Stable gold nanoparticles obtained in pure acetone by laser ablation with different wavelengths

Giorgetti, E.; Muniz‐Miranda, Maurizio; Marsili, Paolo; Scarpellini, D.; Giammanco, F.

doi:10.1007/s11051-011-0648-9

Cited by 62 publications

(46 citation statements)

References 59 publications

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“…Rehbock et al,w ho investigated the influence of several anionso nt he particles ize and stability, also demonstrated the significance of anion polarization. [57] Furthermore, they showedt hat graphitic carbon was presenti ft he particlesw ere re-irradiated at aw avelength of l = 532 nm. Therefore, low solvent polarity alone cannot explain why the nanoparticles synthesized in acetonew ere much smaller than those synthesized in water.H owever,t he adsorption of molecules in acetonea nd the fact that they can undergo carbonizationa th igh temperatures is notable.…”

Section: Discussionmentioning

confidence: 99%

“…For laser-synthesized particles( l = 1064 nm), Giorgetti et al characterized goldn anoparticles in acetone by using Raman spectroscopy ando bserved vibration signals assigned to enolate groups on the particles urfaces. [57] Obviously,C uf eatures certain properties that trigger the formation of carbon-encapsulated Cu nanoparticles at l = 1064 nm PLAL in acetone.W et hink that Cu catalyzes the formation of graphite because Cu is an efficient catalystf or the formation of carbon-carbon bonds in, for example, Ullmann and Diels-Alder reactions. Cristoforetti et al observedd ifferent colloidal stability tendencies if workingi n acetoneo rt oluene, whichw as also attributed to different solvent polarities.…”

Section: Discussionmentioning

confidence: 99%

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Role of Dissolved and Molecular Oxygen on Cu and PtCu Alloy Particle Structure during Laser Ablation Synthesis in Liquids

et al. 2017

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The role of molecular oxygen dissolved in the solvent is often discussed as being an influential factor on particle oxidation during pulsed laser ablation in liquids. However, the formation of the particles during laser synthesis takes place under extreme conditions that enable the decomposition of the liquid medium. Reactive species of the solvent may then affect particle formation due to a chemical reaction in the reactive plasma. Experimental results show a difference between the role of dissolved molecular oxygen and the contribution from the oxygen in water molecules. Using a metallic Cu target in air-saturated water, laser ablation led to 20.5 wt % Cu, 11.5 wt % Cu O, and 68 wt % CuO nanoparticles, according to X-ray diffraction results. In contrast to particles obtained in air-saturated water, no CuO was observed in the colloid synthesized in a Schlenk ablation chamber in completely oxygen-free water. Under these conditions, less-oxidized nanoparticles (25 wt % Cu and 75 wt % Cu O) were synthesized. The results show that nanoparticle oxidation during laser synthesis is mainly caused by reactive oxygen species from the decomposition of water molecules. However, the addition of molecular oxygen promotes particle oxidation. Storage of the Cu colloid in the presence of dissolved oxygen leads, due to aging, to nanostructures with a higher oxidation state than the freshly prepared colloid. The XRD pattern of the sample prepared in air-saturated acetone showed no crystalline phases, which is possibly due to small crystallites or low particle concentration. Concentration of the particles by centrifugation showed that in the large fraction (>20 nm), even less oxidized nanoparticles (46 wt % Cu and 54 wt % Cu O) were present, although the solubility of molecular oxygen is higher in acetone than in water. The nanoparticles in acetone were stable due to a Cu-catalyzed graphite layer formed on their surfaces. The influence of the solvent on alloy synthesis is also crucial. Laser ablation of PtCu in air-saturated water led to separated large CuO and Pt-rich spherical nanoparticles, whereas homogeneous PtCu alloy nanoparticles were formed in acetone.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Role of Dissolved and Molecular Oxygen on Cu and PtCu Alloy Particle Structure during Laser Ablation Synthesis in Liquids

et al. 2017

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“…S4 and S5). The last influencing parameter on the high stability of thermally and mechanically loaded nanoparticles is a carbon layer, which is observed for laserbased nanoparticle synthesis in organic liquids [48,54]. The nanoparticles can be coated in situ by the oil's degradation products which emerge from oxidation and heat [47].…”

Section: Discussionmentioning

confidence: 99%

Colloidal Stability of Metal Nanoparticles in Engine Oil under Thermal and Mechanical Load

2017

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Extended colloidal stability and high dispersion degree of nanolubricants are required to avoid nanoparticle deposition in combustion engines and to reduce friction and wear. The simple and rapid one-step technique of pulsed laser ablation in liquids is employed to synthesize precursor-free and highly dispersed gold nanoparticles in lubricants while the colloidal stability is measured by optical spectroscopy and transmission electron microscopy. A remarkable colloidal stability is determined under engine-like and ambient conditions for nine months in terms of constant primary particle size. In contrast to additive-free oils, almost no agglomeration is observed, which might be attributed to the attachment of engine oil additives or pyrolyzed/oxidized molecules to the nanoparticles preventing attractive nanoparticle interactions.

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“…One of the widely employed types of nanomaterials with diameters between 1 and 100 nm are iron oxide NPs (IONPs). Much attention was drawn to their significant features, which make IONPs very suitable for potential technologic applications in materials engineering and biological sciences (Griesser et al, 2002;Harris, 2004;Fudouzi and Sawada, 2006;Gioux et al, 2010;Gabudean et al, 2012;Giorgetti et al, 2012;Frank et al, 2013;Garg et al, 2013;Gatto et al, 2013;Hasany et al, 2013;Ghosh and Collie, 2014;Gonella and Dai, 2014;Hashemizadeh and Huyeh, 2014;Hassan and Singh, 2014;Gui et al, 2015;Guisbiers et al, 2015;Harris et al, 2015;Helmbrecht et al, 2015;Garg, 2016). Since they are relatively nontoxic to human organs, magnetite and maghemite are selected to be used in biomedical applications.…”

Section: Metal Oxide Nps 321 Iron Oxidementioning

confidence: 99%

Hybrid nanomaterial: biocolloidals

Gözübenli¹,

Yasun²,

Dilsiz³

2017

Turk J Biol

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Nanomaterials-based diagnostics have tremendous advantages over other conventional diagnostic systems in terms of sensitivity, specificity, and portability owing to the unique intrinsic properties of nanomaterials. Thus, there is a substantial need to develop and employ a broad spectrum of nanomaterials for biological and diagnostic applications. In this review, we focus on nanomaterials-assisted disease diagnosis utilizing different techniques such as photoluminescence, colorimetry, fluorescence, electrochemistry, microarray methods, surface plasmon resonance, and surface-enhanced Raman spectroscopy. In these techniques, different nanomaterials, including but not limited to gold and silver materials, metal oxides, and semiconductors, were employed according to their all-purpose chemical and physical properties. As the new properties of nanomaterials are discovered, their contributions to nanobiotechnology applications are vastly increased. In this review, the features of the selected nanobiomaterials, biological tag-modified nanomaterials, and their outstanding applications for the detection of specific biotargets have been summarized according to the latest studies. Nanomaterials contribute to the fields of photo/chemotherapy and biomedical imaging in particular, since all the biological events happen within this size range and beneficiary roles of nanoparticles (NPs) are countless in biomedical applications due to their unique physical and chemical properties. However, due to the necessity of specificity and selectivity, there is a clear ambition to study bioconjugation of NPs to increase the efficiency of the targeted biological applications. Thus, the combination of the specificity and the intrinsic properties of biohybrid NPs facilitate diagnostic and therapeutic applications.

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Stable gold nanoparticles obtained in pure acetone by laser ablation with different wavelengths

Cited by 62 publications

References 59 publications

Role of Dissolved and Molecular Oxygen on Cu and PtCu Alloy Particle Structure during Laser Ablation Synthesis in Liquids

Role of Dissolved and Molecular Oxygen on Cu and PtCu Alloy Particle Structure during Laser Ablation Synthesis in Liquids

Colloidal Stability of Metal Nanoparticles in Engine Oil under Thermal and Mechanical Load

Hybrid nanomaterial: biocolloidals

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