Crystalline nanocolumns of copper oxide has been fabricated through oblique angle sputter deposition technique. The columns are exposed to 15 keV Ar+ ion beam at a fluence of 2 x 10(16) ions/cm(2). Well-separated nanocolumns are welded upon ion irradiation. The tips of the nanocolumns show prominent joining. Furthermore, wetting property measurements are done for both pristine and irradiated sample, which reveals that a transition occurs from hydrophilic to hydrophobic surface upon ion irradiation.
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