Efficient Size-Dependent Hot Electron Transfer from Au to TiO2 Nanoparticles

Ghorai, Nandan; Yang, Zhicheng; Gebre, Sara T.; Wu, Shengxiang; Zhao, Fengyi; Ivanov, Ilia N.; Lian, Tianquan

doi:10.1021/acs.nanolett.4c06154

Title: Efficient Size-Dependent Hot Electron Transfer from Au to TiO₂ Nanoparticles

Journal Article · 13 February 2025 · Nano Letters

DOI: https://doi.org/10.1021/acs.nanolett.4c06154 · OSTI ID:2524537

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Emory University, Atlanta, GA (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Harvesting of plasmon-induced hot carriers at the metal/semiconductor interface offers a promising and innovative avenue for solar energy conversion. However, their practical implementation is often hampered by their limited efficiencies. Herein, we have demonstrated a highly efficient plasmonic hot electron transfer with a quantum efficiency (QE) of up to 57 ± 4% from 5.25 nm Au nanoparticles (NPs) to TiO₂ films under 400 nm ultrafast laser excitation. The observed hot electron transfer QEs decrease at larger particle sizes, to 20% for 9.1 nm Au, and show negligible changes with excitation wavelengths at 400, 500, and 600 nm. Analysis of the size and excitation wavelength dependent hot electron transfer QEs suggests they contain contributions of interband absorption, indirect plasmon-induced hot electron transfer (PHET), and direct plasmon-induced interfacial charge transfer transition (PICTT) pathways, and QEs of all three pathways increase at smaller Au size. Our result suggests that reducing plasmon particle sizes is a promising approach for efficient plasmonic hot-carrier extraction.

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Research Organization:: Emory University, Atlanta, GA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0008798

OSTI ID:: 2524537

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 8 Vol. 25; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Au nanoparticles
TiO2
hot electron transfer
plasmon damping
surface plasmon resonance

Title: Efficient Size-Dependent Hot Electron Transfer from Au to TiO2 Nanoparticles

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References (41)

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Related Subjects

Title: Efficient Size-Dependent Hot Electron Transfer from Au to TiO₂ Nanoparticles