PMID- 37744782
OWN - NLM
STAT- Publisher
LR  - 20230926
IS  - 2470-1343 (Electronic)
IS  - 2470-1343 (Linking)
VI  - 8
IP  - 37
DP  - 2023 Sep 19
TI  - The Role of Lattice Defects on the Optical Properties of TiO(2) Nanotube Arrays 
      for Synergistic Water Splitting.
PG  - 33255-33265
LID - 10.1021/acsomega.3c00965 [doi]
AB  - In this study, we report a facile one-step chemical method to synthesize reduced 
      titanium dioxide (TiO(2)) nanotube arrays (NTAs) with point defects. Treatment 
      with NaBH(4) introduces oxygen vacancies (OVs) in the TiO(2) lattice. Chemical 
      analysis and optical studies indicate that the OV density can be significantly 
      increased by changing reduction time treatment, leading to higher optical 
      transmission of the TiO(2) NTAs and retarded carrier recombination in the 
      photoelectrochemical process. A cathodoluminescence (CL) study of reduced TiO(2) 
      (TiO(2-x)) NTAs revealed that OVs contribute significantly to the emission bands 
      in the visible range. It was found that the TiO(2) NTAs reduced for a longer 
      duration exhibited a higher concentration of OVs. A typical CL spectrum of TiO(2) 
      was deconvoluted to four Gaussian components, assigned to F, F(+), and Ti(3+) 
      centers. X-ray photoelectron spectroscopy measurements were used to support the 
      change in the surface chemical bonding and electronic valence band position in 
      TiO(2). Electron paramagnetic resonance spectra confirmed the presence of OVs in 
      the TiO(2-x) sample. The prepared TiO(2-x) NTAs show an enhanced photocurrent for 
      water splitting due to pronounced light absorption in the visible region, 
      enhanced electrical conductivity, and improved charge transportation.
CI  - (c) 2023 The Authors. Published by American Chemical Society.
FAU - Machreki, Manel
AU  - Machreki M
AD  - Materials Research Laboratory, University of Nova Gorica, Vipavska 11c, 5270 
      Ajdovscina, Slovenia.
FAU - Chouki, Takwa
AU  - Chouki T
AUID- ORCID: 0000-0003-2293-0260
AD  - Materials Research Laboratory, University of Nova Gorica, Vipavska 11c, 5270 
      Ajdovscina, Slovenia.
FAU - Tyuliev, Georgi
AU  - Tyuliev G
AD  - Institute of Catalysis, Bulgarian Academy of Sciences, Acad. G. Bonchev St., 
      Bldg. 11, Sofia 1113, Bulgaria.
FAU - Fanetti, Mattia
AU  - Fanetti M
AUID- ORCID: 0000-0002-2437-5179
AD  - Materials Research Laboratory, University of Nova Gorica, Vipavska 11c, 5270 
      Ajdovscina, Slovenia.
FAU - Valant, Matjaz
AU  - Valant M
AUID- ORCID: 0000-0003-4842-5676
AD  - Materials Research Laboratory, University of Nova Gorica, Vipavska 11c, 5270 
      Ajdovscina, Slovenia.
FAU - Arcon, Denis
AU  - Arcon D
AUID- ORCID: 0000-0002-1207-8337
AD  - Institute "Jozef Stefan", Jamova 39, 1000 Ljubljana, Slovenia.
AD  - Faculty of Mathematics and Physics, University of Ljubljana, Jadranska c. 19, 
      SI-1000 Ljubljana, Slovenia.
FAU - Pregelj, Matej
AU  - Pregelj M
AD  - Institute "Jozef Stefan", Jamova 39, 1000 Ljubljana, Slovenia.
FAU - Emin, Saim
AU  - Emin S
AUID- ORCID: 0000-0003-1918-3997
AD  - Materials Research Laboratory, University of Nova Gorica, Vipavska 11c, 5270 
      Ajdovscina, Slovenia.
LA  - eng
PT  - Journal Article
DEP - 20230901
PL  - United States
TA  - ACS Omega
JT  - ACS omega
JID - 101691658
PMC - PMC10515401
COIS- The authors declare no competing financial interest.
EDAT- 2023/09/25 06:42
MHDA- 2023/09/25 06:42
PMCR- 2023/09/01
CRDT- 2023/09/25 04:49
PHST- 2023/02/13 00:00 [received]
PHST- 2023/08/08 00:00 [accepted]
PHST- 2023/09/25 06:42 [medline]
PHST- 2023/09/25 06:42 [pubmed]
PHST- 2023/09/25 04:49 [entrez]
PHST- 2023/09/01 00:00 [pmc-release]
AID - 10.1021/acsomega.3c00965 [doi]
PST - epublish
SO  - ACS Omega. 2023 Sep 1;8(37):33255-33265. doi: 10.1021/acsomega.3c00965. 
      eCollection 2023 Sep 19.