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Open AccessArticle

Atomic Force Microscope Guided SERS Spectra Observation for [email protected]@PVP Plasmonic Nanoparticles

1
Nanophotonics Research Center, Shenzhen University, Shenzhen 518060, China
2
Institute of Modern Optics, Nankai University, Tianjin 30071, China
3
Advanced Photonic Center, Southeast University, Nanjing 210096, China
4
College of Electronic Science and Technology, Shenzhen University, Shenzhen 518060, China
*
Author to whom correspondence should be addressed.
These authors contribute equally to this work.
Academic Editor: Xuejun Lu
Molecules 2019, 24(20), 3789; https://doi.org/10.3390/molecules24203789
Received: 21 August 2019 / Revised: 8 October 2019 / Accepted: 17 October 2019 / Published: 21 October 2019
(This article belongs to the Special Issue Optical Properties of Nanomaterials)
Recently polymer encapsulated surface-enhanced-Raman-scattering (SERS) probes with internal noble metal core–shell structure has found growing applications in biomedical applications. Here we studied the SERS spectra of [email protected][email protected] (4MBA: 4-mercaptobenzoic acid; PVP: polyvinylpyrrolidone) plasmonic nanoparticles produced from a chemical reduction method. By linking the atomic force microscope (AFM) with the homebuilt confocal Raman spectrometer thus to use AFM images as guidance, we realized the measurement of the SERS spectra from separated nanoparticles. We investigated the cases for single nanoparticles and for dimer structures and report several observed results including SERS spectra linearly scaled with laser power, abrupt boosting and abnormal shape changing of SERS spectra for dimer structures. Based on the finite element method simulation, we explained the observed ratio of SERS signals between the dimer structure and the single nanoparticle, and attributed the observed abnormal spectra to the photothermal effect of these plasmonic nanoparticles. Our study provides valuable guidance for choosing appropriate laser power when applying similar SERS probes to image biological cells. View Full-Text
Keywords: plasmonic nanoparticles; SERS probes; SERS spectra; AFM imaging; confocal Raman spectrometer; photothermal effect plasmonic nanoparticles; SERS probes; SERS spectra; AFM imaging; confocal Raman spectrometer; photothermal effect
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MDPI and ACS Style

Yang, L.; Xu, L.; Wu, X.; Fang, H.; Zhong, S.; Wang, Z.; Bu, J.; Yuan, X. Atomic Force Microscope Guided SERS Spectra Observation for [email protected]@PVP Plasmonic Nanoparticles. Molecules 2019, 24, 3789. https://doi.org/10.3390/molecules24203789

AMA Style

Yang L, Xu L, Wu X, Fang H, Zhong S, Wang Z, Bu J, Yuan X. Atomic Force Microscope Guided SERS Spectra Observation for [email protected]@PVP Plasmonic Nanoparticles. Molecules. 2019; 24(20):3789. https://doi.org/10.3390/molecules24203789

Chicago/Turabian Style

Yang, Liu; Xu, Libei; Wu, Xiuju; Fang, Hui; Zhong, Shenfei; Wang, Zhuyuan; Bu, Jing; Yuan, Xiaocong. 2019. "Atomic Force Microscope Guided SERS Spectra Observation for [email protected]@PVP Plasmonic Nanoparticles" Molecules 24, no. 20: 3789. https://doi.org/10.3390/molecules24203789

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