NDLI: One-step photochemical deposition of PdAu alloyed nanoparticles on TiO<sub>2</sub> nanowires for ultra-sensitive H<sub>2</sub> detection

Content Provider	Royal Society of Chemistry (RSC)
Author	Liu, Wenjun Ren, Shoutian
Copyright Year	2016
Abstract	TiO2 nanostructures are widely used for H2 detection in scientific and technological research fields, but how to detect ppm-level H2 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. H2 sensing experiments indicate that sensitization with Pd or PdAu alloyed NPs makes TiO2 nanowire films highly sensitive to ppm-level H2 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.
Starting Page	2236
Ending Page	2245
Page Count	10
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	4
Issue Number	6
Journal	Journal of Materials Chemistry A
DOI	10.1039/c5ta06917c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Hydrothermal synthesis Photochemistry Nanowire
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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