Journal ArticleDOI
Preparation and photoluminescence of highly ordered TiO2 nanowire arrays
Yong Lei,Lide Zhang,Guowen Meng,Guanghai Li,Xinyi Y Zhang,Changhao Liang,Weixi Chen,Suyuan Wang +7 more
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TLDR
In this paper, the photoluminescence (PL) measurements of TiO2 nanowire arrays show a visible broadband with three peaks at about 425, 465, and 525 nm that are attributed to self-trapped excitons, F, and F+ centers, respectively.Abstract:
Highly ordered TiO2 nanowire (TN) arrays were prepared in anodic alumina membranes (AAMs) by a sol-gel method. The TNs are single crystalline anatase phase with uniform diameters around 60 nm. At room temperature, photoluminescence (PL) measurements of the TN arrays show a visible broadband with three peaks, which are located at about 425, 465, and 525 nm that are attributed to self-trapped excitons, F, and F+ centers, respectively. A model is also presented to explain the PL intensity drop-down of the TN arrays embedded in AAMs: the blue PL band of AAMs arises from the F+ centers on the pore walls, and the TNs first form in the center area of the pores and then extend to the pore walls.read more
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A surface science perspective on TiO2 photocatalysis
TL;DR: The field of surface science provides a unique approach to understand bulk, surface and interfacial phenomena occurring during TiO2 photocatalysis as mentioned in this paper, including photon absorption, charge transport and trapping, electron transfer dynamics, adsorbed state, mechanisms, poisons and promoters, and phase and form.
Journal ArticleDOI
Effect of nature and location of defects on bandgap narrowing in black TiO2 nanoparticles.
Alberto Naldoni,Mattia Allieta,Saveria Santangelo,Marcello Marelli,Filippo Fabbri,S. Cappelli,Claudia L. Bianchi,Rinaldo Psaro,Vladimiro Dal Santo +8 more
TL;DR: It is demonstrated that black TiO(2) nanoparticles obtained through a one-step reduction/crystallization process exhibit a bandgap of only 1.85 eV, which matches well with visible light absorption.
Journal ArticleDOI
Vertically aligned single crystal TiO2 nanowire arrays grown directly on transparent conducting oxide coated glass: synthesis details and applications
Xinjian Feng,Karthik Shankar,Oomman K. Varghese,Maggie Paulose,Thomas J. LaTempa,Craig A. Grimes +5 more
TL;DR: This work presents a straightforward low temperature method to prepare single crystal rutile TiO2 nanowire arrays up to 5 microm long on TCO glass via a non-polar solvent/hydrophilic substrate interfacial reaction under mild hydrothermal conditions.
Journal ArticleDOI
Porous anodic aluminum oxide: anodization and templated synthesis of functional nanostructures.
Woo Lee,Sang-Joon Park +1 more
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Is the Band Gap of Pristine TiO2 Narrowed by Anion- and Cation-Doping of Titanium Dioxide in Second-Generation Photocatalysts?
TL;DR: It is argued that the red-shift of the absorption edge is in fact due to formation of the color centers, and that while band gap narrowing is not an unknown occurrence in semiconductor physics it does necessitate heavy doping of the metal oxide semiconductor, thereby producing materials that may have completely different chemical compositions from that of TiO(2) with totally different band gap electronic structures.
References
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Journal ArticleDOI
A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films
TL;DR: In this article, the authors describe a photovoltaic cell, created from low-to medium-purity materials through low-cost processes, which exhibits a commercially realistic energy-conversion efficiency.
Journal ArticleDOI
Nanomaterials: a membrane-based synthetic approach.
TL;DR: A relatively new method for preparing nanomaterials, membrane-based synthesis, is reviewed, which entails synthesis of the desired material within the pores of a nanoporous membrane.
Journal ArticleDOI
Size Effects on the Photophysical Properties of Colloidal Anatase TiO2 Particles: Size Quantization versus Direct Transitions in This Indirect Semiconductor?
Journal ArticleDOI
Anodic oxide films on aluminum
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Fabrication of gold nanodot array using anodic porous alumina as an evaporation mask
Hideki Masuda,Masahiro Satoh +1 more
TL;DR: In this paper, a highly ordered gold nanodot array was fabricated by vacuum evaporation using an anodic porous alumina membrane with through-holes of nanometer scale as a mask.
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