Graphene based nanosensor for aqueous phase detection of nitroaromatics
Avaz, Merve Senem and Bardhan Roy, Rupak and Mokkapati, V. R. S. S. and Bozkurt, Ayhan and Pandit, Santosh and Mijakovic, Ivan and Menceloğlu, Yusuf Z. (2017) Graphene based nanosensor for aqueous phase detection of nitroaromatics. RSC Advances, 7 (41). pp. 25519-25527. ISSN 2046-2069 (Print) 2046-2069 (Online)
Official URL: http://dx.doi.org/10.1039/c7ra03860g
A graphene-based nanosensor was fabricated to selectively detect nitrotriazolone (NTO) molecules with a molecularly imprinted film via simple electrical measurements. Molecularly imprinted polymer comprising chitosan was used as sensitive layer. Gold electrodes for electrical measurements were lithographically fabricated on Si/SiO2 substrate, followed by monolayer graphene transfer and polymeric film coating. Monolayer graphene and molecularly imprinted polymer were characterized by ATR-FTIR, UV-Vis, SEM and Raman spectroscopy. Transfer-length measurements (TLM) indicate that the sensor selectively and linearly responds against aqueous NTO solutions within a wide range of concentration of 0.01–0.1 mg mL−1 that covers the lowest toxic level of NTO determined by USEPA. This nanosensor with embedded electrodes is re-usable and suitable for field applications, offering real-time electrical measurements unlike current techniques where complex analytics are required.
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