title: Development of a templated approach to fabricate diamond patterns on various substrates.
abstract: We demonstrate a robust templated approach to pattern thin films of chemical vapor deposited nanocrystalline diamond grown from monodispersed nanodiamond (mdND) seeds. The method works on a range of substrates, and we herein demonstrate the method using silicon, aluminum nitride (AlN), and sapphire substrates. Patterns are defined using photo- and e-beam lithography, which are seeded with mdND colloids and subsequently introduced into microwave assisted chemical vapor deposition reactor to grow patterned nanocrystalline diamond films. In this study, we investigate various factors that affect the selective seeding of different substrates to create high quality diamond thin films, including mdND surface termination, zeta potential, surface treatment, and plasma cleaning. Although the electrostatic interaction between mdND colloids and substrates is the main process driving adherence, we found that chemical reaction (esterification) or hydrogen bonding can potentially dominate the seeding process. Leveraging the knowledge on these different interactions, we optimize fabrication protocols to eliminate unwanted diamond nucleation outside the patterned areas. Furthermore, we have achieved the deposition of patterned diamond films and arrays over a range of feature sizes. This study contributes to a comprehensive understanding of the mdND-substrate interaction that will enable the fabrication of integrated nanocrystalline diamond thin films for microelectronics, sensors, and tissue culturing applications.
authors.affiliation: School of Physics, The University of Melbourne , Parkville, Victoria 3010, Australia.
authors.forename: Olga
authors.initials: O
authors.lastname: Shimoni
authors.forename: Jiri
authors.initials: J
authors.lastname: Cervenka
authors.forename: Timothy J
authors.initials: TJ
authors.lastname: Karle
authors.forename: Kate
authors.initials: K
authors.lastname: Fox
authors.forename: Brant C
authors.initials: BC
authors.lastname: Gibson
authors.forename: Snjezana
authors.initials: S
authors.lastname: Tomljenovic-Hanic
authors.forename: Andrew D
authors.initials: AD
authors.lastname: Greentree
authors.forename: Steven
authors.initials: S
authors.lastname: Prawer
mesh_terms: D018130:Diamond; D008855:Microscopy, Electron, Scanning; D008872:Microwaves; D056951:Photoelectron Spectroscopy; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D018130:Diamond