Nanometric multi-scale rough CuO/Cu(OH)2 superhydrophobic surfaces prepared by facile one step solution-immersion process: Transition to superhydrophilicity with oxygen plasma treatment

Archana, Chaudhary and Barshilia, Harish C (2011) Nanometric multi-scale rough CuO/Cu(OH)2 superhydrophobic surfaces prepared by facile one step solution-immersion process: Transition to superhydrophilicity with oxygen plasma treatment. Journal of Physical Chemistry C, 115 (37). pp. 18213-18220.

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Abstract

An inexpensive and facile one step method to develop the superhydrophobic coating on copper surface is reported. Superhydrophobic CuO/Cu(OH)2 surfaces Prepared by a simple solution-immersion process at room temperature, without using a low surface energy material. The structure and composition of as-prepared CuO/Cu(OH)2 hierarchical structure was confirmed by X-ray diffraction (XRD), micro-Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). The growth stage was carefully examined by using field emission scanning electron microscopy (FESEM) and it was observed that Cu(OH)2 nanoneedle arrays were formed in the beginning on the copper surface, after that CuO micro-flowers were formed on the nanoneedle arrays. The contact angle as a function of immersion time was studied using contact angle goniometer. The correlation between the microstructure of the immersed copper surface and the contact angle was examined carefully using FESEM and atomic force microscopy (AFM). Our studies based on FESEM and AFM show that the CuO/Cu(OH)2 coatings demonstrate superhydrophobicity only for an optimal combination of solid region (i.e., microflowers and nanoneedle) and air pockets (i.e., voids). The maximum static water contact angle on the prepared surface was 159. The wettability transition of the CuO/Cu(OH)2 surface from superhydrophobicity to superhydrophilicity was studied by the alteration of oxygen plasma treatment and dark storage. FESEM, AFM and XPS studies show that this transformation was mainly due to the morphological changes that occur in addition to the chemical changes taking place on the CuO/Cu(OH)2 surface under the influence of oxygen plasma. XPS analysis demonstrates that the incorporation of oxygen species by oxygen plasma activation accounted for the highly hydrophilic character of the surface.

Item Type: Journal Article
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Division/Department: Other, Surface Engineering Division
Depositing User: Dr. Harish C. Barshilia
Date Deposited: 23 Nov 2011 14:49
Last Modified: 23 Nov 2011 14:49
URI: http://nal-ir.nal.res.in/id/eprint/10037

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