Strong Transient Absorption of Trapped Holes in Anatase and Rutile TiO2 at High Laser Intensities

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Autoren

  • Jenny Schneider
  • Detlef Bahnemann

Organisationseinheiten

Externe Organisationen

  • Staatliche Universität Sankt Petersburg
Forschungs-netzwerk anzeigen

Details

OriginalspracheEnglisch
Seiten (von - bis)13979-13985
Seitenumfang7
FachzeitschriftThe Journal of Physical Chemistry C
Jahrgang122
Ausgabenummer25
Frühes Online-Datum17 Apr. 2018
PublikationsstatusVeröffentlicht - 28 Juni 2018

Abstract

During transient absorption spectroscopic investigations we found that the intensity of the transient absorption signal of the trapped holes monitored in the microsecond time domain drastically increases at high excitation laser intensity. This increase has been related to the presence of long-lived Ti 3+ centers formed upon high laser exposure via a surface reorganization. The Coulomb interaction of the trapped holes with long-lived Ti 3+ centers leads to an increased absorption coefficient of the former resulting in much higher transient absorption signals below 450 nm rather than in the wavelength region above where the trapped electrons absorb. The surface reorganization induced via the excitation source can be avoided in the case of anatase if the measurements are conducted at low laser intensities, while in the case of rutile already at low excitation conditions the transient absorption enhancement of the trapped holes occurs.

ASJC Scopus Sachgebiete

Zitieren

Strong Transient Absorption of Trapped Holes in Anatase and Rutile TiO2 at High Laser Intensities. / Schneider, Jenny; Bahnemann, Detlef.
in: The Journal of Physical Chemistry C, Jahrgang 122, Nr. 25, 28.06.2018, S. 13979-13985.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Schneider, J & Bahnemann, D 2018, 'Strong Transient Absorption of Trapped Holes in Anatase and Rutile TiO2 at High Laser Intensities', The Journal of Physical Chemistry C, Jg. 122, Nr. 25, S. 13979-13985. https://doi.org/10.1021/acs.jpcc.8b01109
Schneider, J., & Bahnemann, D. (2018). Strong Transient Absorption of Trapped Holes in Anatase and Rutile TiO2 at High Laser Intensities. The Journal of Physical Chemistry C, 122(25), 13979-13985. https://doi.org/10.1021/acs.jpcc.8b01109
Schneider J, Bahnemann D. Strong Transient Absorption of Trapped Holes in Anatase and Rutile TiO2 at High Laser Intensities. The Journal of Physical Chemistry C. 2018 Jun 28;122(25):13979-13985. Epub 2018 Apr 17. doi: 10.1021/acs.jpcc.8b01109
Schneider, Jenny ; Bahnemann, Detlef. / Strong Transient Absorption of Trapped Holes in Anatase and Rutile TiO2 at High Laser Intensities. in: The Journal of Physical Chemistry C. 2018 ; Jahrgang 122, Nr. 25. S. 13979-13985.
Download
@article{008a1c32e9ff449b885a1c9c2ad6b4e2,
title = "Strong Transient Absorption of Trapped Holes in Anatase and Rutile TiO2 at High Laser Intensities",
abstract = "During transient absorption spectroscopic investigations we found that the intensity of the transient absorption signal of the trapped holes monitored in the microsecond time domain drastically increases at high excitation laser intensity. This increase has been related to the presence of long-lived Ti 3+ centers formed upon high laser exposure via a surface reorganization. The Coulomb interaction of the trapped holes with long-lived Ti 3+ centers leads to an increased absorption coefficient of the former resulting in much higher transient absorption signals below 450 nm rather than in the wavelength region above where the trapped electrons absorb. The surface reorganization induced via the excitation source can be avoided in the case of anatase if the measurements are conducted at low laser intensities, while in the case of rutile already at low excitation conditions the transient absorption enhancement of the trapped holes occurs. ",
author = "Jenny Schneider and Detlef Bahnemann",
note = "Copyright {\textcopyright} 2018 American Chemical Society",
year = "2018",
month = jun,
day = "28",
doi = "10.1021/acs.jpcc.8b01109",
language = "English",
volume = "122",
pages = "13979--13985",
number = "25",

}

Download

TY - JOUR

T1 - Strong Transient Absorption of Trapped Holes in Anatase and Rutile TiO2 at High Laser Intensities

AU - Schneider, Jenny

AU - Bahnemann, Detlef

N1 - Copyright © 2018 American Chemical Society

PY - 2018/6/28

Y1 - 2018/6/28

N2 - During transient absorption spectroscopic investigations we found that the intensity of the transient absorption signal of the trapped holes monitored in the microsecond time domain drastically increases at high excitation laser intensity. This increase has been related to the presence of long-lived Ti 3+ centers formed upon high laser exposure via a surface reorganization. The Coulomb interaction of the trapped holes with long-lived Ti 3+ centers leads to an increased absorption coefficient of the former resulting in much higher transient absorption signals below 450 nm rather than in the wavelength region above where the trapped electrons absorb. The surface reorganization induced via the excitation source can be avoided in the case of anatase if the measurements are conducted at low laser intensities, while in the case of rutile already at low excitation conditions the transient absorption enhancement of the trapped holes occurs.

AB - During transient absorption spectroscopic investigations we found that the intensity of the transient absorption signal of the trapped holes monitored in the microsecond time domain drastically increases at high excitation laser intensity. This increase has been related to the presence of long-lived Ti 3+ centers formed upon high laser exposure via a surface reorganization. The Coulomb interaction of the trapped holes with long-lived Ti 3+ centers leads to an increased absorption coefficient of the former resulting in much higher transient absorption signals below 450 nm rather than in the wavelength region above where the trapped electrons absorb. The surface reorganization induced via the excitation source can be avoided in the case of anatase if the measurements are conducted at low laser intensities, while in the case of rutile already at low excitation conditions the transient absorption enhancement of the trapped holes occurs.

UR - http://www.scopus.com/inward/record.url?scp=85046450525&partnerID=8YFLogxK

U2 - 10.1021/acs.jpcc.8b01109

DO - 10.1021/acs.jpcc.8b01109

M3 - Article

VL - 122

SP - 13979

EP - 13985

JO - The Journal of Physical Chemistry C

JF - The Journal of Physical Chemistry C

IS - 25

ER -