Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 122, Issue 6, Pages 1205-1209Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja9936161
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Hydrogen-terminated Si(111) surfaces are modified by attachment of oligodeoxynucleotides and characterized with respect to DNA surface density, chemical stability, and DNA hybridization binding specificity. Surface functionalization employs the reaction of omega-unsaturated alkyl esters with the Si(111) surface using UV irradiation. Cleavage of the ester using potassium tert-butoxide yields a carboxyl-modified surface, which serves as a substrate for the attachment of DNA by means of an electrostatically adsorbed layer of polylysine and attachment of thiol-modified DNA using a heterobifunctional cross-linker. The resultant DNA-modified surfaces are shown to exhibit excellent specificity and chemical stability under the conditions of DNA hybridization. This work provides an avenue for the development of devices in which the exquisite binding specificity of biomolecular recognition is directly coupled to semiconductor devices.
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