X-ray diffraction patterns (XRD) were obtained using a D2 PHASER diffractometer (from Bruker) with a Cu source (Kα1 radiation, λ = 1.5406 Å) operating at 10 mA and 30 kV in a Bragg–Brentano configuration. The transmittance spectra for the films were collected using a Cary-5000 spectrometer from Agilent. Raman scattering spectroscopy was performed using a DXR Micro-Raman spectrometer from Thermo Fisher Scientific with an excitation laser of 455 nm at 7 mW of power by focusing the laser radiation through a 50X microscope objective lens at 0.2 mW using 5 s as the integration time and 3 scans. Films were examined with a Zeiss field emission SEM (AURIGA model) operating at 1 kV.
Dxr micro raman spectrometer
Manufactured by Thermo Fisher Scientific
Sourced in United Kingdom
The DXR micro-Raman spectrometer is a laboratory instrument designed for Raman spectroscopy analysis. It provides high-resolution Raman measurements for the identification and characterization of materials. The DXR micro-Raman spectrometer utilizes a laser source and optical components to collect and analyze the Raman scattering from samples.
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4 protocols using dxr micro raman spectrometer
1
Advanced Characterization of Thin Films
2
Raman Spectroscopic Analysis Protocol
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Measurements were recorded by a DXR micro-Raman spectrometer (Thermo Fisher Scientific, UK) equipped with a 633 nm laser set to 0.4 mW. Calibration was done on a polystyrene standard, the chosen objective was 50×, and the pinhole was set to 50 μm. Spectra were then recorded between 500 and 4000 cm−1 with a resolution of 2.5 cm−1. All spectra were processed by background subtraction and normalisation by the G band intensity using OriginPro 8.5.1 software.
3
Optical Characterization of Thin Films
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A DXR micro-Raman spectrometer was used for a backscattering geometry of the sample from ThermoFisher Scientific with a diode laser of 532 nm (2.33 eV). Ultraviolet-visible (UV-vis) absorption measurements of the thin films were recorded using a single monochromator V-770 UV-vis-NIR spectrophotometer from Jasco in the wavelength range of 200–800 nm. Room temperature photoluminescence (RT-PL) measurements were performed with a Perkin Elmer Spectrofluorometer LS55 (Xenon source).
4
SERS Spectroscopy for Duck Meat Analysis
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For measuring SERS spectra, about 50 μL of colloidal gold nanoparticles was dropped directly onto the duck meat sample on the glass slide, and then was illuminated after waiting for 2 min by a DXR micro Raman spectrometer (Thermo Fisher Scientific Co., Ltd., Waltham, MA) equipped with a semiconductor laser of 780 nm excitation wavelength fixed at 20 mW. In addition, 10 s preview acquisition time, 10 s sample exposure time and 16 s background exposure times were set. The SERS spectra in the wavenumber range of 50 to 3,000 cm−1 were used for data analysis.
The SERS spectrum of each sample was measured only one time. A total of 478 SERS spectra were measured for four groups of duck meat samples, of which two thirds (318) were randomly selected as the training set to establish the discriminant model, and the rest were used as the test set to verify the classification accuracy. The validity of the discriminant model was verified by the classification accuracy (i.e., the ratio of the number of samples correctly predicted by the model to the total number of samples).
The SERS spectrum of each sample was measured only one time. A total of 478 SERS spectra were measured for four groups of duck meat samples, of which two thirds (318) were randomly selected as the training set to establish the discriminant model, and the rest were used as the test set to verify the classification accuracy. The validity of the discriminant model was verified by the classification accuracy (i.e., the ratio of the number of samples correctly predicted by the model to the total number of samples).
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