title: Oxygen-assisted unidirectional growth of CdSe nanorods using a low-temperature redox process.
abstract: The role of oxygen in directing the low temperature (125 degrees C), redox-assisted, unidimensional and unidirectional growth of CdSe nanocrystals (NCs) was investigated. In the presence of oxygen, CdSe quantum dots grow selectively along their c axis with little to no change in their width. Reduction of oxygen in the growth medium results in three-dimensional growth. Moreover the one-dimensional growth was found to occur only from one of the two inequivalent polar (0001) facets, as supported by the seeded growth of Cd(x)Hg(1-x)Se onto CdSe seeds. This is in agreement with density functional theory simulations, which indicate that due to selective oxygen passivation growth can occur only along the [0001] direction. The ability to control seeded NC growth with respect to morphology and directionality opens new possibilities toward the low temperature synthesis of complex nanostructures.
authors.affiliation: Nanomaterials Optoelectronics Laboratory (NOEL), Polymer Program, University of Connecticut,Storrs, Connecticut 06269-3136, USA.
authors.forename: Jonathan D
authors.initials: JD
authors.lastname: Doll
authors.forename: Ghanshyam
authors.initials: G
authors.lastname: Pilania
authors.forename: Ramamurthy
authors.initials: R
authors.lastname: Ramprasad
authors.forename: Fotios
authors.initials: F
authors.lastname: Papadimitrakopoulos
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry*; D003080:Cold Temperature; D003460:Crystallization; D053768:Metal Nanoparticles / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission / Q000379:methods; D008956:Models, Chemical; D036103:Nanotechnology / Q000379:methods*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*; D045663:Quantum Dots; D018036:Selenium Compounds / Q000737:chemistry*; D013696:Temperature
chemical_list: D019187:Cadmium Compounds; D018036:Selenium Compounds; C058667:cadmium selenide; D010100:Oxygen