Synthesis of Copper Nanoparticles in water by using Copper Nitrate as precursor, Hydrazine Hydrate as reducing agent and PVP as capping agent
Check List: Copper Nitrate, Polyvinylpyrrolidone (PVP), Hydrazine Hydrate, Water, Beaker, Magnetic Stirrer, Dropper and Measuring Cylinder
STEP1: Take distilled water (100ml) at 60ºC and slowly add Polyvinylpyrrolidone-30 (2g) and stir until it dissolve properly
STEP2: Add Copper Nitrate (1g) and stir for more 10 minutes
STEP3: Add Hydrazine Hydrazine Hydrate (5%) dropwise with vigorous stirring until the colour turns Green. The Green colour indicates the formation of Copper Nanoparticles in water.
RESULTS: The average size of Copper Nanoparticles would be less than 10nm; UV-Vis spectroscopy absorption peak would be obtained around 600nm.
FACTORS AFFECTING THE SYNTHESIS:
- Concentration of Polyvinylpyrrolidone: Polyvinylpyrrolidone (PVP) is used as the capping agent in this synthesis method. Hence if the concentration of PVP is changed, then size of Copper Nanoparticles will also change. Lower the concentration of PVP, bigger the particle size.
- Concentration of Copper Nitrate: Copper Nitrate is used as the precursor in this. Higher the concentration of Copper Nitrate, bigger the size of Copper Nanoparticles.
- Concentration of Hydrazine Hydrate: Hydrazine Hydrate is used as the reducing agent in this synthesis method. Higher the concentration of Hydrazine Hydrate, more chances of agglomeration of Copper Nanoparticles, leads to bulky reddish bulky color particles.
- Effect of Temperature: Higher temperature mostly leads to good size distribution size range particles but in this synthesis PVP polymer bonds may break if you try to increase the temperate beyond 80ºC.
NOTE: All the experiments should be done under the guidance of lab Incharge; and proper lab safety instructions.