Ultrahigh-acetone-sensitivity sensor based on Pt-loaded TiO₂porous nanoparticles synthesized via a facile...

A simple hydrothermal method based on an orthogonal experimental design was used to synthesis Pt-loaded TiO₂mesoporous nanoparticles in one step. The successful synthesis of Pt-loaded TiO₂nanoparticles was demonstrated by various characterization methods. The effects of the modification of Pt and its explanation are described in detail by means of the test results. Through systematic gas-sensing tests, we found that the Pt-loaded TiO₂nanoparticles outperform pure TiO₂nanoparticles, with a high response value (S= 42.5) to 200 ppm acetone at 260 °C and with a film thickness of 0.45 mm, far superior to that of pure TiO₂. The response time (8 s) and recovery time (11 s) of the material are also relatively good with excellent selectivity and long-term stability (30 days). The frequent use of acetone as an organic solution in factories and laboratories, as well as the possibility of making a preliminary diagnosis of diabetes by detecting acetone levels in exhaled gas, make this work promising for environmental monitoring and medical diagnosis.