title: Large area growth of vertically aligned luminescent MoS2nanosheets.
abstract: Vertically aligned MoS2nanosheets (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 MoS2NSs 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 MoS2NSs. Additional characterization techniques such as atomic force microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, and photoluminescence (PL) were used to evaluate the MoS2NSs. These studies revealed the high crystallinity and quality of the synthesized NSs. The MoS2NSs show visible light emission similar to mechanically exfoliated monolayer MoS2NSs. The striking PL signal comes from the exposed edges as shown by experimental and theoretical calculations. The vertical MoS2NSs also exhibit a hydrophobic character with a contact angle of 114°. The as-grown MoS2NSs would be highly useful in the development of catalysis, nano-optoelectronics, gas-sensing and bio-sensing device applications.
authors.affiliation: Department of Physics and Research Group on Carbon Nanostructures (CARBONNAGe), University of Namur, 61 Rue de Bruxelles, 5000 Namur, Belgium. geetanjali.deokar@unamur.be mjouiad@masdar.ac.ae.
authors.forename: G
authors.initials: G
authors.lastname: Deokar
authors.forename: N S
authors.initials: NS
authors.lastname: Rajput
authors.forename: P
authors.initials: P
authors.lastname: Vancsó
authors.forename: F
authors.initials: F
authors.lastname: Ravaux
authors.forename: M
authors.initials: M
authors.lastname: Jouiad
authors.forename: D
authors.initials: D
authors.lastname: Vignaud
authors.forename: F
authors.initials: F
authors.lastname: Cecchet
authors.forename: J-F
authors.initials: JF
authors.lastname: Colomer