PHOTOCHEMICAL GENERATION OF GOLD NANOPARTICLES IN LANGMUIR-BLODGETT-FILMS

Gold nanoparticles were generated by ultraviolet irradiation of Langmu ir-Blodgett (LB) films of octadecylamine (ODA), 4-hexacylaniline (HDA) , and benzyldimethylstearylammonium chloride monohydrate (BDSAC) depos ited from aqueous HAuCl4 subphases. Ln contrast, no gold crystals were observed in irradiated LB films prepared from monolayers of dipalmito yl-DL-alpha-phosphatidyl-L-serine (DPPS) and dipalmitoyl-L-alpha-phosp hatidylcholine (DPPC). X-Bay photoelectron spectroscopy, W-visible abs orption spectroscopy, atomic force microscopy, and transmission electr on microscopy measurements indicated the marked influence of the surfa ctants used to prepare the LB matrix on the shape of the gold particle s. Particles formed in ODA and BDSAC LB films were grown with well-def ined crystal faces, while particles generated in HDA LE films were irr egular in shape.