Abstract
? 2022 Elsevier B.V.Au nanoparticle-modified porous TiO2 (Au@TiO2) nanospheres were prepared using a simple hydrothermal route followed by liquid reduction. Au NPs with a diameter of ~12 nm were well anchored on the surfaces of porous TiO2 nanospheres by epitaxial growth as their crystal planes had similar spacings. The sensing behavior of Au@TiO2 nanospheres was investigated using various organic vapors. Au@TiO2 nanospheres show higher responses towards 100 ppm formaldehyde, acetone, ethanol, and isopropanol with respective response values of 45.2, 55, 29, and 50 at a working temperature of 220 °C. The response/recovery times of the Au@TiO2 sensor for 100 ppm acetone vapor were 12 s and 13 s, respectively. These excellent sensing results indicate Au nanoparticle-modified porous TiO2 nanospheres are promising sensing material for the accurate detection of toxic volatile vapors.
NSTL
Elsevier