SciTech Connect

Title: The impact of solution agglomeration on the deposition of self-assembled monolayers

The impact of solution agglomeration on the deposition of self-assembled monolayers Self-assembled monolayers (SAMS) are commonly produced by immersing substrates in organic solutions containing trichlorosilane coupling agents. Unfortunately, such deposition solutions can also form alternate structures including inverse micelles and lamellar phases. The formation of alternate phases is one reason for the sensitivity of SAM depositions to factors such as the water content of the deposition solvent. If such phases are present, the performance of thin films used for applications such as minimization of friction and stiction in micromachines can be seriously compromised. Inverse micelle formation has been studied in detail for depositions involve 1H-, 1H-, 2H-, 2H-perfluorodecyltrichlorosilane (FDTS) in isooctane. Nuclear magnetic resonance experiments have been used to monitor the kinetics of hydrolysis and condensation reactions between water and FDTS. Light scattering experiments show that when hydrolyzed FDTS concentrations reach a critical concentration, there is a burst of nucleation to form high concentrations of spherical agglomerates. Atomic force microscopy results show that the agglomerates then deposit on substrate surfaces. Deposition conditions leading to monolayer formation involve using deposition times that are short relative to the induction time for agglomeration. After deposition, inverse micelles can be converted into lamellar or monolayer structures with appropriate heat treatments if surface concentrations are relatively more » low. « less
Authors: ; ; ; ; ; ; ; ;
Publication Date:
OSTI Identifier:754316
Report Number(s):SAND2000-0936J; 0000035111-000
0000035111-000; TRN: AH200016%%210
DOE Contract Number:AC04-94AL85000
Resource Type:Journal Article
Data Type:
Resource Relation:Journal Name: Langmuir; Other Information: Submitted to Langmuir; PBD: 17 Apr 2000
Research Org:Sandia National Labs., Albuquerque, NM (US)
Sponsoring Org:US Department of Energy (US)
Country of Publication:United States
Language:English
Subject: 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; SYNTHESIS; AQUEOUS SOLUTIONS; THIN FILMS; SILANES; HYDROLYSIS; AGGLOMERATION; MICELLAR SYSTEMS; LAMELLAE