Raman and X-Ray Fluorescence to Identify Colors of the German Hyperinflation Stamps of the 1923 Collection

Gómez-Jeria, Juan S.; Campos‐Vallette, Marcelo; Carrasco-Flores, E.A.; Gutiérrez, Sebastián

doi:10.4067/s0717-97072019000404622

Cited by 3 publications

(1 citation statement)

References 17 publications

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“…The development of peaks at 217 and 276 cm –1 on the PB–CS-coated LIG, as shown in Figure B, is ascribed to FeCNFe vibrations and indicates the presence of Prussian blue. − However, the assignment of low-frequency bands (<300 cm –1 ) has rarely been reported in the literature. The peaks at 2099 and 2150 cm –1 on the PB–CS-coated electrodes are attributed to asymmetric and symmetric stretch vibrations of Fe II –CN–Fe III , respectively (Figure S3).…”

Section: Resultsmentioning

confidence: 96%

Stable Chitosan and Prussian Blue-Coated Laser-Induced Graphene Skin Sensor for the Electrochemical Detection of Hydrogen Peroxide in Sweat

Barber

Davis

Papakonstantinou

2023

ACS Appl. Nano Mater.

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Developing a noninvasive skin peroxide monitoring technology is highly desirable for managing a number of metabolic disorders associated with diabetes, pulmonary diseases, or other health conditions. To date, the majority of studies on peroxide detection have been conducted on simulated sweat and high pH conditions, which are beyond the physiological range, in order to provide an enhanced response.Here, a skin-worn amperometric sensor, based on laser-induced graphene (LIG), surface-engineered with a Prussian blue (PB)−chitosan (CS) network was fabricated by one-step electrodeposition for the stable and sensitive detection of H 2 O 2 in human eccrine perspiration. The hybrid (PB−CS) network and laser-written electrode configuration were optimized through systematic investigation of electrodeposition parameters and concurrent feedback from electrochemical and morphological characterization at each fabrication step. Different from the multitude of carbonbased electrodes functionalized with metallic nanoparticles reported in the literature, the sensor was operated at a low potential of −0.036 V vs Ag/AgCl in unmodified human eccrine perspiration. The low working potential ensured that the sensor is highly specific, immune to the current from oxygen reduction or common interfering species, whereas the inclusion of CS in the hybrid coating afforded a highly stable performance over a period of 14 days. The sensor was able to monitor H 2 O 2 over the linear range of 10−1000 μM with a low detection limit of 6.31 μM and achieved a recovery of 98.73% (% RSD 0.86) in human eccrine perspiration. This facile biosensor based on directly laser-written electrodes coupled with the one-step PB−CS fabrication strategy has the potential to form the basis for the development of oxidase enzyme-based sensors in sweat.

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Section: Resultsmentioning

confidence: 96%

Stable Chitosan and Prussian Blue-Coated Laser-Induced Graphene Skin Sensor for the Electrochemical Detection of Hydrogen Peroxide in Sweat

Barber

Davis

Papakonstantinou

2023

ACS Appl. Nano Mater.

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The chemistry behind the first Portuguese postage stamps (1853–1894). A non-destructive analytical and chemometric analysis of pigments, fillers and binders

et al. 2022

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Beyond Artists’ Colors: A Spectral Reference Database for the Identification of β-Naphthol and Triarylcarbonium Colorants by MeV SIMS

Raicu,

Krmpotić,

Siketić

et al. 2024

ACS Omega

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β-Naphthol and triarylcarbonium colorants were often used by modern and contemporary artists in materials such as inks and paints. Their poor stability and ability to fade upon exposure to light make their identification in artworks crucial for planning exhibitions and preventive conservation. Secondary ion mass spectrometry with MeV primary ions (MeV SIMS) is necessary when analyzing synthetic organic colorants (SOCs) with similar molecular structures due to its advantages in high sensitivity and soft ionization, which causes a low fragmentation of organic molecules. In this work, we applied MeV SIMS with 5 MeV Si 4+ to identify selected β-naphthol and triarylcarbonium colorants from the 19th/20th century Materials Collection kept at the Academy of Fine Arts Vienna. The collection contains SOCs from renowned companies, such as I.G. Farben and I.C.I., and serves as a unique source of reference materials in the analysis of artworks. Previous research on these colorants with X-ray fluorescence analysis (XRF), micro-Raman, and Fourier transform infrared (FTIR) spectroscopies failed in the case of colorant mixtures. Similar spectral features of the SOCs within one chemical class and their low concentrations in mixtures did not lead to their identification using these techniques. MeV SIMS detected molecular ions or protonated molecules in the positive-ion mode. In the negative-ion mode, the functional groups (NO 2 – and SO 3 – ) of β-naphthol lakes/pigments and heteropolyacid species (WO 3 – and MoO 3 – ) characteristic of triarylcarbonium toners were determined. The results demonstrate that MeV SIMS is highly effective for identifying β-naphthol and triarylcarbonium colorants in mixtures and distinguishing between pigments, toners, lakes, and dyes.

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Raman and X-Ray Fluorescence to Identify Colors of the German Hyperinflation Stamps of the 1923 Collection

Cited by 3 publications

References 17 publications

Stable Chitosan and Prussian Blue-Coated Laser-Induced Graphene Skin Sensor for the Electrochemical Detection of Hydrogen Peroxide in Sweat

Stable Chitosan and Prussian Blue-Coated Laser-Induced Graphene Skin Sensor for the Electrochemical Detection of Hydrogen Peroxide in Sweat

The chemistry behind the first Portuguese postage stamps (1853–1894). A non-destructive analytical and chemometric analysis of pigments, fillers and binders

Beyond Artists’ Colors: A Spectral Reference Database for the Identification of β-Naphthol and Triarylcarbonium Colorants by MeV SIMS

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