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- W2000360750 abstract "A low-energy hydrogen bombardment method, without using any chemical additives, has been designed for fine tuning both physical and chemical properties of molecular thin films through selectively cleaving C–H bonds and keeping other bonds intact. In the hydrogen bombardment process, carbon radicals are generated during collisions between C–H bonds and hydrogen molecules carrying ∼10 eV kinetic energy. These carbon radicals induce cross-linking of neighboring molecular chains. In this work, we focus on the effect of hydrogen bombardment on dotriacontane (C32H66) thin films as growing on native SiO2 surfaces. After the hydrogen bombardment, XPS results indirectly explain that cross-linking has occurred among C32H66 molecules, where the major chemical elements have been preserved even though the bombarded thin film is washed by organic solution such as hexane. AFM results show the height of the perpendicular phase in the thin film decreases due to the bombardment. Intriguingly, Young's modulus of the bombarded thin films can be increased up to ∼6.5 GPa, about five times of elasticity of the virgin films. The surface roughness of the thin films can be kept as smooth as the virgin film surface after thorough bombardment. Therefore, the hydrogen bombardment method shows a great potential in the modification of morphological, mechanical, and tribological properties of organic thin films for a broad range of applications, especially in an aggressive environment." @default.
- W2000360750 created "2016-06-24" @default.
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- W2000360750 date "2011-02-21" @default.
- W2000360750 modified "2023-09-26" @default.
- W2000360750 title "Study of a hydrogen-bombardment process for molecular cross-linking within thin films" @default.
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- W2000360750 doi "https://doi.org/10.1063/1.3554430" @default.
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