Terahertz spectroscopy of polar solute molecules in non-polar solvents

Oka, Asako; Tominaga, Kazuhiro

doi:10.1016/j.jnoncrysol.2006.03.122

Cited by 14 publications

(11 citation statements)

References 7 publications

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“…Surfactants (for example, sodium deoxycholate, sodium cholate, Triton X-100) and solvents can have absorption coefficients larger than a few cm −1 in the THz region39, and may adversely affect the absorption of THz radiation in GSAs40. Thus, surfactant-free and low boiling point (<80 °C) printable inks must be engineered in order to enable low-temperature (<100 °C) solvent removal.…”

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“…To date, water-based inks prepared by LPE of graphite require post-processing to remove the surfactant/polymer 37 , while the high boiling point of the resulting inks in n-methylpyrrolidone, n-dimethylformamide and ortho-dichlorobenzene hinders solvent removal by evaporation after the coating/printing process 38 . Surfactants (for example, sodium deoxycholate, sodium cholate, Triton X-100) and solvents can have absorption coefficients larger than a few cm −1 in the THz region 39 , and may adversely affect the absorption of THz radiation in GSAs 40 . Thus, surfactant-free and low boiling point (<80 °C) printable inks must be engineered in order to enable low-temperature (<100 °C) solvent removal.…”

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confidence: 99%

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Terahertz saturable absorbers from liquid phase exfoliation of graphite

et al. 2017

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Saturable absorbers (SA) operating at terahertz (THz) frequencies can open new frontiers in the development of passively mode-locked THz micro-sources. Here we report the fabrication of THz SAs by transfer coating and inkjet printing single and few-layer graphene films prepared by liquid phase exfoliation of graphite. Open-aperture z-scan measurements with a 3.5 THz quantum cascade laser show a transparency modulation ∼80%, almost one order of magnitude larger than that reported to date at THz frequencies. Fourier-transform infrared spectroscopy provides evidence of intraband-controlled absorption bleaching. These results pave the way to the integration of graphene-based SA with electrically pumped THz semiconductor micro-sources, with prospects for applications where excitation of specific transitions on short time scales is essential, such as time-of-flight tomography, coherent manipulation of quantum systems, time-resolved spectroscopy of gases, complex molecules and cold samples and ultra-high speed communications, providing unprecedented compactness and resolution.

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Terahertz saturable absorbers from liquid phase exfoliation of graphite

et al. 2017

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“…We have studied low-frequency spectra of solutions of non-polar solvents to investigate interactions between solute and non-polar solvents [9][10][11]. A polar solute molecule we chose is nitrobenzene (NB) and non-polar solvents are hexane, octane, and decane.…”

Section: Solutions; Polar Solute Molecule In Non-polar Solventmentioning

confidence: 99%

THz-TDS studies on proteins and molecular complexes in solutions

Tominaga

Kawaguchi

Shibata

et al. 2009

2009 34th International Conference on Infrared, Millimeter, and Terahertz Waves

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We have investigated low-frequency spectra of various systems in condensed phases by terahertz time-domain spectroscopy (THz-TDS). Low-frequency dynamics of bacteriorhodopsin is studied by changing the amount of hydration and temperature. A hydrated sample shows a sudden change in the THz spectrum at -40ºC, although a dried sample does not show any change during the temperature change. For the solute/solvent systems we measured solutions of polar solutes in non-polar solvents to extract microscopic information on the interaction between the solute and solvent.

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“…For recent years, we have applied THz-TDS to investigate low-frequency spectra of solute molecules in solution in the THz frequency region [1][2][3][4][5]. The solute contributions to the observed spectra are obtained by subtracting the solvent contribution from the solution spectra.…”

Section: Introductionmentioning

confidence: 99%

Low-frequency spectra in hydrophobic environment studied by terahertz time-domain spectroscopy

Ishihara

Iguchi

Tayama

et al. 2011

2011 International Conference on Infrared, Millimeter, and Terahertz Waves

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Low-frequency spectrum of hydration water molecules around the hydrophobic probe in an aqueous solution has been obtained by using tetraalkylammonium cation as a probe and terahertz time-domain spectroscopy. The obtained spectrum of hydration water has intensity larger than that of ice and smaller than that of bulk water. This suggests that dynamics of hydration water molecules are partially restricted compared to those of bulk water.

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Terahertz spectroscopy of polar solute molecules in non-polar solvents

Cited by 14 publications

References 7 publications

Terahertz saturable absorbers from liquid phase exfoliation of graphite

Terahertz saturable absorbers from liquid phase exfoliation of graphite

THz-TDS studies on proteins and molecular complexes in solutions

Low-frequency spectra in hydrophobic environment studied by terahertz time-domain spectroscopy

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