V_2O_5 nanofiber-based chemiresistors for ammonia detection

摘要

Vanadium pentoxide (V_2O_5) nanofibers with a cross-section of 15 nm~2 were obtained by self-assembly in aqueous solution. These fibers - the length of which can reach 10-15 μm - have been deposited as a thin network on interdigitated electrode structures with 10 μm electrode gap. Exposure to ammonia at room-temperature changes the conductance of the networks, which makes them useful as chemiresistors for gas-sensing applications. By evaluating the concentration dependence of the sensor response, we found that the gas adsorption follows the Langmuir adsorption isotherm.