Photoelectrochemical Activities of W-Doped Titania Nanotube Arrays Fabricated by Anodization

Zhao, Jianling; Wang, Xixin; Kang, Yingru; Xu, Xuewen; Li, Yangxian

doi:10.1109/lpt.2008.925529

Cited by 16 publications

(5 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To calculate the true optical HOMO–LUMO gap, E g , thin films of all the MQ z compounds were obtained by thermal evaporation. This was done to remove the solvatochromic effect caused by dipole interactions with the solvent, which modifies the UV–vis spectra. − The bandgap E g was obtained by extrapolation plots of absorbance vs E 1/2 to zero, ignoring the tail ( E = hc /λ). − These values are summarized in Table . The corresponding values for the molecules in solution are also included in the same table, for comparison.…”

Section: Resultsmentioning

confidence: 99%

Optical, Magnetic, Electrochemical, and Electrical Properties of 8-Hydroxyquinoline-Based Complexes with Al³⁺, Cr³⁺, Mn²⁺, Co²⁺, Ni²⁺, Cu²⁺, and Zn²⁺

2011

View full text Add to dashboard Cite

Metallic complexes containing the 8-hydroxyquinoline ligand were synthesized to investigate the effect of transition-metal ions on their electronic structure and electrical conductivity. The materials were characterized by UVÀvisible absorption spectroscopy, cyclic voltammetry, and electrical and magnetic measurements. Our results indicate that the π electrons localized on the ligands do not interact with the d electrons of the metal. The free ligand is electroactive only at very low and very high overpotentials. This trend is maintained when the ligands are part of the complexes. The 3d ions with an open-shell configuration, which are all in a high-spin state, show electron-transfer reactions lying in the middle of the potential window. Nevertheless, once in the solid state, these electroactive ions pin the Fermi level of the injecting electrode and act as charge traps. The mobility of electrons hopping among 3d levels is several orders of magnitude less than that of electrons hopping among the π* orbitals of the complexes with Al or Zn.

show abstract

Section: Resultsmentioning

confidence: 99%

Optical, Magnetic, Electrochemical, and Electrical Properties of 8-Hydroxyquinoline-Based Complexes with Al³⁺, Cr³⁺, Mn²⁺, Co²⁺, Ni²⁺, Cu²⁺, and Zn²⁺

2011

View full text Add to dashboard Cite

show abstract

“…Photochromic and electrochromic compounds (with a redox potential above the conduction band edge of titania) exhibit different colours in different oxidation states, and TiO 2 acts as an electron conductor between the conduction band and the photo/electrochromic material. Electrochromic devices like electrochromic windows, displays, contact lenses, catheters, and spectacles with TiO 2 as the electron conductors have been synthesised and commercialised [131,[216][217][218]. Also, biomedically, TiO 2 has shown much potential in cancer therapy (endoscopic-like instruments) due to its antitumor activity [92].…”

Section: Dye Sensitizersmentioning

confidence: 99%

Recent Developments in Environmental Photocatalytic Degradation of Organic Pollutants: The Case of Titanium Dioxide Nanoparticles—A Review

Mahlambi

Ngila

Mamba

2015

Journal of Nanomaterials

216

View full text Add to dashboard Cite

The presence of both organic and inorganic pollutants in water due to industrial, agricultural, and domestic activities has led to the global need for the development of new, improved, and advanced but effective technologies to effectively address the challenges of water quality. It is therefore necessary to develop a technology which would completely remove contaminants from contaminated waters. TiO2(titania) nanocatalysts have a proven potential to treat “difficult-to-remove” contaminants and thus are expected to play an important role in the remediation of environmental and pollution challenges. Titania nanoparticles are intended to be both supplementary and complementary to the present water-treatment technologies through the destruction or transformation of hazardous chemical wastes to innocuous end-products, that is, CO2and H2O. This paper therefore explores and summarizes recent efforts in the area of titania nanoparticle synthesis, modifications, and application of titania nanoparticles for water treatment purposes.

show abstract

“…While the transformation of the TiO 2 morphology to a nanotubular structure may contribute to certain improvements in the efficiency, nonetheless, it cannot solve essentially the central key issue of photocatalysis. 11 To this end, one of the most widely used strategies with regard to TiO 2 modifications normally focuses on doping with metallic [12][13][14][15][16] or non-metallic elements. [17][18][19][20][21][22][23][24][25][26][27][28][29][30] Notably, deposited metals (particularly, noble metals) could form an extrinsic energy level in the band gap of TiO 2 , which facilitates the efficient separation of the photogenerated electron-hole charge carriers under light irradiation, thus giving rise to remarkably enhanced photocatalytic performance.…”

Section: Introductionmentioning

confidence: 99%

Self-assembly preparation of gold nanoparticles-TiO2 nanotube arrays binary hybrid nanocomposites for photocatalytic applications

Xiao

2012

J. Mater. Chem.

View full text Add to dashboard Cite

Increasing interest has been devoted to preparing gold nanoparticle (GNP) functionalized TiO 2 nanotube array (TNTA) nanocomposites (GNP/TNTA) for photocatalytic applications. Nonetheless, achieving accurate control of surface assemblies of GNPs tethered on the TNTA substrate is far from satisfactory. Thus, in our work, applying 3-mercaptopropionic acid (MPA) as an interconnecting ligand, tailor-made monodispersed GNPs are evenly deposited on the interior and exterior surfaces of TNTAs with significant monodispersity via a self-assembly approach. The intrinsic self-assembly mechanism leading to the GNP/TNTA hybrid nanostructure is highlighted and ascertained. The photocatalytic performances of GNP/TNTAs are systematically evaluated in the photodegradation of organic dye pollutants under UV light irradiation. The ensemble of results indicates that the hierarchical nanostructure of the GNP/TNTA nanocomposite obtained via this self-assembly approach exhibits remarkably enhanced photocatalytic performance compared to its counterparts of P25 particulate film, a flat anodic TiO 2 layer (FTL), and GNP/FTL, in which well-dispersed GNPs and conducting titanium substrate are proposed to play crucial roles as efficient ''electron traps'' for the transfer of the photogenerated electrons and thus retard the recombination of photogenerated electron-hole pairs during the harvesting of photon-energy. In addition, the detection of increased amounts of highly active species (especially hydroxyl radicals) on the GNP/TNTAs by photoluminescence (PL) and electron spin resonance spectra (ESR) techniques further confirms the proposed mechanism. It is hoped that our knowledge regarding this simple self-assembly approach may cast new insight into the design and fabrication of noble-metal NPs/1-D nanotubular semiconductor hybrid nanomaterials for a wide range of photocatalytic applications.

show abstract

Photoelectrochemical Activities of W-Doped Titania Nanotube Arrays Fabricated by Anodization

Cited by 16 publications

References 15 publications

Optical, Magnetic, Electrochemical, and Electrical Properties of 8-Hydroxyquinoline-Based Complexes with Al³⁺, Cr³⁺, Mn²⁺, Co²⁺, Ni²⁺, Cu²⁺, and Zn²⁺

Optical, Magnetic, Electrochemical, and Electrical Properties of 8-Hydroxyquinoline-Based Complexes with Al³⁺, Cr³⁺, Mn²⁺, Co²⁺, Ni²⁺, Cu²⁺, and Zn²⁺

Recent Developments in Environmental Photocatalytic Degradation of Organic Pollutants: The Case of Titanium Dioxide Nanoparticles—A Review

Self-assembly preparation of gold nanoparticles-TiO2 nanotube arrays binary hybrid nanocomposites for photocatalytic applications

Contact Info

Product

Resources

About

Photoelectrochemical Activities of W-Doped Titania Nanotube Arrays Fabricated by Anodization

Cited by 16 publications

References 15 publications

Optical, Magnetic, Electrochemical, and Electrical Properties of 8-Hydroxyquinoline-Based Complexes with Al3+, Cr3+, Mn2+, Co2+, Ni2+, Cu2+, and Zn2+

Optical, Magnetic, Electrochemical, and Electrical Properties of 8-Hydroxyquinoline-Based Complexes with Al3+, Cr3+, Mn2+, Co2+, Ni2+, Cu2+, and Zn2+

Recent Developments in Environmental Photocatalytic Degradation of Organic Pollutants: The Case of Titanium Dioxide Nanoparticles—A Review

Self-assembly preparation of gold nanoparticles-TiO2 nanotube arrays binary hybrid nanocomposites for photocatalytic applications

Contact Info

Product

Resources

About

Optical, Magnetic, Electrochemical, and Electrical Properties of 8-Hydroxyquinoline-Based Complexes with Al³⁺, Cr³⁺, Mn²⁺, Co²⁺, Ni²⁺, Cu²⁺, and Zn²⁺

Optical, Magnetic, Electrochemical, and Electrical Properties of 8-Hydroxyquinoline-Based Complexes with Al³⁺, Cr³⁺, Mn²⁺, Co²⁺, Ni²⁺, Cu²⁺, and Zn²⁺