Chin. Phys. Lett.  2020, Vol. 37 Issue (4): 046801    DOI: 10.1088/0256-307X/37/4/046801
Wettability and Surface Energy of Hydrogen- and Oxygen-Terminated Diamond Films
Zi-Cheng Ma, Nan Gao, Shao-Heng Cheng, Jun-Song Liu, Ming-Chao Yang, Peng Wang, Zhi-Yuan Feng, Qi-Liang Wang**, Hong-Dong Li**
State Key Lab of Superhard Materials, College of Physics, Jilin University, Changchun 130012
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Zi-Cheng Ma, Nan Gao, Shao-Heng Cheng et al  2020 Chin. Phys. Lett. 37 046801
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Abstract The contact angle and surface energy values of diamond are systemically investigated in terms of surface treatments (hydrogen- and oxygen-terminations), structure feature (single crystal diamonds and polycrystalline diamond films), crystal orientation ((100), (111) and mixed (100)/(111) orientations), different fluids (probes of polar deionized water and nonpolar di-iodomethane). It is found that the hydrophobic/hydrophilic characteristic and surface energy values of diamond are mainly determined by the surface hydrogen/oxygen termination, and less related to the structural features and crystal orientation. Based on the contact angle values with polar water and nonpolar di-iodomethane, the surface energies of diamond are estimated to be about 43 mJ/m$^{2}$ for hydrogen-termination and about 60 mJ/m$^{2}$ for oxygen-termination. Furthermore, the varying surface roughness of diamond and fluids with different polarities examined determine the variation of contact angles as well as the surface energy values. These results would be helpful for a more detailed understanding of the surface properties of diamond films for further applications in a broad number of fields, such as optical and microwave windows, biosensors, and optoelectronic devices, etc.
Received: 04 December 2019      Published: 24 March 2020
PACS:  68.08.Bc (Wetting)  
  68.35.Md (Surface thermodynamics, surface energies)  
  68.55.-a (Thin film structure and morphology)  
Fund: Supported by the National Natural Science Foundation of China under Grant Nos. 51672102 and 51972135.
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Articles by authors
Zi-Cheng Ma
Nan Gao
Shao-Heng Cheng
Jun-Song Liu
Ming-Chao Yang
Peng Wang
Zhi-Yuan Feng
Qi-Liang Wang
Hong-Dong Li
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