From nanorods to nanostars: Tuning the optical properties of gold nanoparticles

Kooij, Ernst S.; Ahmed, Waqqar; Hellenthal, Chris; Zandvliet, Henricus J.W.; Poelsema, Bene

doi:10.1016/j.colsurfa.2012.01.041

Cited by 56 publications

(28 citation statements)

References 31 publications

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“…Gold nanoparticles are important to bionanotechnology, owing to their easy synthesis, inert nature, good biocompatibility, and unique optical properties [1]. The tuning of optical properties of gold nanoparticles can be achieved by controlling the size of the nanoparticles [2]. Factors controlling the size of the gold nanoparticles are, namely, surface charge and double layer thickness [3].…”

Section: Introductionmentioning

confidence: 99%

Role of Surfactant in the Formation of Gold Nanoparticles in Aqueous Medium

Das

Chadha

Maiti

et al. 2014

Journal of Nanoparticles

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The stability of gold nanoparticles is a major issue which decides their impending usage in nanobiotechnological applications. Often biomimetically synthesized nanoparticles are deemed useless owing to their instability in aqueous medium. So, surfactants are used to stabilize the nanoparticles. But does the surfactant only stabilize by being adsorbed to the surface of the nanoparticles and not play significantly in moulding the size and shape of the nanoparticles? Keeping this idea in mind, gold nanoparticles (GNPs) synthesized by l-tryptophan (Trp) mediated reduction of chloroauric acid (HAuCl 4 ) were stabilized by anionic surfactant, sodium dodecyl sulphate (SDS), and its effect on the moulding of size and properties of the GNPs was studied. Interestingly, unlike most of the gold nanoparticles synthesis mechanism showing saturation growth mechanism, inclusion of SDS in the reaction mixture for GNPs synthesis resulted in a bimodal mechanism which was studied by UV-Vis spectroscopy. The mechanism was further substantiated with transmission electron microscopy. Zeta potential of GNPs solutions was measured to corroborate stability observations recorded visually.

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Section: Introductionmentioning

confidence: 99%

Role of Surfactant in the Formation of Gold Nanoparticles in Aqueous Medium

Das

Chadha

Maiti

et al. 2014

Journal of Nanoparticles

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“…Au is one of the first materials that found applications in nanoscale form centuries ago, and still Au nanostructures continue to be the focus of intense studies due to inertness and high quality with low concentration of defects [7–8]. Moreover, Au nanostructures can be synthesized by relatively simple colloidal chemistry methods in various sizes and shapes with high degree of quality by varying the solution composition and relative reactant concentrations [9], which in turn allows for accurate control of their intrinsic properties. For instance, Au nanospheres, nanocubes, nanorods and nanowires [10] have been routinely synthesized.…”

Section: Introductionmentioning

confidence: 99%

Tuning adhesion forces between functionalized gold colloidal nanoparticles and silicon AFM tips: role of ligands and capillary forces

Oras

Vlassov

Berholts

et al. 2018

Beilstein J. Nanotechnol.

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Adhesion forces between functionalized gold colloidal nanoparticles (Au NPs) and scanning probe microscope silicon tips were experimentally investigated by atomic force microscopy (AFM) equipped with PeakForce QNM (Quantitative Nanoscale Mechanics) module. Au NPs were synthesized by a seed-mediated process and then functionalized with thiols containing different functional groups: amino, hydroxy, methoxy, carboxy, methyl, and thiol. Adhesion measurements showed strong differences between NPs and silicon tip depending on the nature of the tail functional group. The dependence of the adhesion on ligand density for different thiols with identical functional tail-group was also demonstrated. The calculated contribution of the van der Waals (vdW) forces between particles was in good agreement with experimentally measured adhesive values. In addition, the adhesion forces were evaluated between flat Au films functionalized with the same molecular components and silicon tips to exclude the effect of particle shape on the adhesion values. Although adhesion values on flat substrates were higher than on their nanoparticle counterparts, the dependance on functional groups remained the same.

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“…The properties of AuNPs hold promising potential for drug delivery, diagnostics, plasmonic photothermal therapy of diseases, electronics, catalysis, and surface enhanced Raman scattering (SERS). [1][2][3][4][5] Gold nanoparticles have been produced in different shapes, such as nanospheres, nanorods, nanocages, nanoprism and urchin-like nanoparticles. Among these nanoparticles, gold nanoparticles (U-AuNPs) are very promising nanoparticles for SERS applications due to the presence of pointed peaks.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of urchin‐like gold nanoparticles using binary reducing agent composed of EDTA and hydroquinone

Hang

Phong

2018

Vietnam Journal of Chemistry

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Urchin-like gold nanoparticles (U-AuNPs) were successfully synthesized through a rapid one-pot seedless growth process. This method was carried out by using the combination of ethylenediaminetetraacetic acid (EDTA) and hydroquinone (HQ) as reducing agents. The effect of order of agents addition to the particle size was investigated. The obtained urchin-like gold nanoparticles (NPs) were characterized by XRD, TEM and UV-Vis absorption spectroscopy techniques. From the TEM analysis, it was found with different sizes of urchin-like gold nanoparticles from 55 to 102 nm.

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From nanorods to nanostars: Tuning the optical properties of gold nanoparticles

Cited by 56 publications

References 31 publications

Role of Surfactant in the Formation of Gold Nanoparticles in Aqueous Medium

Role of Surfactant in the Formation of Gold Nanoparticles in Aqueous Medium

Tuning adhesion forces between functionalized gold colloidal nanoparticles and silicon AFM tips: role of ligands and capillary forces

Facile synthesis of urchin‐like gold nanoparticles using binary reducing agent composed of EDTA and hydroquinone

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