Therefore, the structural and optical characterization of prepared samples was carried out by using these instruments.
3.2 Synthesis of ZnO Nanostructures
ZnO nanoparticles were prepared by using the following reagents : Starch solution Zinc nitrate hexahydrate {Zn〖(NO_3)〗_2 .6 H_2 O} Sodium hydroxide { NaOH) Freshly prepared ammonia solution.
In order to prepare 0.01M of ZnO nanoparticles, the following steps were followed:
The 0.01 M of Sodium hydroxide { NaOH} solutions in starch was prepared by adding 0.04 gm of NaOH powder dissolved in 100 ml of 3% starch solution. The solutions were stirred for 1 hour at the temperature of 〖50〗^0C at about 250 RPM. Again, 0.01M of Zinc nitrate hexahydrate {Zn〖(NO_3)〗_2 .6 …show more content…
The depositions were carried out at room temperature. The matrix solutions were prepared separately by an aqueous solution (3% by volume) of Starch with constant stirring at a constant temperature 800 C maintained for 2 hours. Cadmium acetate solution was prepared at 0.1M concentration for Starch solutions in presence of ammonia solution (pH maintained at 9.5). These solutions were added to Sodium Sulfide (Na2S) solution under constant stirring for another 1 hours. The prepared samples were yellow in color indicating the formation of CdS nanostructures. Cadmium acetate was dissociated into Cd+2 ions. After adding ammonia solution, it formed the cadmium complex. This complex solution was then reacted with the sulfur ion from Na2S and results …show more content…
The Zinc nitrate hexa hydrate [Zn(NO3)2.6H2O] and sodium hydroxide (NaOH) was adopted as synthesis precursors. The production unit for this chemical synthesis method was consisted of three neck glass flask and of a magnetic stirrer with temperature control. The reaction was carried out in a nitrogen environment to prevent oxidation. In the plass chamber, NaOH was dissolved in Starch solution (3% concentration of Starch in double distilled water solution) to a concentration of 0.1M and the resulting solutions were stirried at 700 C for 1 hour. Then, a solution of 0.5 M Zn(NO3)2.6H2O was added dropwise under constant stirring. For collection of core ZnO, half portion of the material was filtered and washed several times with deionized water and ethanol. The washed samples were dried at 650 C in the oven for 1 hour. The shell CdS nanoparticles were prepared by simultaneous addition of Cadmium Acetate solutions and Sodium Sulfide (Na2S) solutions. The synthesis was carried out at room temperature. The pH of the solution was kept at 9 by adding ammonia solution. The molarity of the solution was maintained at 0.1 M. ZnO/CdS core/shell nanostructures were prepared by altering core to shell ratio as 1:1 (B), 1:2 (C) and 1:3 (D) for thicker shell coating of CdS. The three samples of the core/shell were considered for structural and optical properties
3.2 Synthesis of ZnO Nanostructures
ZnO nanoparticles were prepared by using the following reagents : Starch solution Zinc nitrate hexahydrate {Zn〖(NO_3)〗_2 .6 H_2 O} Sodium hydroxide { NaOH) Freshly prepared ammonia solution.
In order to prepare 0.01M of ZnO nanoparticles, the following steps were followed:
The 0.01 M of Sodium hydroxide { NaOH} solutions in starch was prepared by adding 0.04 gm of NaOH powder dissolved in 100 ml of 3% starch solution. The solutions were stirred for 1 hour at the temperature of 〖50〗^0C at about 250 RPM. Again, 0.01M of Zinc nitrate hexahydrate {Zn〖(NO_3)〗_2 .6 …show more content…
The depositions were carried out at room temperature. The matrix solutions were prepared separately by an aqueous solution (3% by volume) of Starch with constant stirring at a constant temperature 800 C maintained for 2 hours. Cadmium acetate solution was prepared at 0.1M concentration for Starch solutions in presence of ammonia solution (pH maintained at 9.5). These solutions were added to Sodium Sulfide (Na2S) solution under constant stirring for another 1 hours. The prepared samples were yellow in color indicating the formation of CdS nanostructures. Cadmium acetate was dissociated into Cd+2 ions. After adding ammonia solution, it formed the cadmium complex. This complex solution was then reacted with the sulfur ion from Na2S and results …show more content…
The Zinc nitrate hexa hydrate [Zn(NO3)2.6H2O] and sodium hydroxide (NaOH) was adopted as synthesis precursors. The production unit for this chemical synthesis method was consisted of three neck glass flask and of a magnetic stirrer with temperature control. The reaction was carried out in a nitrogen environment to prevent oxidation. In the plass chamber, NaOH was dissolved in Starch solution (3% concentration of Starch in double distilled water solution) to a concentration of 0.1M and the resulting solutions were stirried at 700 C for 1 hour. Then, a solution of 0.5 M Zn(NO3)2.6H2O was added dropwise under constant stirring. For collection of core ZnO, half portion of the material was filtered and washed several times with deionized water and ethanol. The washed samples were dried at 650 C in the oven for 1 hour. The shell CdS nanoparticles were prepared by simultaneous addition of Cadmium Acetate solutions and Sodium Sulfide (Na2S) solutions. The synthesis was carried out at room temperature. The pH of the solution was kept at 9 by adding ammonia solution. The molarity of the solution was maintained at 0.1 M. ZnO/CdS core/shell nanostructures were prepared by altering core to shell ratio as 1:1 (B), 1:2 (C) and 1:3 (D) for thicker shell coating of CdS. The three samples of the core/shell were considered for structural and optical properties