Atomic layer deposition of titanium dioxide nanostructures using carbon nanosheets as a template

Rooth, Mårten; Quinlan, Ronald A.; Widenkvist, Erika; Lu, Jun; Grennberg, Helena; Holloway, Brian C.; Hårsta, Anders; Jansson, Ulf

doi:10.1016/j.jcrysgro.2008.10.035

Cited by 23 publications

(17 citation statements)

References 16 publications

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“…It can be observed that calcination of the film did not lead to destruction of the sheet structure and the overall original template morphology was retained. The image of the as-deposited sample is in good agreement with similar coated structures reported in literature [36,37]. The TEM detail demonstrates that after calcination the TiO 2 layers are now arranged as a network of crystalline nanoparticles.…”

Section: Catalyst Characterizationsupporting

confidence: 88%

Photocatalytic acetaldehyde oxidation in air using spacious TiO2 films prepared by atomic layer deposition on supported carbonaceous sacrificial templates

Verbruggen

Deng

Kurttepeli

et al. 2014

Applied Catalysis B: Environmental

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Supported carbon nanosheets and carbon nanotubes served as sacrificial templates for preparing spacious TiO 2 photocatalytic thin films. Amorphous TiO 2 was deposited conformally on the carbonaceous template material by atomic layer deposition (ALD). Upon calcination at 550°C, the carbon template was oxidatively removed and the as-deposited continuous amorphous TiO 2 layers transformed into interlinked anatase nanoparticles with an overall morphology commensurate to the original template structure. The effect of type of template, number of ALD cycles and gas residence time of pollutant on the photocatalytic activity, as well as the stability of the photocatalytic performance of these thin films was investigated. The TiO 2 films exhibited excellent photocatalytic activity towards photocatalytic degradation of acetaldehyde in air as a model reaction for photocatalytic indoor air pollution abatement. Optimized films outperformed a reference film of commercial PC500.

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Section: Catalyst Characterizationsupporting

confidence: 88%

Photocatalytic acetaldehyde oxidation in air using spacious TiO2 films prepared by atomic layer deposition on supported carbonaceous sacrificial templates

Verbruggen

Deng

Kurttepeli

et al. 2014

Applied Catalysis B: Environmental

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“…[5][6][7] Atomic layer deposition (ALD) is an alternative method to produce TiO 2 with a large surface area using a template structure. 8 Amongst others, carbon nanosheets (CNSs) are widely used as templates for metal/metal oxide depositions due to their distinct properties, such as high surface area. As illustrated in Fig.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Photoreactive TiO₂–Carbon Nanosheet Composites

et al. 2014

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We report the atomic layer deposition of titanium dioxide on carbon nanosheet templates and investigate the effects of post-deposition annealing in a helium environment using different characterization techniques. The crystallization of the titanium dioxide coating upon annealing is observed using in-situ X-ray diffraction. The (micro)-structural characterization of the films is carried out by scanning electron microscopy and advanced transmission electron microscopy techniques. Our study shows that the annealing of the atomic layer deposition processed and carbon nanosheets templated titanium dioxide layers in helium environment results in the formation of a porous, nanocrystalline and photocatalytically active titanium dioxide-carbon nanosheet composite film. Such composites are suitable for photocatalysis and dye-sensitized solar cells applications.KEYWORDS titanium dioxide, atomic layer deposition, transmission electron microscopy, photocatalysis, electron tomography. ConclusionsThis study demonstrates the influence of annealing on ALD processed TiO 2 nanostructured films in an inert gas (helium) environment. The morphology of the film was visualized using conventional TEM imaging techniques, whereas the complex 3D structure of TiO 2 nanostructured films was revealed by HAADF-STEM electron tomography. The annealing was found to cause the ALD processed film to undergo a phase transformation from amorphous to anatase TiO 2 . The calcination resulted in highly crystalline TiO 2 nanostructures with a porous network and a large surface area, which are desirable properties for photocatalytic and photovoltaics applications. TEM characterization indicated that the removal of carbon nanosheets template is hindered, and thin, porous, nanocrystalline and photocatalytically active TiO 2 -carbon nanosheets composite material is produced.

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“…This aspect is most likely related to a difficult nucleation of the film on the substrate. [11] Structural information is obtained by diffraction 55 of the X-ray beam in grazing incidence geometry (GIXRD, Figure 2a). The grazing incidence is used here to avoid all substrate diffractions, which are otherwise so prevalent that they obscure the peaks due to the film analyzed.…”

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confidence: 99%

Stoichiometry of Nickel Oxide Films Prepared by ALD

Bachmann¹,

Zolotaryov²,

Albrecht³

et al. 2011

Chemical Vapor Deposition

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Atomic layer deposition of titanium dioxide nanostructures using carbon nanosheets as a template

Cited by 23 publications

References 16 publications

Photocatalytic acetaldehyde oxidation in air using spacious TiO2 films prepared by atomic layer deposition on supported carbonaceous sacrificial templates

Photocatalytic acetaldehyde oxidation in air using spacious TiO2 films prepared by atomic layer deposition on supported carbonaceous sacrificial templates

Synthesis and Characterization of Photoreactive TiO₂–Carbon Nanosheet Composites

Stoichiometry of Nickel Oxide Films Prepared by ALD

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Atomic layer deposition of titanium dioxide nanostructures using carbon nanosheets as a template

Cited by 23 publications

References 16 publications

Photocatalytic acetaldehyde oxidation in air using spacious TiO2 films prepared by atomic layer deposition on supported carbonaceous sacrificial templates

Photocatalytic acetaldehyde oxidation in air using spacious TiO2 films prepared by atomic layer deposition on supported carbonaceous sacrificial templates

Synthesis and Characterization of Photoreactive TiO2–Carbon Nanosheet Composites

Stoichiometry of Nickel Oxide Films Prepared by ALD

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Synthesis and Characterization of Photoreactive TiO₂–Carbon Nanosheet Composites