Direct chemical in-depth profile analysis and thickness quantification of nanometer multilayers using pulsed-rf-GD-TOFMS

Valledor, Rebeca; Pisonero, Jorge; Bordel, Nerea; Martín, José Ignacio; Quirós, C.; Tempez, A.; Sanz‐Medel, Alfredo

doi:10.1007/s00216-009-3382-8

Cited by 24 publications

(11 citation statements)

References 24 publications

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“…The GDOES spectra of the Ag:HAp-PDMS composite layer, presented in Figure 4 , indicate that the Si, O, C, H (atoms specific to a PDMS layer) [ 66 ], P, Ca, Ag, and O (atoms specific to a Ag:HAp layer) [ 67 ] depth profile curves have similar temporal behavior [ 34 ]. There is not any sharp increasing or decreasing in their depth profile curves as in the case of multilayer analysis [ 68 ]. Therefore, in correlation with the SEM and XPS analysis, the GD results indicate that during the thermal deposition process the Ag:HAp particles interact with the PDMS layer previously deposited on the silicon substrate determining the formation of a composite material.…”

Section: Resultsmentioning

confidence: 99%

Antimicrobial Activity Evaluation on Silver Doped Hydroxyapatite/Polydimethylsiloxane Composite Layer

Ciobanu

Groza

Iconaru

et al. 2015

BioMed Research International

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The goal of this study was the preparation, physicochemical characterization, and microbiological evaluation of novel hydroxyapatite doped with silver/polydimethylsiloxane (Ag:HAp-PDMS) composite layers. In the first stage, the deposition of polydimethylsiloxane (PDMS) polymer layer on commercially pure Si disks has been produced in atmospheric pressure corona discharges. Finally, the new silver doped hydroxyapatite/polydimethylsiloxane composite layer has been obtained by the thermal evaporation technique. The Ag:HAp-PDMS composite layers were characterized by various techniques, such as Scanning Electron Microscopy (SEM), Glow Discharge Optical Emission Spectroscopy (GDOES), and X-ray photoelectron spectroscopy (XPS). The antimicrobial activity of the Ag:HAp-PDMS composite layer was assessed against Candida albicans ATCC 10231 (ATCC—American Type Culture Collection) by culture based and confirmed by SEM and Confocal Laser Scanning Microscopy (CLSM) methods. This is the first study reporting the antimicrobial effect of the Ag:HAp-PDMS composite layer, which proved to be active against Candida albicans biofilm embedded cells.

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Section: Resultsmentioning

confidence: 99%

Antimicrobial Activity Evaluation on Silver Doped Hydroxyapatite/Polydimethylsiloxane Composite Layer

Ciobanu

Groza

Iconaru

et al. 2015

BioMed Research International

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“…Combining FAPA with a femtosecond laser may improve control of the LA process. Valledor et al performed depth profiling of thin metal films with nanometer depth resolution using pulsed-RF glow discharge TOF MS (RF-GD-TOFMS) [169]. In this technique, RF power generates plasma in argon, which sputters atoms and molecules from a surface.…”

Section: Depth Profilingmentioning

confidence: 99%

New mass spectrometry techniques for studying physical chemistry of atmospheric heterogeneous processes

Laskin

Nizkorodov

2013

International Reviews in Physical Chemistry

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Ambient particles and droplets have a significant effect on climate, visibility and human health. Once formed, they undergo continuous transformations through condensation and evaporation of water, uptake of low-volatility organic molecules and photochemical reactions involving various gaseous and condensed-phase species in the atmosphere. These transformations determine the physical and chemical properties of airborne particles, such as their ability to absorb and scatter solar radiation and nucleate cloud droplets. The complexity, heterogeneity and size of ambient particles make it challenging to understand the kinetics and mechanisms of their formation and chemical transformations. Mass spectrometry (MS) is a powerful analytical technique that enables detailed chemical characterisation of both small and large molecules in complex matrices. This capability makes MS a promising tool for studying chemical transformations of particles and droplets in the atmosphere. This review is focused on new and emerging experimental MS-based approaches for understanding the kinetics and mechanisms of such transformations. Some of the techniques discussed herein are best suited for ambient samples, while the others work best in laboratory applications. However, in combination, they provide a comprehensive arsenal of methods for characterisation of particles and droplets. In addition, we emphasise the role of fundamental physical chemistry studies in the development of new methods for chemical analysis of ambient particles and droplets.

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“…Analytical glow discharge (GD) optical emission spectrometry (OES) is a technique widely used for rapid compositional depth profiling of thin films and coated materials. 1,2 It has certain advantages for the direct analysis of solid samples due to its simplicity, rapid processing, low cost and high resolution compositional depth profiling compared with the competing techniques, such as Secondary Ion Mass Spectrometry (SIMS), 3 Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS), 4 Auger Electron Spectroscopy (AES) 5 and Glow Discharge Mass Spectrometry (GD-MS), 6 used for surface analysis. Though initially the use of a direct current (dc) discharge restricted GD-OES to conducting materials, the use of radio frequency (rf) discharges allowed the technique to be applied to non-conducting samples such as ceramics, glass, paint layers and oxide materials.…”

Section: Introductionmentioning

confidence: 99%

Comparison of a sample containing oxide with a pure sample with argon–oxygen mixtures

Mushtaq

Hoffmann

Steers

et al. 2012

J. Anal. At. Spectrom.

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Direct chemical in-depth profile analysis and thickness quantification of nanometer multilayers using pulsed-rf-GD-TOFMS

Cited by 24 publications

References 24 publications

Antimicrobial Activity Evaluation on Silver Doped Hydroxyapatite/Polydimethylsiloxane Composite Layer

Antimicrobial Activity Evaluation on Silver Doped Hydroxyapatite/Polydimethylsiloxane Composite Layer

New mass spectrometry techniques for studying physical chemistry of atmospheric heterogeneous processes

Comparison of a sample containing oxide with a pure sample with argon–oxygen mixtures

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