期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 30, 页码 16802-16812出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b04614
关键词
nanowires; glucose sensor; hierarchical structures; core-shell; epitaxial growth
资金
- Key Joint Foundation of PetroChina
- Natural Science Foundation of China [NSFC U1362202, 51271215, 21106185]
- PetroChina key programs on oil refinery catalysts [2010E-1908, 2010E-1903]
- Fundamental Research Funds for Central Universities [15CX02069A]
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 mu A 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.
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