Highly sensitive acetone gas sensor based on gold nanoparticles modified W18O49 porous polymeric spheres

Abstract

Abstract A two-step solvothermal approach was used to create porous polymeric spheres of W18O49 modified with gold nanoparticles. Various characterizations of the material were carried out by XRD, SEM, etc., and the results show that the material is highly crystalline and the surface has a porous nature, in addition, the addition of gold substantially improves the adsorbed oxygen content. The results of the gas sensitivity test showed that the gold nanoparticle-modified W18O49 porous polymeric spheres showed a significant improvement in performance compared to pure W18O49. The gold nanoparticle-modified W18O49 porous polymeric spheres demonstrated an increased reaction value to 100 ppm acetone at a lower temperature of 220 °C (S=66, 2.57 times that of the pure material), a quick response/recovery time (5s/12s), as well as strong selectivity and stability. W18O49 porous polymeric spheres enhanced with gold nanoparticles have good potential for acetone gas detection and are likely to be used in high-performance sensors.