Light-Induced Surface Patterning of Silica

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Manipulating the size and shape of silica precursor patterns using simple far-field light irradiation and transforming such reconfigured structures into inorganic silica patterns by pyrolytic conversion are demonstrated. The key concept of our work is the use of an azobenzene incorporated silica precursor (herein, we refer to this material as azo-silane composite) as ink in a micromolding process. The moving direction of azo-silane composite is parallel to light polarization direction; in addition, the amount of azo-silane composite movement can be precisely determined by controlling light irradiation time. By exploiting this peculiar phenomenon, azo-silane composite patterns produced using the micromolding technique are arbitrarily manipulated to obtain various structural features including high-resolution size or sophisticated shape. The photoreconfigured patterns formed with azo-silane composites are then converted into pure silica patterns through pyrolytic conversion. The pyrolytic converted silica patterns are uniformly formed over a large area, ensuring crack-free formation and providing high structural fidelity. Therefore, this optical manipulation technique, in conjunction with the pyrolytic conversion process, opens a promising route to the design of silica patterns with finely tuned structural features in terms of size and shape. This platform for designing silica structures has significant value in various nanotechnology fields including micro/nanofluidic channel for lab-on-a-chip devices, transparent superhydrophobic surfaces, and optoelectronic devices.
Publisher
AMER CHEMICAL SOC
Issue Date
2015-10
Language
English
Article Type
Article
Keywords

DIRECTIONAL PHOTOFLUIDIZATION LITHOGRAPHY; BLOCK-COPOLYMER LITHOGRAPHY; RELIEF-GRATING FORMATION; POLYMER-FILMS; NANOIMPRINT LITHOGRAPHY; AZOBENZENE MATERIALS; SOFT LITHOGRAPHY; ARRAYS; MICROSTRUCTURES; SUPERHYDROPHOBICITY

Citation

ACS NANO, v.9, no.10, pp.9837 - 9848

ISSN
1936-0851
DOI
10.1021/acsnano.5b03946
URI
http://hdl.handle.net/10203/205253
Appears in Collection
CBE-Journal Papers(저널논문)
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