Enhanced Acetone-Sensing Properties of Pt-Decorated In₂O₃ Hollow Microspheres Derived from Pt-Embedded Template

Pt-decorated In2O3 hollow microsphereswereprepared using a template and reflux method. The size of the preparedcarbon templates was adjusted from 200 nm to 1.3 & mu;m by introducingchloroplatinic acid during the hydrothermal process. At the same time,Pt nanoparticles inside the carbon layer were protected from oxidationand agglomeration. Also, the folds created on the surface of the hollowsphere during shrinkage led to a substantial increase in specificsurface area. The response of the In2O3-basedsensor toward acetone was significantly enhanced by the addition ofPt decoration. This improvement can be attributed to the increasedavailability of active sites for the target gas and the consequentialalteration of the energy band structure. In addition, high responsesensitivity, rapid dynamic processes, long-term reliability, and selectivityhave all been achieved. The detectable limit is less than 1 ppm, whichmight satisfy the 1.8 ppm threshold value in the exhaled breath ofpatients with diabetes. Consequently, the proposed sensor has greatsensitivity and can detect low-concentration of acetone, making itan ideal choice for applications such as monitoring daily dietaryintake, managing diabetes, and inspecting industrial production processes.