Publications by authors named "Scott M Rogers"

The interaction between Pd and TiO2 for promoting photocatalytic activity was investigated by tailoring the size of Pd nanoparticles and monitoring the photocatalytic activity of methanol photo-reforming reaction for hydrogen gas production. We show that at 0.6 wt% Pd loading, the catalyst with highly dispersed nanoparticles obtained at 1 °C temperature exhibits superior photocatalytic activity for hydrogen gas production.

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Article Synopsis
  • Sol-immobilization is a method used to create supported metal nanoparticles (NPs) with controlled size and shape, leading to a narrow size distribution.
  • Advanced X-ray absorption fine structure (XAFS) techniques provide precise structural information on gold (Au) nanoparticles in dilute solutions (μM concentrations).
  • The study finds that temperature adjustment can tune the size of Au colloids, Au concentration has minimal impact on average particle size in solution, and the immobilization process significantly increases particle size, particularly at higher concentrations, enhancing material optimization for catalytic uses.
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The use of sol-immobilisation to prepare supported metal nanoparticles is an area of growing importance in heterogeneous catalysis; it affords greater control of nanoparticle properties compared to conventional catalytic routes e.g. impregnation.

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In the present work, a combination of imaging, spectroscopic and computational methods shows that 1-dodecanethiol undergoes S-deprotonation to form 1-dodecanethiolate on the surface of palladium nanoparticles, which then self-assembles into a structure that shows a high degree of order. The alkyl chain is largely in the all-trans conformation, which occurs despite the small size of the nanoparticle, (mean diameter = 3.9 nm).

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