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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >One-step photochemical deposition of PdAu alloyed nanoparticles on TiO2 nanowires for ultra-sensitive H-2 detection
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One-step photochemical deposition of PdAu alloyed nanoparticles on TiO2 nanowires for ultra-sensitive H-2 detection

机译：PdAu合金纳米颗粒在TiO2纳米线上的一步光化学沉积，用于超灵敏的H-2检测

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摘要

TiO2 nanostructures are widely used for H-2 detection in scientific and technological research fields, but how to detect ppm-level H-2 in a timely and sensitive manner at room temperature remains challenging. In this work, TiO2 nanowires were synthesized on a Ti foil substrate via the hydrothermal method, and then decorated with PdAu alloyed nanoparticles (NPs) via a one-step photochemical deposition method. What's more, the Pd/Au atomic ratio in alloyed NPs could be adjusted by just changing the Pd2+/Au3+ ratio in the precursor solution. H-2 sensing experiments indicate that sensitization with Pd or PdAu alloyed NPs makes TiO2 nanowire films highly sensitive to ppm-level H-2 at room temperature. The role of Au in alloyed NPs is estimated by comparing the sensing performance of PdAu@TiO2 with different Pd/Au ratios in alloyed NPs and references (e.g., TiO2, Au@TiO2 and Pd@TiO2). The results indicate that the as-synthesized PdAu@TiO2 with less than 25% Au in alloyed NPs exhibits higher sensitivity and a faster response than Pd@TiO2, and plausible enhancement mechanisms of the Au component in alloyed NPs on the performance of PdAu@TiO2 are also supplied.
机译：TiO2纳米结构在科学和技术研究领域中广泛用于H-2检测，但是如何在室温下及时，灵敏地检测ppm级H-2仍然具有挑战性。在这项工作中，TiO 2纳米线通过水热法合成在Ti箔基板上，然后通过一步光化学沉积法用PdAu合金纳米颗粒（NPs）装饰。而且，只需改变前体溶液中的Pd2 + / Au3 +比，即可调整合金化NP中Pd / Au原子比。 H-2感测实验表明，对Pd或PdAu合金化NP的敏化使TiO2纳米线薄膜在室温下对ppm级H-2高度敏感。通过比较合金化NP中不同Pd / Au比的PdAu @ TiO2的传感性能和参比样品（例如TiO2，Au @ TiO2和Pd @ TiO2），可以估算Au在合金化NP中的作用。结果表明，合金化NP中Au含量低于25％的合成PdAu @ TiO2比Pd @ TiO2具有更高的灵敏度和更快的响应，而且合金化NP中Au成分对PdAu @ TiO2性能的合理增强机制。还提供。

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