One-step formation of core-shell sulfide-oxide nanorod arrays from a single precursor

Yi Feng Lin*, Yung-Jung Hsu, Shih Yuan Lu, Wei Shan Chiang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Densely packed and well-aligned coaxial (core-shell) CdS-CdO and ZnS-ZnO nanorod arrays were prepared with a one-step, non-catalytic, template-free metalorganic chemical vapour deposition (MOCVD) process by using single-source molecular precursors Cd(O-EtXan)2 and Zn(O-EtXan)2, respectively (O-EtXan ≤ S2COCH2CH3). Data from pyrolysis gas chromatography/mass spectrometry of the precursors revealed the sequence of formation, namely sulfide core first and oxide shell later, with the first formed sulfide nanorods serving as the template for subsequent insitu oxide shell coating. The coaxial CdS-CdO and ZnS-ZnO nanorod arrays were formed at collection temperatures of 180 and 200 °C, respectively. At a slightly higher collection temperature of 250 °C, coaxial ZnS-ZnO nanowires were also obtained. The coaxial nanostructure was characterized and confirmed with high-resolution transmission electron microscopy. In a photoluminescence study, near band edge emissions at around 530nm, a composite emission of the two near band edge emissions of 524nm of CdS and 551nm of CdO, were observed for the coaxial CdS-CdO nanorod sample, while defect-induced emissions at around 470nm were observed for both coaxial ZnS-ZnO nanorod and nanowire samples. A more stable oxide shell not only protects the sulfide core but also provides possible surface passivation beneficial to enhanced photoluminescence. The present work demonstrates the feasibility of growth of coaxial one-dimensional nanostructures from single-source precursors that contain all the necessary constituent elements in one compound.

Original languageEnglish
Article number040
Pages (from-to)4773-4782
Number of pages10
JournalNanotechnology
Volume17
Issue number18
DOIs
StatePublished - 28 Sep 2006

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