Graphene Oxide/Gold Nanorod Nanocomposite for Stable Surface-Enhanced Raman Spectroscopy

Autor(es)

Vianna, Pilar G. ^[1] ; Grasseschi, Daniel ^[1] ; Costa, Greice K. B. ^{[2, 3]} ; Carvalho, Isabel C. S. ^[2] ; Domingues, Sergio H. ^[1] ; Fontana, Jake ^[4] ; de Matos, Christiano J. S. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Prebiteriana Mackenzie, MackGraphe Graphene & Nanomat Res Ctr, BR-01302907 Sao Paulo - Brazil

^[2] Pontificia Univ Catolica Rio de Janeiro, Dept Phys, BR-22451900 Rio De Janeiro - Brazil

^[3] Univ Fed Rio de Janeiro, Photon & Instrumentat Lab, BR-21941598 Rio de Janeiro - Brazil

^[4] Naval Res Lab, 4555 Overlook Ave SW, Washington, DC 20375 - USA

• Tipo de documento: Artigo Científico
• Fonte: ACS PHOTONICS; v. 3, n. 6, p. 1027-1035, JUN 2016.
• Citações Web of Science: 22

Resumo

We introduce a graphene oxide/gold nanorod nano composite as a surface-enhanced Raman spectroscopy (SERS) substrate that suppresses the usual temporal intensity fluctuations, commonly referred to as blinking. The temporal stability of the SERS spectra from the nanocomposite is statistically determined using the coefficient of variation of the integrated spectra. We demonstrate that, by introducing graphene oxide, the coefficient of variation from the nanocomposite is five times smaller when compared to gold nanorods without graphene oxide, which is attributed to the removal of the nanorod's surfactant from plasmonic hot spots due to graphene oxide surfactant interaction. The resulting nanocomposite can, then, be used as a reliable substrate for precise SEAS chemical analysis. The nanocomposite is, therefore, analyzed as a SERS substrate for the detection of Rhodamine 640, providing a 4-fold stability improvement relative to gold nanorods without graphene oxide, while the dye's Raman signal is enhanced both by SERS and by resonant excitation. (AU)

• Processo FAPESP: 15/11779-4 - Efeitos plasmônicos e não-lineares em grafeno acoplado a guias de onda ópticos
• Beneficiário: Christiano José Santiago de Matos
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 15/10405-3 - Síntese, caracterização, funcionalização e ordenação de nanoestruturas metálicas
• Beneficiário: Daniel Grasseschi
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 12/50259-8 - Grafeno: fotônica e opto-eletrônica: colaboração UPM-NUS
• Beneficiário: Antonio Helio de Castro Neto
• Modalidade de apoio: Auxílio à Pesquisa - Programa SPEC