Enhanced stability of organic field-effect transistor biosensors bearing electrosynthesized ZnO nanoparticles

A1 Journal article (refereed)

Internal Authors/Editors

Publication Details

List of Authors: Picca RA, Manoli K, Luciano A, Sportelli MC, Palazzo G, Torsi L, Cioffi N
Publication year: 2018
Journal: Sensors and Actuators B: Chemical
Journal acronym: SENSOR ACTUAT B-CHEM
Volume number: 274
Start page: 210
End page: 217
Number of pages: 8
ISSN: 0925-4005


Herein electrosynthesized ZnO nanoparticles (ZnO NPs) agents to largely improve functional bio-interlayer organic field-effect transistor (FBI-OFET) biosensors stability are investigated. For a proof-of-principle, streptavidin (SA) was chosen as the capturing biomolecule to sense biotin and poly-3-hexylthiophene (P3HT) served as channel material. The ZnO NPs were prepared and integrated into the FBI-OFET architecture by means of a straightforward and versatile procedure. To this end, ZnO NPs were mixed with an SA solution and the resulting aqueous suspension was readily spin-coated onto the SiO2 gate dielectric. The P3HT film was spin-coated on the SA-ZnO NPs layer afterwards with the whole fabrication procedure taking no more than 30 min. The FBI-OFET biosensors bearing the ZnO NPs exhibited a shelf life exceeding one year, while the bare ones failed to work after few weeks. Moreover, the ZnO NPs enabled a two orders of magnitude increase in field-effect mobility while the already proven very good sensing performances were retained. The electrical and XPS characterization of the ZnO NPs based functional bio-interlayer provided information about the role of the nanostructured oxide on the improved device stability and a plausible mechanism for this occurrence is derived accordingly.


Extended lifetime, Field-effect transistor sensors, Functional bio-interlayer, Poly-(3-hexylthiophene), Zinc oxide

Last updated on 2020-28-09 at 03:31