Through the reduction of [AuCl4]- by aqueous sodium borohydride in the presence of 9-(5-thiopentyl)-carbazole, the gold nanoparticles has been prepared and characterized. Through the reduction of [AuCl4] -by aqueous sodium borohydride in the presence of 9- (5-thiopentyl) -carbazole, the gold nanoparticles have been prepared and characterized.