title: Facile hydrothermal synthesis and observation of bubbled growth mechanism in nano-ribbons aggregated microspherical Covellite blue-phosphor.
abstract: Well uniform microspheres of phase pure Covellite were synthesized through a simple hydrothermal approach using poly vinyl pyrrolidone (PVP) as surfactant. The micro-spheres were constituted of numerous self-organized knitted nano-ribbons of ∼ 30 nm thickness. The effect of conc. PVP in the hydrothermal precursor solution on the product morphology was investigated. Based on the out-coming product micro-architecture a growth mechanism was proposed which emphasized bubbled nucleation inside the hydrothermal reactor. In a comparative study on linear optical properties, enhancement of luminescent intensity was observed for nano-ribbon clung microspheres rather than that of agglomerates of distorted particles, which may be attributed to better crystallinity as well as reduced surface defects and ionic vacancies for ribbon-like nano-structures.
authors.affiliation: Materials Research Center, Indian Institute of Science, India560012.
authors.forename: Nirupam
authors.initials: N
authors.lastname: Banerjee
authors.forename: S B
authors.initials: SB
authors.lastname: Krupanidhi
mesh_terms: D003116:Color; D003300:Copper / Q000737:chemistry*; D008163:Luminescent Measurements; D008855:Microscopy, Electron, Scanning; D008863:Microspheres; D049329:Nanostructures / Q000737:chemistry*; D055620:Optical Phenomena; D011205:Povidone / Q000737:chemistry; D013501:Surface-Active Agents / Q000737:chemistry; D013696:Temperature
chemical_list: D013501:Surface-Active Agents; D003300:Copper; D011205:Povidone; C017846:cupric sulfide