Objective
- To synthesize citrate-coated GNPs 40-45nm in size
- To synthesize polydopamine-coated GNPs
Citrate Coated GNPs
- Prepare stock solutions
- Dissolve HAuCl4 in water to have a solution of 10mM
- Dissolve 250mg of the citrate sodium salt into 25mL of water
- In a beaker mix 50mL of water and a volume of the gold stock solution corresponding to 1.214*10^-2 moles of Gold
- Bring solution to a boil
- Add a 0.5mL of the citrate sodium solution and reflux for 30 minutes
- Note color change from dark blue to red
Data
- We made three separate citrate-GNP solutions at the same time
- One of the solutions changed color to blue first, however, it also did not turn red (deep purple)
- The other two solutions changed color to blue and then red
- Solution 1: 20-25nm
- Solution 2: 14-16nm
- Solution 3 (deep purple): 4-5nm
- We made two more citrate-GNP solutions and this time we used a stir bar
- The solutions changed color to blue and then red
- Solution 4: 35nm
- Solution 5: 25nm
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