Characteristics of binary WO@CuO and ternary WO@PDA@CuO based on impressive sensing acetone odor.

A series of biomimetic electronic nose nanomaterials of WO, WO@PDA, WO@PDA@CuO, WO@CuO and CuO were prepared by a facile method and their microstructures, surface chemical composition and sensing ability for acetone odor were investigated systematically by a variety of technologies. The WO@PDA@CuO and WO@CuO particles are in nano-sized shape, about 20 nm. The sensing ability to different concentrations acetone odor (50, 100 and 200 ppm) is addressed. The effect of different sensitivity definitions (R/R or |R - R|/R × 100%) on the comparison of experiment results is discussed. The WO@CuO sensing material shows the best sensing performance of all the sensors, being independent of concentration or sensitivity definitions. These results provide novel insights into the design and preparation of composite electronic nose sensing nanomaterials.