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31.
32.
Growth, morphology and stability of Au in contact with the Bi[sub]2Se[sub]3(0 0 0 1) surface
Mattia Fanetti, Iuliia Mikulska, Katja Ferfolja, Paolo Moras, P. M. Sheverdyaeva, M. Panighel, A. Lodi-Rizzini, I. Píš, S. Nappini, Matjaž Valant, Sandra Gardonio, 2018, original scientific article

Found in: ključnih besedah
Summary of found: ...growth mode, electronic properties, chemical properties, photoemission spectroscopy, microscopy...
Keywords: metal contact, topological insulator contact, growth mode, electronic properties, chemical properties, photoemission spectroscopy, microscopy
Published: 05.12.2018; Views: 1710; Downloads: 0
.pdf Fulltext (8,13 MB)

33.
First principles vibrational spectra of tetrahedrally-bonded glasses: sio2, geo2 and gese2
Luigi Giacomazzi, 2007, doctoral dissertation

Found in: ključnih besedah
Summary of found: ...Silica, Germania, Chalcogenide Glasses, Vibrational Spectra, Raman Spectroscopy, Infrared, First-principles,...
Keywords: Silica, Germania, Chalcogenide Glasses, Vibrational Spectra, Raman Spectroscopy, Infrared, First-principles
Published: 31.01.2019; Views: 2007; Downloads: 0
.pdf Fulltext (2,03 MB)

34.
Determination of Dissolved Iron Redox Species in Freshwater Sediment using DGT Technique Coupled to BDS
Yue Gao, Arne Bratkič, Dorota Korte, Aleksander Kravos, Hanna Budasheva, Mladen Franko, 2019, original scientific article

Abstract: In this work we have developed a novel method for determination of iron redox species by the use of diffusive gradients in thin-film (DGT) technique coupled to photothermal beam deflection spectroscopy (BDS). The combination of both methods achieved low limit of detection (LOD) of 0.14 μM for Fe (II) ions. The total Fe concentration determined in the Vrtojbica river sediment (Slovenia, Rožna Dolina, 5000 Nova Gorica) was 49.3 μgL–1. The Fe (II) and Fe (III) concentra- tion amounted to 12.8 μgL–1 and 39.9 μgL–1, respectively. Such an approach opens new opportunities for monitoring the content of iron species in natural waters and sediments and provides highly sensitive chemical analysis and an accurate qualitative and quantitative characteristic of the materials under study.
Found in: ključnih besedah
Summary of found: ...(DGT) technique coupled to photothermal beam deflection spectroscopy (BDS). The combination of both methods achieved...
Keywords: Beam deflection spectroscopy, diffusive gradients in thin-film technique, iron redox species, photothermal techniques, sediment
Published: 26.02.2019; Views: 1830; Downloads: 71
.pdf Fulltext (452,58 KB)

35.
Photothermal lens technique: a comparison between conventional and self-mixing schemes
John Fredy Barrera Ramírez, Dorota Korte, Jose Juan Suárez-Vargas, Jehan Akbar, Evelio E. Ramírez-Miquet, Fatima Matroodi, Imrana Ashraf, Humberto Cabrera, Hanna Budasheva, Joseph J. Niemela, 2019, original scientific article

Abstract: This work focuses on assessing the analytical capabilities of a new photothermal lens method based on the self-mixing effect to reliably measure metallic traces in water-ethanol solutions. We compare it with the conventional thermal lens scheme, considering the low detection limit and versatility. A theoretical model is presented to describe the laser power variations as a function of the photothermal parameters of the analyzed sample. The experimental results demonstrate that the laser intensity variations, induced by the external optical feedback, are governed by the photothermal lens effect. Measurements of Fe(II)-1,10-phenanthroline in water–ethanol solutions show a favourable correspondence and agreement with the theory. The low detection limits obtained by the two analytic techniques also agree very well. Nevertheless, our instrument presents advantages regarding compactness and simplicity, suggesting that this platform could be potentially useful as a robust analytical tool for metallic trace detection. In addition, calibration of the method is performed by measuring the so-called self-mixing constant.
Found in: ključnih besedah
Summary of found: ...thermal lens, photothermal spectroscopy, self-mixing effect, trace detection...
Keywords: thermal lens, photothermal spectroscopy, self-mixing effect, trace detection
Published: 05.04.2019; Views: 1633; Downloads: 0
.pdf Fulltext (715,09 KB)

36.
Trace detection of C2H2 in ambient air using continuous wave cavity ring-down spectroscopy combined with sample pre-concentration
Orr-Ewing Andrew, Damien Martin, Iain White, Roberto Grilli, Ruth Lindley, Manik Pradhan, 2008, original scientific article

Abstract: Continuous wave cavity ring-down spectroscopy (cw-CRDS) coupled with sample pre-concentration has been used to measure acetylene (C2H2) mixing ratios in ambient air. Measurements were made in the near-infrared region (λ∼1535.393 nm), using the P(17) rotational line of the (ν1+ν3) vibrational combination band, a region free from interference by overlapping spectral absorption features of other air constituents. The spectrometer is shown to be capable of fast, quantitative and precise C2H2 mixing ratio determinations without the need for gas chromatographic (GC) separation. The current detection limit of the spectrometer following sample pre-concentration is estimated to be 35 parts per trillion by volume (pptv), which is sufficient for direct atmospheric detection of C2H2 at concentrations typical of both urban and rural environments. The CRDS apparatus performance was compared with an instrument using GC separation and flame ionization detection (GC-FID); both techniques were used to analyze air samples collected within and outside the laboratory. These measurements were shown to be in quantitative agreement. The indoor air sample was found to contain C2H2 at a mixing ratio of 3.87±0.22 ppbv (3.90±0.23 ppbv by GC-FID), and the C2H2 fractions in the outside air samples collected on two separate days from urban locations were 1.83±0.20 and 0.69±0.14 ppbv (1.18±0.09 and 0.60±0.04 ppbv by GC-FID). The discrepancy in the first outdoor air sample is attributed to degradation over a 2-month interval between the cw-CRDS and GC-FID analyses.
Found in: ključnih besedah
Keywords: Rotational Line, Cavity Enhance Absorption Spectroscopy, Adsorbent Trap, Trace Atmospheric Constituent, CRDS Instrument
Published: 15.07.2019; Views: 1474; Downloads: 0
.pdf Fulltext (363,50 KB)

37.
Photothermal spectrophotometer for meaurements of low absorption in liquid samples
J. Akbar, Humberto Cabrera, Dorota Korte, 2019, published scientific conference contribution abstract

Found in: ključnih besedah
Summary of found: ...photothermal spectroscopy techniques, halogen lamps, TL signal...
Keywords: photothermal spectroscopy techniques, halogen lamps, TL signal
Published: 16.07.2019; Views: 1459; Downloads: 0
.pdf Fulltext (324,00 KB)

38.
Nanobody Engineering Provides Diagnostic Reagents For The Quantification Of The Toxic Microalgae Alexandrium minutum
Robert Alvin Bernedo-Navarro, Sandra Oloketuyi, Giulio Bernardinelli, Eda Mehmeti, Kurt Kalcher, Ario de Marco, 2019, published scientific conference contribution abstract

Found in: ključnih besedah
Summary of found: ...Nanobodies, DNAzyme, electrochemical impedance spectroscopy, toxic microalgae...
Keywords: Nanobodies, DNAzyme, electrochemical impedance spectroscopy, toxic microalgae
Published: 09.09.2019; Views: 1653; Downloads: 0
.pdf Fulltext (3,13 MB)

39.
Determination of Iron in Environmental Water Samples by FIA-TLS
Mladen Franko, Arne Bratkič, Dorota Korte, Hanna Budasheva, Leja Goljat, Gaja Tomšič, 2019, original scientific article

Abstract: The determination of low concentration of iron in natural waters can be difficult due to the complexity of natural water, but primarily because it requires preconcentration of the sample with solvent extraction. In this work we report on results of thermal lens spectrometry (TLS) coupled to flow injection analysis (FIA) as a highly sensitive FIA-TLS method of iron detection. The concentration of iron redox species was determined using 1,10-phenanthroline (PHN), that forms stable complexes with Fe(II) ions which are characterized by an absorption maximum at 508 nm. The TLS system using a 633 nm probe laser and 530 nm pump laser beam was exploited for on-line detection in flow injection analysis, where a PHN solution was used as the carrier solution for FIA. The concentration of the complexing agent affects the quality of the TLS signal, and the optimal concentration was found at 1 mM PHN. The achieved limits of detection (LODs) for Fe(II) and total iron were 33 nM for Fe(II) and 21 nM for total iron concentration. The method was further validated by determining the linear concentration range, specificity in terms of analytical yield and by determining concentration of iron in a water sample from a local water stream.
Found in: ključnih besedah
Keywords: Flow injection analysis, iron concentration, thermal lens spectroscopy
Published: 18.12.2019; Views: 1313; Downloads: 55
.pdf Fulltext (690,39 KB)

40.
Characterization of organic semiconductor thin layers by transient photocurrent spectroscopy
Nadiia Pastukhova, Egon Pavlica, Gvido Bratina, 2019, published scientific conference contribution abstract

Found in: ključnih besedah
Keywords: organic semiconductors, thin layers, spectroscopy
Published: 10.02.2020; Views: 1253; Downloads: 0
.pdf Fulltext (865,49 KB)

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