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A Hierarchically Ordered TiO 2 Hemispherical Particle Array with Hexagonal‐Non‐Close‐Packed Tops: Synthesis and Stable Superhydrophilicity Without UV Irradiation
Author(s) -
Li Yue,
Sasaki Takeshi,
Shimizu Yoshiki,
Koshizaki Naoto
Publication year - 2008
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.200800428
Subject(s) - superhydrophilicity , materials science , particle (ecology) , irradiation , nanotechnology , monolayer , nanoparticle , chemical engineering , polystyrene , lithography , contact angle , particle size , optoelectronics , composite material , polymer , geology , oceanography , physics , nuclear physics , engineering
A hierarchical TiO 2 ordered hemispherical particle array with hexagonal‐non‐close‐packed (hncp) tops is prepared by pulsed laser deposition (PLD) using a polystyrene colloidal monolayer as a template. Compared with conventional lithography, the route presented has the advantage of low cost for producing hncp nanostructured arrays. This hierarchical particle array exhibits excellent superhydrophilicity with a water contact angle of 0° without further UV irradiation. The superhydrophilic property originates from oxygen defects or vacancies on the surface of the TiO 2 nanoparticles produced by PLD and the increased roughness of the hierarchical particle arrays. More importantly, this property is very stable for half a year and could be used in self‐cleaning surfaces and microfluidic devices.