Two-approach study for preparing stable colloidal gold nanoparticles in organic solvents by using 1-dodecyl-3-methylimidazolium bromide as an efficient capping and phase transfer agent

摘要: Abstract Efficient preparation of stable gold nanoparticles in an organic solvent has been studied. To do this, two approaches have performed. In the first approach, AuCl 4 − and sodium borohydride were used, respectively, as precursor reducing agent presence ionic liquid 1-dodecyl-3-methylimidazolium bromide ([C 12 mim]Br) capping aqueous phase. Extraction into different solvents showed that phase transfer efficiency chloroform was higher than dichloromethane, toluene n-heptane. The for more three months. effect experimental conditions on checked by UV–vis spectroscopy, dynamic light scattering transmission electron microscopy. second complex [C mim]Br with , after formation (upper phase), extracted chloroform. Sodium solution injected followed vigorous stirring. result production dispersed through reduction borohydride. Both compared each other terms reproducibility, procedure time, size liquid. A (prepared approach) brought contact either cysteine or homocysteine order to form a thin film at water/chloroform interface.