1. Updated September 2011 Gold Nanoparticle Synthesis Experiment

2. Updated September 2011 Gather Supplies Safety goggles 500 mL Pyrex beaker distilled water salt Sodium Citrate (Prestone™ Super Radiator Flush) pipette heated Stirring plate 12-36 Volt power supply Alligator clips 24K Gold coin or wire Gram scale

3. Updated September 2011 Measure 400 mL distilled water into a beaker. Place it on the heated stirring plate. Image by HighPoint Learning

4. Updated September 2011 Place the copper wire or foil into the beaker. Suspend the gold wire or coin with the red alligator clip so that the clip does NOT touch the water. Image by HighPoint Learning

5. Updated September 2011 Pour in 2 mL sodium citrate and 58 mg salt. Image by HighPoint Learning

6. Updated September 2011 Start the stirrer. Adjust the alligator clip so it does not touch the water so that it does not oxidize and contaminate your results. Image by HighPoint Learning

7. Updated September 2011 Text box This is a small 24K Chinese coin purchased at a local coin dealer. Image by HighPoint Learning

8. Updated September 2011 Text box Attach the black alligator clip to the copper. Turn on the power supply as well as the stirring plate. After about an hour, the water will turn pink. Image by HighPoint Learning

9. Updated September 2011 This is a simple car battery charger used as a power supply. Image by HighPoint Learning

10. Updated September 2011 After another hour, the water will look darker red or purple. Pour the resulting liquid in a bottle for future experiments. Image by HighPoint Learning

11. Updated September 2011 This module is one of a series designed to introduce faculty and high school students to the basic concepts of nanotechnology. Each module includes a PowerPoint presentation, discussion questions, and hands-on activities, when applicable. The series was funded in part by: The National Science Foundation Grant DUE-0702976 and the Oklahoma Nanotechnology Education Initiative Any opinions, findings and conclusions or recommendations expressed in the material are those of the author and do not necessarily reflect the views of the National Science Foundation or the Oklahoma Nanotechnology Education Initiative.

12. Updated September 2011 References Lisensky, George. Synthesis of Gold Nanoparticles. (2011). Exploring the Nano World. Retrieved from http://mrsec.wisc.edu/Edetc/nanolab/gold/index.html http://mrsec.wisc.edu/Edetc/nanolab/gold/index.html