Thickness controllable single-crystal WO3 nanosheets: Highly selective sensor for triethylamine detection at room temperature

Single-crystal WO3 nanosheets were prepared by a one-step precipitation method. The nanosheet thickness was controlled by adjusting the NaOct/NaOA mass ratio and the volume of solvent EtOH. WO3-5 nm sensor exhibits fast response and enhanced selectivity for triethylamine (TEA) detection at 25 °C, demonstrating a TEA response value about 6.4 times of that for WO3-10 nm sensor.