TY - JOUR
T1 - Revelation of rutile phase by Raman scattering for enhanced photoelectrochemical performance of hydrothermally-grown anatase TiO 2 film
AU - Cho, Hsun Wei
AU - Liao, Kuo Lun
AU - Yang, Jih Sheng
AU - Wu, Jih Jen
N1 - Funding Information:
This research is supported by the Ministry of Science and Technology in Taiwan under Contracts MOST 105−2221-E-006−251-MY3 and MOST 106−2221-E-006−202-MY3 .
Funding Information:
This research is supported by the Ministry of Science and Technology in Taiwan under Contracts MOST 105−2221-E-006−251-MY3 and MOST 106−2221-E-006−202-MY3.
Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/5/15
Y1 - 2018/5/15
N2 - Photoelectrochemical (PEC) performances of the anatase TiO 2 films hydrothermally grown on the seeded fluorine-doped tin oxide (FTO) substrates are examined in this work. Structural characterizations of the TiO 2 films were conducted using Raman scattering spectroscopy. Although there is no obvious rutile peak appearing, an asymmetrical peak centered at ∼399 cm −1 was observed in the Raman spectra of the TiO 2 films deposited either on the low-temperature-formed seed layers or with low concentrations of Ti precursor. The asymmetrical Raman shift can be deconvoluted into the B 1g mode of anatase and E g mode of rutile TiO 2 peaks centered at ∼399 cm −1 and ∼447 cm −1 , respectively. Therefore, a minute quantity of rutile phase was inspected in the anatase film using Raman scattering spectroscopy. With the same light harvesting ability, we found that the PEC performance of the anatase TiO 2 film was significantly enhanced as the minute quantity of rutile phase existing in the film. It is ascribed to the formation of the anatase/rutile heterojunction which is beneficial to the charge separation in the photoanode.
AB - Photoelectrochemical (PEC) performances of the anatase TiO 2 films hydrothermally grown on the seeded fluorine-doped tin oxide (FTO) substrates are examined in this work. Structural characterizations of the TiO 2 films were conducted using Raman scattering spectroscopy. Although there is no obvious rutile peak appearing, an asymmetrical peak centered at ∼399 cm −1 was observed in the Raman spectra of the TiO 2 films deposited either on the low-temperature-formed seed layers or with low concentrations of Ti precursor. The asymmetrical Raman shift can be deconvoluted into the B 1g mode of anatase and E g mode of rutile TiO 2 peaks centered at ∼399 cm −1 and ∼447 cm −1 , respectively. Therefore, a minute quantity of rutile phase was inspected in the anatase film using Raman scattering spectroscopy. With the same light harvesting ability, we found that the PEC performance of the anatase TiO 2 film was significantly enhanced as the minute quantity of rutile phase existing in the film. It is ascribed to the formation of the anatase/rutile heterojunction which is beneficial to the charge separation in the photoanode.
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U2 - 10.1016/j.apsusc.2018.01.139
DO - 10.1016/j.apsusc.2018.01.139
M3 - Article
AN - SCOPUS:85041425113
VL - 440
SP - 125
EP - 132
JO - Applied Surface Science
JF - Applied Surface Science
SN - 0169-4332
ER -