Polymers in sensor applications

Conducting polymers in chemical sensors and arrays

Organic thin-film transistors (OTFTs) show promising applications in various chemical and biological sensors. The advantages of OTFT-based sensors include high sensitivity, low cost, easy fabrication, flexibility and biocompatibility. In this paper, we review the chemical sensors and biosensors based on two types of OTFTs, including organic field-effect transistors (OFETs) and organic electrochemical transistors (OECTs), mainly focusing on the papers published in the past 10 years. Various types of OTFT-based sensors, including pH, ion, glucose, DNA, enzyme, antibody-antigen, cell-based sensors, dopamine sensor, etc., are classified and described in the paper in sequence. The sensing mechanisms and the detection limits of the devices are described in details. It is expected that OTFTs may have more important applications in chemical and biological sensing with the development of organic electronics.

Organic Thin‐Film Transistors for Chemical and Biological Sensing

The application of organic thin-film transistors (OTFTs) to chemical and biological sensing is reviewed. This review covers transistors that are based on the modulation of current through thin organic semiconducting films, and includes both field-effect and electrochemical transistors. The advantages of using OTFTs as sensors (including high sensitivity and selectivity) are described, and results are presented for sensing analytes in both gaseous and aqueous environments. The primary emphasis is on the major developments in the field of OTFT sensing over the last 5-10 years, but some earlier work is discussed briefly to provide a foundation.

Chemical and biological sensors based on organic thin-film transistors.

Recent advances in polyaniline based biosensors

A biosensor based on conducting polymers

In this study, we have reported on solution-processed vertically aligned ZnO quantum dots (QDs) assisted nanorod array (NRA) based Schottky Photodetectors. The photodetector is fabricated followed by substrate cleaning, thin film, deposition, and hydrothermal synthesis respectively. The performance characteristics of the fabricated device were performed under different pulse widths of UV LED illumination wavelength 365-390 nm. The photodetector has exhibited a very quick response and a varying recovery time under the different UV pulse widths. Here, it is observed that the photocurrent of the photodetector is increased (3.7 µA to 69.4 µA) as a result of increasing the single UV LED pulse width from 1 sec to 5 min.

T. N. Suresh. Kumar

Papers

A biosensor based on conducting polymers

Time-Dependent Study of Solution-Processed Low-Cost ZnO QDs and NRA-based UV Photodetector