A reference-less pH sensor based on an organic field effect transistor with tunable sensitivity
| Autor: | Annalisa Bonfiglio, Piero Cosseddu, Pier Carlo Ricci, Fabrizio Antonio Viola, Andrea Spanu, Stefano Lai |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Silicon chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Reference electrode Organic Charge Modulated FET law.invention Biomaterials symbols.namesake law Materials Chemistry Nernst equation Electrical and Electronic Engineering Organic field-effect transistor business.industry Transistor General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Electronic Optical and Magnetic Materials Organic semiconductor High-sensitivity sensors chemistry pH sensors symbols Optoelectronics 0210 nano-technology business Sensitivity (electronics) Realization (systems) |
| Zdroj: | Organic electronics 48 (2017): 188–193. doi:10.1016/j.orgel.2017.06.010 info:cnr-pdr/source/autori:Spanu A.; Viola F.; Lai S.; Cosseddu P.; Ricci P.C.; Bonfiglio A./titolo:A reference-less pH sensor based on an organic field effect transistor with tunable sensitivity/doi:10.1016%2Fj.orgel.2017.06.010/rivista:Organic electronics (Print)/anno:2017/pagina_da:188/pagina_a:193/intervallo_pagine:188–193/volume:48 |
| ISSN: | 1566-1199 |
| Popis: | Despite their great potentiality, ISFET-like devices generally suffer from an intrinsic limitation in sensitivity, the so-called Nernst limit. Moreover, the high costs, the restricted range of employable materials associated to the silicon technology, and the need for a reference electrode, have reduced the applicability of such devices in the bio-sensing field. In this work, we show how a reference-less pH sensor based on an organic semiconductor device, called Organic Charge-Modulated Field-Effect Transistor (OCMFET), besides being low cost, flexible, and transparent, shows a super-nernstian sensitivity with no need of any chemical modification of the sensing area. Moreover, thanks to its peculiar transduction principle and structure, the device sensitivity can be easily tuned by acting on geometry-related parameters of the device itself, introducing an interesting alternative approach for the realization of highly sensitive, reference-less, and low-cost devices for a wide range of bio-sensing applications. |
| Databáze: | OpenAIRE |
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