The preparation and the catalytic properties of ZnO composite nanotubes based on nature silk fiber as template

• 1、College of sciences, Nanjing Tech University,Nanjing 211816

Abstract：Herein, a convenient and biocompatible method was applied for preparing the zinc oxide nanotubes (ZnO-NTs) using natural silk fibers as template. The silk fibers were firstly immersed into the zinc nitrate solution for 12 h, and then dried and sintered. During the sintering procedure, zinc nitrate attached onto the silk surface could be decomposed to ZnO and the silk template could be removed. After the electrostatic modification of gold nanoparticles (AuNPs), the AuNPs/ZnO-NTs were immobilized onto the surface of glassy carbon electrode and based on which a non-enzymatic hydrogen peroxide (H2O2) sensor had been fabricated. The AuNPs/ZnO-NTs exhibited highly catalytic sensitivity to H2O2, with the reduction potential of 0.05 V, which would decrease the interferences from other coexistent small molecules. The proposed biosensor exhibited a good linear response in the range from 0.001 to 3.0 mM with a detection limit of 0.1 μM (S/N=3) under the optimum conditions. The detection of H2O2 concentration in real sample showed acceptable accuracy with the traditional potassium permanganate titration.

Keywords： Zinc oxide nanotube gold nanoparticles natural silk fiber hydrogen peroxide non-enzymatic catalysis