Paper Title
Structural Properties of Calcite Thin Film on Fluorine Doped Tin Oxide By Thermal Chemical Vapour Deposition

Abstract
Calcium Carbonate (CaCO3)crystalline nature determines the shape and morphology and varies accordingly. Among all, calcite is the most thermodynamically stable polymorph of Calcium Carbonate (CaCO3) therefore this work aims to synthesize CaCO3 in thin film form, in calcite polymorph and describe its structural properties. Synthesis of calcite was done by thermal chemical vapour deposition method (CVD) on Calcium Chloride precursor in Carbon Dioxide gas at 100sccm at 400°C. Calcium Carbonate thin film is produced independent of any additional additives or polymeric substance on Fluorine Doped Tin Oxide (FTO) substrate. X-ray Diffraction Analysis confirms the synthesized product is calcium carbonate in calcite polymorph. Energy Dispersive X-rayatomic composition results is agreeable to elemental composition of CaCO3. EDX analysis shown that atomic percentage for Carbon (C) is inversely proportional to Calcium (Ca) and Oxygen (O). Crystallite size of 33.8nm was calculated by Scherrer equation whereas grain size obtained from FE-SEM micrograph measured 90nm to 272nm in approximate ranges. EDX analysis and FE-SEM micrograph confirmed that the deposited compound is comprised of only one polymorph which is calcite. This work demonstrated CaCO3 thin film was synthesized by thermal CVD method crystalline in calcite polymorph with sizes in nanometer range. The nanocrystalline is monoclinic and rhombohedral in shape. The structural properties, shape and lattice parameters were also described. Keywords - Calcite Thin Film;Thermal CVD;Calcium Carbonate Nanocrystalline;FTO Substrate