Water Adsorption on Hydrophilic and Hydrophobic Surfaces of Silicon

By Lei Chen, Xin He, Hongshen Liu, L. Qian, Seong H. Kim. 2018

183 citations recorded by the source corpus.

The isotherm thickness and hydrogen-bonding interactions of water layers adsorbed on hydrophilic and hydrophobic surfaces were quantified and compared. The hydrophilic and hydrophobic surfaces were modeled with an OH-terminated native oxide layer on silicon and a HF-etched silicon terminated with hydrogen, respectively. The silicon substrate allows the use of attenuated total reflection infrared (ATR-IR) spectroscopy for quantitative measurement of adsorbed water without interferences from the gas phase water. On the hydrophilic Si–OH surface, the average thickness of the strongly hydrogen-bonded water layer increases up to ∼2 molecular layers as relative humidity (RH) increases, beyond which the weakly hydrogen-bonded structure is dominant. On the hydrophobic Si–H surface, the adsorbed water layer consists predominantly of the weakly hydrogen-bonded structure and its average thickness remains less than a monolayer even at RH = 90%. The differences in the thickness and structure of adsorbed water layers o...

Subfields: Atmospheric Science, Atomic and Molecular Physics, and Optics, Biomedical Engineering

View Paper: https://www.semanticscholar.org/paper/35036a7f6e89fe0d5cca77c05f3753c65e18df14

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In Atomic and Molecular Physics, and Optics

1. Xin He
2. Chen Xiao
3. Seong-Young Kim
4. Zhe Chen

Citations in the corpus

• Effect of Humidity on Friction and Wear—A Critical Review (2018, background): “The former is hydrophobic (with a water contact angle of 83°) [144], while the latter is hydrophilic (with a water contact angle of 0°), especially when its surface is terminated with hydroxyl (OH) groups [145].”