Au nanoparticles for SERS: Temperature-controlled nanoparticle morphologies and their Raman enhancing properties

Darienzo, Richard; Chen, Olivia; Sullivan, Maurinne; Mironava, Tatsiana; Tannenbaum, Rina

doi:10.1016/j.matchemphys.2019.122143

Cited by 25 publications

(27 citation statements)

References 57 publications

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“…When the surface of nanoparticles has the characteristics of dense interaction sites between incident photons and plasmon, the enhancement of Raman spectra is very significant. [56] Chaiyachate et al used discrete dipole approximation (DDA) method to theoretically reflect the optical absorption characteristics of core-shell nanoparticle structure from the perspective of physical calculation. It is found that with the thickening of the shell layer, the red shift of LSPR occurs.…”

Section: P E R S O N a L A C C O U N T T H E C H E M I C A L R E C O R Dmentioning

confidence: 99%

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Functionalized Gold Nanoparticles: Synthesis, Properties and Biomedical Applications

Fan

Cheng

Sun

2020

The Chemical Record

109

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Gold nanoparticles have excellent optical and plasmon properties and have enormous research potential when they combine with different ligands. Functionalized gold nanoparticles are widely used in drug delivery, biological detection, sensors, and even clinical treatment. At present, with the rapid development of functionalized gold nanoparticles, we think it is necessary to sort out the recent research results. In this paper, the synthesis, characteristics, and biological applications of the three aspects are introduced. Firstly, the synthetic methods of functionalized gold nanoparticles are reviewed, and the improvement of the commonly used synthetic methods is summarized. Then, the catalytic properties, oxidation resistance, and chirality optical properties are summarized in detail. Finally, we summarize the research progress in the field of biology in recent years.

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Section: P E R S O N a L A C C O U N T T H E C H E M I C A L R E C O R Dmentioning

confidence: 99%

Section: P E R S O N a L A C C O U N T T H E C H E M I C A L R E C O R Dmentioning

confidence: 99%

Functionalized Gold Nanoparticles: Synthesis, Properties and Biomedical Applications

Fan

Cheng

Sun

2020

The Chemical Record

109

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“…The power of SERS can be exploited for its versatility and feasibility in a wide variety of fields including polymers, materials science, biochemistry and bio-sensing, catalyst, electrochemistry, pesticides, and food additives [5][6][7][8][9]. SERS technique increases drastically the Raman signals of an analyte molecule by the presence of roughened metal noble-metals (Ag and Au) near or in proximity of the analyzed samples [10,11].…”

Section: Introductionmentioning

confidence: 99%

SERS Activity of Silver Nanosphere, Triangular Nanoplates, Hexagonal Nanoplates and Quasi-Spherical Nanoparticles: Effect of Shape and Morphology

2020

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In this work, we prepared different morphologies of silver nanoparticles: nanosphere, triangular nanoplates, hexagonal nanoplates, and quasi-spherical shapes, through one-step synthesis. Hydrogen peroxide was used as the oxidizing agent during the reduction of silver nitrate by sodium borohydride, in the presence of tri-sodium citrate and poly-vinyl-pyrrolidone. The obtained silver nanoparticles were fully characterized by UV-Vis spectroscopy, Dynamic Light Scattering and Scanning Electron Microscopy, and successfully used as Surface Enhanced Raman Scattering (SERS) substrates. The effect of shape and morphology on the Raman scattering enhancement was evaluated by using methylene blue as target molecules. The Raman measurements demonstrated that the prepared substrates are reliable and sensitive with analytical enhancement factors, estimated to be around 105 with a concentration of methylene blue 1 μM. When triangular and hexagonal nanoplates were tested with different concentrations of analyte, they demonstrated a good linearity in Raman intensity with a good detection of methylene blue 0.1 μM.

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“…4e shows the Raman mapping of MG at 1587 cm −1 peak over a 21 × 21 μm 2 area with a step size of 1 μm, which also shows that the distribution of the Raman intensity on the Ag nanowalnuts substrate is uniform. The SERS performance of Ag nanowalnuts is further expressed by enhancement factor (EF) using the following equation [21]:…”

Section: Resultsmentioning

confidence: 99%

“…4 e shows the Raman mapping of MG at 1587 cm −1 peak over a 21 × 21 μm 2 area with a step size of 1 μm, which also shows that the distribution of the Raman intensity on the Ag nanowalnuts substrate is uniform. The SERS performance of Ag nanowalnuts is further expressed by enhancement factor (EF) using the following equation [21]:

EF = ()(, I_{SERS} * C_{RS}) / ()(, I_{RS} * C_{SERS})

where I SERS and I RS are the intensities of 4‐MBA or MG with and without Ag nanowalnuts, respectively, and C SERS and C RS are the concentrations of 4‐MBA or MG with and without Ag nanowalnuts, respectively. According to the equation, the EF of 4‐MBA and MG are 2.3 × 10 −6 and 1.8 × 10 −6 , respectively.…”

Section: Resultsmentioning

confidence: 99%

In‐situ seeding synthesis of walnut kernel‐like Ag nanostructures with highly efficient SERS performance

Dong

2020

Micro & Nano Letters

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By an in-situ seeding synthetic route, with biocompatible reagents being used, walnut kernel-like Ag nanostructures (Ag nanowalnuts) composed of nanoplates were fabricated. The in-situ formation of seeds and introduction of complex [Ag 3 (C 6 H 5 O 7) n+1 ] 3n− were indispensable steps for this kind of self-assembled nanostructure. The size of Ag nanowalnuts was in the range of 200-400 nm and the thickness of a single nanoplate was about 30 nm. The morphology of nanoplates was of variety, and their surface was bumpy. Such Ag nanostructures with rough surface and high curvature provided plenty of 'hot spots' on a single particle for surface-enhanced Raman scattering (SERS) enhancement. Experimental results indicated that the Ag nanowalnuts offered great surface enhancement for 4-mercaptobenzoic acid and malachite green molecules. The limit of detection was low to 10 −10 and 10 −8 M, respectively.

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Au nanoparticles for SERS: Temperature-controlled nanoparticle morphologies and their Raman enhancing properties

Cited by 25 publications

References 57 publications

Functionalized Gold Nanoparticles: Synthesis, Properties and Biomedical Applications

Functionalized Gold Nanoparticles: Synthesis, Properties and Biomedical Applications

SERS Activity of Silver Nanosphere, Triangular Nanoplates, Hexagonal Nanoplates and Quasi-Spherical Nanoparticles: Effect of Shape and Morphology

In‐situ seeding synthesis of walnut kernel‐like Ag nanostructures with highly efficient SERS performance

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