Surface Energy Engineering for Tunable Wettability through Controlled Synthesis of MoS2
Artikel i vetenskaplig tidskrift, 2014

MoS2 is an important member of the transition metal dichalcogenides that is emerging as a potential 2D atomically thin layered material for low power electronic and optoelectronic applications. However, for MoS2 a critical fundamental question of significant importance is how the surface energy and hence the wettability is altered at the nanoscale in particular, the role of crystallinity and orientation. This work reports on the synthesis of large area MoS2 thin films on insulating substrates (SiO2/Si and Al2O3) with different surface morphology via vapor phase deposition by varying the growth temperatures. The samples were examined using transmission electron microscopy and Raman spectroscopy. From contact angle measurements, it is possible to correlate the wettability with crystallinity at the nanoscale. The specific surface energy for few layers MoS2 is estimated to be about 46.5 mJ/m2. Moreover a layer thickness-dependent wettability study suggests that the lower the thickness is, the higher the contact angle will be. Our results shed light on the MoS2–water interaction that is important for the development of devices based on MoS2 coated surfaces for microfluidic applications.

Författare

A.P.S. Gaur

University of Puerto Rico

S. Sahoo

University of Puerto Rico

M. Ahmadi

University of Puerto Rico

Saroj Prasad Dash

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

M.J.F. Guinel

University of Puerto Rico

R.S. Katiyar

University of Puerto Rico

Nano Letters

1530-6984 (ISSN) 1530-6992 (eISSN)

Vol. 14 8 4314-4321

Styrkeområden

Nanovetenskap och nanoteknik

Ämneskategorier

Fysik

Nanoteknik

DOI

10.1021/nl501106v

Mer information

Skapat

2017-10-07