Charge carrier dynamics of photoexcited Co3O4 in methanol: Extending high harmonic transient absorption spectroscopy to liquid environments

L. Robert Baker; Chang Ming Jiang; Stephen T. Kelly; J. Matthew Lucas; Josh Vura-Weis; Mary K. Gilles; A. Paul Alivisatos; Stephen R. Leone

doi:10.1021/nl502817a

Charge carrier dynamics of photoexcited Co₃O₄ in methanol: Extending high harmonic transient absorption spectroscopy to liquid environments

L. Robert Baker, Chang Ming Jiang, Stephen T. Kelly, J. Matthew Lucas, Josh Vura-Weis, Mary K. Gilles, A. Paul Alivisatos, Stephen R. Leone

Research output: Contribution to journal › Article › peer-review

Abstract

Charge carrier dynamics in Co₃O₄ thin films are observed using high harmonic generation transient absorption spectroscopy at the Co M_2,3 edge. Results reveal that photoexcited Co₃O₄ decays to the ground state in 600 ± 40 ps in liquid methanol compared to 1.9 ± 0.3 ns in vacuum. Kinetic analysis suggests that surface-mediated relaxation of photoexcited Co₃O₄ may be the result of hole transfer from Co₃O₄ followed by carrier recombination at the Co₃O₄-methanol interface.

Original language	English (US)
Pages (from-to)	5883-5890
Number of pages	8
Journal	Nano letters
Volume	14
Issue number	10
DOIs	https://doi.org/10.1021/nl502817a
State	Published - Oct 8 2014
Externally published	Yes

Keywords

High harmonic generation
interfacial charge transfer
ligand-to-metal charge transfer
photocatalysis
surface states
transient absorption spectroscopy

ASJC Scopus subject areas

Bioengineering
General Chemistry
General Materials Science
Condensed Matter Physics
Mechanical Engineering

Online availability

10.1021/nl502817a

Library availability

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Cite this

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title = "Charge carrier dynamics of photoexcited Co3O4 in methanol: Extending high harmonic transient absorption spectroscopy to liquid environments",

abstract = "Charge carrier dynamics in Co3O4 thin films are observed using high harmonic generation transient absorption spectroscopy at the Co M2,3 edge. Results reveal that photoexcited Co3O4 decays to the ground state in 600 ± 40 ps in liquid methanol compared to 1.9 ± 0.3 ns in vacuum. Kinetic analysis suggests that surface-mediated relaxation of photoexcited Co3O4 may be the result of hole transfer from Co3O4 followed by carrier recombination at the Co3O4-methanol interface.",

keywords = "High harmonic generation, interfacial charge transfer, ligand-to-metal charge transfer, photocatalysis, surface states, transient absorption spectroscopy",

author = "Baker, {L. Robert} and Jiang, {Chang Ming} and Kelly, {Stephen T.} and Lucas, {J. Matthew} and Josh Vura-Weis and Gilles, {Mary K.} and Alivisatos, {A. Paul} and Leone, {Stephen R.}",

note = "Publisher Copyright: {\textcopyright} 2014 American Chemical Society.",

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doi = "10.1021/nl502817a",

language = "English (US)",

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T2 - Extending high harmonic transient absorption spectroscopy to liquid environments

AU - Baker, L. Robert

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AU - Lucas, J. Matthew

AU - Vura-Weis, Josh

AU - Gilles, Mary K.

AU - Alivisatos, A. Paul

AU - Leone, Stephen R.

PY - 2014/10/8

Y1 - 2014/10/8

N2 - Charge carrier dynamics in Co3O4 thin films are observed using high harmonic generation transient absorption spectroscopy at the Co M2,3 edge. Results reveal that photoexcited Co3O4 decays to the ground state in 600 ± 40 ps in liquid methanol compared to 1.9 ± 0.3 ns in vacuum. Kinetic analysis suggests that surface-mediated relaxation of photoexcited Co3O4 may be the result of hole transfer from Co3O4 followed by carrier recombination at the Co3O4-methanol interface.

AB - Charge carrier dynamics in Co3O4 thin films are observed using high harmonic generation transient absorption spectroscopy at the Co M2,3 edge. Results reveal that photoexcited Co3O4 decays to the ground state in 600 ± 40 ps in liquid methanol compared to 1.9 ± 0.3 ns in vacuum. Kinetic analysis suggests that surface-mediated relaxation of photoexcited Co3O4 may be the result of hole transfer from Co3O4 followed by carrier recombination at the Co3O4-methanol interface.

KW - High harmonic generation

KW - interfacial charge transfer

KW - ligand-to-metal charge transfer

KW - photocatalysis

KW - surface states

KW - transient absorption spectroscopy

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