5 SIMPLE STATEMENTS ABOUT INFRARED OPTICAL EXPLAINED

 5a]. The absorption edge for samples VT400 and VT700 occurred at ~ 503 nm and ~ 470 nm. However, the transmittance decreased marginally with growing substrate temperature during the NIR spectra vary, which might be attributed to the massive particle measurement and not enough porosity for VT700. Figure 5b displays the reflectance spect