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There are presently many examples of 1-,2-,and 3-dimensional objects constructed using so-called self-assembly reactions. For example, covalent bonds formed between alkanethiols and gold substrates have been used to pattern surfaces; or hydrogen bonding interactions between DNA base pairs have been used to assemble nanoparticles into complex assemblies. Recently, however, researchers at the University of California, San Diego, have developed a novel technique that allows for the production of optical films with spatially resolved, chemically distinct layers. Although there is literature precedent for a range of surface modifications on porous silicon, the method can dually functionalize the sensors that imparts to them their ability to self-assemble and orient selectively at an interface. The main requirement of the chemical modification reaction used in the functionalization steps is that they be stable to the hydrofluoric etchant used in generating subsequent porous silicon layers. It is anticipated that a number of chemical and electrochemical modification strategies developed for porous silicon can be used with this procedure.
References: Summary of Professor Michael Sailor's porous silicon-based technology platform; June 2005.
"Smart Dust" presentation 2005
This technology is presently available for licensing.
Case Numbers: SD2003-257
LabLink: http://chem-faculty.ucsd.edu/sailor/research/
Inquiries To: invent@ucsd.edu
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