Figure 4 shows the XRD pattern of
CdSe, CdSe-TiO2, and C60-modified CdSe-TiO2 particles. It can be seen that the TiO2 modificator is of the anatase structure. It can also be seen from Figure 4 that the crystallization of the annealed TiO2 is worse than that of the pure TiO2 implanted. XRD analysis used to determine the phase purity of the samples. SAHA HDAC nmr Figure 4 shows the XRD patterns of the component results of CdSe and CdSe-TiO2 photocatalysts. Figure 4 shows all of the peaks around 2θ of 25.4°, 42°, and 49.6°, which could be indexed to the characteristic peaks (111), (220), and (311) plane reflections of cubic crystal structure CdSe with a lattice constant of 6.05 Å (JCPDS 65–2891) find more [21, 22]. Moreover, with the CdSe-TiO2 photocatalyst, some peaks were also found
at 37.9°, 47.8°, 55°, and 62.7°, which could be indexed to the characteristic peaks (004), (200), (201), and (204) of anatase TiO2 (JCPDS 21–1272) [23, 24]. No peaks for impurities were detected. Figure 4 XRD patterns of CdSe, CdSe-TiO 2 , and CdSe-C 60 /TiO 2 . Figure 5 shows TEM images of CdSe-C60/TiO2. The representative TEM images in Figure 5 show that the prepared powders are uniform with some aggregations between particles. The mean diameter of C60 was estimated to be approximately 20 to 30 nm. From Figure 5, the image of CdSe-C60/TiO2 compounds showed that all particles had agglomerated. This suggests that the presence of CdSe and C60 Phosphatidylethanolamine N-methyltransferase can efficiently enhance the agglomeration of TiO2 and impede the dispersion of nanoparticles. Figure 5 TEM image of the CdSe-C 60 /TiO 2 compounds. UV–vis reflectance analysis was carried out on various systems of interest, and the measurements were then converted to absorbance spectra using Kubelka-Munk method. Figure 6 shows the UV–vis diffuse reflectance spectra of the CdSe, CdSe-TiO2, TiO2, and CdSe-C60/TiO2. As expected, the spectrum obtained from the bare TiO2 shows that TiO2 absorbs mainly the UV light with absorption wavelength below 400 nm. After the introduction of CdSe, the absorption edge is shifted toward the visible region. The
CdSe exhibits the fundamental absorption edge at about 812 nm. For CdSe-TiO2, the absorbance spectrum has two absorbance www.selleckchem.com/products/GSK872-GSK2399872A.html onsets at approximately 738 nm and 400 nm, corresponding to the presence of CdSe and TiO2 particles, respectively. It is interesting to note that the onset for TiO2 absorption was almost unchanged (at a wavelength of about 400 nm) while the CdSe absorbance onset at 812 nm was a blueshift to the wavelength of 738 nm. This indicated an increase in the bandgap of CdSe due to the introduced TiO2. CdSe-C60/TiO2 exhibits the good adsorption effect at visible region because of the synergistic reaction of CdSe, C60, and TiO2. Figure 6 UV–vis diffuse reflectance spectra of CdSe, CdSe-TiO 2 , TiO 2 , and CdSe-C 60 /TiO 2 .