Modulating ZnO nanostructure arrays on any substrates by nanolevel structure control

Byeong Uk Ye, Hak Ki Yu, Myung Hwa Kim, Jong Lam Lee, Jeong Min Baik

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4 Scopus citations


A uniform high-aspect-ratio nanotextured surface with a very dense forest of vertically aligned nanowires that was produced by surface chemical postfabrication of ZnO was induced by a structural transformation at the nanolevel. X-ray photoelectron spectroscopy verified the formation of the heterogeneous surface structures (GaOx on GaN and AuOx on Au) at the nanolevel as well as the modification of surface stoichiometry by UV/ozone treatment. The structural transformation contributes to generating a surface charge, acting as nucleation sites for nanotip growth. This led to a significant increase in density and improvement in diameter of the nanotips for various substrates, such as ZnO, Au, GaN, and graphene. However, the surface oxygen by O2 plasma treatment reduced the activity as activation sites of the exposed surface, resulting in the decrease of the density of the nanotips. This rational engineering of substrates by a structural transformation at the nanolevel may provide a promising method for producing highly dense one-dimensional nanomaterials.

Original languageEnglish
Pages (from-to)7987-7992
Number of pages6
JournalJournal of Physical Chemistry C
Issue number16
StatePublished - 28 Apr 2011


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