Sampling processes in emission spectroanalytical chemistry

Scheeline, Alexander

doi:10.1007/bf01242887

Cited by 11 publications

(5 citation statements)

References 58 publications

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“…A physical explanation for the latter case can be given based on the so called sheath layers of a gas discharge plasma existing in the vicinity of the electrodes 36 . Energy exchange between the plasma and the electrodes is mostly governed by these regions which responsible for the voltage drop over the discharge [37][38][39] . The energy delivered to the electrodes can be calculated by integrating the product of the voltage drop and the current 39,40 .…”

Section: Development Of a Spark Mixing Model Results Shown Inmentioning

confidence: 99%

Full range tuning of the composition of Au/Ag binary nanoparticles by spark discharge generation

Kohut

Villy

Kéri

et al. 2021

Sci Rep

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Gold/silver bimetallic nanoparticles still attract extensive interest due to their favorable properties e.g. in plasmonics or catalysis. We present here a facile and robust way for the production of clean Au/Ag binary nanoparticles (BNPs) with a total control over the composition via the spark discharge nanoparticle generation technique. With the application of pure Ag and Au electrodes, a tuning range of 55 to 90% Au content was achieved, but this can be further extended to the full 0 to 100% range by using a couple of alloyed electrodes. An added benefit of the approach is that either the concentration or the mean particle size can be kept constant at every composition by adjusting the generator parameters. Based on the systematic experimental data collected, a semi-empirical model for the prediction of the Au/Ag BNP composition was also developed. This model was used to calculate the theoretically achievable Au/Ag composition at a given spark parameter set in the parameter range most commonly used in the literature.

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Section: Development Of a Spark Mixing Model Results Shown Inmentioning

confidence: 99%

Full range tuning of the composition of Au/Ag binary nanoparticles by spark discharge generation

Kohut

Villy

Kéri

et al. 2021

Sci Rep

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“…A comprehensive overview of the methods applicable for gas discharges can be found in the book by Boumans, 50 while the fundamental mechanisms obtained during the analysis of the spark emission is reviewed by Scheeline. 49 These results serve as an important basis for the optical monitoring of electrical discharge-based NP generation; however, they cannot be directly applied for modern SDGs. The reason for this is, in contrast to the highly regulated and wellcontrolled analytical sparks, SDGs are mostly operated in "free running mode" when sparking occurs as soon as the breakdown voltage of the interelectrode gap is reached.…”

Section: Methodology and Applicationsmentioning

confidence: 99%

“…47 The development of the spectroscopic toolbox used for monitoring plasma-based NP generation dates back long before the introduction of the term "nanoparticle". Although in early research the occurrence of microscopic particulates was mostly considered as a side-effect, 48 the accumulated knowledge on material removal from the target, 49 on the excitation of different species, 50 or on the determination of important plasma parameters 51 provided valuable contribution to the plasma spectroscopic monitoring of current NP generation techniques. The application of lasers in monitoring the NP generation opens up further possibilities via selectively exciting particle populations even at different stages of their formation.…”

Section: Monitoring Of Nanoparticle Generationmentioning

confidence: 99%

Nanoparticles in analytical laser and plasma spectroscopy – a review of recent developments in methodology and applications

Galbács

Kéri

Kohut

et al. 2021

J. Anal. At. Spectrom.

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“…The high-voltage spark is very effective for conductive samples, but for poor conductors the technique has several drawbacks, but which may be overcome in several ways (2)(3)(4)(5)(6) but mostly by compacting the analysis samples into electrodes or by using auxiliary conducting electrodes. The demand in material characterization today is, however, more for direct solid-state techniques for trace spectroanalysis of non-conducting materials (7).…”

Section: Introductionmentioning

confidence: 99%

Characterization of sliding spark plasma source for direct trace spectronalysis

Angeyo

Golloch

2013

Radiation Effects and Defects in Solids

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The sliding spark plasma -which is produced via ablation of a dielectric material enforced between a pair of electrodes by a pulsed high-voltage discharge propagating along the dielectric surface -has immense potential as a simple but novel spectroscopic source for direct in situ quantitative analysis of nonconducting samples, a ubiquitous theme in material characterization. The plasma-excited optical spectrum spans a broad spectral range Vacuum Ultra Violet-Near Infra Red (VUV-NIR) and carries the atomic and molecular signatures of the base matrix chemical composition. Since the analytical figures of merit for quantitative spectroanalysis are a function of the spark source and dielectric matrix ablation characteristics, we systematically studied the sliding spark plasma source, utilizing a charge-coupled device spectrometer with blazed holographic grating in order to find the combination of parameters that can tailor the source for trace spectroanalysis of dielectrics in air and atmospheric pressure. It was observed that in the UV-vis spectral range a unique set of sample matrix conditions, besides spark source parameters, exists for enhanced trace analyte spectral emission with low signal-to-noise ratios and where trace spectrochemical analysis of dielectrics depends multivariately on spark scan frequency, electrode geometry, plasma discharge current, spark source inductance, initial rate of applied voltage, mode of sample ablation, and specific capacitance of the dielectric surface.

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Sampling processes in emission spectroanalytical chemistry

Cited by 11 publications

References 58 publications

Full range tuning of the composition of Au/Ag binary nanoparticles by spark discharge generation

Full range tuning of the composition of Au/Ag binary nanoparticles by spark discharge generation

Nanoparticles in analytical laser and plasma spectroscopy – a review of recent developments in methodology and applications

Characterization of sliding spark plasma source for direct trace spectronalysis

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