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Hurtado-Morales M, Ortiz M, Acuña C, et al. Efficient fluorescence quenching in electrochemically exfoliated graphene decorated with gold nanoparticles. Nanotechnology. 2016;27(27):275702doi: 10.1088/0957-4484/27/27/275702.
Hurtado-Morales, M., Ortiz, M., Acuña, C., Nerl, H. C., Nicolosi, V., & Hernández, Y. (2016). Efficient fluorescence quenching in electrochemically exfoliated graphene decorated with gold nanoparticles. Nanotechnology, 27(27), 275702. https://doi.org/10.1088/0957-4484/27/27/275702
Hurtado-Morales, M, et al. "Efficient fluorescence quenching in electrochemically exfoliated graphene decorated with gold nanoparticles." Nanotechnology vol. 27,27 (2016): 275702. doi: https://doi.org/10.1088/0957-4484/27/27/275702
Hurtado-Morales M, Ortiz M, Acuña C, Nerl HC, Nicolosi V, Hernández Y. Efficient fluorescence quenching in electrochemically exfoliated graphene decorated with gold nanoparticles. Nanotechnology. 2016 Jul 08;27(27):275702. doi: 10.1088/0957-4484/27/27/275702. Epub 2016 May 27. PMID: 27232390.
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Nanotechnology. 2016 Jul 08;27(27):275702. doi: 10.1088/0957-4484/27/27/275702. Epub 2016 May 27.

Efficient fluorescence quenching in electrochemically exfoliated graphene decorated with gold nanoparticles.

Nanotechnology

M Hurtado-Morales, M Ortiz, C Acuña, H C Nerl, V Nicolosi, Y Hernández

Affiliations

  1. Nanomaterials Laboratory, Physics Department, Universidad de los Andes, Bogotá, Colombia.

PMID: 27232390 DOI: 10.1088/0957-4484/27/27/275702

Abstract

High surface area graphene sheets were obtained by electrochemical exfoliation of graphite in an acid medium under constant potential conditions. Filtration and centrifugation processes played an important role in order to obtain stable dispersions in water. Scanning electron microscopy and transmission electron microscopy imaging revealed highly exfoliated crystalline samples of ∼5 μm. Raman, Fourier transform infrared and x-ray photoelectron spectroscopy further confirmed the high quality of the exfoliated material. The electrochemically exfoliated graphene (EEG) was decorated with gold nanoparticles (AuNPs) using sodium cholate as a buffer layer. This approach allowed for a non-covalent functionalization without altering the desirable electronic properties of the EEG. The AuNP-EEG samples were characterized with various techniques including absorbance and fluorescence spectroscopy. These samples displayed a fluorescence signal using an excitation wavelength of 290 nm. The calculated quantum yield (Φ) for these samples was 40.04%, a high efficiency compared to previous studies using solution processable graphene.

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