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Multifunctional ToF-SIMS: Combinatorial Mapping of Gradient Energy Substrates
Published
Author(s)
S V. Roberson, Albert J. Fahey, A Sehgal, Alamgir Karim
Abstract
We present a simple method for chemical modification of chlorosilane self-assembled monolayers (SAMS) on Si surfaces by exposure to a gradient of UV-ozone radiation to create stable substrates with a range of contact angles (θ H2O {approximately equal to} 5{degrees C} - 95{degrees C}) and surface energies on a single substrate. These gradient energy substrates are developed to potentially generate libraries for combinatorial studies of thin film phenomenology. The graded oxidation process presents a systematic variation of surface chemical composition. We have utilized contact angle measurements and time-of-flight secondary ion mass spectrometry (TOF-SIMS) to investigate this variation for a series of ions, among which are SiCH3+, SiOH+ and COOH-. We show that the macroscopic measurements of surface free energy/contact angle correlate with the detailed analysis of surface chemistry (as assessed by TOF-SIMS) on these test substrates.
Citation
Applied Surface Science
Volume
200
Issue
No. 1-4
Pub Type
Journals
Keywords
surface energy gradient, ToF-SIMS, UV-ozone treatment
Citation
Roberson, S.
, Fahey, A.
, Sehgal, A.
and Karim, A.
(2002),
Multifunctional ToF-SIMS: Combinatorial Mapping of Gradient Energy Substrates, Applied Surface Science
(Accessed September 21, 2023)