title: Selective degradation of chemical bonds: from single-source molecular precursors to metallic Ag and semiconducting Ag2S nanocrystals via instant thermal activation.
abstract: Selective formation of metallic Ag and semiconducting Ag(2)S nanocrystals has been achieved via a modified hot-injection process from a single-source precursor molecule, Ag(SCOPh), which can potentially generate both [Ag] and [AgS] fragments simultaneously. When the precursor molecules are injected into a preheated reaction system at 160 degrees C, spherical Ag(2)S nanocrystals are directly obtained even without a molecular activator, such as alkylamines. Mixtures of Ag and Ag(2)S or pure metallic Ag nanocrystals are obtained if the precursor molecules are injected at lower than 160 degrees C or room temperature. These results are attributed to the direct transfer of thermal energies to precursor molecules, which are enough to dissociate S-C as well as Ag-S bonds simultaneously. Detailed characterizations about the produced nanocrystals have been performed using powder X-ray diffraction (XRD), transmission electron microscopy (TEM), as well as energy-dispersive X-ray (EDX) spectrum.
authors.affiliation: Department of Chemistry, Pohang University of Science and Technology, San 31, Hyoja-Dong, Nam-Gu, Pohang, South Korea.
authors.forename: Qun
authors.initials: Q
authors.lastname: Tang
authors.forename: Seok Min
authors.initials: SM
authors.lastname: Yoon
authors.forename: Hyun Jin
authors.initials: HJ
authors.lastname: Yang
authors.forename: Yoonmi
authors.initials: Y
authors.lastname: Lee
authors.forename: Hyun Jae
authors.initials: HJ
authors.lastname: Song
authors.forename: Hye Ryung
authors.initials: HR
authors.lastname: Byon
authors.forename: Hee Cheul
authors.initials: HC
authors.lastname: Choi