Interaction of energetic clusters (Au3, Au400 and C60) with organic material and adsorbed gold nanoparticles

Restrepo, Óscar A.; Prabhakaran, Aneesh; Delcorte, Arnaud

doi:10.1016/j.nimb.2010.11.014

Cited by 12 publications

(19 citation statements)

References 27 publications

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“…With the same kinetic energy, Au 400 projectiles were also unable to sputter organic material from metal organic surfaces. 10 Indeed, once again, upon impact on the nanoparticle, the generated recoil atoms have an energy that is too low to cause further sputtering of the organic material. In addition, the same study demonstrated that, for impacts on the organic substrate, much less sputtering could be observed with Au 400 than with C 60 or Au 3 and that the projectile was implanting quite deeply in the solid.…”

Section: Introductionmentioning

confidence: 99%

Au₄₀₀ Sputtering of a Polymer with Adsorbed Metal Nanoparticles: A Molecular Dynamics Study

Restrepo-Gutiérrez

Delcorte

2011

J. Phys. Chem. C

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Using molecular dynamics simulations, this article investigates the interaction of 5–40 keV Au400 projectiles with polyethylene and with gold-adsorbed nanoparticles of ∼25 Å in diameter. Impacts over the Au nanoparticles and on the polymer are compared in terms of sputtered quantities, projectile penetration, and energy deposition in the substrate, and connections with experiments are made. In the considered energy range, impacts over a nanoparticle emit 1 order of magnitude more organic material than impacts on the polymeric substrate. This is explained by the large range of the heavy Au400 projectile in the polymer and the increased stopping when it first encounters an adsorbed nanoparticle. As a result, we predict that organic material sputtering and analysis with Au400 should be favored by the presence of gold nanoparticles (metal-assisted secondary ion mass spectrometry). The simulations also indicate that the average depth of emission of organic material does not exceed 20 Å, and it is much less for impacts on the nanoparticles. Finally, Au400 projectiles with >10 keV of energy are able to sputter entire nanoparticles via pressure wave development and collective molecular motions in the organic substrate.

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Section: Introductionmentioning

confidence: 99%

Au₄₀₀ Sputtering of a Polymer with Adsorbed Metal Nanoparticles: A Molecular Dynamics Study

Restrepo-Gutiérrez

Delcorte

2011

J. Phys. Chem. C

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“…Although the use of some cluster primary ions (e.g. C 60 + and Bi + 3,5,7 ) on polymer samples do not lead to a yield enhancement on metallized samples, recent molecular dynamic simulations show that, using Au n clusters ions, the sputtering process could be enhanced by metallized samples …”

Section: Resultsmentioning

confidence: 99%

Insights into the yield enhancement and ion emission process in metal‐assisted SIMS

Nittler

Delcorte

Bertrand

et al. 2012

Surface & Interface Analysis

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Although nowadays the use of cluster ion sources seems to enhance the secondary ion emission for nearly all materials, the technique of metal-assisted SIMS can still give further insights in the secondary ion emission process. In this study, the metallization for static SIMS analysis was performed in situ. The combination of a detailed morphology study by SEM, TEM and the secondary yield enhancements in time-of-flight SIMS allows to develop a model explaining the secondary yield enhancement in metal-assisted SIMS.

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“…For monatomic ion beams, this hypothesis has been widely supported empirically and theoretically. [34][35][36][37]39,55,56 In a pair of studies, Heile et al 36,43 investigated the relationship between the primary ion beam composition and surface hardness and showed that as the effective thickness of the metal layer increases, there is a tradeoff between an accessible surface (i.e., uncoated area) and hardness. These findings partially explain the previous observation that metallization reduces ionization when polyatomic projectiles are used.…”

Section: Insights Into the Mechanism Of Meta-c 60 -Simsmentioning

confidence: 99%

Metal-assisted polyatomic SIMS and laser desorption/ionization for enhanced small molecule imaging of bacterial biofilms

Dunham

Comi

et al. 2016

Biointerphases

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Mass spectrometry imaging (MSI) has become an important analytical tool for many sectors of science and medicine. As the application of MSI expands into new areas of inquiry, existing methodologies must be adapted and improved to meet emerging challenges. Particularly salient is the need for small molecule imaging methods that are compatible with complex multicomponent systems, a challenge that is amplified by the effects of analyte migration and matrix interference. With a focus on microbial biofilms from the opportunistic pathogen Pseudomonas aeruginosa, the relative advantages of two established microprobe-based MSI techniques-polyatomic secondary ion mass spectrometry (SIMS) and laser desorption/ionization-are compared, with emphasis on exploring the effect of surface metallization on small molecule imaging. A combination of qualitative image comparison and multivariate statistical analysis demonstrates that sputtering microbial biofilms with a 2.5 nm layer of gold selectively enhances C 60 -SIMS ionization for several molecular classes including rhamnolipids and 2-alkyl-quinolones. Metallization also leads to the reduction of in-source fragmentation and subsequent ionization of media-specific background polymers, which improves spectral purity and image quality. These findings show that the influence of metallization upon ionization is strongly dependent on both the surface architecture and the analyte class, and further demonstrate that metal-assisted C 60 -SIMS is a viable method for small molecule imaging of intact molecular ions in complex biological systems.

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Interaction of energetic clusters (Au3, Au400 and C60) with organic material and adsorbed gold nanoparticles

Cited by 12 publications

References 27 publications

Au₄₀₀ Sputtering of a Polymer with Adsorbed Metal Nanoparticles: A Molecular Dynamics Study

Au₄₀₀ Sputtering of a Polymer with Adsorbed Metal Nanoparticles: A Molecular Dynamics Study

Insights into the yield enhancement and ion emission process in metal‐assisted SIMS

Metal-assisted polyatomic SIMS and laser desorption/ionization for enhanced small molecule imaging of bacterial biofilms

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Interaction of energetic clusters (Au3, Au400 and C60) with organic material and adsorbed gold nanoparticles

Cited by 12 publications

References 27 publications

Au400 Sputtering of a Polymer with Adsorbed Metal Nanoparticles: A Molecular Dynamics Study

Au400 Sputtering of a Polymer with Adsorbed Metal Nanoparticles: A Molecular Dynamics Study

Insights into the yield enhancement and ion emission process in metal‐assisted SIMS

Metal-assisted polyatomic SIMS and laser desorption/ionization for enhanced small molecule imaging of bacterial biofilms

Contact Info

Product

Resources

About

Au₄₀₀ Sputtering of a Polymer with Adsorbed Metal Nanoparticles: A Molecular Dynamics Study

Au₄₀₀ Sputtering of a Polymer with Adsorbed Metal Nanoparticles: A Molecular Dynamics Study