Co-catalytic Absorption Layers for Controlled Laser-Induced Chemical Vapor Deposition of Carbon Nanotubes

Michaelis, Frances B.; Weatherup, Robert S.; Bayer, Bernhard C.; Bock, Maximilian; Sugime, Hisashi; Caneva, Sabina; Robertson, John; Baumberg, Jeremy J.; Hofmann, Stephan

doi:10.1021/am405460r

Cited by 13 publications

(11 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Possible degradation scenarios include exposure to visible light radiation or heating to elevated temperatures in ambient atmosphere [30]. In order to study the stability of our PVD MoS 2 films, we employed in situ laser annealing [39–40] in ambient air coupled with Raman spectroscopic investigations (Fig. 4).…”

Section: Resultsmentioning

confidence: 99%

Growth, structure and stability of sputter-deposited MoS₂ thin films

Kaindl¹,

Bayer²,

Resel³

et al. 2017

Beilstein J. Nanotechnol.

View full text Add to dashboard Cite

Molybdenum disulphide (MoS2) thin films have received increasing interest as device-active layers in low-dimensional electronics and also as novel catalysts in electrochemical processes such as the hydrogen evolution reaction (HER) in electrochemical water splitting. For both types of applications, industrially scalable fabrication methods with good control over the MoS2 film properties are crucial. Here, we investigate scalable physical vapour deposition (PVD) of MoS2 films by magnetron sputtering. MoS2 films with thicknesses from ≈10 to ≈1000 nm were deposited on SiO2/Si and reticulated vitreous carbon (RVC) substrates. Samples deposited at room temperature (RT) and at 400 °C were compared. The deposited MoS2 was characterized by macro- and microscopic X-ray, electron beam and light scattering, scanning and spectroscopic methods as well as electrical device characterization. We find that room-temperature-deposited MoS2 films are amorphous, of smooth surface morphology and easily degraded upon moderate laser-induced annealing in ambient conditions. In contrast, films deposited at 400 °C are nano-crystalline, show a nano-grained surface morphology and are comparatively stable against laser-induced degradation. Interestingly, results from electrical transport measurements indicate an unexpected metallic-like conduction character of the studied PVD MoS2 films, independent of deposition temperature. Possible reasons for these unusual electrical properties of our PVD MoS2 thin films are discussed. A potential application for such conductive nanostructured MoS2 films could be as catalytically active electrodes in (photo-)electrocatalysis and initial electrochemical measurements suggest directions for future work on our PVD MoS2 films.

show abstract

Section: Resultsmentioning

confidence: 99%

Growth, structure and stability of sputter-deposited MoS₂ thin films

Kaindl¹,

Bayer²,

Resel³

et al. 2017

Beilstein J. Nanotechnol.

View full text Add to dashboard Cite

show abstract

“… 34 This reshaping effect is in turn related to the carbon concentration in the catalyst as discussed in previous literature. 56 − 58 Furthermore, the interaction of the nanoparticulate catalyst with the support is of key importance in CNT formation, 35 , 59 − 61 and support-dependent changes in the catalyst carbon concentration and hence growth outcome have been observed. 18 , 62 , 63 …”

Section: Discussionmentioning

confidence: 99%

Interdependency of Subsurface Carbon Distribution and Graphene–Catalyst Interaction

et al. 2014

Self Cite

View full text Add to dashboard Cite

The dynamics of the graphene–catalyst interaction during chemical vapor deposition are investigated using in situ, time- and depth-resolved X-ray photoelectron spectroscopy, and complementary grand canonical Monte Carlo simulations coupled to a tight-binding model. We thereby reveal the interdependency of the distribution of carbon close to the catalyst surface and the strength of the graphene–catalyst interaction. The strong interaction of epitaxial graphene with Ni(111) causes a depletion of dissolved carbon close to the catalyst surface, which prevents additional layer formation leading to a self-limiting graphene growth behavior for low exposure pressures (10–6–10–3 mbar). A further hydrocarbon pressure increase (to ∼10–1 mbar) leads to weakening of the graphene–Ni(111) interaction accompanied by additional graphene layer formation, mediated by an increased concentration of near-surface dissolved carbon. We show that growth of more weakly adhered, rotated graphene on Ni(111) is linked to an initially higher level of near-surface carbon compared to the case of epitaxial graphene growth. The key implications of these results for graphene growth control and their relevance to carbon nanotube growth are highlighted in the context of existing literature.

show abstract

“…53 The same mechanism has been reported with Fe-Ta catalyst as the solid-state reduction. [54][55] The annealing in the presence of a reduction gas, as H 2 and/or NH 3 , enhances the fraction of metallic Co, which is active state to grow CNTs. A similar behaviour is also found in the analysis of the Mo 3d level.…”

Section: Figure 1amentioning

confidence: 99%

Low-Temperature Growth of Carbon Nanotube Forests Consisting of Tubes with Narrow Inner Spacing Using Co/Al/Mo Catalyst on Conductive Supports

Sugime

Esconjauregui

D’Arsié

et al. 2015

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

We grow dense carbon nanotube forests at 450 °C on Cu support using Co/Al/Mo multilayer catalyst. As a partial barrier layer for the diffusion of Co into Mo, we apply very thin Al layer with the nominal thickness of 0.50 nm between Co and Mo. This Al layer plays an important role in the growth of dense CNT forests, partially preventing the Co-Mo interaction. The forests have an average height of ∼300 nm and a mass density of 1.2 g cm(-3) with tubes exhibiting extremely narrow inner spacing. An ohmic behavior is confirmed between the forest and Cu support with the lowest resistance of ∼8 kΩ. The forest shows a high thermal effusivity of 1840 J s(-0.5) m(-2) K(-1), and a thermal conductivity of 4.0 J s(-1) m(-1) K(-1), suggesting that these forests are useful for heat dissipation devices.

show abstract

Co-catalytic Absorption Layers for Controlled Laser-Induced Chemical Vapor Deposition of Carbon Nanotubes

Cited by 13 publications

References 47 publications

Growth, structure and stability of sputter-deposited MoS₂ thin films

Growth, structure and stability of sputter-deposited MoS₂ thin films

Interdependency of Subsurface Carbon Distribution and Graphene–Catalyst Interaction

Low-Temperature Growth of Carbon Nanotube Forests Consisting of Tubes with Narrow Inner Spacing Using Co/Al/Mo Catalyst on Conductive Supports

Contact Info

Product

Resources

About

Co-catalytic Absorption Layers for Controlled Laser-Induced Chemical Vapor Deposition of Carbon Nanotubes

Cited by 13 publications

References 47 publications

Growth, structure and stability of sputter-deposited MoS2 thin films

Growth, structure and stability of sputter-deposited MoS2 thin films

Interdependency of Subsurface Carbon Distribution and Graphene–Catalyst Interaction

Low-Temperature Growth of Carbon Nanotube Forests Consisting of Tubes with Narrow Inner Spacing Using Co/Al/Mo Catalyst on Conductive Supports

Contact Info

Product

Resources

About

Growth, structure and stability of sputter-deposited MoS₂ thin films

Growth, structure and stability of sputter-deposited MoS₂ thin films