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A bottom contact organic thin-film transistor (OTFT) using a-sexithiophene (α-6T) as an active layer was fabricated in this paper. α-6T was deposited via vacuum evaporation onto a SiO2/n-Si substrate and was characterized by scanning electron microscope (SEM). The current-voltage characteristics of the α-6T OTFT and its response to different concentrations of methanol, alcohol and secondary butyl...
A CMOS delta-sigma (ΣΔ) pH-to-digital converter has been developed for continuous monitoring of H+-ion concentrations. The SnO2/ITO glass, fabricated sputtering SnO2 on the conductive ITO glass, was used as a pH-sensitive membrane of extended gate field effect transistor (EGFET) operational amplifier. The ΣΔ pH-to-digital converter, constructed by using EGFET-OP to realize switched-capacitor (SC)...
In this paper, solvent-functionalized CNTs are coated on mass-sensitive quartz crystal microbalance (QCM) devices to study their gas-sensing properties for volatile organic compounds (VOCs) at room temperature. The results indicate that different solvent-functionalized CNTs under the same conditions have the dissimilar response and similar VOCs to the polarity of the solvent show better gas-sensing...
A modified spin coating method used for fabricating the waveguide layer has been evaluated for Love wave device. The properties of these devices have been compared with those of devices fabricated by the conventional method. The thicker and smooth layers achieved by the modified method enhance the mass sensitivity and reduce the insertion loss. Poly (vinylidene fluoride) (PVDF) and sulfosalicylic...
This work investigates a disposable creatinine potentiometric biosensor based on a pH-sensitive electrode and an ammonium ion-selective electrode. An enzyme, creatinine iminohydrolase (CIH) was immobilized directly onto the surface of the electrodes by the entrapment method. According to the experimental results, the creatinine biosensors based on the pH-sensitive electrode and ammonium ion-selective...
In this paper, screen-printed carbon electrode and glass indium tin oxide electrode were used, and the membrane for the use of our research was prepared by the sol-gel method with each sensitivity under the linear measuring range was 53 mV/pH and 48 mV/pH. Nevertheless, by using the principle of EGFET we build up the enzyme sensitive field effect transistor (ENFET) which the biomedical uricase membrane...
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