Metal Oxide (Quantum Dots) for Gas Sensor Application

Abstract

The research included the preparation of zinc oxide (Quantum Dots) with a diameter of 4.33- 6.37 nm as indicated in the results of transmissionelectron (HRTEM) microscopy at different points of the colloidal (ZnO Q.Ds) produced using Iraqi materials and simple conventional devices available in the local market. . The manufacturing process was carried out by a simple chemical process by adding 0.4 g of crystallized zinc acetate to 100 ml of isopropyl alcohol C3H 9O with constant stirring for a period of 30 minutes under the influence of 70 oC temperature. The effect of adding sodium sulphide (Na2S) has been studied where the weight (0.15 grams) was added to the previous solution prepared within the above paragraph and then added 10 ml of TEA under the effect of constant stirring using a magnetic mixer for five hours . Then a white colloidal ZnO was obtained and separated using a 6000 rpm centrifuge for only one hour. The product was washed with distilled water and methanol and dried in a vacuum oven for 7 hours at a drying temperature of 50 oC. The results of the synthesis properties of zinc oxidized colloidal quantum dots by X-ray diffraction study showed that zinc oxide granules were centered towards (102), (110), (103), (200), (112), (201), (101), (100) and (002). The sensitivity results showed high efficiency of gas sensing under lighting effect.