Vapor-Phase Plotting of Organosilane Chemical Gradients

被引:5
|
作者
Bautista-Gomez, Judith [1 ]
Forzano, Anna, V [2 ]
Austin, Joshua M. [1 ]
Collinson, Maryanne M. [2 ]
Higgins, Daniel A. [1 ]
机构
[1] Kansas State Univ, Dept Chem, Manhattan, KS 66506 USA
[2] Virginia Commonwealth Univ, Dept Chem, Box 2006, Richmond, VA 23284 USA
基金
美国国家科学基金会;
关键词
SURFACES; REACTIVITY; GOLD;
D O I
10.1021/acs.langmuir.8b01977
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Vapor-phase plotting of organosilane-based self-assembled monolayer (SAM) gradients is demonstrated for the first time. Patterned SAMs are formed by delivering gas-phase organotrichlorosilane precursors to a reactive silica surface using a heated glass capillary. The capillary is attached via a short flexible tube to a reservoir containing the precursor dissolved in toluene. The proximal end of the capillary is positioned at an experimentally optimized distance of 30 mu m above the substrate during film deposition. The capillary is mounted to a stepper-motor-driven X,Y plotter for raster scanning above the surface. Two different organotrichlorosilane precursors are employed in this initial demonstration: n-octyltrichlorosilane and 3-cyanopropyltrichlorosilane. The dependence of SAM deposition on ambient relative humidity, capillary substrate separation, raster-scanning speed, and solvent viscosity and volatility is explored and optimum deposition conditions are identified. The optimized procedures are used to plot uniformly modified square "pads" and gradients of the silanes. Film formation is verified and the gradient profiles are obtained by sessile drop water contact angle measurements, spectroscopic ellipsometry measurements of film thickness, and X-ray photoelectron spectroscopy mapping. The resolution of the plotting process is currently in the millimeter range and depends on capillary diameter and distance from the substrate surface. Vapor phase plotting affords a unique direct-write method for producing patterned and chemically graded SAMS that may find applications in microfluidic devices, planar chromatography, and optical and electronic devices.
引用
收藏
页码:9665 / 9672
页数:8
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