Laser synthesis of colloidal Si@Au and Si@Ag nanoparticles in water via plasma-assisted reduction

Сараева, И. Н.; Luong, Nguyen Van; Kudryashov, S. I.; Rudenko, A. A.; Khmelnitskiy, R.A.; Шахмин, А. Л.; Kharin, Alexander; Ионин, А. А.; Zayarny, D. A.; Tung, Do Hoang; Duong, Pham Van; Minh, Pham Hong

doi:10.1016/j.jphotochem.2018.04.004

Cited by 32 publications

(28 citation statements)

References 57 publications

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“…Recently, the approaches of PLAL and laser photochemical reduction have been combined into a single process through ablation of a solid target either immersed in or subsequently exposed to metal salt solution, in what is termed reactive laser ablation in liquid (RLAL) [10,[45][46][47][48][49][50][51][52]. RLAL has been widely used to generate metal-silica nanostructures, including Si/M (M = Ag, Au, Pd, Pt) core/shell NPs [47], Ag-core/silica-shell NPs [48], and large silica particles decorated with Au or Ag NPs [49]. While these RLAL reports have demonstrated the generation of hybrid semiconductor-metal nanocomposite materials in a single step, the metal-silica products are too large for catalysis applications such as CO oxidation that typically requires sub-5 nm metal NPs [53][54][55][56].…”

Section: Introductionmentioning

confidence: 99%

“…In this work, we report a RLAL approach where a Si wafer immersed in a KAuCl 4 solution is ablated using sub-50 femtosecond (fs) laser pulses (fs-RLAL), producing significantly smaller silica-Au nanostructures than in previous reports using nanosecond lasers [47][48][49]. Using a high surface area support such as silica is commonly used to stabilize metal nanoparticles during catalytic reactions [60,61].…”

Section: Introductionmentioning

confidence: 99%

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One-step femtosecond laser ablation synthesis of sub-3 nm gold nanoparticles stabilized by silica

John

Tibbetts²

2019

Applied Surface Science

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We report the synthesis of silica-gold nanoparticles (silica-Au NPs) using a one-step femtosecond-reactive laser ablation in liquid (fs-RLAL) technique by focusing femtosecond laser pulses onto a silicon wafer immersed in an aqueous KAuCl 4 solution. Characterization of the silica-Au NPs revealed two populations of Au NPs: (i) larger, isolated Au NPs with diameter 7.0±2.0 nm, and (ii) smaller Au NPs (1.9±0.7 nm) stabilized by an amorphous silica matrix, along with new species of silicon observed from XPS analysis. The silica-Au NPs were catalytically active towards the model reaction of para-nitrophenol reduction by NaBH 4. The formation of the two populations of silica-Au NPs is ascribed to reaction dynamics occurring on two distinct timescales. First, the dense electron plasma formed within tens of femtoseconds of the laser pulse initiates reduction of the [AuCl 4 ]complex, leading to the formation of larger isolated Au NPs. Second, silicon species ejected from the wafer surface hundreds of picoseconds or later after the initial laser pulse reduce the remaining [AuCl 4 ]and encapsulate the growing clusters, forming ultrasmall Au NPs stabilized by the silica matrix. The morphologies of the silica-Au NPs generated from fs-RLAL are distinct from those reported in recent RLAL experiments with nanosecond lasers, reflecting distinct mechanisms occurring on the different pulse duration timescales.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

One-step femtosecond laser ablation synthesis of sub-3 nm gold nanoparticles stabilized by silica

John

Tibbetts²

2019

Applied Surface Science

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“…In contrast to the well-established ps and fs laser-induced photochemical conversion of aqueous [AuCl 4 ] − to AuNPs, the use of ns lasers has required the addition of support materials such as graphene oxide, 37,38 biopolymer films 39 or silicon surfaces 40–42 to aid in the reduction of [AuCl 4 ] − . A recent study reported that no [AuCl 4 ] − reduction occurred under irradiation with 1040 nm, 120 ns pulses at intensities up to 2.2 × 10 9 W cm − 2 in the absence of the silicon surface.…”

Section: Introductionmentioning

confidence: 99%

Nucleation and growth of gold nanoparticles initiated by nanosecond and femtosecond laser irradiation of aqueous [AuCl₄]⁻

Rodrigues

Bobb

John

et al. 2018

Phys. Chem. Chem. Phys.

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Irradiation of aqueous [AuCl4]− with 532 nm nanosecond (ns) laser pulses produces monodisperse (PDI = 0.04) 5-nm Au nanoparticles (AuNPs) without any additives or capping agents via a plasmon-enhanced photothermal autocatalytic mechanism. Compared with 800 nm femtosecond (fs) laser pulses, the AuNP growth kinetics under ns laser irradiation follow the same autocatalytic rate law, but with a significantly lower sensitivity to laser pulse energy. The results are explained using a simple model for simulating heat transfer in liquid water and at the interface with AuNPs. While the extent of water superheating with the ns laser is smaller compared to the fs laser, its significantly longer duration can provide sufficient energy to dissociate a small fraction of the [AuCl4]− present, resulting in the formation of AuNPs by coalescence of the resulting Au atoms. Irradiation of initially formed AuNPs at 532 nm results in plasmon-enhanced superheating of water, which greatly accelerates the rate of thermal dissociation of [AuCl4]− and accounts for the observed autocatalytic kinetics. The plasmon-enhanced heating under ns laser irradiation fragments the AuNPs and results in nearly uniform 5-nm particles, while the lack of particles’ heating under fs laser irradiation results in the growth of the particles as large as 40 nm.

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“…Recently, the approaches of PLAL and laser photochemical reduction have been combined into a single process through ablation of a solid target either immersed in or subsequently exposed to metal salt solution, in what is termed reactive laser ablation in liquid (RLAL) [10,[41][42][43][44][45][46][47][48]. RLAL has been widely used to generate metal-silica nanostructures, including Si/M (M = Ag, Au, Pd, Pt) core/shell NPs [43], Ag-core/silica-shell NPs [44], and large silica particles decorated with Au or Ag NPs [45]. While these RLAL reports have demonstrated the generation of hybrid semiconductor-metal nanocomposite materials in a single step, the metal-silica products are too large for catalysis applications such as CO oxidation that typically requires sub-5 nm metal NPs [49][50][51][52].…”

Section: Introductionmentioning

confidence: 99%

“…In this work, we report a RLAL approach where a Si wafer immersed in a KAuCl 4 solution is ablated using sub-50 femtosecond (fs) laser pulses (fs-RLAL), producing significantly smaller silica-Au nanostructures than in previous reports using nanosecond lasers [43][44][45]. Two populations of silica-Au NPs are formed in the fs-RLAL technique: (i) isolated ∼7 nm Au NPs, and (ii) sub-5 nm Au NPs embedded in an amorphous silica matrix.…”

Section: Introductionmentioning

confidence: 99%

One-Step Femtosecond Laser Ablation Synthesis of Sub-5 Nm Gold Nanoparticles Embedded in Silica

John¹,

Tibbetts²

2018

Preprint

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<div> <div> <div> <p>We report the synthesis of silica-gold nanoparticles (silica-Au NPs) using a one-step femtosecond-reactive laser ablation in liquid (fs-RLAL) technique by focusing femtosecond laser pulses onto a silicon wafer immersed in an aqueous KAuCl4 solution. Characterization of the silica-Au NPs revealed two populations of Au NPs: (i) larger, isolated Au NPs with diameter 7.3±2.1 nm, and (ii) smaller Au NPs (3.4±0.8 nm) embedded in an amorphous silica matrix, along with new species of silicon observed from XPS analysis. The catalytic activity of the silica-Au NPs towards the reduction of para-nitrophenol by NaBH4 is significantly higher compared to the control Au NPs synthesized in the absence of a silicon wafer and other Au NPs recently reported in literature. The formation of the two populations of silica-Au NPs is ascribed to reaction dynamics occurring on two distinct timescales. First, the dense electron plasma formed within tens of femtoseconds of the laser pulse initiates reduction of the [AuCl4]– complex, leading to the formation of larger isolated Au NPs. Second, silicon species ejected from the wafer surface hundreds of picoseconds or later after the initial laser pulse reduce the remaining [AuCl4 ]– and encapsulate the growing clusters, forming ultrasmall Au NPs embedded in the silica matrix. The morphologies of the silica-Au NPs generated from fs-RLAL are distinct from those reported in recent RLAL experiments with nanosecond lasers, reflecting distinct mechanisms occurring on the different pulse duration timescales. </p> </div> </div> </div>

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Laser synthesis of colloidal Si@Au and Si@Ag nanoparticles in water via plasma-assisted reduction

Cited by 32 publications

References 57 publications

One-step femtosecond laser ablation synthesis of sub-3 nm gold nanoparticles stabilized by silica

One-step femtosecond laser ablation synthesis of sub-3 nm gold nanoparticles stabilized by silica

Nucleation and growth of gold nanoparticles initiated by nanosecond and femtosecond laser irradiation of aqueous [AuCl₄]⁻

One-Step Femtosecond Laser Ablation Synthesis of Sub-5 Nm Gold Nanoparticles Embedded in Silica

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Laser synthesis of colloidal Si@Au and Si@Ag nanoparticles in water via plasma-assisted reduction

Cited by 32 publications

References 57 publications

One-step femtosecond laser ablation synthesis of sub-3 nm gold nanoparticles stabilized by silica

One-step femtosecond laser ablation synthesis of sub-3 nm gold nanoparticles stabilized by silica

Nucleation and growth of gold nanoparticles initiated by nanosecond and femtosecond laser irradiation of aqueous [AuCl4]−

One-Step Femtosecond Laser Ablation Synthesis of Sub-5 Nm Gold Nanoparticles Embedded in Silica

Contact Info

Product

Resources

About

One-step femtosecond laser ablation synthesis of sub-3 nm gold nanoparticles stabilized by silica

One-step femtosecond laser ablation synthesis of sub-3 nm gold nanoparticles stabilized by silica

Nucleation and growth of gold nanoparticles initiated by nanosecond and femtosecond laser irradiation of aqueous [AuCl₄]⁻