In this work, the simple solvothermal method is adopted to synthesize nanometer sized hollow ternary composites of Pd@ZnO-SnO₂ by using the protective effect of PVP molecules and ZIF-8 templates. The corresponding characterization such as SEM, XRD, XPS, TEM and HRTEM are employed to confirm the nanostructures, compositions and element distributions. Unlike other composites based on SnO₂, the sensing materials in this work have small sizes (∼100 nm). More importantly, compared to pure SnO₂ sensor, the sensor based on ternary nanocomposites of Pd@ZnO-SnO₂ provides higher response, faster response speed and better selectivity. The extraordinary sensing performance is not only dependent on the complex heterojunctions in the ternary composite oxide semiconductor nanomaterials, but is also affected by the modulate of the oxygen vacancy and chemisorbed oxygen. In addition, the catalytic effect of the noble metal Pd also leads to the pronounced sensing properties. This promising sensing nanomaterials have offered unprecedented opportunities for the prevention of HCHO hazards.

本工作采用简单的溶剂热法，利用PVP分子和ZIF-8模板的保护作用，合成了Pd@ZnO-SnO ₂纳米空心三元复合材料。采用 SEM、XRD、XPS、TEM 和 HRTEM 等相应表征来确认纳米结构、成分和元素分布。与其他基于 SnO ₂的复合材料不同，这项工作中的传感材料尺寸较小（~100 nm）。更重要的是，与纯SnO _{2传感器相比，基于Pd@ZnO-SnO 2}三元纳米复合材料的传感器提供更高的响应、更快的响应速度和更好的选择性。优异的传感性能不仅取决于三元复合氧化物半导体纳米材料中复杂的异质结，还受到氧空位和化学吸附氧调制的影响。此外，贵金属钯的催化作用也导致了显着的传感特性。这种有前途的传感纳米材料为预防 HCHO 危害提供了前所未有的机会。