Nanowire nanosensors for highly sensitive and selective detection of biological and chemical species.
摘要：
Boron-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.
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关键词：
Protons Calcium Boron Silicon Biotin Proteins Streptavidin Calmodulin Antibodies, Monoclonal Ligands
DOI：
10.1126/science.1062711
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年份：
2001
Taylor & Francis
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万方医学
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