Luminescence studies of individual quantum dot photocatalysts

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[1] Amirav, Lilac
[2] Alivisatos, A. Paul
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Alivisatos, A.P. (alivis@berkeley.edu) | 1600年 / American Chemical Society卷 / 135期
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Using far-field optical microscopy we report the first measurements of photoluminescence from single nanoparticle photocatalysts. Fluence-dependent luminescence is investigated from metal-semiconductor heterojunction quantum dot catalysts exposed to a variety of environments; ranging from gaseous argon to liquid water containing a selection of hole scavengers. The catalysts each exhibit characteristic nonlinear fluence dependence. From these structurally and environmentally sensitive trends; we disentangle the separate rate-determining steps in each particle across the very wide range of time scales; which follow the initial light absorption process. This information will significantly benefit the design of effective artificial photocatalytic systems for renewable direct solar-to-fuel energy conversion. © 2013 American Chemical Society;
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