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Synthesis Of Pbse Lab Report

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2. Experimental method 2.1 Synthesis of PbSe and PbSe: Nd nanoparticles Neodymium doped PbSe samples (Pb1-xNdxSe) with x=0, 0.05, 0.10 at pH 5 were prepared by wet chemical precipitation technique, adding hydrazine hydrate as the precipitating agent at room temperature. Freshly prepared aqueous solution and analytical grade lead nitrate (Pb(NO3)2), neodymium oxide (Nd2O3) and selenium dioxide (SeO2) were used as precursor materials. Initially, 2 g of lead nitrate and 0.555 g selenium dioxide were separately dissolved in 60 ml of double distilled water in three neck flask and stirred for 30 min. Conversion of neodymium oxide into nitrate by adding 2N nitric acid in a water bath is used as dopant precursor. This freshly prepared aqueous solution was added in lead nitrate solution with constant stirring until pale violet color turbid free solution is reached. The precipitation process was carried by drop wise addition of selenium dioxide into the lead nitrate solution under vigorous stirring, followed by addition of hydrazine hydrate to fix the pH and allowed to …show more content…

5. The PL intensity depends on density of photoexcited electrons, excitation wavelength and intensity of the incident beam. To emit photon of light, irradiate the excitation wavelength equivalent to the absorption onset which stimulates the electron from the valance to the conduction band [21]. The emission peak positioned at 621 nm and it shifts towards higher wavelength region with an increase of dopant concentration. This slight variation may be due to variation in the energy gap of the material. Through optical study, it is observed that with an increasing dopant concentration, band gap value decreases and emission band values are shifted. This shift in PL spectra may be due to imperfection in interfacial region, dangling bonds or stoichiometries defects of nanocrystalline

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