3D nano-arrays of silver nanoparticles and graphene quantum dots with excellent surface-enhanced Raman scattering
Abstract
Active surface-enhanced Raman scattering (SERS) substrates, 3D nano-arrays of Ag nanoparticles (NPs) and graphene quantum dots (GQDs), were prepared using a photochemical approach and an electrophoresis deposition technique with the formation mechanism addressed. The GQDs (ca. 6 nm average) fit into the inter-particle gaps between Ag NPs, as verified by their scanning electron microscopy and high-resolution transmission electron microscopy. This deliberately designed 3D assembly of Ag NPs and GQDs could promote the synergistic effects of both components to further enhance the SERS performances according to both electromagnetic mechanism and chemical mechanism. Preliminary experiments show that the 3D substrates exhibited strong SERS signals comparing with bare Si substrates. This work provides a promising way for 3D SERS substrates.
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Article first published online: April 1, 2018
Issue published: April 2018
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Manuscript received: May 22, 2017
Revision received: November 16, 2017
Manuscript accepted: November 18, 2017
Published online: April 1, 2018
Issue published: April 2018
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This article was published in Materials Science and Technology.
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