forename: Yanpeng
authors.initials: Y
authors.lastname: Li
authors.forename: Ling
authors.initials: L
authors.lastname: Wen
authors.forename: Zifeng
authors.initials: Z
authors.lastname: Yan
authors.affiliation: ⊥Queensland Micro- and Nanotechnology Centre Nathan Campus, Griffith University, 170 Kessels Road, Nathan Queensland 4111, Australia.
authors.forename: Ziyang
authors.initials: Z
authors.lastname: Huo
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation*; D003217:Conductometry / Q000295:instrumentation*; D003300:Copper / Q000737:chemistry; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005947:Glucose / Q000032:analysis* / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D008839:Microelectrodes; D053770:Nanowires / Q000737:chemistry* / Q000648:ultrastructure; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
chemical_list: D003300:Copper; D005947:Glucose; C030973:cupric oxide
keywords: core−shell; epitaxial growth; glucose sensor; hierarchical structures; nanowires