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Highly stable, uniform, and monodisperse Au nanoparticles, protected by hyperbranched poly(amine-ester) (HPAE-5), were prepared by reducing HPAE-5/hydrogen tetrachloroaurate using sodium borohydride in aqueous solution. UV-visible absorption, Fourier transform infrared spectroscopy, dynamic light scattering (DLS), transmission electron microscopy (TEM) and electron diffraction (ED) have been used to study the structure and characterization of the nanocomposites. From which, it can be suggested that Au nanoparticles are formed inside HPAE-5 and located offset from the center, besides that the distribution of Au nanoparticles is narrow. The simple procedure and good results allow for a complete understanding of previous reported difficulties in preparing Au nanoparticles by wet method. [Copyright &y& Elsevier]

Au nanoparticles were prepared by reduction of HAuCl4 with NaBH4 in the presence of generation 1.5 poly(amidoamine) dendrimers with surface hydroxyl groups (OH-PAMAM-1.5). By optimizing the conditions of the preparation, stable, and uniform Au nanoparticles of 2.7±0.5 nm were obtained. UV-Vis absorption, Fourier transform infrared (FT-IR) spectroscopy, dynamic light scattering (DLS), transmission electron microscopy (TEM) and electron diffraction (ED) have been used to study the structure and characterization of the nanocomposites. From which, it could be suggested that Au nanoparticles were surrounded by OH-PAMAM-1.5 and the size distribution of Au nanoparticles is narrow. [Copyright &y& Elsevier]