دانلود گزارش کارورزی و کار آموزی

چکیده : 

A novel and facile wet chemical method is presented to synthesize zinc oxide nanoparticles (NPs) under

ambient atmosphere and temperature. Keggin type heteropolyoxometalate (H3[PW12O40]) was used as

stabilizer and the effect of stirring time and amount of H3[PW12O40] (HPW) were studied. XRD and

TEM techniques were applied for the morphological and structural characterizations of NPs. Size of nanoparticles

were determined using TEM, Scherrer’s formula as well as effective mass approximation. The

results of these three methods are in good agreements and revealed single hexagonal zincite type crystalline

with average particle size in the range of 3–15 nm. Photoluminescence behavior of the prepared

sample shows a strong orange to red emission centred at about 620–635 nm, a green emission at around

550 nm and broad UV emission at around 400 nm.