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Title:Trace Detection and Photothermal Spectral Characterization by a Tuneable Thermal Lens Spectrometer with White-Light Excitation
Authors:ID Cabrera, Humberto, ICTP (Author)
ID Korte, Dorota, UNG-LELS (Author)
ID Franko, Mladen, UNG-LELS (Author), et al.
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Language:English
Work type:Not categorized
Typology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:In the thermal lens experimental set-up we replaced the commonly employed pump laser by a halogen lamp, combined with an interference lter, providing a tuneable, nearly monochromatic pump source over the range of wavelengths 430–710 nm. Counter-propagating pump and probe beams are used and a 1 mm path-length sam- ple cell together with the interference lter makes an optical cavity, providing ampli cation of the thermal lens signal, which leads to enhancement of the measurement sensitivity, and enables detection of absorbances on the order of 5×10− 6. Ampli ed thermal lens signal allows us to replace the typical lock-in ampli er and digital os- cilloscope with a silicon photodetector, Arduino board, and a personal computer, offering the possibility for a compact, robust and portable device, useful for in- eld absorption measurements in low concentration or weakly absorbing species. The use of a white light source for optical pumping, an interference lter for wavelength selection and direct diagnostic of the thermal lens signal increase the versatility of the instrument and simpli- es substantially the experimental setup. Determination of Fe(II) concentrations at parts per billion levels was performed by the described white-light thermal lens spectrophotometer and the absorption spectrum for 50μg/ L Fe(II)-1,10-phenanthroline was well reproduced with an average measurement precision of 4%. The obtained limits of detection and quantitation of Fe(II) determination at 510nm are 3μgL− 1 and 11μgL− 1, respectively. The calibration curve was linear in the concentration range of LOQ-500μgL− 1 with reproducibility between 2% and 6%, con rming that this instrument provides good spectrometric capabilities such as high sensitivity, tune- ability and good reproducibility. In addition, the versatility of the instrument was demonstrated by recording the photothermal spectrum of gold nanostructured material and determination of excitation wavelength with most ef cient optical to thermal energy conversion, which differs considerably (cca 100 nm) from the absorption maximum of the investigated sample.
Keywords:thermal lens spectrometry, Fe(II) determination, photothermal technique, multi-wavelength excitation
Publication version:Version of Record
Year of publishing:2018
Number of pages:7
Numbering:0
PID:20.500.12556/RUNG-3840-69172996-ba4a-a86b-6aaf-8d04ea44bcb7 New window
COBISS.SI-ID:5110011 New window
DOI:https://doi.org/10.1016/j.talanta.2018.02.073 New window
NUK URN:URN:SI:UNG:REP:QGZBGI0C
Publication date in RUNG:21.02.2018
Views:5779
Downloads:0
Metadata:XML DC-XML DC-RDF
:
CABRERA, Humberto, KORTE, Dorota and FRANKO, Mladen, 2018, Trace Detection and Photothermal Spectral Characterization by a Tuneable Thermal Lens Spectrometer with White-Light Excitation. Talanta [online]. 2018. Vol. 0. [Accessed 30 March 2025]. DOI https://doi.org/10.1016/j.talanta.2018.02.073. Retrieved from: https://repozitorij.ung.si/IzpisGradiva.php?lang=eng&id=3840
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Record is a part of a journal

Title:Talanta
Shortened title:Talanta
Publisher:Elsevier
Year of publishing:2018
ISSN:0039-9140

Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:20.02.2018

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