title: Reductant-free colloidal synthesis of near-IR emitting germanium nanocrystals: role of primary amine.
abstract: High temperature colloidal synthesis without using hazardous reducing agent is demonstrated here to develop a straight forward pathway for synthesizing near-IR (NIR) light emitting germanium nanocrystals (Ge NCs). The NCs were prepared by heating a mixture of germanium (II) iodide and organoamine. This article presents an important role of the primary amine which serves as a reducing agent as well as an inhibitor against oxidation by comparing with the tertiary amine. Interestingly, the difference in chemical reactivity between each amine causes the difference in major structural phase of the products. An efficient route to produce NIR light emitting Ge NCs is demonstrated.
authors.forename: Batu
authors.initials: B
authors.lastname: Ghosh
authors.forename: Makoto
authors.initials: M
authors.lastname: Ogawara
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Sakka
authors.forename: Naoto
authors.initials: N
authors.lastname: Shirahata
mesh_terms: D000588:Amines / Q000737:chemistry; D003102:Colloids / Q000737:chemistry*; D005857:Germanium / Q000737:chemistry*; D007259:Infrared Rays; D008024:Ligands; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*; D055095:Optics and Photonics; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D013499:Surface Properties; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D000588:Amines; D003102:Colloids; D008024:Ligands; D005857:Germanium; C008703:oleylamine