Charge Carrier Dynamics of Photoexcited Co3O4 in Methanol: Extending High Harmonic Transient Absorption Spectroscopy to Liquid Environments

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• 作者：L. Robert Baker ; Chang-Ming Jiang ; Stephen T. Kelly ; J. Matthew Lucas ; Josh Vura-Weis ; Mary K. Gilles ; A. Paul Alivisatos ; Stephen R. Leone
• 刊名：Nano Letters
• 出版年：2014
• 出版时间：October 8, 2014
• 年：2014
• 卷：14
• 期：10
• 页码：5883-5890
• 全文大小：341K
• ISSN：1530-6992

文摘

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 卤 40 ps in liquid methanol compared to 1.9 卤 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鈥搈ethanol interface.

Keywords:

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