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pubmed-article:11509722pubmed:abstractTextBoron-doped silicon nanowires (SiNWs) were used to create highly sensitive, real-time electrically based sensors for biological and chemical species. Amine- and oxide-functionalized SiNWs exhibit pH-dependent conductance that was linear over a large dynamic range and could be understood in terms of the change in surface charge during protonation and deprotonation. Biotin-modified SiNWs were used to detect streptavidin down to at least a picomolar concentration range. In addition, antigen-functionalized SiNWs show reversible antibody binding and concentration-dependent detection in real time. Lastly, detection of the reversible binding of the metabolic indicator Ca2+ was demonstrated. The small size and capability of these semiconductor nanowires for sensitive, label-free, real-time detection of a wide range of chemical and biological species could be exploited in array-based screening and in vivo diagnostics.lld:pubmed
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pubmed-article:11509722pubmed:articleTitleNanowire nanosensors for highly sensitive and selective detection of biological and chemical species.lld:pubmed
pubmed-article:11509722pubmed:affiliationDepartment of Chemistry and Chemical Biology, Harvard University, Cambridge, MA 02138, USA.lld:pubmed
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