title: ZnS nanocrystals and nanoflowers synthesized by a green chemistry approach: rare excitonic photoluminescence achieved by the tunable molar ratio of precursors.
abstract: In the present work, we demonstrated a simple and green synthesis route for shape-controlled ZnS nanocrystals, where only environmentally benign chemicals, namely sulfur, zinc oxide and olive oil, were employed. By controlling the experimental conditions, we were able to tune the band edge and trap state photoluminescences of ZnS nanocrystals and obtain pure excitonic photoluminescence that was rarely observed in literature. The trap state emission was derived from sulfur vacancies and would be eliminated when an excess of sulfur was used during the synthesis. Additionally, the morphology of ZnS nanocrystals could be tuned to appear like flowers, where the formation mechanism was systematically discussed.
authors.affiliation: State Key Laboratory of Superhard Materials, Jilin University, 2699 Qianjin Street, Changchun, Jilin Province 130012, PR China.
authors.forename: Ningru
authors.initials: N
authors.lastname: Xiao
authors.forename: Quanqin
authors.initials: Q
authors.lastname: Dai
authors.forename: Yingnan
authors.initials: Y
authors.lastname: Wang
authors.forename: Jiajia
authors.initials: J
authors.lastname: Ning
authors.forename: Bingbing
authors.initials: B
authors.lastname: Liu
authors.forename: Guangtian
authors.initials: G
authors.lastname: Zou
authors.forename: Bo
authors.initials: B
authors.lastname: Zou
mesh_terms: D055772:Green Chemistry Technology / Q000379:methods*; D049449:Luminescence; D046529:Microscopy, Electron, Transmission; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D000069463:Olive Oil; D010938:Plant Oils / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D013440:Sulfides / Q000737:chemistry*; D017967:Zinc Compounds / Q000737:chemistry*; D015034:Zinc Oxide / Q000737:chemistry
chemical_list: D000069463:Olive Oil; D010938:Plant Oils; D013440:Sulfides; D017967:Zinc Compounds; C031238:zinc sulfide; D015034:Zinc Oxide