Large area growth of vertically aligned luminescent MoS2 nanosheets

G. Deokar, N. S. Rajput, P. Vancsó, F. Ravaux, M. Jouiad, D. Vignaud, F. Cecchet, Jean-François Colomer

Résultats de recherche: Contribution à un journal/une revueArticle

Résumé

Vertically aligned MoS2 nanosheets (NSs) with exposed edges were successfully synthesized over a large area (∼2 cm2). The NSs were grown using an ambient pressure chemical vapor deposition technique via rapid sulfurization of sputter deposited thick molybdenum films. Extensive characterization of the grown MoS2 NSs has been carried out using high resolution scanning and transmission electron microscopy (SEM & TEM). A special care was given to the TEM lamella preparation process by means of a focused ion beam to preserve the NS growth direction. The cross-section TEM measurements revealed the growth of densely packed, vertically aligned and straight MoS2 NSs. Additional characterization techniques such as atomic force microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, and photoluminescence (PL) were used to evaluate the MoS2 NSs. These studies revealed the high crystallinity and quality of the synthesized NSs. The MoS2 NSs show visible light emission similar to mechanically exfoliated monolayer MoS2 NSs. The striking PL signal comes from the exposed edges as shown by experimental and theoretical calculations. The vertical MoS2 NSs also exhibit a hydrophobic character with a contact angle of 114°. The as-grown MoS2 NSs would be highly useful in the development of catalysis, nano-optoelectronics, gas-sensing and bio-sensing device applications.

langueAnglais
Pages277-287
Nombre de pages11
journalNanoscale
Volume9
Numéro1
Les DOIs
étatPublié - 7 janv. 2017

Empreinte digitale

Nanosheets
Transmission electron microscopy
Photoluminescence
Scanning electron microscopy
Molybdenum
High resolution electron microscopy
Focused ion beams
Light emission
Optoelectronic devices
Catalysis
Contact angle
Raman spectroscopy
Chemical vapor deposition
Monolayers
Atomic force microscopy
X ray photoelectron spectroscopy
Gases

Citer ceci

Deokar, G. ; Rajput, N. S. ; Vancsó, P. ; Ravaux, F. ; Jouiad, M. ; Vignaud, D. ; Cecchet, F. ; Colomer, Jean-François. / Large area growth of vertically aligned luminescent MoS2 nanosheets. Dans: Nanoscale. 2017 ; Vol 9, Numéro 1. p. 277-287.
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Large area growth of vertically aligned luminescent MoS2 nanosheets. / Deokar, G.; Rajput, N. S.; Vancsó, P.; Ravaux, F.; Jouiad, M.; Vignaud, D.; Cecchet, F.; Colomer, Jean-François.

Dans: Nanoscale, Vol 9, Numéro 1, 07.01.2017, p. 277-287.

Résultats de recherche: Contribution à un journal/une revueArticle

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