The step-by-step approach to correctly compute the secondary data from diffuse reflectance data for Tauc's plot was elucidated in this paper. The UV–vis diffuse reflectance data of CVD-grown β-Ga 2 O 3, ZnO and thermally produced TiO 2 films were used for the study. The authors are of the opinion that the relatively simple method …
An automated method to determine the band gap energy (E g) of pure and mixed powder compounds using diffuse reflectance spectroscopy is presented.This method is based on a five-step algorithm that mimics the judgment made by an expert analyst in identifying the linear segments in Tauc plots and subsequent estimation of the …
The difuse reflectance measurements exhibited the decrease in NIR reflectance with increasing Cr content. The sample with lower content of Cr, 0.5 wt% of Cr precursor to …
Download scientific diagram | a UV-vis diffuse reflectance spectra of ZnO, RGO/ZnO, and Ag/RGO/ZnO nanocomposites by varying Ag content. b Tauc Plot of the nanocomposites from publication ...
Measurements of the diffuse reflectance of TiO 2 semiconductor coatings, such as are used for water splitting, are analysed using the Kubelka–Munk radiative transfer model. The widely used practice of determining the band gap of the coating directly from the diffuse reflectance is found to be inaccurate, since the diffuse reflectance depends on …
After grinding the sample, it was calcined in a muffle furnace for 3 h at 500 °C at a heating rate of 10 °C per minute. Finally, the product is ground before being packed, labeled, and ready for use. ... Diffuse reflectance spectra of pure ZnO and ZnO/30% ATP are shown in Fig. 6a. As can be observed in the image, the pure ZnO generated in ...
UV-vis spectra of the samples in the diffuse re- flectance mode (R) are shown in Fig. 6. The pure ZnO samples showed the highest reflectance, while Ag/ZnO samples demonstrated lower reflectance in ...
The average grain size of the ZnO nanoparticles is in the range of 24–40 nm, depending on the mechanical grinding time. The UV–vis diffuse reflectance …
Download scientific diagram | Tauc plots and diffuse reflectance spectra (inset) of ZnO (red line), Fe 2 O 3 (green line), and ZnFe 0.05 (blue line) photocatalysts. The absorption edges of ZnO and ...
Physical and chemical characterizations of zinc-based MOFs. A TEM images of TiO 2, ZnO and ZIF-8. B Digital photographs of TiO 2, ZnO and ZIF-8.ZIF-8 suspension was more transparent relative to TiO 2 and ZnO. C Diffuse reflection spectra and D calculated UV–Vis absorbance spectra for TiO 2, ZnO and zinc-based MOFs.ZIF …
The AZOC composite with average fiber diameter of 31 nm (under grinding treatment of 30 times) exhibited the highest porosity (94.6 %). The obtained ZnO/MNCF and AZOC composites were further analyzed using X-ray diffraction (XRD), Raman spectrometry, X-ray photoelectron spectroscopy (XPS), and UV–vis diffuse reflectance …
Schematic of typical diffuse reflectance spectroscopy (DRS) system, showing the hand-held probe, separation between source and detector fibers ( ρ0 ), light source, spectrometer, and spectral output, and images of a typical diffuse reflectance probe. Probe images are reprinted and adapted from Rajaram et al. Laser Surg Med …
Diffuse reflectance spectroscopy investigations indicated that the synthesized materials can act as photocatalysts under UV illumination. ... (g-C 3 N 4), TiO 2, ZnO, CdS ... The latter, MgTiO 3 ...
Fig. 3 (a)–(f) depicts reflectance spectra measured in the batch 2 ZnO wafers implanted at RT and LT to numerous doses. In the wide photon energy range from 1.6 to roughly 2.6 eV, no profound differences can be observed in the reflectance spectra of the samples implanted to the doses from 3.6 × 10 12 to 4.9 × 10 14 ions/cm 2.The …
Magnetically separable lanthanum modified Ni-Zn spinel ferrite nanoparticles (Ni0.75Zn0.25La0.06Fe1.94O4) and Ni0.75Zn0.25La0.06Fe1.94O4@rGO nanocomposites were successfully synthesized by the sol ...
The optical characteristics are explored using diffuse reflectance spectroscopy to estimate the redshift in the band gap (3.18 eV) using the Kubelka-Munk formulism. ... Near IR reflectance characteristics of PMMA/ZnO nanocomposites for solar thermal control interface films. Solar Energy Materials and Solar Cells, Volume 125, …
Section snippets Catalyst preparation. Four types of Cu/ZnO samples (all with a Cu/Zn atomic ratio of 50/50) were prepared by different dry- and wet-chemical synthesis methods, including soft reactive grinding of oxalic acid with the Cu/Zn basic carbonate precursors (GC-CZ), soft reactive grinding of oxalic acid with the Cu/Zn …
During MP, ZnO particles grinding (D X ZnO ~16 nm at t MP =390 min), deagglomeration (t MP ≤30 min) and "secondary" agglomeration (t MP >30 min) processes take place. UV–vis diffuse reflectance spectroscopy results (Fig. 3 f and Fig. 9) show that a significant increment of NiO surface takes place at t MT →30 min.
Download scientific diagram | Diffuse reflectance spectra of the ZnO nanoparticles calcined at 200°C, 400°C and 500°C temperatures. from publication: Aqueous chemical route synthesis and the ...
The average grain size of the ZnO nanoparticles is in the range of 24–40 nm, depending on the mechanical grinding time. The UV–vis diffuse reflectance spectrum of the ZnO nanoparticles ...
Context 1. ... reflectance spectra of ZnO nanoparticles and ungrinded ZnO powders are shown in Fig. 5. This figure indicates that the band edge absorbance behaviour for both …
The mechanochemical reaction of zinc peroxide (ZnO 2) with zinc (Zn) and copper (Cu) metal powders was examined. Ex-situ characterization of samples was adopted to monitor the progress of reaction and to determine the nature of final product. Cubic ZnO 2 transformed to hexagonal ZnO after grinding for 4 h. Band gap of the sample, …
The UV–vis diffuse reflectance spectrum indicates sharp absorption edge distinctive for ZnO nanoparticles, observed at 372 nm (Figure 8). As the reflectance, not absorbance spectrum had been received, the band gap determination could not be performed directly from the Tauc equation and the Kubelka–Munk function had to be …
Download scientific diagram | UV–vis diffuse reflectance spectra of pure ZnO and ZnO:Co nanorods from publication: A high performance cobalt-doped ZnO visible light …
UV-Vis spectrum in reflectance mode was carried out to study the optical proper ties of the as synthesized ZnO NPs and is shown in Fig.7. It is seen from Fig.7 that the diffused reflectance ...
Diffuse reflectance spectroscopy is a technique used to collect and analyze scattered IR energy, which in turn is used to measure extremely fine particles or course surfaces. Scattering in spectroscopy often relies on well-engineered optical contrast agents, such as gold nanoshells. Efforts to understand the reflectance properties exhibited by ...
For the diffused reflectance spectrum, the ratio of the light scattered from an infinitely thick layer and the scattered light from an ideal non-absorbing reference sample is measured as a function of the wavelength. The illumination of powdered samples by incident radiation leads to diffuse illumination of the samples.