Journal
NANOMATERIALS
Volume 9, Issue 2, Pages -Publisher
MDPI
DOI: 10.3390/nano9020256
Keywords
surface enhanced Raman scattering; SERS; finite element method; density functional theory calculations; cell labeling; cancer
Categories
Funding
- Regional Ministry of Economy, Junta de Andalucia, Spain [FQM319, CTS677]
- Regional Ministry of Health, Junta de Andalucia, Spain [PI-0070/2008, PI-0068/2008]
- Spanish Ministry of Economy-Instituto de Salud Carlos III [PI-14-1600]
- Portuguese national funds from FCT/MEC [UID/Multi/04378/2013]
- ERDF [POCI-01-0145-FEDER-007728]
- European Union
- National Funds (FCT, Fundacao para a Ciencia e Tecnologia) [UID/QUI/50006/2013-POCI/01/0145/FEDER/007265]
- Programa Operacional Regional do Norte (ON.2 - O Novo Norte), under the Quadro de Referencia Estrategico Nacional (QREN)
- Fundo Europeu de Desenvolvimento Regional [NORTE-01-0145-FEDER-000011]
- Fundacao para a Ciencia e a Tecnologia, Portugal [EXPL/CTM-NAN/0754/2013, PTDC/CTM-NAN/2912/2014, SFRH/BPD/84018/2012]
- [P07-FQM-02595]
- [P10-FQM-06615]
- [P10-CTS-6928]
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/84018/2012, PTDC/CTM-NAN/2912/2014, EXPL/CTM-NAN/0754/2013] Funding Source: FCT
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Progress in the field of biocompatible SERS nanoparticles has promising prospects for biomedical applications. In this work, we have developed a biocompatible Raman probe by combining anisotropic silver nanoparticles with the dye rhodamine 6G followed by subsequent coating with bovine serum albumin. This nanosystem presents strong SERS capabilities in the near infrared (NIR) with a very high (2.7 x 10(7)) analytical enhancement factor. Theoretical calculations reveal the effects of the electromagnetic and chemical mechanisms in the observed SERS effect for this nanosystem. Finite element method (FEM) calculations showed a considerable near field enhancement in NIR. Using density functional quantum chemical calculations, the chemical enhancement mechanism of rhodamine 6G by interaction with the nanoparticles was probed, allowing us to calculate spectra that closely reproduce the experimental results. The nanosystem was tested in cell culture experiments, showing cell internalization and also proving to be completely biocompatible, as no cell death was observed. Using a NIR laser, SERS signals could be detected even from inside cells, proving the applicability of this nanosystem as a biocompatible SERS probe.
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