Anisotropic gold nanoparticles: A survey of recent synthetic methodologies

Ortiz-Castillo, José E.; Gallo‐Villanueva, Roberto C.; Madou, Marc; Pérez-González, Víctor H.

doi:10.1016/j.ccr.2020.213489

Cited by 96 publications

(58 citation statements)

References 261 publications

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“…Whereas these peaks were red-shifted to 547, 543, and 541 nm at 200 µM Au 3+ and 571, 561, and 572 nm at 300 µM Au 3+ , respectively. These results were consistent with the Mie’s theory which states that an increase of particle size leads the electric surface charge density and shifts the plasmon absorption band to longer wavelengths [ 23 ]. However, it is difficult to obtain the different desired SiO 2 @Au nanostructures as expected when using 1 mg SiO 2 @Au seed.…”

Section: Resultssupporting

confidence: 91%

“…While the average size of SiO 2 @Au seed was 200 ± 9 nm ( n = 170, Figure S2a ), the average size of SiO 2 @Au was 211 ± 7 nm ( n = 172, Figure S2b ). Consequently, the red-shifted and broadened absorbance properties of SiO 2 @Au nanostructures indicated the growth of Au NPs to bigger size on the SiO 2 surface [ 23 , 49 ]. Therefore, the SiO 2 @Au nanostructure synthesized at 150 µM Au 3+ was used for further study.…”

Section: Resultsmentioning

confidence: 99%

“…Based on their dimensions, Au nanostructures are classified as one-dimensional (1D) nanostructures (nanorods, nanowires, nanotubes, nanobelts); two-dimensional (2D) nanostructures (nanoplates such as nanoparticles, stars, pentagons, squares/rectangles, dimpled nanoplates, hexagons, truncated triangles); and three-dimensional (3D) nanostructures (nanotadpoles, nanodumbbells, nanopods, nanostars, and nanodendrites) [ 23 ]. Even though spherical or quasi-spherical Au NPs have received the most attention because of the ease of synthesis manipulation, anisotropically Au nanostructures exhibit unique physical and optical properties, such as low percolation threshold and surface plasmon resonance (SPR) [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Densely Immobilized Gold-Assembled Silica Nanostructures

Seong

Bock

Hahm

et al. 2021

IJMS

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In this study, dense gold-assembled SiO2 nanostructure (SiO2@Au) was successfully developed using the Au seed-mediated growth. First, SiO2 (150 nm) was prepared, modified by amino groups, and incubated by gold nanoparticles (ca. 3 nm Au metal nanoparticles (NPs)) to immobilize Au NPs to SiO2 surface. Then, Au NPs were grown on the prepared SiO2@Au seed by reducing chloroauric acid (HAuCl4) by ascorbic acid (AA) in the presence of polyvinylpyrrolidone (PVP). The presence of bigger (ca. 20 nm) Au NPs on the SiO2 surface was confirmed by transmittance electronic microscopy (TEM) images, color changes to dark blue, and UV-vis spectra broadening in the range of 450 to 750 nm. The SiO2@Au nanostructure showed several advantages compared to the hydrofluoric acid (HF)-treated SiO2@Au, such as easy separation, surface modification stability by 11-mercaptopundecanoic acid (R-COOH), 11-mercapto-1-undecanol (R-OH), and 1-undecanethiol (R-CH3), and a better peroxidase-like catalysis activity for 5,5′-Tetramethylbenzidine (TMB) and hydrogen peroxide (H2O2) reaction. The catalytic activity of SiO2@Au was two times better than that of HF-treated SiO2@Au. When SiO2@Au nanostructure was used as a surface enhanced Raman scattering (SERS) substrate, the signal of 4-aminophenol (4-ATP) on the surface of SiO2@Au was also stronger than that of HF-treated SiO2@Au. This study provides a potential method for nanoparticle preparation which can be replaced for Au NPs in further research and development.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis of Densely Immobilized Gold-Assembled Silica Nanostructures

Seong

Bock

Hahm

et al. 2021

IJMS

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“…Gold anisotropic nanostructures find important applications that encompass catalysis, sensing, and biomedicine, and their chemical synthesis has been recently reviewed [ 93 ]. There is an increasing interest towards the development of differently-shaped gold NPs and how morphology can be used to tune the properties of the final materials [ 94 ].…”

Section: Inorganic Nanostructure-templating Effects By Peptidesmentioning

confidence: 99%

Peptide Gelators to Template Inorganic Nanoparticle Formation

Bellotto

Cringoli

Perathoner

et al. 2021

Gels

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The use of peptides to template inorganic nanoparticle formation has attracted great interest as a green route to advance structures with innovative physicochemical properties for a variety of applications that range from biomedicine and sensing, to catalysis. In particular, short-peptide gelators offer the advantage of providing dynamic supramolecular environments for the templating effect on the formation of inorganic nanoparticles directly in the resulting gels, and ideally without using further reductants or chemical reagents. This mini-review describes the recent progress in the field to outline future research directions towards dynamic functional materials that exploit the synergy between supramolecular chemistry, nanoscience, and the interface between organic and inorganic components for advanced performance.

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“…Among other, gold nanotriangles (AuNTrs) stand out for unique optical and plasmonic properties, such as very large absorption and scattering cross-sections close to the near-infrared (NIR) region, which allow them to be one of the best candidates as heater-nanoparticle in hyperthermia cancer treatment [ 4 , 5 ]. Despite these features, AuNTrs are actually less investigated in comparison to gold nanorods, due to the high complexity of available synthetic protocols and poor yields [ 6 ]. Moreover, the particles obtained with nowadays procedures show big lateral dimensions (average edge length of about 284 nm [ 7 ]) and no AuNTrs with size below 50 nm could be found in the literature.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Ultrasmall Single-Crystal Gold–Silver Alloy Nanotriangles and Their Application in Photothermal Therapy

et al. 2021

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Photothermal therapy has always been a very attractive anti-cancer strategy, drawing a lot of attention thanks to its excellent performance as a non-invasive and pretty safe technique. Lately, nanostructures have become the main characters of the play of cancer therapy due to their ability to absorb near-infrared radiation and efficient light-to-heat conversion. Here we present the synthesis of polyethylene glycol (PEG)-stabilized hybrid ultrasmall (<20 nm) gold–silver nanotriangles (AuAgNTrs) and their application in photothermal therapy. The obtained AuAgNTrs were deeply investigated using high-resolution transmission electron microscopy (HR-TEM). The cell viability assay was performed on U-87 glioblastoma multiforme cell model. Excellent photothermal performance of AuAgNTrs upon irradiation with NIR laser was demonstrated in suspension and in vitro, with >80% cell viability decrease already after 10 min laser irradiation with a laser power P = 3W/cm2 that was proved to be harmless to the control cells. Moreover, a previous cell viability test had shown that the nanoparticles themselves were reasonably biocompatible: without irradiation cell viability remained high. Herein, we show that our hybrid AuAgNTrs exhibit very exciting potential as nanostructures for hyperthermia cancer therapy, mostly due to their easy synthesis protocol, excellent cell compatibility and promising photothermal features.

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Anisotropic gold nanoparticles: A survey of recent synthetic methodologies

Cited by 96 publications

References 261 publications

Synthesis of Densely Immobilized Gold-Assembled Silica Nanostructures

Synthesis of Densely Immobilized Gold-Assembled Silica Nanostructures

Peptide Gelators to Template Inorganic Nanoparticle Formation

Synthesis of Ultrasmall Single-Crystal Gold–Silver Alloy Nanotriangles and Their Application in Photothermal Therapy

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