Preparation and characterization of nitrogen-doped highly ordered titanium dioxide nanotubes (N-doped-HOTN): How far it will improve toward the visible light response and why?

A. D. Pangestuti, Jarnuzi Gunlazuardi

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Titanium dioxide (TiO2), a semiconductor having a band gap of 3.0 - 3.2 eV, can be an active photo anode under UV light (wave length < 410 nm). Since that light region only presents in a small fraction of the solar light reached the earth surface, the TiO2, as it is, is less useful for solar energy conversion. Abundant efforts have been conducting by researcher to improve its activity toward solar light. The improvement of its morphology, to obtain a high surface area, and its electronic structure, to shorten the band gap have been a main task reported, regularly. Recently, our group developed a simple way to prepare the highly ordered TiO2 nanotubes (HOTN), by the mean of anodization process, followed by calcinations. In the course of the development, we find another possible easy way to dope nitrogen during the anodization and calcinations processes. The HOTN was prepared by electrochemical oxidation (at certain voltage) of Ti plate in an electrolyte containing ethylene glycol, NH4F, urea, and water, to obtain amorphous HOTN. The fresh HOTN was then calcinated at certain condition (typically 4500C) for a phase transition and nitrogen incorporation (replacing some of oxygen in the anatase phase). The obtained crystalline phase of HOTN film was then characterized by the mean of spectroscopic (UV-DRS, FTIR, XRD, SEM) and photoelectrochemical methods. The results revealed that by the mentioned process a HOTN film having a band gap as low as 2.9 eV can be obtained, designed as N doped HOTN. The nitrogen doped HOTN showed a characteristic of IR peak related to -Ti-N- and -Ti-O-N as well, indicating mixture nitrogen doped which lead to shorten the band gap and the one is not. So far, the anatase crystalline phase was not disturbed by the presence of nitrogen. The obtained nitrogen doped HOTN showed a higher photocurrent under visible light compared to those of bare HOTN.

Original languageEnglish
Title of host publicationProceedings of the 3rd International Symposium on Current Progress in Mathematics and Sciences 2017, ISCPMS 2017
EditorsRatna Yuniati, Terry Mart, Ivandini T. Anggraningrum, Djoko Triyono, Kiki A. Sugeng
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735417410
DOIs
Publication statusPublished - 22 Oct 2018
Event3rd International Symposium on Current Progress in Mathematics and Sciences 2017, ISCPMS 2017 - Bali, Indonesia
Duration: 26 Jul 201727 Jul 2017

Publication series

NameAIP Conference Proceedings
Volume2023
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference3rd International Symposium on Current Progress in Mathematics and Sciences 2017, ISCPMS 2017
CountryIndonesia
CityBali
Period26/07/1727/07/17

Keywords

  • anodization
  • nitrogen
  • titanium dioxide

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