Synthesis of ZnO-TiO2/Chitosan Nanorods By Using Precipitation Methods and Studying Their Structures and Optics Properties at Different Precursor Molar Compositions

Abstract

ZnO-TiO2/Chitosan nanorods were synthesized by precipitation method from mixture Zinc nitrate dihydrate (Zn (NO3)2.2H2O) and Titanium Iso Propoxide (TIP) as precursors with different ratio molar composition of ZnO and TiO2 at pH = 11.0. Then, addition of sodium hydroxide (NaOH) and Methylenamine (C6H12N4) for control pH solution. ZnO-TiO2/Chitosan resulting from the characterization of X-ray diffraction (XRD) show that ZnO-TiO2/Chitosan with hexagonal wurtzite structures. The nanorods size of ZnO-TiO2/Chitosan is (35 – 42) nm. Surface topographic information investigated by Scanning Electron Microscopy (SEM) shows the distribution of shapes are nanorods. The interactions Zn-O-Ti were studied on the Fourier Transform-Infrared Spectroscopy (FT-IR) analysis on wave numbers 680 cm−1. The optical properties indicated UV-Vis Diffuse Reflectance Spectroscopy (UV-DRS) shows the result of modification of different precursor compositions of ZnO and TiO2 giving a smaller value (Eg = 3.24 – 3.25 eV) when compared without doped TiO2 (Eg = 3.32 eV) and on any difference the composition significantly does not provide different band gap values.