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Detection of binary amino acid in aqueous solution using double gate graphene nano-ribbon field effect transistor
摘要： The study proposes an amperometric biosensor which provides a new approach to the detection of binary amino acid using Graphene Nanoribbon Field Effect Transistor. The high dielectric properties of the binary amino acids groups (L-proline, glycine, L-alanine, and L-serine) in aqueous solution pave the way for precise detection of these molecules using the proposed nano biosensor. High dielectrics as gate insulation materials result in a change of one-dimensional electron density of the device. As a result, the presence of the amino acid groups can be realized through the change in the subthreshold swing of the nanobiosensor. The implementation of this method in Graphene nanobiosensor can be further extended in cases of other non-polar, non-charged biomolecules and acids.
关键词： Dielectric modulation,Field effect transistor,Graphene nanoribbon,Biosensor,Binary amino acid
更新于2025-09-04 15:30:14
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PH SENSITIVITY DEPENDENCY ON THE ANNEALING TEMPERATURE OF SPIN-COATED TITANIUM DIOXIDE THIN FILMS
摘要： Titanium dioxide (TiO2) thin films were fabricated on indium tin oxide (ITO) glass substrates using the spin coating technique and further were implemented as sensing membranes of the extended gate field effect transistor (EGFET) based pH sensor. The as-deposited thin films were annealed at different temperatures from 200 - 600 °C in room ambient for 20 min. The effects of different annealing temperatures on electrical and crystalline properties were analyzed by I-V two point probes measurement and X-ray diffraction respectively. Meanwhile, the surface morphology of thin films was observed by field emission scanning electron microscope (FESEM). We then measured the transfer characteristics (ID-VG) of the TiO2/ITO sensing membrane using a semiconductor parametric device analyzer for sensor characterization. It was found that, TiO2/ITO sensing membrane annealed at 300 °C achieved higher sensitivity and good linearity of 51.48 mV/pH and 0.99415, respectively in the pH buffer solutions of 4, 7, 10, and 12. Thin film annealed at 300 °C gives higher conductivity thin film of 384.62 S/m. We found that the conductivity of TiO2/ITO thin films was proportional with the sensitivity of sensing membrane.
关键词： titanium dioxide,Annealing temperature,sol-gel spin coating,extended gate field effect transistor
更新于2025-09-04 15:30:14