ToF-SIMS spectra multivariate analyses for the chemical characterization of microelectronic low-k materials

2014 ◽  
Vol 46 (S1) ◽  
pp. 213-216 ◽  
Author(s):  
R. Scarazzini ◽  
M. Lépinay ◽  
L. Broussous ◽  
J. P. Barnes ◽  
M. Veillerot ◽  
...  
Keyword(s):  
Multivariate Analyses ◽  
Chemical Characterization ◽  
Tof Sims ◽  
Low K

scholarly journals Chemical Evaluation of Eumelanin Maturation by ToF-SIMS and Alkaline Peroxide Oxidation HPLC Analysis

2020 ◽  
Vol 22 (1) ◽  
pp. 161
Author(s):  
Martin Jarenmark ◽  
Peter Sjövall ◽  
Shosuke Ito ◽  
Kazumasa Wakamatsu ◽  
Johan Lindgren
Keyword(s):  
Molecular Structure ◽  
Secondary Ion Mass Spectrometry ◽  
Chemical Characterization ◽  
Experimental Treatment ◽  
Negative Ion ◽  
Pressure Treatment ◽  
Peroxide Oxidation ◽  
Specific Chemical ◽  
Tof Sims

Residual melanins have been detected in multimillion-year-old animal body fossils; however, confident identification and characterization of these natural pigments remain challenging due to loss of chemical signatures during diagenesis. Here, we simulate this post-burial process through artificial maturation experiments using three synthetic and one natural eumelanin exposed to mild (100 °C/100 bar) and harsh (250 °C/200 bar) environmental conditions, followed by chemical analysis employing alkaline hydrogen peroxide oxidation (AHPO) and time-of-flight secondary ion mass spectrometry (ToF-SIMS). Our results show that AHPO is sensitive to changes in the melanin molecular structure already during mild heat and pressure treatment (resulting, e.g., in increased C-C cross-linking), whereas harsh maturation leads to extensive loss of eumelanin-specific chemical markers. In contrast, negative-ion ToF-SIMS spectra are considerably less affected by mild maturation conditions, and eumelanin-specific features remain even after harsh treatment. Detailed analysis of ToF-SIMS spectra acquired prior to experimental treatment revealed significant differences between the investigated eumelanins. However, systematic spectral changes upon maturation reduced these dissimilarities, indicating that intense heat and pressure treatment leads to the formation of a common, partially degraded, eumelanin molecular structure. Our findings elucidate the complementary nature of AHPO and ToF-SIMS during chemical characterization of eumelanin traces in fossilized organismal remains.

scholarly journals 3D chemical characterization of frozen hydrated hydrogels using ToF-SIMS with argon cluster sputter depth profiling

2016 ◽  
Vol 11 (2) ◽  
pp. 02A301 ◽  
Author(s):  
Michael Taylor ◽  
David Scurr ◽  
Matthias Lutolf ◽  
Lee Buttery ◽  
Mischa Zelzer ◽  
...  
Keyword(s):  
Depth Profiling ◽  
Chemical Characterization ◽  
Tof Sims

Surface and chemical characterization of ZnO:Eu3+/Yb3+ spin coated thin films using SEM-CL and TOF-SIMS

Vacuum ◽  
2018 ◽  
Vol 157 ◽  
pp. 376-383 ◽  
Author(s):  
A. Balakrishna ◽  
M.M. Duvenhage ◽  
H.C. Swart
Keyword(s):  
Thin Films ◽  
Chemical Characterization ◽  
Tof Sims

scholarly journals Chemical Composition and Micro Morphology of Golden Laminae in the Wall Painting “La Maestà” by Simone Martini: A Study by Optical Microscopy, XRD, FESEM-EDS and ToF-SIMS

2019 ◽  
Vol 9 (17) ◽  
pp. 3452 ◽  
Author(s):  
Andrea Atrei ◽  
Andrea Scala ◽  
Marco Giamello ◽  
Marianna Uva ◽  
Riccardo Maria Pulselli ◽  
...  
Keyword(s):  
Secondary Ion Mass Spectrometry ◽  
Chemical Characterization ◽  
High Sensitivity ◽  
Wall Painting ◽  
Tof Sims ◽  
Materials Used ◽  
Micro Morphology ◽  
Secondary Ion ◽  
Adhesive Materials

The chemical characterization of gilding decorations in works of art is fundamental in order to elucidate the techniques and materials used by the artists. In the present work we investigated by a combination of bulk and surface sensitive methods the composition and micro stratigraphy of the gilding laminae in the wall painting of the 14th century “La Maestà”, the masterpiece of Simone Martini. The aim of this study was to determine the composition of the gilding leaves and of the adhesive organic materials used to glue the metallic decorations to the wall painting. Due to the altered state of the samples we could not univocally identify the nature of the adhesive materials. Time of flight secondary ion mass spectrometry measurements showed that the gilding layers consisted of a gold leaf which was laid either directly on a preparation layer or on a tin lamina. The high sensitivity of ToF-SIMS and its spatial resolution allowed us to find traces of silver in the gold leaves and in the tin laminae which were not revealed by energy dispersive X-ray analysis.

scholarly journals Chemical Characterization of Wild Growing Origanum vulgare Populations in Montenegro

2018 ◽  
Vol 13 (10) ◽  
pp. 1934578X1801301 ◽  
Author(s):  
Danijela Stešević ◽  
Željko Jaćimović ◽  
Zlatko Šatović ◽  
Aida Šapčanin ◽  
Gordan Jančan ◽  
...  
Keyword(s):  
Essential Oil ◽  
Multivariate Analyses ◽  
Chemical Characterization ◽  
Origanum Vulgare ◽  
Linalyl Acetate ◽  
Sesquiterpene Hydrocarbons ◽  
Germacrene D ◽  
Positive Correlations ◽  
Oxygenated Monoterpene

In order to make chemical characterization of two Origanum vulgare L. subspecies in Montenegro, the essential oils of five wild growing populations were analyzed. Among 67 oil constituents, in O. vulgare subsp. hirtum dominant one was oxygenated monoterpene carvacrol (74.3%), while in O. vulgare subsp. vulgare prevailed sesquiterpene hydrocarbons: germacrene D (15.4–27.9%) and β-caryophyllene (7.7–14.6%), and among oxygenated monoterpenes: α- terpineol (4.8–17.8%), linalyl acetate (0.5–9.6%), linalool (3.0–8.8%), thymol (0.2–8.3), terpinene 4-ol (1.5–8.3%). Several of the main essential oil constituents appeared to be highly intercorrelated. Strong positive correlations (r > 0.70; P < 0.01) were observed between α-terpineol and linalyl acetate, α-terpineol and thymol, linalyl acetate and thymol, γ-terpenene and carvacrol, ( E)-β-ocimene and β-bisabolene, while strong negative correlations (r < −0.70; P < 0.01) were evidenced between γ-terpenene and β-caryophyllene, γ-terpenene and germacrene D, p-cymene and germacrene D. Multivariate analyses allowed the grouping of the populations into three distinct chemotypes. Population P5 (Origanum vulgare subsp. hirtum) was distinguished from O. vulgare subsp. vulgare populations by predominance of carvacrol, while within the typical subspecies the population P1 (Boljevići) separated from P2 (Radovče), P3 (Lipovo) and P4 (Grahovo) by high oil levels of α-terpineol, linalyl-acetate and thymol.

scholarly journals In-Situ TOF-SIMS and SFM Measurements Providing True 3D Chemical Characterization of Inorganic and Organic Nanostructures

2014 ◽  
Vol 20 (S3) ◽  
pp. 2086-2087 ◽  
Author(s):  
Ewald Niehuis ◽  
Rudolf Moellers ◽  
Felix Kollmer ◽  
Henrik Arlinghaus ◽  
Laetita Bernard ◽  
...  
Keyword(s):  
Chemical Characterization ◽  
Tof Sims ◽  
Organic Nanostructures ◽  
Inorganic And Organic
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