Abstract

We describe a new method for the fabrication of surface-chemical gradients. A film of titanium dioxide is brought into close proximity to a uniformly monolayer-covered surface and exposed to UV light to produce oxygen radicals. The use of a gradated grayscale mask between the UV source and the TiO2 allows the production of surface-chemical gradients via oxidation of the monolayer. The technique is demonstrated on gold surfaces bearing alkanethiol SAMs. Oxidation and subsequent replacement of the oxidized thiols has been used to produce surface-chemical gradients with lengths on the submillimeter to centimeter scales. The oxidation, removal, and replacement of the thiols during the process have been demonstrated by means of XPS. This oxidative process may be applied to other surface chemistries. Similarly, other shapes and slopes of gradients may be produced, depending on the photomask employed.

Keywords

X-ray photoelectron spectroscopyMonolayerPhotomaskFabricationTitanium dioxideLithographyChemical engineeringTitaniumMaterials scienceChemistryOxygenNanotechnologyPhotochemistryLayer (electronics)OptoelectronicsResistComposite materialOrganic chemistry

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Publication Info

Year
2007
Type
article
Volume
23
Issue
7
Pages
3489-3494
Citations
56
Access
Closed

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Cite This

Nicolas Blondiaux, Stefan Zürcher, Martha Liley et al. (2007). Fabrication of Multiscale Surface-Chemical Gradients by Means of Photocatalytic Lithography. Langmuir , 23 (7) , 3489-3494. https://doi.org/10.1021/la063186+

Identifiers

DOI
10.1021/la063186+
PMID
17323987

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Data completeness: 77%