Bioinspired Bacterial Cellulose Carbon Nanofibers/AgO Composite for Sensitive and Selective Detection of H 2 O 2 Vapor at Room Temperature

Inspired by the structure of eggshell membranes, bacterial cellulose carbon nanofiber/AgO composite (BCCF-AgO) with a fibrous network was prepared by a one-step hydrothermal reaction. Material characterization showed that AgNO 3 was an important catalyst for reducing the carbonization temperature to 120°C and spheric AgO nanoparticles came into being on the surface of carbon nanofibers. Thanks to successful formation of heterojunctions between the BCCF and AgO, the BCCF-AgO showed excellent sensitivity, good selectivity, fast response–recovery, good long-term stability (30 days), and a low detection limit (53.2 ppb) to hydrogen peroxide vapor at room temperature, providing a green, simple, and cheap strategy for a hydrogen peroxide gas sensor.