Synthesis of Pt-doped SnO2 flower-like hierarchical structure and its gas sensing properties to isopropanol

An assembled three-dimensional hierarchical nanostructure based on the two-dimensional nanostructure can not only maintain the characteristics of two-dimensional materials such as the larger specific surface area, but also improve their stability. The unique structure of such nanostructures promotes gas diffusion and adsorption, making gas sensitivity more excellent. Therefore, it is necessary to study a reliable method for preparing them with an important application value. In this work, a Pt-doped SnO2 flowerlike hierarchical structure was synthesized using a simple solvothermal method. A series of characterizations was carried out using different test methods, and the results showed that the prepared material was a flowerlike hierarchical structure assembled from porous nanosheets. In order to explore the gas sensitivity performance of the samples with different doping ratios to isopropanol, we prepared undoped samples and samples with different Pt doping ratios. The experimental results showed that, compared with the undoped samples, the samples with the doping ratio of 2.0 exhibited excellent gas sensitivity to isopropanol. Also, the response reached 171 at 250 degrees C, which is approximately 11 times higher than that of the undoped samples. In addition, the doped samples showed good linear response, excellent selectivity and good stability. We also systematically explored the gas-sensitive mechanism of the Pt-SnO2 to isopropanol.