title: Selective removal of the outer shells of anodic TiO2 nanotubes.
abstract: A facile electrochemical method to selectively remove the outer walls of anodic TiO(2)  nanotubes by leaving the as-anodized nanotubes in the same electrolyte and applying an electric field parallel to the anodic film for several minutes is reported. The better-separated single-walled TiO(2)  nanotubes thus obtained show significantly improved photocatalytic efficiency compared with their non-etched counterparts.
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong, 83 Tat Chee Avenue, Hong Kong.
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.forename: Jian-Wen
authors.initials: JW
authors.lastname: Cheng
authors.forename: Shiwei
authors.initials: S
authors.lastname: Shu
authors.forename: Jie
authors.initials: J
authors.lastname: Zhang
authors.forename: Lingxia
authors.initials: L
authors.lastname: Zheng
authors.forename: Chun Kwan
authors.initials: CK
authors.lastname: Tsang
authors.forename: Hua
authors.initials: H
authors.lastname: Cheng
authors.forename: Fengxia
authors.initials: F
authors.lastname: Liang
authors.forename: Shuit-Tong
authors.initials: ST
authors.lastname: Lee
authors.forename: Yang Yang
authors.initials: YY
authors.lastname: Li
mesh_terms: D002384:Catalysis; D004560:Electricity; D004563:Electrochemistry / Q000379:methods; D004566:Electrodes; D004573:Electrolytes; D004867:Equipment Design; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning / Q000379:methods; D036103:Nanotechnology / Q000379:methods*; D043942:Nanotubes / Q000737:chemistry*; D010777:Photochemistry / Q000379:methods; D014025:Titanium / Q000737:chemistry*
chemical_list: D004573:Electrolytes; C009495:titanium dioxide; D014025:Titanium