title: Morphology-dependent stimulated emission and field emission of ordered CdS nanostructure arrays.
abstract: Highly ordered CdS nanostructure arrays were successfully fabricated via a simple two-step metal-organic chemical vapor deposition process. Both stimulated emission and field-emission measurements were carried out in an attempt to understand the correlation between the morphologies, alignments, and emission performances of five ordered CdS nanostructure array types (well-aligned truncated nanocones, nanorods, cleft nanorods, quasi-aligned nanowires, and nanowires). The 1D CdS nanostructures of various types displayed notable differences in stimulated and field-emission performances. The stimulated emission strongly correlated with the structure alignment: the better the alignment, the lower the threshold. Both of the alignments and aspect ratios greatly affected the field-emission properties; the CdS emitters of higher aspect ratio and better alignment exhibited better field-emission performance. Thus the well-aligned CdS nanorod arrays had the lower threshold for stimulated emission, and quasi-aligned nanowire arrays produced the higher field-emission current and possessed the lower turn-on fields.
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.
authors.forename: Tianyou
authors.initials: T
authors.lastname: Zhai
authors.forename: Xiaosheng
authors.initials: X
authors.lastname: Fang
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Bando
authors.forename: Qing
authors.initials: Q
authors.lastname: Liao
authors.forename: Xijin
authors.initials: X
authors.lastname: Xu
authors.forename: Haibo
authors.initials: H
authors.lastname: Zeng
authors.forename: Ying
authors.initials: Y
authors.lastname: Ma
authors.forename: Jiannian
authors.initials: J
authors.lastname: Yao
authors.forename: Dmitri
authors.initials: D
authors.lastname: Golberg