Brazilian Journal of Physics

, Volume 48, Issue 5, pp 477–484 | Cite as

Effect of Gold Nanoparticles and Unwanted Residues on Raman Spectra of Graphene Sheets

  • Luis E. G. ArmasEmail author
  • Vitor M. Zamarion
  • Luis T. QuispeEmail author
  • Enrique P. U. Otero
  • J. W. Menezes
  • Lizandro B. R. Zegarra
  • Abdur Rahim
  • Koiti Araki
  • Henrique E. Toma
  • Carlos Jacinto
  • Chiara Valsechi
  • Antonio C. Seabra
Condensed Matter


We report the effect of gold nanoparticles (AuNPs) and unwanted sodium citrate residues (UnR) left after deposition of AuNPs by drop-casting method on the Raman spectra of graphene sheets (GS). The AuNPs solution was deposited on three different substrates: 5.0 wt% Yb3+-doped (Q5) phosphate glass, silica glass (S1), and Si/SiO2-300 nm (S2) substrates. For Q5 substrate, a slight increase in intensity of the G peak was observed, mostly for thinner layers, which can be attributed to a weak SERS effect shielded by UnR. The combination of the following aspects: a blue shift of the G band position, a slight increase in the FWHM (Full Width at Half Maximum), and a slight increase of the Raman intensities of both G and 2D bands in other GS without UnR supports the argument of shielded SERS effect. On the other hand, the effects of UnR on the S1 and S2 substrates produce a decrease on the Raman intensities of G and 2D bands, opposite to the effect produced by the AuNPs; this result was found more intense for the S2 substrate in relation to S1. This is possibly caused by the greater amount of UnR accumulated on the Si/SiO2 substrate, due to its higher hydrophilicity in relation to other samples. Additional Raman measurements reveal that the Raman intensity of GS in all substrates is unaffected by the presence of a possible humidity on GS, revealing the effect of UnR. Hence, it is vital to understand how residues influence the salient features of GS/AuNPs.


Graphene Drop-casting Gold nanoparticles Unwanted residues Raman spectroscopy Substrate effect Raman maps 



The authors would like to thank the Brazilian Agency CNPq for the partial financial support through the Project No. 460733/2014–1.


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Copyright information

© Sociedade Brasileira de Física 2018

Authors and Affiliations

  • Luis E. G. Armas
    • 1
    Email author
  • Vitor M. Zamarion
    • 2
  • Luis T. Quispe
    • 3
    Email author
  • Enrique P. U. Otero
    • 4
  • J. W. Menezes
    • 1
  • Lizandro B. R. Zegarra
    • 5
  • Abdur Rahim
    • 6
  • Koiti Araki
    • 2
  • Henrique E. Toma
    • 2
  • Carlos Jacinto
    • 7
  • Chiara Valsechi
    • 1
  • Antonio C. Seabra
    • 8
  1. 1.Grupo de Óptica, Micro e Nanofabricação de Dispositivos (GOMNDI)Universidade Federal do PampaRio Grande do SulBrazil
  2. 2.Instituto de QuímicaLaboratório de Nanotecnologia da Universidade de São PauloSão PauloBrazil
  3. 3.Laboratório de Filmes Finos e SuperfíciesUniversidade Federal de Santa Catarina-UFSCFlorianópolisBrazil
  4. 4.Departamento de Física da Universidade Federal de Roraima-UFRRBoa Vista-RoraimaBrazil
  5. 5.Departamento de Matemática de La Universidad Nacional del Santa—UNSChimbotePeru
  6. 6.Departament of Material Physics and NanotechnologyKhushal Khan Khattak UniversityKarakPakistan
  7. 7.Grupo de Fotônica e Fluidos Complexos, Instituto de FísicaUniversidade Federal de Alagoas – UFALMaceioBrazil
  8. 8.Laboratório de Sistemas Integráveis do Departamento de Engenharia de Sistemas Eletrônicos da Escola Politécnica da USP (LSI-PSI/EPUSP)São PauloBrazil

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