Label-free and real-time immunodetection of the avian influenza a hemagglutinin peptide using a silicon field-effect transistor fabricated by a nickel self-aligned silicide process

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Abstract

Electrical immunodetection of the avian influenza A (H5N1) hemagglutinin (HA) peptide, the IN peptide, with anti-HA antibody was demonstrated using a field-effect transistor (FET) with an n-type silicon (Si) channel and a nickel (Ni) self-aligned silicide source/drain that was fabricated by a conventional top-down process. The specific binding of the IN peptide with anti-HA antibody in phosphate buffered saline (PBS) occurs on the patterned SiO 2 surface through covalent linkage. Positive ions in the buffer create majority carriers in the n-type Si channel, leading to a rapid increase in current across that channel. However, specific binding of the negatively charged antigens on the SiO 2 surface overlaying the Si channel results in the reduction of electrons induced in the Si channel by the positive ions, causing a significant decrease in the channel current. The settling time for obtaining a stable signal change, driven by the negatively charged antigens bound to antibody, extrapolates to approximately 32 s. © 2012 The Japan Institute of Metals.

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Hong, H., Park, Y. K., Kim, J. Y., Song, K., & Choi, C. J. (2012). Label-free and real-time immunodetection of the avian influenza a hemagglutinin peptide using a silicon field-effect transistor fabricated by a nickel self-aligned silicide process. Materials Transactions, 53(9), 1633–1637. https://doi.org/10.2320/matertrans.M2012068

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