We discuss the formation of gold metal colloids in a variety of surfactant/solvent systems. Static and dynamic light scattering, small angle xhyphen;ray and neutron scattering, TEM analysis, and UVhyphen;visible absorbance are used to characterize the kinetics of formation and final colloid stability. These gold colloids exhibit a dramatic blueshift and broadening of the plasmon resonance with decreasing colloid size. Several types of reduction method are discussed and differences between micelle (waterhyphen;free) or microemulsions as reaction media are compared. Use of inverse micelles allows smaller clusters to be formed with greater longhyphen;term stability.
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