Flexible Free-Standing CuO/AgO ( = 1, 2) Nanowires Integrated with Nanoporous Cu-Ag Network Composite for Glucose Sensing.

To improve glucose electrocatalytic performance, one efficient manner is to develop a novel Cu-Ag bimetallic composite with fertile porosity and unique architecture. Herein, the self-supported electrode with CuO/AgO ( = 1, 2) nanowires grown in-situ on a nanoporous Cu-Ag network (u/AgO@NP-CuAg) has been successfully designed by a facile two-step approach. The integrated hierarchical porous structure, the tip-converged CuO/AgO nanowires combined with the interconnected porous conductive substrate, are favorable to provide more reactive sites and improve ions or electrons transportation. Compared with monometallic CuO nanowires integrated with nanoporous Cu matrix (CuO@NP-Cu), the bimetallic CuO/AgO@NP-CuAg composites exhibit the enhanced electrocatalytic performance for glucose. Moreover, the higher sensitivity of ~1.49 mA mM cm in conjunction with a wider linear range of 17 mM for the CuO/AgO@NP-CuAg electrode anodized for 10 min are attributed to the synergistic effect of porous structure and bimetallic CuO/AgO nanowires. Particularly, the integrated CuO/AgO@NP-CuAg composites possess good flexibility, which has been reported for the first time. Accordingly, the CuO/AgO@NP-CuAg with excellent glucose electrocatalytic performance and good flexibility is promising to further develop as a candidate electrode material of glucose sensors.