Dendron-Controlled Nucleation and Growth of Gold Nanoparticles We thank the University of Arizona and the Research Corporation for financial support. Acknowledgement is also made to the donors of the Petroleum Research Fund, administered by the American Chemical Society, for partial support of this research. The X-ray diffractometer was purchased with support from the U.S. National Science Foundation (CHEM-9610374). We thank Dr. K. Nebesny for help with the XPS experiments.