Seeding growth for size control of 5-40 nm diameter gold nanoparticles

Following a seeding growth approach, gold nanoparticles of diameters 5-40 n m were prepared with 10-15% standard deviation in diameter from 3.5 +/- 0.7 nm gold particle seeds. Particle size can be controlled by varying the rat io of seed to metal salt, and thus any size in the range 5-40 mn can be pre pared. The method can also be scaled up to produce 10-100 mg of gold nanopa rticles.