Gold Nanoparticle/Tetrapyridylporphyrin Hybrid Material: Spectroscopic and Electrocatalytic Properties and Sensor Application

Santos, Jonnatan J.; Toma, Sérgio Hiroshi; Yatsuzuka, Rebeca Evahides; Araki, Koji

doi:10.21577/0103-5053.20200079

Cited by 1 publication

(1 citation statement)

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“…This enhancement of the electric field mainly allows the occurrence of plasmon-enhanced spectroscopic phenomena such as surface-enhanced Raman scattering (SERS) and surface-enhanced fluorescence (SEF). 6,7 SERS and SEF have been developed over the years to be applied in several areas, such as analytical chemistry, [6][7][8][9] biodiagnostics, [10][11][12] and materials science. [13][14][15] One major issue for plasmon-enhanced spectroscopies is the observation that nanoparticles of coinage metals (Au, Ag and Cu) interact strongly with each other and may form aggregates in suspension, which strongly affects both suspension stability and spectroscopic characteristics reproducibility.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Au@MnO2 Nanoparticles as Plasmon Enhanced Spectroscopy Substrates

Oliveira¹,

Neves²,

Peixoto³

et al. 2023

J. Braz. Chem. Soc.

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The plasmonic properties of Au nanoparticles (AuNP), which allow the observation of enhanced spectroscopic effects, are strongly affected by the aggregation and precipitation caused by the strong interactions between nanoparticles. To avoid AuNP aggregation and precipitation, the present study proposes coating with MnO2, forming AuNP@MnO2 core-shell structures. The MnO2 layers presented 1-10 nm thickness so that highly surface-enhanced fluorescence was obtained with maximum intensity given by 5 nm thick MnO2. The decrease in Raman intensity could be controlled, despite the inherent reduction in surface-enhanced Raman scattering (SERS) intensity with increasing adsorbate-surface distance. The decrease in Raman intensity was compensated by increasing AuNP stability caused by the MnO2 shell.

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