Visible light active C-doped titanate nanotubes prepared via alkaline hydrothermal treatment of C-doped nanoparticulate TiO2: Photo-electrochemical and photocatalytic properties

Abstract

Publication informationJournal of Photochemistry and Photobiology A-Chemistry, 267 : 17-24Publisher Elsevier Item record/more information

Assessing the photoelectrochemical properties of C, N, F codoped TiO 2 nanotubes of different lengths

“…The main peak around 285 eV is assigned to adventitious carbon (C C). Peaks at lower binding energies (282-283 eV) have been assigned to substitutional C species [35,36], which our analysis attributes to the sputtering process itself. The peaks at 289 and 286.5 eV are usually assigned to C O and C O species [34], respectively, therefore we suggest that C is incorporated interstitially in the TiO 2 lattice.…”

“…For C and N there is general disagreement among researchers on whether the observation of these elements in XPS analysis should be assigned to successful anion doping [33][34][35], but there is a consensus that C and N peaks at lower binding energies (about 397 eV) arise from occupation of anionic sites in titania [16,36]. In a recent publication by Mazierski et al [37], the N 1 s signal at 400.7 eV is assigned to doping in the form of O-Ti-N and/or Ti-O-N, and a number of relevant works are cited.…”

“…On the other hand, Varghese et al [26,38] repeatedly points out that substitutional N doping is evidenced with N 1 s peaks at binding energies of about 397 eV. Many researchers use Ar + sputtering in order to remove surface contaminants and study the chemical composition underneath the surface [35,38,39]. A general problem is that XPS results of undoped samples are omitted or not given, as the absence of these peaks is implied.…”

Effect of Morphology on the Photoelectrochemical Activity of TiO2 Self-Organized Nanotube Arrays

“…This template-assisted requirement limits the choice of substrates and requires post-processing in order to separate the TiO 2 nanotubes from the template, in which the as-prepared TiO 2 nanotube arrays may break [22]. On the other hand, the hydrothermal synthesis technique consists of the hydrothermal treatment of titanium dioxide solutions followed by post-annealing treatment, and results in the non-ordered distribution of the TiO 2 nanotubes [23]. Among these methods, the electrochemical anodization route is widely investigated, and has attracted great interest since the growth of the very first highly ordered titanium dioxide by Zwilling et al in 1999 [24,25].…”

Thermal Stability on Morphology and Crystal Structures of Hydrothermally Synthesized Titanate Nanotubes and Their Photocatalytic Activity

“…The exploitation of this material in the photochemical and sensor are also appears promising [8][9][10]. However, high temperature within the range of 100-700 °C are necessary in these applications, for example, for oxygen sensors in car exhaust management.…”