Carbon nanotubes field effect transistors biosensors
2012
Carbon nanotube transistor arrays (CNTFETs) were
used as biosensors to detect DNA hybridization and
to recognize two anabolic steroids, stanozolol (Stz)
and methylboldenone (MB). Single strand DNA and
antibodies specific for STz and MB were immobilized
on the carbon nanotubes (CNTs) in situ in the device
using two different approaches: direct noncovalent
bonding of antibodies to the devices and covalently
trough a polymer previously attached to the
CNTFETs. A new approach to ensure specific
adsorption of the biomolecules to the nanotubes
was developed. The polymer poly
(methylmethacrylate0.8-co-poly (ethyleneglycol)
methacrylate0.8-co-N-succinimidyl methacrylate0.1)
was synthesized and bonded noncovalently to the
nanotube. Aminated single-strand DNA or antibodies
specific for Stz and MB were then attached covalently
to the polymer. Statistically significant changes were
observed in key transistor parameters for both DNA
hybridization and steroids recognition. Regarding
the detection mechanism, in addition to charge
transfer, Schottky barrier, SB, modification, and
scattering potential reported by other authors, an
electron/hole trapping mechanism leading to
hysteresis modification has been determined. The
presence of polymer seems to hinder the modulation
of the electrode-CNT contact.
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