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