IR measurements were carried out in the transmission mode. Aliquots of the sample particles were pressed in self-supporting pellets and placed in a quartz cell equipped with CaF2 windows. The FTIR spectra were recorded with a Bruker INVENIO R FTIR spectrometer (liquid nitrogen cooled MCT detector; resolution, 4 cm−1) by averaging 128 scans to attain a good signal-to-noise ratio. The cell was attached to a conventional vacuum line (residual pressure ≤ 1 × 10−4 mbar) allowing adsorption–desorption experiments to be carried out in situ. As detailed previously [22 (link)], the silica samples underwent an hydrogen/deuterium (H/D) isotopic exchange by adsorption/desorption of D2O (99.90% D) to convert surface silanols (☰SiOH) in the ☰SiOD form.
Invenio r ftir spectrometer
Manufactured by Bruker
Sourced in Germany
The INVENIO R FTIR spectrometer is a Fourier Transform Infrared Spectrometer designed for analytical applications. It provides high-resolution infrared spectroscopy capabilities for various materials analysis tasks.
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Lab products found in correlation
4 protocols using invenio r ftir spectrometer
1
In Situ FTIR Spectroscopy of Silica Samples
2
Electrochemical ATR-SEIRAS of Oxygen Reactions
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The electrochemical ATR-SEIRAS measurements were carried out on a BRUKER INVENIO-R FTIR spectrometer equipped with a mercury cadmium telluride (MCT) detector cooled with liquid nitrogen in O2-saturated aqueous solutions of 0.1 M KOH and 0.1 M HClO4. Three-electrode configuration was utilized for electrochemical control, in which the Hg/HgO electrode and saturated calomel electrode (SCE) were used as the reference electrodes in alkaline and acid electrolytes, respectively; a Pt foil was used as the counter electrode. Unpolarized infrared radiation from an Elema source was focused at the interface at the incident angle of 60°, and the reflected radiation was detected. Real-time spectra with a resolution of 8 cm−1 were recorded during stepping the working electrode potential, and each spectrum was integrated by 44 scans. All spectra are shown in the absorbance units −log(R/R0), where R and R0 represent the reflected intensity of the sample and reference spectrum, respectively. Reference spectra were taken at 1.1 V vs RHE.
3
FTIR Spectroscopy of Samples
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FTIR spectroscopy of the samples was collected using a Germany Bruker INVENIO-R FT-IR spectrometer. To gain an acceptable signal-to-noise ratio, 128 scans with a resolution of 4 cm−1 have been accumulated. ATR spectrum uses diamond reflection crystal.
4
FTIR Spectroscopy of Carbon Quantum Dot Hybrids
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The FTIR spectrum of CQD was recorded using a Bruker Invenio R FTIR spectrometer (Bruker, Mannheim, Germany) using an attenuated total reflection (ATR) accessory with a diamond crystal. The resulting spectrum was obtained by averaging 20 scans with a spectral resolution of 4 cm–1.
The FTIR spectra of hybrids were obtained at Nicolet8700 (Thermo Fisher Scientific; Waltham, MA, USA) using an ATR accessory with a diamond crystal. To obtain the FTIR spectra, the spectrometer configuration with a XT-KBr beam splitter and liquid nitrogen cooled mercury cadmium telluride (MCT-A) detector was used. For the solutions under investigation, the spectra were obtained in the region 650–4000 cm−1 with a resolution of 4 cm−1. In the obtained spectra, the Blackman–Harris apodization function was used and the Mertz phase correction was applied. Due to the low concentration of the investigated substances, the subtraction of the contribution of CQD in isopropanol (seeFigure S1 ) was performed using Origin 9 (OriginLab Co., Northampton, MA, USA) software. Such mathematical procedures reveal any possible interaction between components of hybrids.
The FTIR spectra of hybrids were obtained at Nicolet8700 (Thermo Fisher Scientific; Waltham, MA, USA) using an ATR accessory with a diamond crystal. To obtain the FTIR spectra, the spectrometer configuration with a XT-KBr beam splitter and liquid nitrogen cooled mercury cadmium telluride (MCT-A) detector was used. For the solutions under investigation, the spectra were obtained in the region 650–4000 cm−1 with a resolution of 4 cm−1. In the obtained spectra, the Blackman–Harris apodization function was used and the Mertz phase correction was applied. Due to the low concentration of the investigated substances, the subtraction of the contribution of CQD in isopropanol (see
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