Superhydrophobic and superhydrophilic surfaces with MoOx sub micron structures

Jos Campbell; Michael Breedon; W. Wlodarski; Kourosh Kalantar-zadeh

doi:10.1117/12.759867

27 December 2007 Superhydrophobic and superhydrophilic surfaces with MoO_x sub micron structures

Jos Campbell, Michael Breedon, W. Wlodarski, Kourosh Kalantar-zadeh

Proceedings Volume 6799, BioMEMS and Nanotechnology III; 67990F (2007) https://doi.org/10.1117/12.759867
Event: SPIE Microelectronics, MEMS, and Nanotechnology, 2007, Canberra, ACT, Australia

Abstract

Presented is an investigation of surface morphology of arrayed MoO_x structures with increasing aspect ratios, and their resultant superhydrophillic, and their modified superhydrophobic properties. Molybdenum oxide (MoO_x) submicron structures were grown on lithium niobate (LiNbO₃) substrates via the thermal evaporation of MoO₃ nanopowder at 750°C in a horizontal tube furnace. A mixture of 90% argon and 10% oxygen was introduced into the thermal evaporation tube at flow rate of 1L/min. This resulted in the formation of a white film which consisted of submicron tabular structures. Scanning electron micrographs revealed that the tabular molybdenum oxide grew in arrays 80-100° with respect to the plane of the substrate, with tabular structures with a thickness of approx 0.5 - 1.5μm. Initial testing of MoO_x structures revealed that they were extremely super hydrophilic. Such MoO_x arrays were coated with fluoropolymer Teflon, deposited using the RF sputtering technique. The addition of a semi-conformal Teflon layer effectively converts the superhydrophilic MoO_x layer into a superhydrophobic surface. These superhydrophobic surfaces exhibit contact angles with aqueous media in excess of 150°. Such surfaces can be utilized for the selective adsorption and desorption of protein or pharmacokinetic molecules, with applications in drug delivery and biomedical systems.

Citation Download Citation

Jos Campbell, Michael Breedon, W. Wlodarski, and Kourosh Kalantar-zadeh "Superhydrophobic and superhydrophilic surfaces with MoO_x sub micron structures", Proc. SPIE 6799, BioMEMS and Nanotechnology III, 67990F (27 December 2007); https://doi.org/10.1117/12.759867

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available