Vacuum ft ir vertex 70 5 spectrometer

FT-IR and SEIRA spectra were recorded for a dried samples of CuNPs-Fe without and with Thr. The FT-IR spectrum were carried out for a dried solution of a 10⁻¹-M Thr droplet on the calcium fluoride optical window. FT-IR and SEIRA spectra were recorded employing a Vacuum FT-IR VERTEX 70 V spectrometer (Bruker, Ettlingen, Germany) combined with the HYPERION 3000 IR microscope (Bruker Optics, Germany). The microscope was equipped with a liquid-nitrogen-cooled MCT (Mercury–Cadmium–Telluride) detector and a 15× magnification objective. The spectra were measured in reflectance mode covering the spectral range from 4000 cm⁻¹ to 800 cm⁻¹ (256 number of scans and 4 cm⁻¹, spectral resolution). The spectra from the SEIRA were almost identical, except for small changes in the inten sities of some of the bands. In order to confirm the reproducibility of the observed phenomenon, the SEIRA spectra were recorded from three different areas.

Qualitative and quantitative information of the crystal structure of the analyzed materials was obtained using Fourier-transform infrared spectroscopy. Based on the measured spectra and specific values of the peaks, it is possible to determine the percentage of crystalline $$\mathsf{\beta }$$ -phase (especially in the case of PVDF material), the presence of which causes a piezoelectric effect. The piezoelectric properties can also be partly caused by the $$\mathsf{\gamma }$$ -phase.
The spectrum was measured on a Vacuum FT-IR Vertex70v spectrometer (Bruker, Billerica, MA, USA), and the values of the intensity of the absorbed energy depending on the wavelength of the infrared radiation were recorded in the spectra graphs. The absorbance spectrum was measured with a wavelength resolution of $$0.5$$ cm⁻¹. Background noise was subtracted from the individual curves for more accurate analysis data.
There is a characteristic wavelength band for each of the $$\mathsf{\alpha }$$ , $$\mathsf{\beta }$$ , and $$\mathsf{\gamma }$$ -phases of PVDF (Table 5). The spectra of the PA6 materials and the PVDF/PA6 mix were measured for comparison with the pure PVDF material. The PA6 material crystallizes only in the $$\mathsf{\alpha }$$ and $$\mathsf{\gamma }$$ -phases, so it does not form the $$\mathsf{\beta }$$ -phase.