W_(18)O_(49) nanorods decorated with Ag/AgCl nanoparticles as highly-sensitive gas-sensing material and visible-light-driven photocatalyst

摘要

A novel gas-sensing material and photocatalyst was successfully obtained by decorating Ag/AgCl nanoparticles on the W_(18)O_(49) nanorods through a clean photochemical route. The as-prepared samples were characterized using combined techniques of X-ray diffractometry, electron microscopy, energy dispersive X-ray spectrometry, and X-ray photoelectron spectroscopy. Gas-sensing measurements indicate that the Ag/AgCl/W_(18)O_(49) NRs sensors exhibit superior reducing gas-sensing properties to those of bare W _(18)O_(49) NRs, and they are highly selective and sensitive to NH_3, acetone, and H_2S with short response and recovery times. The Ag/AgCl/W_(18)O_(49) NRs photocatlysts also possess higher photocatalytic performance than bare W_(18)O_(49) NRs for degradation of methyl orange under simulated sunlight irradiation. Possible mechanisms concerning the enhancement of gas-sensing and photocatalytic activities of the Ag/AgCl/W_(18)O_(49) NRs composite were proposed.