Absorption Spectra of Dye Solutions Measured Using a White Light Thermal Lens Spectrophotometer

Marcano, Arı́stides; Ojeda, Jorge J.; Melikechi, Noureddine

doi:10.1366/000370206777412077

Cited by 17 publications

(15 citation statements)

References 23 publications

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“…In addition, photothermal spectroscopy has been carried out using arc lamps, 7,8 but only for the determination of the absorption spectra of highly absorbing samples due to the weak TL effect generated by these excitation light sources. 7,8 Although the TLS technique found a wide range of important applications, its applicability is still hindered by the high cost and low compactness of the excitation sources. Additionally, tunability and high sensitivity is needed for determining the absorption spectra of semi-transparent samples such as ethanol and water.…”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6] So far, these measurements have been performed by the use of high-power tunable laser sources and relatively expensive and experimentally complex setups. In addition, photothermal spectroscopy has been carried out using arc lamps, 7,8 but only for the determination of the absorption spectra of highly absorbing samples due to the weak TL effect generated by these excitation light sources. 7,8 Although the TLS technique found a wide range of important applications, its applicability is still hindered by the high cost and low compactness of the excitation sources.…”

Section: Introductionmentioning

confidence: 99%

“…For this reason, a highly sensitive integrated cavity method has been used for spectrometric characterization of different solvents in order to distinguish light scattering from absorbance. 11 This requirement of high sensitivity and reduced sensitivity to the effects of light scattering, is also fulfilled by TLS, 7,8 which has been successfully used for recording the absorption spectrum of pure water, [12][13][14] as well as for identification of O-H overtone absorption of methanol. 15 In the visible region, the absorption coefficients of water and organic solvents are very small (10 À4 cm À1 ) and the determination of the absorption spectrum is an experimental challenge.…”

Section: Introductionmentioning

confidence: 99%

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Absorption Spectra of Ethanol and Water Using a Photothermal Lens Spectrophotometer

et al. 2018

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In this work we report on the absorption spectra of ethanol and water in the region 430-700 nm using a homemade halogen lamp-based photothermal lens spectrophotometer with a multipass probe-beam configuration. The spectra also include well resolved, higher absorption overtones. The instrument achieves high sensitivity due to multiple reflections within the optical cavity containing the sample. Finally, an Arduino board was used for collecting and digitizing the signal, thus enabling a more compact device.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Absorption Spectra of Ethanol and Water Using a Photothermal Lens Spectrophotometer

et al. 2018

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“…The apparatus has been found to work with cells designed to contain sample volumes from 6 mL down to 24 nL. Marcano O. et al (2006) described a white light TL setup for measuring the absorption spectra of dye solutions. This setup used a xenon lamp as the excitation source with a spectral resolution of 10 nm from 400 to 700 nm.…”

Section: Improvements Of Specificitymentioning

confidence: 99%

Progress in Thermal Lens Spectrometry and Its Applications in Microscale Analytical Devices

Liu

Franko

2014

Critical Reviews in Analytical Chemistry

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Development of thermal lens spectrometry (TLS) as a micro space-compatible photothermal technique and its applications for analysis of different chemical compounds in micro space and particularly in microfluidic systems are reviewed. Theoretical treatment of TLS in micro space has evolved from simply following conventional theory and predictions in macro space to employing a more accurate theory where impacts of the excitation source (Gaussian laser, top-hat incoherent light source, beam divergence, power density), detection scheme (probe beam waist, mode-mismatching degree), sample flow, and sample cell (top/bottom layers, side wall) on the TL signal are included. Noise sources (light sources, sample status, detector) in TLS systems have been analyzed, and optimum pinhole-to-beam radius ratio is suggested for the maximum signal-to-noise ratio. With different excitation light sources from ultraviolet, to visible, to near-infrared regions and coupled with microfluidic devices, these TLS instruments with good temporal and spatial resolution have found many applications for highly sensitive and/or high-throughput detection of chemical or biochemical analytes, for cell imaging or single particle/molecule detection, and for characterization of molecular diffusion in single- or two-phase systems. Prospects and challenges of TLS for future applications in microchemical analysis are discussed.

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“…Reports on using laser tunable systems and arc lamps to perform PTL spectroscopy have been published elsewhere. [25][26][27][28] In combination with traditional transmission spectroscopy, PTL spectroscopy provides the fluorescence spectra of luminescent samples and scattering spectra of turbid samples. In this regard, PTL can be considered a new kind of spectroscopic method to study samples that exhibit a complex behavior upon interaction with light.…”

Section: Introductionmentioning

confidence: 99%

Photothermal Determination of Absorption and Scattering Spectra of Silver Nanoparticles

Olaizola

2017

Appl Spectrosc

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This work reports on photothermal lens spectra of silver nanoparticles of different dimensions in the spectral region of 370-730 nm performed using an arc-lamp-based photothermal spectrophotometer. We show that the photothermal and extinction cross-section spectra of the samples are similar for nanoparticles of reduced dimensions where scattering effects are small. The results differ substantially for nanoparticles of a diameter larger than 30 nm for which scattering becomes relevant. We demonstrate that the photothermal spectrum corresponds to the absorption component of the particle's extinction. Photothermal spectra show a clear picture of the plasmonic peaks of the nanoparticle even in the presence of high scattering. By subtracting the photothermal component from the total extinction, we extract the scattering cross-section spectra of the nanoparticles. The technique allows determination of the absorption and scattering components of the extinction providing a better understanding of the particle's optical properties. The results agree well with the Mie approximation, which is valid for a single spherical nanoparticle. We discuss and demonstrate the application of the method to characterize particles of arbitrary shape and dimensions.

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Absorption Spectra of Dye Solutions Measured Using a White Light Thermal Lens Spectrophotometer

Cited by 17 publications

References 23 publications

Absorption Spectra of Ethanol and Water Using a Photothermal Lens Spectrophotometer

Absorption Spectra of Ethanol and Water Using a Photothermal Lens Spectrophotometer

Progress in Thermal Lens Spectrometry and Its Applications in Microscale Analytical Devices

Photothermal Determination of Absorption and Scattering Spectra of Silver Nanoparticles

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