Thermal stability of thiol and silane monolayers: A comparative study
Thermal stability of thiol and silane monolayers: A comparative study
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DOI：
10.1016/j.apsusc.2009.11.020
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发表时间：
2010-02-15
影响因子：
6.7
通讯作者：
Whitten, James E.
中科院分区：
文献类型：
--
作者：
Chandekar, Amol;Sengupta, Sandip K.;Whitten, James E.
自组装单层膜（SAMs）在高温下的稳定性具有重要的技术意义。利用x射线光电子能谱（XPS）研究了1-十八烷硫醇（ODT）、16-巯基十六烷酸（MHDA）和1H、1H、2H、2H-全氟十烷硫醇（PFDT）在金表面上的热稳定性，以及4-氨基丁基三乙氧基硅烷（ABTES）和1H、1H、2H、2H-全氟十二烷基三乙氧基硅烷（PFDS）在羟基化硅表面上的热稳定性。样品在超高真空中加热到超过SAM降解所需的温度。ODT单分子膜在110℃下稳定，而MHDA和PFDT单分子膜在145℃下稳定。ABTES单分子膜在250℃下稳定，而PFDS单分子膜在350℃下稳定。这些研究证明了硅烷单分子膜在中高温应用中的优势，并说明了由于尾基团的性质而产生的差异。为了证明硅烷用于模板定向图图化的可行性，在含有微接触印刷PFDS图案的羟基化氧化硅表面上涂覆了一种主要亲水嵌段共聚物。将表面在90℃下退火2小时，使嵌段共聚物使疏水性pfds图案区域脱水，并只吸附在表面的非图案区域上。(C) 2009 Elsevier b.v.版权所有
The stability of self-assembled monolayers (SAMs) at elevated temperatures is of considerable technological importance. The thermal stability of 1-octadecanethiol (ODT), 16-mercaptohexadecanoic acid (MHDA) and 1H, 1H, 2H, 2H-perfluorodecanethiol (PFDT) SAMs on gold surfaces, and of 4-aminobutyltriethoxysilane (ABTES) and 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane (PFDS) assembled on hydroxylated silicon surfaces, was studied by X-ray photoelectron spectroscopy (XPS). The samples were heated in ultrahigh vacuum to temperatures in excess of that required for SAM degradation. ODT monolayers were stable to ca. 110 degrees C, while MHDA and PFDT SAMs were stable to ca. 145 degrees C. ABTES SAMs were found to be indefinitely stable to 250 degrees C, while PFDS SAMs were stable to 350 degrees C. These studies demonstrate the advantages of using silane monolayers for moderate to high temperature applications and illustrate differences that arise due to the nature of the tail group. To demonstrate the feasibility of silanes for template-directed patterning, a hydroxylated silicon oxide surface containing microcontact-printed PFDS patterns was spin-coated with a mainly hydrophilic block copolymer. Annealing the surface at 90 degrees C for 2 h caused the block copolymer to dewet the hydrophobic PFDS-patterned regions and adsorb exclusively on the unpatterned regions of the surface. (C) 2009 Elsevier B. V. All rights reserved.