Highly sensitive and reusable ion-sensor based on functionalized graphene

Some sub-products from the industrial activity are rich in metals, very often being highly toxic to human health and to the environment. Thus, the development of real-time and ultrasensitive techniques for metals detection is relevant. Herein, we report an ion-sensitive field-effect transistor (ISFE...

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Bibliographic Details
Published in:Applied physics letters 2020-07, Vol.117 (3)
Main Authors: Alves, Ana Paula P., Meireles, Leonel M., Ferrari, Gustavo A., Cunha, Thiago Henrique R., Paraense, Mariana O., Campos, Leonardo C., Lacerda, Rodrigo G.
Format: Article
Language:English
Subjects:
Aluminum
Applied physics
Cobalt
Copper
Field effect transistors
Graphene
Low concentrations
Phenylalanine
Real time
Semiconductor devices
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Summary:Some sub-products from the industrial activity are rich in metals, very often being highly toxic to human health and to the environment. Thus, the development of real-time and ultrasensitive techniques for metals detection is relevant. Herein, we report an ion-sensitive field-effect transistor (ISFET) based on l-phenylalanine functionalized graphene that detects Na+, Co2+, and Al3+ at the nanomolar range and Cu2+ at the picomolar range. Our sensor is prepared using a simple functionalization method and is reusable after a standard HCl cleaning process. Altogether, the ISFET is a promising device for real-time detection of metal ions at low concentrations.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0009555