Size Control of Gold Nanoparticles During Laser Ablation In Liquids With Different Functional Molecules

Essaidi, A.; Schöps, Benjamin; Aumman, Andreas; Xiao, Shizhou; Esen, Cemal; Ostendorf, Andreas

doi:10.2961/jlmn.2013.02.0003

Cited by 16 publications

(7 citation statements)

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“…Usually, solutions containing surfactants are used as protective agents to inhibit NP growth and stabilize NPs sterically or electrosterically . Surfactants with different sizes and carbon chains usually exhibit different performances in controlling the stability and size of synthesized products . Surfactants with longer hydrocarbon chains stabilize the NPs more efficiently, whereas those with shorter chains result in larger NPs .…”

Section: Material Process Liquid and Laser Parametersmentioning

confidence: 99%

Laser Synthesis and Processing of Colloids: Fundamentals and Applications

2017

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Driven by functionality and purity demand for applications of inorganic nanoparticle colloids in optics, biology, and energy, their surface chemistry has become a topic of intensive research interest. Consequently, ligand-free colloids are ideal reference materials for evaluating the effects of surface adsorbates from the initial state for application-oriented nanointegration purposes. After two decades of development, laser synthesis and processing of colloids (LSPC) has emerged as a convenient and scalable technique for the synthesis of ligand-free nanomaterials in sealed environments. In addition to the high-purity surface of LSPC-generated nanoparticles, other strengths of LSPC include its high throughput, convenience for preparing alloys or series of doped nanomaterials, and its continuous operation mode, suitable for downstream processing. Unscreened surface charge of LSPC-synthesized colloids is the key to achieving colloidal stability and high affinity to biomolecules as well as support materials, thereby enabling the fabrication of bioconjugates and heterogeneous catalysts. Accurate size control of LSPC-synthesized materials ranging from quantum dots to submicrometer spheres and recent upscaling advancement toward the multiple-gram scale are helpful for extending the applicability of LSPC-synthesized nanomaterials to various fields. By discussing key reports on both the fundamentals and the applications related to laser ablation, fragmentation, and melting in liquids, this Article presents a timely and critical review of this emerging topic.

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Section: Material Process Liquid and Laser Parametersmentioning

confidence: 99%

Laser Synthesis and Processing of Colloids: Fundamentals and Applications

2017

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“…Preferential avoidance of surfactants to generate “naked” NPs has driven the development of laser-assisted synthesis methods. − One of the most popular techniques is pulsed laser ablation in liquid (PLAL), which involves irradiating a metal target immersed in solvent to generate plasma, vapor, and metal micro- or nanosized droplets, which can further react with the liquid medium to form NPs. , PLAL is emerging as a facile and versatile route to a variety of naked metal NPs, − metal alloy NPs, − and novel composite nanomaterials. − In particular, PLAL is widely used to make naked AuNPs, and some degree of size control is achievable by modifying ablation geometry, changing the solvent, introducing salts, − treating with successive laser fragmentation steps, − , or adding surfactants. − Despite the popularity of PLAL, proper AuNP size control without organic additives is still difficult, and products often exhibit high polydispersity. , …”

Section: Introductionmentioning

confidence: 99%

Kinetic Control of [AuCl₄]⁻ Photochemical Reduction and Gold Nanoparticle Size with Hydroxyl Radical Scavengers

et al. 2019

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Laser-induced photochemical reduction of aqueous [AuCl4]− is a green synthesis approach requiring no chemical reducing agents or stabilizers; but size control over the resulting gold nanoparticles remains a challenge. Under optical breakdown conditions producing hydrated electrons (eaq –) and hydroxyl radicals (OH•) through decomposition of water, [AuCl4]− reduction kinetics follow an autocatalytic rate law, which is governed by rate constants: nucleation rate k 1, dependent on eaq –; and growth rate k 2, dependent on the OH• recombination product, H2O2. In this work, we add the hydroxyl radical scavengers isopropyl alcohol and sodium acetate to limit H2O2 formation. Higher scavenger concentrations both lowered k 2 values and produced smaller gold nanoparticles with Gaussian size distributions and remarkably narrow mass-weighted size distributions. With sufficiently high scavenger concentrations, the mean nanoparticle size could be tuned from 3.8 to 6.1 nm with polydispersity indices below 0.08. Both the higher surface area-normalized catalytic activity of the gold nanoparticles synthesized in the presence of scavengers, and FTIR measurements, indicate no capping ligands on the nanoparticle surfaces. These results demonstrate that the size distributions of “naked” gold nanoparticles produced by photochemical [AuCl4]− reduction can be effectively tuned by controlling the reaction kinetics.

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“…It was observed that in the case of laser ablation, the size of the nanoparticles depends upon the size of surfactant molecules, laser uence, and concentration of the surfactant. 133,134 Like the laser ablation method, the arc discharge method is also carried out in solution. 132 In this, an arc discharge is applied between gold metal electrodes in aqueous and anhydrous ethanol medium to prepare GNPs.…”

Section: Synthesis Of Gold Nanoparticlesmentioning

confidence: 99%