Fabrication and optimization of chloride sensor based on ZnO nanostructure / Nur Azyan Mohamad Arifin

The fabrication of chloride detector based on zinc oxide (ZnO) nanostructures which have a sensitivity toward a chlorine gas. Zinc oxide nanostructure can be grown with various method. In this experiment, ZnO nanostructure were grown by the catalytic immersion method using Zinc Nitrate Hexahydrate (Zn(N0₃)₂6H₂0) as a precursors and Urea(CF₄N₂O) as a stabilizer in which growth on silicon substrate with phosporus layer as a catalyst with different molarity concentration has been taken in the molarity. The morphology of the zinc oxide nanostructures was characterized using field emission scanning electron microscope (FESEM) and photoluminescene (PL). The result on surface morphology and optical properties including UV emission are presented and discussed. Based on the result from zinc oxide nanostructures with the changing molarity concentration, it can be seen nanoflakes are formed with the highest energy band gap is 3.21 eV. The sample of 0.05 M shows it has the low molarity concentration where it is most sensitive to chlorine gas with 90 % of sensitivity revealed by the (I-V) measurement which have smaller size on nanostructures and higher energy band gap. Based on the results, these samples are categorized as the most sensitive sample of chlorine gas and it is proposed that lower concentrations are potential candidates for the chloride detector and optical devices.