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Ultrathin CdSe in Plasmonic Nanogaps for Enhanced Photocatalytic Water Splitting.

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Sigle, Daniel O 
Zhang, Liwu 
Ithurria, Sandrine 
Dubertret, Benoit 
Baumberg, Jeremy J 


Enhanced plasmonic fields are a promising way to increase the efficiency of photocatalytic water splitting. The availability of atomically thin materials opens up completely new opportunities. We report photocatalytic water splitting on ultrathin CdSe nanoplatelets placed in plasmonic nanogaps formed by a flat gold surface and a gold nanoparticle. The extreme field intensity created in these gaps increases the electron–hole pair production in the CdSe nanoplatelets and enhances the plasmon-mediated interfacial electron transfer. Compared to individual nanoparticles commonly used to enhance photocatalytic processes, gap-plasmons produce several orders of magnitude higher field enhancement, strongly localized inside the semiconductor sheet thus utilizing the entire photocatalyst efficiently.



Water splitting, plasmonics, nanogaps, photocatalysis, nanoplatelets, CdSe

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J Phys Chem Lett

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American Chemical Society (ACS)
Engineering and Physical Sciences Research Council (EP/G060649/1)
Engineering and Physical Sciences Research Council (EP/K028510/1)
Engineering and Physical Sciences Research Council (EP/L027151/1)
European Research Council (320503)
This work was supported by the U.K. EPSRC grant EP/G060649/1 and EPSRC grant EP/L027151/1, Defence Science and Technology Laboratory (DSTL), a Marie Curie Intra-European Fellowship (FP7-PEOPLE-2011-IEF 298012 to L.Z.) and ERC grant 320503 LINASS.