CONSIDERATIONS TO KNOW ABOUT INFRARED OPTICAL

 5a]. The absorption edge for samples VT400 and VT700 transpired at ~ 503 nm and ~ 470 nm. Alternatively, the transmittance decreased a bit with expanding substrate temperature inside the NIR spectra vary, which may be attributed to the large particle size and deficiency of porosity for VT700. Figure 5b displays the reflectance spectra