TY - JOUR
T1 - Fabrication of visible-light-responsive titanium dioxide layer on titanium using anodic oxidization in nitric acid
AU - Ohtsu, Naofumi
AU - Kanno, Hirotaka
AU - Komiya, Shinji
AU - Mizukoshi, Yoshiteru
AU - Masahashi, Naoya
PY - 2013/4/1
Y1 - 2013/4/1
N2 - A visible-light-responsive titanium dioxide (TiO 2 ) layer was fabricated by anodizing a Ti plate in aqueous nitric acid (HNO 3 ) solutions, followed by annealing at 723 K for 5 h in air. The predominant structure of the oxide layer was TiO 2 with an anatase structure that contained ca. 1 at% of incorporated nitrogen. The crystallite size of the anatase TiO 2 was enlarged as anodizing voltage increased, but the atomic ratio of the incorporated nitrogen was almost constant. The TiO 2 layers could degrade methylene blue (MB) solution under an UV light at 370 nm, exhibiting photocatalytic activity. The activity increased monotonically as the crystallite size of the oxide increased. The TiO 2 layers with their crystallite size exceeding a specific value showed excellent response under visible light at 420, 450, and 505 nm. Overall, the results of this study showed that anodic oxidization of Ti in HNO 3 solution is a promising technique for fabrication of a visible-light-responsive TiO 2 layer.
AB - A visible-light-responsive titanium dioxide (TiO 2 ) layer was fabricated by anodizing a Ti plate in aqueous nitric acid (HNO 3 ) solutions, followed by annealing at 723 K for 5 h in air. The predominant structure of the oxide layer was TiO 2 with an anatase structure that contained ca. 1 at% of incorporated nitrogen. The crystallite size of the anatase TiO 2 was enlarged as anodizing voltage increased, but the atomic ratio of the incorporated nitrogen was almost constant. The TiO 2 layers could degrade methylene blue (MB) solution under an UV light at 370 nm, exhibiting photocatalytic activity. The activity increased monotonically as the crystallite size of the oxide increased. The TiO 2 layers with their crystallite size exceeding a specific value showed excellent response under visible light at 420, 450, and 505 nm. Overall, the results of this study showed that anodic oxidization of Ti in HNO 3 solution is a promising technique for fabrication of a visible-light-responsive TiO 2 layer.
KW - Anodic oxidation
KW - Nitrogen-doping
KW - Photocatalysis
KW - Titanium dioxide
KW - Visible-light response
UR - http://www.scopus.com/inward/record.url?scp=84875213371&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84875213371&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2013.01.071
DO - 10.1016/j.apsusc.2013.01.071
M3 - Article
AN - SCOPUS:84875213371
SN - 0169-4332
VL - 270
SP - 513
EP - 518
JO - Applied Surface Science
JF - Applied Surface Science
ER -