%0 Journal Article %1 chen2015electronic %A Chen, Chi Liang %A Dong, Chung-Li %A Chen, Chia-Hao %A Wu, Jen-Wei %A Lu, Ying-Rui %A Lin, Chin-Jung %A Ya Hsuan Liou, Sofia %A Tseng, Chuan-Ming %A Kumar, Krishna %A Wei, Da-Hua %A Guo, Jinghua %A Chou, Wu-Ching %A Wu, Maw-Kuen %D 2015 %J Physical chemistry chemical physics : PCCP %K chemistry %N 34 %P 2264 - 2271 %T Electronic properties of free-standing TiO2 nanotube arrays fabricated by electrochemical anodization %U http://pubs.rsc.org/en/Content/ArticleLanding/2015/CP/C5CP02888D#!divAbstract %V 17 %X Nanotubular TiO2 has attracted considerable attention owing to its unique functional properties, including high surface area and vectorial charge transport along the nanotube, making it a good photocatalytic material. Anodic TiO2-nanotube (TiNT) arrays on a Ti foil substrate were prepared by electrochemical anodic oxidation and SEM/HRTEM/XRD analyses have suggested that the walls of TiO2 tubes are formed from stacked 101 planes (anatase). Both HRTEM and XRD indicate an interplanar spacing of d101 = 0.36 nm in the wall structure. Despite the large amount of work done on nanotube synthesis, a thorough investigation of the electronic and atomic structures of free-standing TiNT arrays has not yet been carried out. X-ray absorption spectroscopy (XAS), resonant inelastic X-ray scattering (RIXS) and scanning photoelectron microscopy (SPEM) are employed herein to examine the electronic and atomic structures at the top and bottom of TiNT arrays. These analyses demonstrate the presence of mixed valence states of the Ti ions (Ti(3+) and Ti(4+)) and a structural distortion at the bottom cap region of the TiNT. Additionally, the results obtained herein suggest the formation of a defective anatase phase at the bottom cap barrier layer between the Ti foil substrate and TiNT during the growth of electrochemically anodized nanotubes. PubMed Nanotubular TiO 2 has attracted considerable attention owing to its unique functional properties, including high surface area and vectorial charge transport along the nanotube, making it a good photocatalytic material. Anodic TiO 2 -nanotube (TiNT) arrays on a Ti foil substrate were prepared by electrochemical anodic oxidation and SEM/HRTEM/XRD analyses have suggested that the walls of TiO 2 tubes are formed from stacked 101 planes (anatase). Both HRTEM and XRD indicate an interplanar spacing of d 101 = 0.36 nm in the wall structure. Despite the large amount of work done on nanotube synthesis, a thorough investigation of the electronic and atomic structures of free-standing TiNT arrays has not yet been carried out. X-ray absorption spectroscopy (XAS), resonant inelastic X-ray scattering (RIXS) and scanning photoelectron microscopy (SPEM) are employed herein to examine the electronic and atomic structures at the top and bottom of TiNT arrays. These analyses demonstrate the presence of mixed valence states of the Ti ions (Ti 3+ and Ti 4+ ) and a structural distortion at the bottom cap region of the TiNT. Additionally, the results obtained herein suggest the formation of a defective anatase phase at the bottom cap barrier layer between the Ti foil substrate and TiNT during the growth of electrochemically anodized nanotubes. Different electronic structures between the top and bottom of TiNT revealed by XAS, SPEM, and RIXS.

@article{chen2015electronic, abstract = {Nanotubular TiO2 has attracted considerable attention owing to its unique functional properties, including high surface area and vectorial charge transport along the nanotube, making it a good photocatalytic material. Anodic TiO2-nanotube (TiNT) arrays on a Ti foil substrate were prepared by electrochemical anodic oxidation and SEM/HRTEM/XRD analyses have suggested that the walls of TiO2 tubes are formed from stacked [101] planes (anatase). Both HRTEM and XRD indicate an interplanar spacing of d101 = 0.36 nm in the wall structure. Despite the large amount of work done on nanotube synthesis, a thorough investigation of the electronic and atomic structures of free-standing TiNT arrays has not yet been carried out. X-ray absorption spectroscopy (XAS), resonant inelastic X-ray scattering (RIXS) and scanning photoelectron microscopy (SPEM) are employed herein to examine the electronic and atomic structures at the top and bottom of TiNT arrays. These analyses demonstrate the presence of mixed valence states of the Ti ions (Ti(3+) and Ti(4+)) and a structural distortion at the bottom cap region of the TiNT. Additionally, the results obtained herein suggest the formation of a defective anatase phase at the bottom cap barrier layer between the Ti foil substrate and TiNT during the growth of electrochemically anodized nanotubes. PubMed Nanotubular TiO 2 has attracted considerable attention owing to its unique functional properties, including high surface area and vectorial charge transport along the nanotube, making it a good photocatalytic material. Anodic TiO 2 -nanotube (TiNT) arrays on a Ti foil substrate were prepared by electrochemical anodic oxidation and SEM/HRTEM/XRD analyses have suggested that the walls of TiO 2 tubes are formed from stacked [101] planes (anatase). Both HRTEM and XRD indicate an interplanar spacing of d 101 = 0.36 nm in the wall structure. Despite the large amount of work done on nanotube synthesis, a thorough investigation of the electronic and atomic structures of free-standing TiNT arrays has not yet been carried out. X-ray absorption spectroscopy (XAS), resonant inelastic X-ray scattering (RIXS) and scanning photoelectron microscopy (SPEM) are employed herein to examine the electronic and atomic structures at the top and bottom of TiNT arrays. These analyses demonstrate the presence of mixed valence states of the Ti ions (Ti 3+ and Ti 4+ ) and a structural distortion at the bottom cap region of the TiNT. Additionally, the results obtained herein suggest the formation of a defective anatase phase at the bottom cap barrier layer between the Ti foil substrate and TiNT during the growth of electrochemically anodized nanotubes. Different electronic structures between the top and bottom of TiNT revealed by XAS, SPEM, and RIXS.}, added-at = {2015-11-25T13:57:44.000+0100}, author = {Chen, Chi Liang and Dong, Chung-Li and Chen, Chia-Hao and Wu, Jen-Wei and Lu, Ying-Rui and Lin, Chin-Jung and Ya Hsuan Liou, Sofia and Tseng, Chuan-Ming and Kumar, Krishna and Wei, Da-Hua and Guo, Jinghua and Chou, Wu-Ching and Wu, Maw-Kuen}, biburl = {https://www.bibsonomy.org/bibtex/2f9ba477fda6d06466c6e1a0cf1d8c74f/libraryitt}, interhash = {b1045d92e7474b9397885a13a883a3ce}, intrahash = {f9ba477fda6d06466c6e1a0cf1d8c74f}, journal = {Physical chemistry chemical physics : PCCP}, keywords = {chemistry}, month = aug, number = 34, pages = {2264 - 2271}, timestamp = {2015-11-25T13:57:44.000+0100}, title = {Electronic properties of free-standing TiO2 nanotube arrays fabricated by electrochemical anodization}, url = {http://pubs.rsc.org/en/Content/ArticleLanding/2015/CP/C5CP02888D#!divAbstract}, volume = 17, year = 2015 }