title: Synthesis of Ag and AgI quantum dots in AOT-stabilized water-in-CO2 microemulsions.
abstract: Silver and silver iodide nanocrystals have been synthesized in the water-in-CO(2) reverse microemulsions formed by the commonly used surfactant, sodium bis(2-ethylhexyl)sulfosuccinate (AOT), in the presence of 2,2,3,3,4,4,5,5-octafluoro-1-pentanol as cosurfactant. The nanometer-sized aqueous domains in the microemulsion cores not only act as nanoreactors, but the surfactant interfacial monolayer also helps the stabilization of the metal and semiconductor nanoparticles. The transmission electron microscopy results show that silver and silver iodide nanocrystals with average diameters of 6.0 nm (standard deviation, SD=1.3 nm) and 5.7 nm (SD=1.4 nm), respectively, were formed. The results indicate that the method can be utilized as a general and economically viable approach for the synthesis of metal and semiconductor quantum dots in environmentally benign supercritical carbon dioxide.
authors.affiliation: Supercritical Fluid Research Center, National Institute of Advanced Industrial Science and Technology, Miyagino-ku, Sendai 983-8551, Japan.
authors.forename: Juncheng
authors.initials: J
authors.lastname: Liu
authors.forename: Poovathinthodiyil
authors.initials: P
authors.lastname: Raveendran
authors.forename: Zameer
authors.initials: Z
authors.lastname: Shervani
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Ikushima
authors.forename: Yukiya
authors.initials: Y
authors.lastname: Hakuta
mesh_terms: D002245:Carbon Dioxide / Q000737:chemistry*; D004143:Dioctyl Sulfosuccinic Acid / Q000737:chemistry*; D004655:Emulsions / Q000737:chemistry; D007454:Iodides / Q000138:chemical synthesis* / Q000737:chemistry; D049329:Nanostructures / Q000737:chemistry*; D010316:Particle Size; D045663:Quantum Dots; D012666:Semiconductors; D012834:Silver / Q000737:chemistry*; D018030:Silver Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D014867:Water / Q000737:chemistry
chemical_list: D004655:Emulsions; D007454:Iodides; D018030:Silver Compounds; D014867:Water; D004143:Dioctyl Sulfosuccinic Acid; D002245:Carbon Dioxide; D012834:Silver; C030584:silver iodide