TiO2 nanotube layers: Dose effects during nitrogen doping by ion implantation

Ghicov, Andrei; Macák, Jan M.; Tsuchiya, Hiroaki; Kunze, Julia; Haeublein, Volker; Kleber, Sebastian; Schmuki, Patrik

doi:10.1016/j.cplett.2005.11.102

Cited by 115 publications

(77 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In contrast to these surfaceconfined sensitization protocols, bulk-doping of TiO 2 has also attracted significant interest. In the latter approach, 2 Advances in Physical Chemistry transition metals [86][87][88] or main-group elements like carbon [35,89], nitrogen [31,[90][91][92][93][94][95][96][97], and sulfur [98,99] are introduced into the lattice of titania resulting in formation of intrabandgap donor and acceptor levels, allowing thus for visible light (λ > 400 nm) excitation. Apart from the fields of solar cells and photocatalysis, the visible light-responsive TiO 2 materials opened up a route for further developments including photoelectrochemistry-based sensors [100,101] and light-addressable photoelectrochemical optoelectronic devices [102][103][104][105][106].…”

Section: Introductionmentioning

confidence: 99%

(Photo)electrochemical Methods for the Determination of the Band Edge Positions of TiO₂‐Based Nanomaterials

Beránek

2011

Advances in Physical Chemistry

307

183

View full text Add to dashboard Cite

TiO 2 -based nanomaterials play currently a major role in the development of novel photochemical systems and devices. One of the key parameters determining the photoactivity of TiO 2 -based materials is the position of the band edges. Although its knowledge is an important prerequisite for understanding and optimizing the performance of photochemical systems, it has been often rather neglected in recent research, particularly in the field of heterogeneous photocatalysis. This paper provides a concise account of main methods for the determination of the position of the band edges, particularly those suitable for measurements on nanostructured materials. In the first part, a survey of key photophysical and photochemical concepts necessary for understanding the energetics at the semiconductor/solution interface is provided. This is followed by a detailed discussion of several electrochemical, photoelectrochemical, and spectroelectrochemical methods that can be applied for the determination of band edge positions in compact and nanocrystalline thin films, as well as in nanocrystalline powders.

show abstract

Section: Introductionmentioning

confidence: 99%

(Photo)electrochemical Methods for the Determination of the Band Edge Positions of TiO₂‐Based Nanomaterials

Beránek

2011

Advances in Physical Chemistry

307

183

View full text Add to dashboard Cite

show abstract

“…[301] Ansatz (4) ist tatsächlich ein sehr zuverlässiger Weg, um NSpezies mit geringen bis mittleren Dotierungsgraden in das TiO 2 -Gitter einzubringen. [302,303] Nachteile dieses Verfahrens sind, dass die maximal erreichbaren Ionenflüsse bei Hochenergiebeschleunigern (die bei 50-1000 keV arbeiten) auf etwa 10 18 Ionen cm À2 beschränkt sind und die Implantationstiefe in das Substrat bei einer zudem leicht inhomogenen Verteilung der Dotierungssubstanz nur einige mm beträgt.…”

Section: Dotierungenunclassified

TiO₂‐Nanoröhren: Synthese und Anwendungen

2011

Self Cite

View full text Add to dashboard Cite

TiO2 ist eine der am besten untersuchten Verbindungen in den Materialwissenschaften und weist einige herausragende Eigenschaften auf, die z. B. für die Photokatalyse, für farbstoffsensibilisierte Solarzellen oder für biomedizinische Funktionseinheiten genutzt werden. 1999 zeigten erste Berichte, dass es möglich ist, hoch geordnete Anordnungen von TiO2‐Nanoröhren durch eine einfache, aber optimierte elektrochemische Anodisierung einer Ti‐Metallfolie herzustellen. Dies löste intensive Forschungsaktivitäten aus, deren Schwerpunkt auf der Herstellung und der Modifizierung sowie auf den Eigenschaften und Anwendungen dieser eindimensionalen Nanostrukturen lagen. Dieser Aufsatz geht auf all diese Aspekte und die zugrundeliegenden Prinzipien und funktionellen Haupteigenschaften von TiO2 ein und will außerdem versuchen, Entwicklungsperspektiven für das Gebiet aufzuzeigen.

show abstract

“…[15][16][17][18][19] This can be achieved by tailored anodization in neutral solutions containing NH 4 F 15-17 or NaF 18 or in glycerol/NH 4 F mixtures. 19 We have already used the nanotubular structures to dye-sensitize them in the visible light 4 or as a catalyst support for methanol electrochemical oxidation, 20 and we have shown how to use ion implantation 21,22 and thermal treatment to N-dope the tubes. 23 In the present work, we investigated length effect on photoresponse.…”

mentioning

confidence: 99%

Photoelectrochemical properties of N-doped self-organized titania nanotube layers with different thicknesses

et al. 2006

View full text Add to dashboard Cite

The present work reports nitrogen doping of self-organized TiO 2 nanotubular layers. Different thicknesses of the nanotubular layer architecture were formed by electrochemical anodization of Ti in different fluoride-containing electrolytes; tube lengths were 500 nm, 2.5 m, and 6.1 m. As-formed nanotube layers were annealed to an anatase structure and treated in ammonia environment at 550°C to achieve nitrogen doping. The crystal structure, morphology, composition and photoresponse of the N-doped were characterized by scanning electron microscopy, x-ray diffraction, x-ray photoelectron spectroscopy, and photoelectrochemical measurements. Results clearly show that successful N-doping of the TiO 2 nanotubular layers can be achieved upon ammonia treatment. The magnitude of the photoresponse in ultraviolet and visible light is strongly dependent on the thicknesses of the layers. This effect is ascribed to recombination effects along the tube length.

show abstract

TiO2 nanotube layers: Dose effects during nitrogen doping by ion implantation

Cited by 115 publications

References 20 publications

(Photo)electrochemical Methods for the Determination of the Band Edge Positions of TiO₂‐Based Nanomaterials

(Photo)electrochemical Methods for the Determination of the Band Edge Positions of TiO₂‐Based Nanomaterials

TiO₂‐Nanoröhren: Synthese und Anwendungen

Photoelectrochemical properties of N-doped self-organized titania nanotube layers with different thicknesses

Contact Info

Product

Resources

About

TiO2 nanotube layers: Dose effects during nitrogen doping by ion implantation

Cited by 115 publications

References 20 publications

(Photo)electrochemical Methods for the Determination of the Band Edge Positions of TiO2‐Based Nanomaterials

(Photo)electrochemical Methods for the Determination of the Band Edge Positions of TiO2‐Based Nanomaterials

TiO2‐Nanoröhren: Synthese und Anwendungen

Photoelectrochemical properties of N-doped self-organized titania nanotube layers with different thicknesses

Contact Info

Product

Resources

About

(Photo)electrochemical Methods for the Determination of the Band Edge Positions of TiO₂‐Based Nanomaterials

(Photo)electrochemical Methods for the Determination of the Band Edge Positions of TiO₂‐Based Nanomaterials

TiO₂‐Nanoröhren: Synthese und Anwendungen