am0c00293_si_001.pdf (1.13 MB)
Systematic Investigation of Molecular Recognition Ability in FET-Based Chemical Sensors Functionalized with a Mixed Self-Assembled Monolayer System
journal contribution
posted on 2020-03-17, 16:34 authored by Tsukuru Minamiki, Yuki Ichikawa, Ryoji KuritaExploring
new strategies for simple and on-demand methods of manipulating
the sensing ability of sensor devices functionalized with artificial
receptors embedded in a molecular assembly is important to realizing
high-throughput on-site sensing systems based on integrated and miniaturized
devices such as field-effect transistors (FETs). Although FET-based
chemical sensors can be used for rapid, quantitative, and simultaneous
determination of various desired analytes, detectable targets in conventional
FET sensors are currently restricted owing to the complicated processes
used to prepare sensing materials. In this study, we investigated
the relationship between the sensing features of FETs and the nanostructures
of mixed self-assembled monolayers (mSAMs) for the detection of biomolecules.
The FET devices were systematically functionalized using mixtures
of benzenethiol derivatives (4-mercaptobenzoic acid and benzenethiol),
which changed the nanostructure of the SAMs formed on gold sensing
electrodes. The obtained cross-reactivity in the FETs modified with
the mSAMs was derived from the multidimensional variations of the
SAM characteristics. Our successful demonstration of continuous control
of the molecular recognition ability in the FETs by applying the mSAM
system could lead to the development of next-generation versatile
analyzers, including chemical sensor arrays for the determination
of multiple analytes anytime, anywhere.
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Keywords
on-demand methodschemical sensor arraysself-assembled monolayersSAM characteristicsfield-effect transistorsSystematic InvestigationFET-Based Chemical Sensors FunctionalizedMolecular Recognition Abilityrecognition abilitymSAM systemFET devicesFET-based chemical sensorsFET sensorsMixed Self-Assembled Monolayer System Exploringsensor devices functionalized
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