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Materials 2018, 11(9), 1674; https://doi.org/10.3390/ma11091674

Graphene Oxide-Silver Nanoparticles in Molecularly-Imprinted Hybrid Films Enabling SERS Selective Sensing

Laboratorio di Scienza dei Materiali e Nanotecnologie (LMNT), Dipartimento di Chimica e Farmacia, Università di Sassari, CR-INSTM, Via Vienna 2, 07041 Sassari, Italy
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Received: 26 July 2018 / Revised: 23 August 2018 / Accepted: 3 September 2018 / Published: 10 September 2018
(This article belongs to the Section Advanced Nanomaterials)
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Abstract

A highly sensitive and selective Raman sensor has been developed by combining molecularly imprinted cavities, silver nanoparticles, and graphene oxide into a hybrid organic-inorganic film. The molecular imprinted nanocomposite material is an advanced platform that exhibits Graphene-mediated Surface-Enhanced Raman Scattering. The sensing layers have been prepared via sol-gel process and imprinted with rhodamine 6G to obtain selective dye recognition. Graphene oxide sheets decorated with silver nanoparticles have been incorporated into the matrix to enhance the Raman scattering signal. The template molecule can be easily removed from the films by ultrasonication in ethanol. A 712-fold Raman enhancement has been observed, which corresponds to a 2.15 × 1013 count·μmol−1 signal enhancement per molecular cavity. Besides Raman enhancement, the sensing platform has shown an excellent selectivity toward the test molecule with respect to similar dyes. In addition, the material can be reused at least 10 times without any loss of performance. View Full-Text
Keywords: molecular imprinting; graphene-mediated Surface-Enhanced Raman Scattering (G-SERS); organic-inorganic hybrid materials; Raman sensors molecular imprinting; graphene-mediated Surface-Enhanced Raman Scattering (G-SERS); organic-inorganic hybrid materials; Raman sensors
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Jiang, Y.; Carboni, D.; Malfatti, L.; Innocenzi, P. Graphene Oxide-Silver Nanoparticles in Molecularly-Imprinted Hybrid Films Enabling SERS Selective Sensing. Materials 2018, 11, 1674.

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