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Gold nanoparticles with size 3-10 nm (diameter) were prepared by the reduction of HAuCl 4 in a CTAB/octane + 1 butanol/H 2O reverse micelle system using NaBH 4 as the reducing agent. The as formed gold nanoparticle colloid was characterized by UV/vis absorption spectrum and transmission electron microscopy(TEM). Various capping ligands, such as alkyl thiols with different chain length and shape, trioctylphosphine (TOP), and pyridine are used to passivate the gold nanoparticles for the purpose of self organization into superstructures. It is shown that the ligands have a great influence on the self organization of gold nanoparticles into superlattices, and dodecanethiol C 12 H 25 SH is confirmed to be the best ligand for the self organization. Self organization of C 12 H 25 SH capped gold nanoparticles into 1D, 2D and 3D superlattices has been observed on the carbon coated copper grid by TEM without using any selective precipitation process.
Gold nanoparticles with size 3-10 nm (diameter) were prepared by the reduction of HAuCl 4 in a CTAB / octane + 1 butanol / H 2O reverse micelle system using NaBH 4 as the reducing agent. The as formed gold nanoparticle was UV / vis absorption spectrum and transmission electron microscopy (TEM). Various capping ligands, such as alkyl thiols with different chain length and shape, trioctylphosphine (TOP), and pyridine are used to passivate the gold nanoparticles for the purpose of self organization into superstructures It is shown that the ligands have a great influence on the self organization of gold nanoparticles into superlattices, and dodecanethiol C 12 H 25 SH is confirmed to be the best ligand for the self organization. Self organization of C 12 H 25 SH capped gold nanoparticles into 1D, 2D and 3D superlattices has been observed on the carbon coated copper grid by TEM without using any selective precipitation process.