19 September 2018 Directed assembly of bimetallic nanoarchitectures by interfacial photocatalysis with plasmonic hot electrons
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Targeted, sequential deposition of metals using localized surface plasmon resonance (LSPR) is a promising fabrication route for solar fuel catalysts and sensors. This work examines liquid-phase, reductive photodeposition of platinum (Pt) nanoparticles onto the longitudinal ends of gold nanorods (AuNR) under surface plasmon excitation. Reductive Pt nucleation is initiated by plasmonic hot electrons at the Au-liquid interface, whose sites are governed by the plasmon polarity. In this work, in situ spectroscopic monitoring of the photodeposition process permitted real-time feedback into AuNR surface functionalization with the Pt precursor, Pt growth kinetics under monochromatic AuNR LSPR excitation, and their evolving light-matter interactions. Energy dispersive spectroscopy (EDS) mappings show Pt deposition was localized toward the AuNR ends. Coordinated X-ray photoelectron spectroscopy (XPS) measurements with density functional theory (DFT) calculations of the Pt-decorated AuNR density of states (DOS) elucidated optoelectronic behavior. Catalytic photodeposition using plasmonic hot electrons provide an economical path towards targeted, hierarchal assembly of multi-metallic nanoarchitectures at ambient conditions with specified optoelectronic activity.
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Gregory T. Forcherio, David R. Baker, Jonathan Boltersdorf, Joshua P. McClure, Asher C. Leff, and Cynthia A Lundgren "Directed assembly of bimetallic nanoarchitectures by interfacial photocatalysis with plasmonic hot electrons", Proc. SPIE 10720, Nanophotonic Materials XV, 107200K (19 September 2018); doi: 10.1117/12.2321032; https://doi.org/10.1117/12.2321032

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