Arrays of CMOS nanocapacitors, which can operate at high frequencies, can be used to sense beyond the Debye screening length.
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Ingebrandt, S. Sensing beyond the limit. Nature Nanotech 10, 734–735 (2015). https://doi.org/10.1038/nnano.2015.199
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DOI: https://doi.org/10.1038/nnano.2015.199
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