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Structure-Property-Performance Relationships of Cuprous Oxide Nanostructures for Dielectric Mie Resonance-Enhanced Photocatalysis

Tirumala, Ravi Teja A and Gyawali, Sunil and Wheeler, Aaron and Ramakrishnan, Sundaram Bhardwaj and Sooriyagoda, Rishmali and Mohammadparast, Farshid and Tan, Susheng and Kalkan, A Kaan and Bristow, Alan D and Andiappan, Marimuthu Structure-Property-Performance Relationships of Cuprous Oxide Nanostructures for Dielectric Mie Resonance-Enhanced Photocatalysis.

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Abstract

Nanostructured metal oxides, such as Cu2O, CeO2, {\alpha}-Fe2O3, and TiO2 can efficiently mediate photocatalysis for solar-to-chemical energy conversion and pollution remediation. In this contribution, we report a novel approach, dielectric Mie resonance-enhanced photocatalysis, to enhance the catalytic activity of metal oxide photocatalysts. Specifically, we demonstrate that Cu2O nanostructures exhibiting dielectric Mie resonances can exhibit up to an order of magnitude higher photocatalytic rate as compared to Cu2O nanostructures not exhibiting dielectric Mie resonances. Our finite-difference time-domain (FDTD) simulation and experimental results predict a volcano-type relationship between the photocatalytic rate and the size of Cu2O nanospheres and nanocubes. Using transient absorption measurements, we reveal that a coherent electronic process associated with dielectric Mie resonance-mediated charge carrier generation is dominant in Cu2O nanostructures that exhibit higher photocatalytic rates. Although we experimentally demonstrate dielectric Mie resonance-enhanced photocatalysis using Cu2O particles here, based on our FDTD simulations, we anticipate the same can be achieved with other metal oxide photocatalysts, including CeO2, {\alpha}-Fe2O3, and TiO2.

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Item Type: Article
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Tirumala, Ravi Teja A
Gyawali, Sunil
Wheeler, Aaron
Ramakrishnan, Sundaram Bhardwaj
Sooriyagoda, Rishmali
Mohammadparast, Farshid
Tan, Sushengsut6@pitt.eduSUT60000-0002-6162-7443
Kalkan, A Kaan
Bristow, Alan D
Andiappan, Marimuthu
Refereed: No
Uncontrolled Keywords: physics.app-ph, physics.app-ph, cond-mat.mtrl-sci, physics.optics
Additional Information: Combined draft. Both Main draft & SI. Total of 62 pages. arXiv admin note: text overlap with arXiv:2109.13285
Date Deposited: 13 Dec 2021 15:21
Last Modified: 23 Jan 2022 03:55
URI: http://d-scholarship.pitt.edu/id/eprint/42064

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