三维有序介孔SnO2负载PtAu双金属的制备及丙酮气敏性能研究

Synthesis and Acetone Sensing Performance of Three-dimensional Ordered Mesoporous SnO2 Loaded with Bimetallic PtAu

摘要:

丙酮是糖尿病早期筛查与无创诊断的关键生物标志物。本研究旨在开发适用于呼气丙酮检测的高性能气敏材料，采用模板法与原位还原法制备了PtAu双金属纳米粒子修饰的三维有序介孔SnO2复合材料。材料表征显示其具有高度有序介孔结构、金红石晶体相以及均匀分散的PtAu纳米粒子。在300 ℃工作温度下，该材料对100 ppm丙酮响应值高达192.3，检测限低至77 ppb，响应与恢复时间为30 s/9 s，且在宽湿度范围内表现出良好的稳定性与抗干扰能力。性能提升主要归因于三维有序介孔结构提供的高比表面积与快速气体扩散通道，以及PtAu纳米粒子的协同催化与电子敏化作用，二者共同促进了丙酮的吸附活化和表面反应动力学，在糖尿病呼气检测中表现出重要应用潜力。

Abstract:

Acetone is a key biomarker for early screening and non-invasive diagnosis of diabetes. This study aimed to develop high-performance gas-sensitive materials suitable for breath acetone detection. PtAu bimetallic-modified three-dimensional ordered mesoporous SnO2 composite material (PtAu/3DOM SnO2) was prepared using a template method combined with an in-situ reduction process. The results of material characterization revealed a highly ordered mesoporous structure, a rutile crystal phase, and uniformly dispersed PtAu nanoparticles. At an operating temperature of 300 ℃, the material exhibited a high response value of 192.3 to 100 ppm acetone, a low detection limit of 77 ppb, response and recovery times of 30 s and 9 s, respectively, and demonstrated good stability and anti-interference capability over a wide humidity range. The performance enhancement is primarily attributed to the high specific surface area and rapid gas diffusion channels provided by the three-dimensional ordered mesoporous structure, as well as the synergistic catalytic and electronic sensitization effects of the PtAu nanoparticles. Together, these factors promote the adsorption, activation, and surface reaction kinetics of acetone, showing significant application potential in diabetes breath detection. .