Gold nanoflowers grown in a porous Si/SiO2 matrix: The fabrication process and plasmonic properties

Осминкина, Л. А.; Žukovskaja, Olga; Agafilushkina, Svetlana N.; Kaniukov, Egor; Stránik, Ondrej; Gonchar, K. A.; Yakimchuk, Dzmitry; Bundyukova, Victoria; Chermoshentsev, Dmitry A.; Dyakov, Sergey A.; Gippius, N. A.; Weber, Karina; Popp, Jürgen; Cialla‐May, Dana; Sivakov, Vladimir

doi:10.1016/j.apsusc.2019.144989

Cited by 26 publications

(17 citation statements)

References 37 publications

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“…The high intensity peak in the SERS spectra located at 520 cm −1 corresponds to the crystalline silicon in porous matrix, at 1380 cm −1 originates from combined stretching of the NCS-ring and peak at 1007 cm −1 and 1240 cm −1 relates to the C-S stretching modes [34]. It is well-known and previously published by our group on similar nanostructures [27,35], that chemically reactive (e.g., thiol in 2-Mercaptopyridin) groups containing molecules have strong chemical binding with metal surfaces, that can significantly affect SERS signal intensity due to the Raman signal enhancement as a consequence of chemical factor. In present study, SERS spectrum for the lowest MBT concentration of 10 −8 M cannot be detected that can be explained by the lower MBT molecules cross-linking of the gold nanostructures surface.…”

Section: Sers On Obtained Gold Nanostructuresmentioning

confidence: 58%

“…Considering the fact that silver and copper nanostructures have low long-term chemical stability against oxidation at ambient atmospheric conditions, especially in water-based solutions, the implementation of gold nanostructures is more realistic. In our previous work, we have already demonstrated the possibility of obtaining gold nanostructures by means of template synthesis [27]. It is important to note that the proposed synthesis method uses "simple" chemistry to produce plasmonic-active nanostructures, which allows us to avoid the consumption of organic additives during the synthesis, and as a consequence, leads to low contamination of the gold surface with derivatives of hydrocarbons.…”

Section: Introductionmentioning

confidence: 99%

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Morphology and Microstructure Evolution of Gold Nanostructures in the Limited Volume Porous Matrices

Yakimchuk¹,

Bundyukova²,

Ustarroz

et al. 2020

Sensors

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The modern development of nanotechnology requires the discovery of simple approaches that ensure the controlled formation of functional nanostructures with a predetermined morphology. One of the simplest approaches is the self-assembly of nanostructures. The widespread implementation of self-assembly is limited by the complexity of controlled processes in a large volume where, due to the temperature, ion concentration, and other thermodynamics factors, local changes in diffusion-limited processes may occur, leading to unexpected nanostructure growth. The easiest ways to control the diffusion-limited processes are spatial limitation and localized growth of nanostructures in a porous matrix. In this paper, we propose to apply the method of controlled self-assembly of gold nanostructures in a limited pore volume of a silicon oxide matrix with submicron pore sizes. A detailed study of achieved gold nanostructures’ morphology, microstructure, and surface composition at different formation stages is carried out to understand the peculiarities of realized nanostructures. Based on the obtained results, a mechanism for the growth of gold nanostructures in a limited volume, which can be used for the controlled formation of nanostructures with a predetermined geometry and composition, has been proposed. The results observed in the present study can be useful for the design of plasmonic-active surfaces for surface-enhanced Raman spectroscopy-based detection of ultra-low concentration of different chemical or biological analytes, where the size of the localized gold nanostructures is comparable with the spot area of the focused laser beam.

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Section: Sers On Obtained Gold Nanostructuresmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Morphology and Microstructure Evolution of Gold Nanostructures in the Limited Volume Porous Matrices

Yakimchuk¹,

Bundyukova²,

Ustarroz

et al. 2020

Sensors

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“…Figure 1 shows planar images of the obtained PSi films with different pore sizes as well as planar and cross-sectional SEM images of the same samples after gold deposition (Au/PSi). The gold coating of PSi films was performed at room temperature by chemical deposition of Au nanoparticles (Au NPs) due to the reduction of gold (III) chloride (AuCl 3 ) in HF [ 19 ].…”

Section: Resultsmentioning

confidence: 99%

“…Gold coating of PSi layers (Au/PSi) was performed at room temperature by electroless wet-chemical deposition of Au nanoparticles on silicon nanocrystals by reducing of 0.02 M gold (III) chloride (AuCl 3 ) in 5 M HF, taken in the ratio 1 : 1, for 20 s as described in our previous work [ 19 ]. Finally, the samples were rinsed several times in Millipore water and dried at room temperature.…”

Section: Methodsmentioning

confidence: 99%

“…The plasmonic surfaces, which include solid substrate with metallic nanostructures and chemically synthesized noble metal colloids, and their fabrication methods were reviewed in a number of papers [ 15 , 16 , 17 ]. From another side, a number of publications have shown that different porous materials can be used as a matrix for SERS-active metals, for example: alumina [ 18 ], porous Si/SiO 2 [ 19 ], porous silicon [ 20 ], silicon nanowires [ 9 , 21 , 22 ], porous titanium oxide [ 23 ] and porous silver [ 13 ]. As is well-known, the bio-friendly properties [ 24 ] of porous silicon have been proven to act as a biocompatible and biodegradable material [ 25 , 26 ], as shown in a number of papers related to its biomedical applications [ 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

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Raman Signal Enhancement Tunable by Gold-Covered Porous Silicon Films with Different Morphology

Agafilushkina

Žukovskaja

Dyakov

et al. 2020

Sensors

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The ease of fabrication, large surface area, tunable pore size and morphology as well surface modification capabilities of a porous silicon (PSi) layer make it widely used for sensoric applications. The pore size of a PSi layer can be an important parameter when used as a matrix for creating surface-enhanced Raman scattering (SERS) surfaces. Here, we evaluated the SERS activity of PSi with pores ranging in size from meso to macro, the surface of which was coated with gold nanoparticles (Au NPs). We found that different pore diameters in the PSi layers provide different morphology of the gold coating, from an almost monolayer to 50 nm distance between nanoparticles. Methylene blue (MB) and 4-mercaptopyridine (4-MPy) were used to describe the SERS activity of obtained Au/PSi surfaces. The best Raman signal enhancement was shown when the internal diameter of torus-shaped Au NPs is around 35 nm. To understand the role of plasmonic resonances in the observed SERS spectrum, we performed electromagnetic simulations of Raman scattering intensity as a function of the internal diameter. The results of these simulations are consistent with the obtained experimental data.

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Biomolecular Corona Associated with Nanostructures: The Potentially Disruptive Role of Raman Microscopy

Battaglini

Gümüş

Ciofani

2021

Adv Materials Technologies

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investigating the use of nanomaterials within living organisms. When a nanoparticle (NP) encounters biological molecules such as proteins, lipids, nucleic acids, or polysaccharides, it tends to adsorb these molecules on its surface due to electrostatic, hydrophobic, or other forms of interactions between the molecules and the surface of the NP. [1][2][3][4] Depending on their abundance and affinity, proteins and other molecules may form a hard corona that consists of tightly bounded proteins on the surface, or a soft corona, which indicates a second layer of proteins that are loosely attached to the proteins of the hard corona. [4] The composition of the soft corona changes over time according to the environmental conditions, and so the biological identity of nanostructures is usually, but not always, determined by the hard corona. This can be both advantageous and disadvantageous to the application of NPs. Some studies have focused on preventing biomolecular corona (BC) formation, as this may change the size and surface properties, hinder modifications on the surface, and cause the rapid detection and clearance of NPs by the immune system. [5,6] However, BCs can be exploited or even altered, in order to be made beneficial for targeting purposes as they can enable specific cells to more easily recognize NPs and may lead to a reduction in their toxicity. [7,8] A wide range of techniques have been used in BC studies, such as dynamic light scattering (DLS), [9] sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), mass spectrometry (MS)-based approaches, [10][11][12][13][14][15][16][17][18][19][20][21] UV/vis spectroscopy, Fourier-transform infrared spectroscopy (FTIR), [22] atomic force microscopy (AFM), [23] scanning electron microscopy (SEM), [24][25][26][27] transmission electronic microscopy (TEM), [23] and circular dichroism spectroscopy (CD). [28] Various information (size, surface properties, morphology, structure, etc.) about BCs can be obtained through these methods. Many techniques have been applied in BC studies, which can be divided into microscopybased approaches that use direct imaging of the sample, and indirect techniques. Microscopy techniques can provide information about corona composition and shape with a spatial resolution up to the dimension scale of single protein molecules, but they are limited by the requirement for staining or extensive sample preparation. Indirect techniques can provide extensive information about BC-nanostructure interactions and properties, but typically have a limited resolution and so cannot analyze the BC at the level of single nanostructures. Other emerging

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Gold nanoflowers grown in a porous Si/SiO2 matrix: The fabrication process and plasmonic properties

Cited by 26 publications

References 37 publications

Morphology and Microstructure Evolution of Gold Nanostructures in the Limited Volume Porous Matrices

Morphology and Microstructure Evolution of Gold Nanostructures in the Limited Volume Porous Matrices

Raman Signal Enhancement Tunable by Gold-Covered Porous Silicon Films with Different Morphology

Biomolecular Corona Associated with Nanostructures: The Potentially Disruptive Role of Raman Microscopy

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