Dxr laser raman spectrometer

In this study, the DXR laser Raman spectrometer (Thermo Fisher, Waltham, MA, USA) was used to collect the Raman spectra of the peanut oil samples, and the OMNIC software (Thermo Fisher, Waltham, MA, USA) was used to record the spectral data of the peanut oil samples. Before spectral acquisition, the instrument parameters were set as follows: The wavelength of the laser light source was 532 nm; the laser power was 10 mW; the focal length of the eyepiece was 10X; the integration time was 10 s, the spectral scanning range was 100–3300 cm⁻¹, and the ambient temperature was controlled at about 20 °C.
During the spectral acquisition process, 0.5 μL of peanut oil sample was drawn onto the silicon wafer by a pipette. Then, the silicon wafer was placed on the Raman spectrometer experimental platform for spectral collection of the peanut oil sample. The coarse adjustment knob of the Raman spectrometer was slowly adjusted to focus the objective on the sample. The OMNIC software was used to observe spectral imaging of the sample on the bench. Then, we fine-tuned the knob and performed the final spectral scan when the spectrum was stable and the noise was small. Since the spectral peak information in the range of 800–1800 cm⁻¹ was rich and clear, the spectra in this wavelength range were studied as the original Raman spectra of peanut oil samples, as shown in Figure 2.

All of the starting materials employed were purchased from commercial sources and used as received without further purification. Elemental analyses for C, H and N were determined with a Perkin-Elmer 240. Fourier transform infrared (FT-IR) spectra were measured as KBr pellets on a Nicolet FT-170SX spectrometer in the range of 400 cm⁻¹–4000 cm⁻¹. Raman spectra were measured as on a ThermoFisher DXR laser Raman spectrometer. Thermogravimetric analysis (TGA) experiments were carried out on an integrated thermal STA 449C analyzer heated from room temperature to 800 °C under N₂ atmosphere. Powder X-ray diffraction (PXRD) patterns were collected on a Rigaku D/max2500VB3+/PC diffractometer equipped with Cu-Kα radiation (λ = 1.5406 Å). The morphology of Pd@Y-DDQ was investigated by High Resolution Transmission Electron Microscope JEM-2100 (HRTEM). The UV-Vis spectra were measured on UV-2450 spectrophotometer. ¹H NMR spectra were recorded on Bruker AVANCE 500 MHz spectrometer at room temperature in CDCl₃. ICP analysis was carried on Varian VISTA- MPX instrument. Details of the ligand synthesis were reported in the literature23 (link).