Chemical approach to fabrication of semicontinuous Au nanolayers for SERS applications

Jankiewicz, Bartłomiej J.; Bartosewicz, Bartosz; Gajda-Rączka, Magdalena

doi:10.4302/plp.2013.2.05

Cited by 2 publications

(3 citation statements)

References 18 publications

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“…Chemical methods allow for fabrication, in solution or on surfaces, of nanostructures of various shapes including: nanospheres [5], spheres coated with a thin dielectric shell [10], dielectric core-metallic shell particles [11–12], nanostars [13], microflowers [14] and aggregates [15], just to mention a few examples. Gold and silver nanostructured surfaces on substrates can be fabricated by self-assembly of colloidal particles into monolayers [16], in the form of island films by seeding with nanoparticles followed by a reduction of metal salt [17–18], or in the form of other high surface area structures [19–20]. Chemical fabrication methods are powerful in terms of the vast variety of attainable structure types, possible enhancement factors, and low cost of fabrication.…”

Section: Introductionmentioning

confidence: 99%

Revisiting semicontinuous silver films as surface-enhanced Raman spectroscopy substrates

Liszewska

Budner

Norek

et al. 2019

Beilstein J. Nanotechnol.

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Surface-enhanced Raman spectroscopy (SERS) is a very promising analytical technique for the detection and identification of trace amounts of analytes. Among the many substrates used in SERS of great interest are nanostructures fabricated using physical methods, such as semicontinuous metal films obtained via electron beam physical vapor deposition. In these studies, we investigate the influence of morphology of semicontinuous silver films on their SERS properties. The morphologies studied ranged from isolated particles through percolated films to almost continuous films. We found that films below the percolation threshold (transition from dielectric-like to metal-like) made of isolated silver structures provided the largest SERS enhancement of 4-aminothiophenol (4-ATP) analyte signals. The substrate closest to the percolation threshold has the SERS signal about four times lower than the highest signal sample.

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Section: Introductionmentioning

confidence: 99%

Revisiting semicontinuous silver films as surface-enhanced Raman spectroscopy substrates

Liszewska

Budner

Norek

et al. 2019

Beilstein J. Nanotechnol.

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“…The unique chemical and physical properties of gold nanoparticles (AuNPs) make them suitable for a broad range of applications, including biomedicine, chemical, and biological sensing, surface-enhanced Raman spectroscopy (SERS), catalysis, organic solar cells, or enhancement of photonic crystal fibers’ thermal and electro-optical properties. − In biomedical sciences, AuNPs find applications in controlled drug delivery systems, precision therapeutics, diagnostics, and theranostics. − AuNPs are used alone or as composites with other materials in all mentioned applications. The functional properties of AuNPs can be tailored toward specific applications by changing their size, shape, surface chemistry, or aggregation state.…”

Section: Introductionmentioning

confidence: 99%

“…The unique chemical and physical properties of gold nanoparticles (AuNPs) make them suitable for a broad range of applications, 1 including biomedicine, 2 chemical, and biological sensing, 3 surface-enhanced Raman spectroscopy (SERS), 4 catalysis, 5 organic solar cells, 6 or enhancement of photonic crystal fibers’ thermal and electro-optical properties. 7 − 9 In biomedical sciences, AuNPs find applications in controlled drug delivery systems, precision therapeutics, diagnostics, and theranostics.…”

Section: Introductionmentioning

confidence: 99%

α-Amino Acids as Reducing and Capping Agents in Gold Nanoparticles Synthesis Using the Turkevich Method

Figat,

Bartosewicz,

Liszewska

et al. 2023

Langmuir

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Amino acid-capped gold nanoparticles (AuNPs) are a promising tool for various applications, including therapeutics and diagnostics. Most often, amino acids are used to cap AuNPs synthesized with other reducing agents. However, only a few studies have been dedicated to using α-amino acids as reducing and capping agents in AuNPs synthesis. Hence, there are still several gaps in understanding their role in reducing gold salts. Here, we used 20 proteinogenic α-amino acids and one non-proteinogenic α-amino acid in analogy to sodium citrate as reducing and capping agents in synthesizing AuNPs using the Turkevich method. Only four of the twenty-one investigated amino acids have not yielded gold nanoparticles. The shape, size distribution, stability, and optical properties of synthesized nanoparticles were characterized by scanning electron microscopy, differential centrifugal sedimentation, the phase analysis light scattering technique, and UV−vis spectroscopy. The physicochemical characteristics of synthesized AuNPs varied with the amino acid used for the reduction. We proposed that in the initial stage of gold salts reduction most of the used α-amino acids behave similarly to citrate in the Turkevich method. However, their different physicochemical properties resulting from differences in their chemical structures significantly influence the outcomes of reactions.

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Chemical approach to fabrication of semicontinuous Au nanolayers for SERS applications

Cited by 2 publications

References 18 publications

Revisiting semicontinuous silver films as surface-enhanced Raman spectroscopy substrates

Revisiting semicontinuous silver films as surface-enhanced Raman spectroscopy substrates

α-Amino Acids as Reducing and Capping Agents in Gold Nanoparticles Synthesis Using the Turkevich Method

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