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Au/Cu2O core/shell nanostructures with efficient photoresponses

Naz, Gul and Shamsuddin, Mustaffa and Butt, Faheem K. and Bajwa, Sadia Z. and Khan, Waheed S. and Irfan, Muhammad and Irfan, Masooma (2019) Au/Cu2O core/shell nanostructures with efficient photoresponses. Chinese Journal of Physics, 59 . pp. 307-316. ISSN 0577-9073

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Official URL: http://dx.doi.org/10.1016/j.cjph.2019.03.008


Metal/semiconductor nanoscale heterojunctions are of pronounced attention because of their specific structures and properties that vary in their individual counterparts and anticipated applications in photo-driven fields. A modified facile method is reported in this connection for the formation of cuprous-oxide coated gold (Au/Cu 2 O) nanostructures including octahedral, cuboctahedral and flower-like structures using cubic and multi-faceted gold nanostructures as the core material. The well-organized shape growth of the Cu 2 O-shell is accomplished via an adequate adjustment of the ratio H 2 O:NH 2 OH · HCl in the solution. The effect of nanoparticle's shape and thickness of the shell on the optical properties of truncated-octahedra, cuboctahedra and flower-like Au/Cu 2 O nanostructures (having sizes within 90–230 nm) shows a bathochromatic shift in the surface plasmon resonance (SPR) band of the Au-core with the increase of shell thickness. A comparative study to correlate the photoluminescence analyses of core/shell nanostructures with their photocatalytic activities shows that truncated-octahedra and nanoflowers, bounded by {111} facets, are photocatalytically more active. On the other hand, cuboctahedra with more {100} catalytically inactive sites reveal a comparatively sharp emission peak. These photoresposes are also appeared to be affected by SPR coupling between plasmonic metal-core and semiconducting-shell.

Item Type:Article
Uncontrolled Keywords:optical properties, photocatalysis, photoluminescence
Subjects:Q Science > QD Chemistry
ID Code:88696
Deposited By: Yanti Mohd Shah
Deposited On:15 Dec 2020 18:39
Last Modified:15 Dec 2020 18:39

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