Gold nanoparticle assembly on porous silicon by pulsed laser induced dewetting

Fulton, Alison Joy; Kollath, Vinayaraj Ozhukil; Karan, Kunal; Shi, Yujun

doi:10.1039/d0na00043d

Cited by 18 publications

(8 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in Figure a–d, complete dewetting of all four bilayer films, regardless of sputtering order and film thickness, were obtained to form NPs after only 1 laser pulse. This can be explained by the fast time scale of laser-induced melting and re-solidification of metals to fit within the 9 ns pulse width, , which was supported by the similar observation in multiple metal systems, such as Au on Ta and Si, Pt on Ta, and Ag on Si . Similar to what was observed for the four bilayer samples dewetted at various fluences as represented in Figures and , the PLiD of the two thicker films, i.e., Au(2.5 nm)Pt(2.5 nm) and Pt(2.5 nm)Au(2.5 nm), led to the formation of larger NPs with diameters in the range of 30 ± 6 to 48 ± 9 nm, which resulted in correspondingly lower dimple coverage of 14%–39%.…”

Section: Resultssupporting

confidence: 79%

“…The formation of metallic NPs, for example, Au and Pt NPs, on various substrates including dimpled Ta via PLiD has been described previously. ,, In brief, the samples of Au-Pt bilayer thin films on dimpled Ta substrates were mounted on a linear translator and placed in a vacuum chamber at a pressure of ∼1.0 × 10 –7 Torr. The bimetallic thin films were irradiated with the 355 nm UV output from a Nd:YAG laser (PRO-250-10, Spectra-Physics) with a repetition rate of 10 Hz and a pulse width of 9 ns.…”

Section: Experimental Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Pt-Rich Core/Au-Rich Shell Nanoparticle Formation Using Pulsed Laser-Induced Dewetting and Their Electrochemical Characteristics

et al. 2023

Self Cite

View full text Add to dashboard Cite

The formation of Au-Pt bimetallic nanoparticles (NPs) through the pulsed laser-induced dewetting (PLiD) of Au-Pt bilayer thin films on patterned dimpled Ta substrates was reported. It has been found that the total bilayer film thickness plays a determining role in the size of the NPs, whereas the NP size does not change much with the different sputtering order and laser fluence. The dimple coverage, characterizing the formation of NP arrays, depends mainly on the comparison of the NP diameter to the dimple size. Better overall coverages up to >90% were achieved from the NPs produced from PLiD of the two thinner films, i.e., Au(1.5 nm)Pt(1.5 nm) and Pt(1.5 nm)Au(1.6 nm). The energydispersive X-ray (EDX) spectroscopic analysis confirmed the presence of bimetallic Au-Pt NPs after dewetting. The X-ray photoelectron spectroscopic (XPS) measurements and electrochemical characterization using cyclic voltammetry of the produced bimetallic Au-Pt NPs both showed increased Au surface contents after PLiD, providing strong evidence for the formation of Pt-rich core/Au-rich shell NPs. The investigation of the electrochemical properties revealed stronger Pt−O bonding on the bimetallic Au-Pt NP surfaces. Furthermore, while Au is enriched on the Pt-rich core/Au-rich shell NP surfaces, a significant Pt content, ranging from 10% to close to 40%, is still present on the surface of the produced NPs, which could be useful for bifunctional electrocatalytic reactions.

show abstract

Section: Resultssupporting

confidence: 79%

Section: Experimental Methodsmentioning

confidence: 99%

Pt-Rich Core/Au-Rich Shell Nanoparticle Formation Using Pulsed Laser-Induced Dewetting and Their Electrochemical Characteristics

et al. 2023

Self Cite

View full text Add to dashboard Cite

show abstract

“…In addition, metal NPs trapped in a stationary liquid layer on the target surface can lead to plasma shielding and ultimately lower the laser ablation efficiency in liquids . Dewetting, including both pulsed laser-induced dewetting (PLiD) and thermal dewetting, of thin metallic films has recently been widely used to produce highly uniform monometallic , and bimetallic , NPs.…”

Section: Introductionmentioning

confidence: 99%

Formation and Removal of Alloyed Bimetallic Au–Ag Nanoparticles from Silicon Substrates for Tunable Surface Plasmon Resonance

Bonvicini

Shi

2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

The formation of alloyed Au–Ag bimetallic nanoparticles (NPs) by the solid-state thermal dewetting of Au–Ag bilayer thin films on Si substrates was reported in this work. Complete dewetting of the bilayer thin films to form alloyed Au–Ag bimetallic NPs can be achieved at temperatures above the Tammann temperature of at least one of the metal components. The NP size depends heavily on the total thickness of the bilayer thin films, whereas the atomic ratio of Au/Ag and the sputtering order in the bilayer films do not affect the NP size significantly. It has been demonstrated by X-ray photoelectron spectroscopy (XPS) analysis that the produced Au–Ag bimetallic NPs are alloyed and the sputtering order of Au and Ag in the initial bilayer films has no impact on the final configuration of the produced NPs. To further characterize the surface plasmon resonance (SPR) of Au–Ag NPs, a procedure involving the use of poly(vinyl alcohol) (PVA) and poly(methyl methacrylate) (PMMA) was developed to remove the bimetallic NPs from the optically opaque Si substrates. The SPR peak wavelength of the bimetallic Au–Ag alloy NPs has been shown to vary linearly with the atomic percentage of Au in the NPs, allowing for the tuning of the resonance wavelength by changing the alloy composition. The ability to produce uniform Au–Ag alloy NPs by thermal dewetting, the successful removal of the Au–Ag NPs from the Si substrates into the colloidal solution, the tunable SPR, and the excellent long-term stability of the alloy NPs in solution open up many opportunities for the potential applications of these Au–Ag alloy NPs, for example, for surface functionalization, sensing, and catalysis.

show abstract

“…277 A. Fulton and co-workers have assembled AuNPs on pSi substrates by pulsed laser-induced dewetting process. 278 This method produced uniform, randomly dispersed AgNPs with diameters in the range of 15 ± 7 nm to 89 ± 19 nm. There is another report by E. N. Roth giving the detailed methodology for bimetallic (AgNPs and AuNPs) deposition inside the pores of pSi, which has been accomplished by performing the immersion-plating under ultrasonic bath.…”

Section: Plasmonic Nps Capped Nanocrystalline Porous Siliconmentioning

confidence: 99%

“…For example, Zayer and co-workers demonstrated the controlled decoration of AgNPs on the pSi layer by drifted ions in electrolytic solution . A. Fulton and co-workers have assembled AuNPs on pSi substrates by pulsed laser-induced dewetting process . This method produced uniform, randomly dispersed AgNPs with diameters in the range of 15 ± 7 nm to 89 ± 19 nm.…”

Section: Plasmonic Nps Capped Nanocrystalline Porous Siliconmentioning

confidence: 99%

Silicon Nanostructures for Molecular Sensing: A Review

Vendamani

Rao

Pathak

2022

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

This review presents a comprehensive synopsis of the recent developments and achievements in the research of nanosensors composed of plasmonic nanoparticles (NPs) and silicon nanostructures (NSs) for effective trace-level molecular detection. This review focuses intensively on the methodologies for the preparation and enforcement of a variety of SiNSs including (a) metal nanoparticles decorated silicon nanowires (NWs), (b) metal nanodendrites (NDs) on Si substrate, (c) plasmonic NPs decorated nanocrystalline porous silicon (pSi), and (d) silicon composed hybrid nanostructures with favorable parameters of importance in sensing. Furthermore, their potency in wide molecular sensing applications, especially chemical, biological, and explosive molecules based on surface enhanced Raman scattering (SERS) phenomenon is discussed in detail. Various demonstrations and categorizations are provided on the topic of Si-based NSs for a clear understanding to diverse readers. A roadmap is also provided at the end for achieving superior sensing materials or devices in the future.

show abstract

Gold nanoparticle assembly on porous silicon by pulsed laser induced dewetting

Abstract: This work reports the influence of the substrate in the pulsed laser-induced dewetting (PLiD) of Au thin films for the fabrication of nanoparticle (NP) arrays.

Cited by 18 publications

References 61 publications

Pt-Rich Core/Au-Rich Shell Nanoparticle Formation Using Pulsed Laser-Induced Dewetting and Their Electrochemical Characteristics

Pt-Rich Core/Au-Rich Shell Nanoparticle Formation Using Pulsed Laser-Induced Dewetting and Their Electrochemical Characteristics

Formation and Removal of Alloyed Bimetallic Au–Ag Nanoparticles from Silicon Substrates for Tunable Surface Plasmon Resonance

Silicon Nanostructures for Molecular Sensing: A Review

Contact Info

Product

Resources

About