Origins of charge noise in carbon nanotube field-effect transistor biosensors.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 23171196.
- Also identified by DOI 10.1021/nl303651t.
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Abstract
Determining the major noise sources in nanoscale field-effect transistor (nanoFET) biosensors is critical for improving bioelectronic interfaces. We use the carbon nanotube (CNT) FET biosensor platform to examine the noise generated by substrate interactions and surface adsorbates, both of which are present in current nanoFET biosensors. The charge noise model is used as a quantitative framework to show that insulating substrates and surface adsorbates are both significant contributors to the noise floor of CNT FET biosensors. Removing substrate interactions and surface adsorbates reduces the power spectral density of background voltage fluctuations by 19-fold.
Medical subject headings
- Biosensing Techniques
- Nanotubes, Carbon