Synthesis and modelling of gold nanostars with tunable morphology and extinction spectrum

Trigari, Silvana; Rindi, Alessio; Margheri, Giancarlo; Sottini, S.; Dellepiane, G.; Giorgetti, E.

doi:10.1039/c0jm04519e

Cited by 96 publications

(104 citation statements)

References 37 publications

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“…These two bands could be attributed to the plasmon modes associated with the inner core and the branches of the nanostars, respectively. 34 The absorption spectrum of different morphological Au NPs were in consistent with the TEM results. Gold nanospheres and gold nanostars with good monodispersity exhibited narrow absorption peaks.…”

Section: Preparation and Characterization Of Goldsupporting

confidence: 86%

A Seedless, Surfactant-Free Synthesis of Gold Nanospheres, Nanosheets, and Nanostars Based on Functionalized Tryptophan

Bian¹,

Yuan²,

Han³

et al. 2016

j nanosci nanotechnol

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Three kinds of morphological gold nanoparticles (Au NPs), including gold nanospheres, gold nanosheets, and gold nanostars were easily synthesized using Tryptophan (Trp) modified with glutaraldehyde (GA) as reducing agent and stabilizer. This method can avoid using of seed and surfactant during the whole preparation process. The molar ratio of Trp-GA to chloroaurate ions plays a significant role in controlling the morphology of the Au NPs in aqueous environment. By adjusting the molar ratio of Trp-GA to chloroaurate ions, gold nanospheres, nanosheets, and nanostars can be easily obtained. Moreover, the as-prepared gold nanosheets and nanostars possess excellent SERS efficiency, demonstrating their potential as SERS tags for practical application.

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Section: Preparation and Characterization Of Goldsupporting

confidence: 86%

A Seedless, Surfactant-Free Synthesis of Gold Nanospheres, Nanosheets, and Nanostars Based on Functionalized Tryptophan

Bian¹,

Yuan²,

Han³

et al. 2016

j nanosci nanotechnol

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show abstract

“…According to previous calculations in 2D models, the plasmon resonant wavelength correlates with the branching [9, 25, 26]. The nanostar plasmon results from hybridization of the plasmon from each branch, while the plasmon peak intensity depends on the polarization angle [25].…”

Section: Introductionmentioning

confidence: 91%

“…Since 2003, several ‘one-pot’ or seed-mediated synthesis methods have been employed using mainly poly( N -vinylpyrrolidone) (PVP) or cetyltrimethylammonium bromide (CTAB) as surfactant [9, 10, 21–23, 25, 26, 30, 37–41]. Silver ions were also added to improve the yield and shape owing to the underpotential deposition of silver ions on certain crystal facets of gold seeds [22–24, 39, 42, 43].…”

Section: Introductionmentioning

confidence: 99%

Gold nanostars: surfactant-free synthesis, 3D modelling, and two-photon photoluminescence imaging

et al. 2012

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Understanding the control of the optical and plasmonic properties of unique nanosystems—gold nanostars—both experimentally and theoretically permits superior design and fabrication for biomedical applications. Here, we present a new, surfactant-free synthesis method of biocompatible gold nanostars with adjustable geometry such that the plasmon band can be tuned into the near-infrared region ‘tissue diagnostic window’, which is most suitable for in vivo imaging. Theoretical modelling was performed for multiple-branched 3D nanostars and yielded absorption spectra in good agreement with experimental results. The plasmon band shift was attributed to variations in branch aspect ratio, and the plasmon band intensifies with increasing branch number, branch length, and overall star size. Nanostars showed an extremely strong two-photon photoluminescence (TPL) process. The TPL imaging of wheat-germ agglutinin (WGA) functionalized nanostars on BT549 breast cancer cells and of PEGylated nanostars circulating in the vasculature, examined through a dorsal window chamber in vivo in laboratory mouse studies, demonstrated that gold nanostars can serve as an efficient contrast agent for biological imaging applications.

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“…A randomly branched gold nanostructure with a core size of 26-220 nm and a branch length of 8-114 nm have been recently produced by Trigari et al [111], with extinction spectra that can be tuned from visible up to 1,500 nm.…”

Section: Gold Nanostarsmentioning

confidence: 99%

How toxic are gold nanoparticles? The state-of-the-art

et al. 2015

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With the growing interest in the applications of gold nanoparticles in biotechnology and their physiological effects, possible toxicity of gold nanoparticles is becoming an increasingly important issue. A large number of studies carried out over the past few years under a variety of experimental conditions and following different protocols have produced conflicting results, leading to divergent views about the actual safety of gold nanoparticles in human applications.This work is intended to provide an overview of the most recent experimental results and thereby summarize current state-of-the-art. Rather than presenting a comprehensive review of the available literature in this field, which would be impractically broad, we have selected representative examples of both in vivo and in vitro studies, which clearly demonstrate the need for urgent and rigorous standardization of experimental protocols. Despite their significant potential, the safety of gold nanoparticles is highly controversial at this time, and important concerns have been raised that need to be properly addressed. Factors such as shape, size, surface charge, coating, and surface functionalization are expected to influence the interactions of particles with biological systems to a different extent, resulting in different outcomes and influencing the potential of gold nanoparticles for biomedical applications.Moreover, despite continuous attempts to establish a correlation between structure of the particles and their interactions with biological systems, we are still far from elucidating the toxicological profile of gold nanoparticles in an indisputable manner. This review is intended to contribute towards this goal, offering a number of suggestions on how to achieve the systematization of data on the most relevant physico-chemical parameters, which govern and control the toxicity of gold nanoparticles at cellular and whole-organism levels.

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Synthesis and modelling of gold nanostars with tunable morphology and extinction spectrum

Cited by 96 publications

References 37 publications

A Seedless, Surfactant-Free Synthesis of Gold Nanospheres, Nanosheets, and Nanostars Based on Functionalized Tryptophan

A Seedless, Surfactant-Free Synthesis of Gold Nanospheres, Nanosheets, and Nanostars Based on Functionalized Tryptophan

Gold nanostars: surfactant-free synthesis, 3D modelling, and two-photon photoluminescence imaging

How toxic are gold nanoparticles? The state-of-the-art

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