title: The preparation of anisotropic hybrid nanostructures based on CdSe and CdS by the ligand combination method.
abstract: CdSe and CdS nanoparticles (NPs) are type I II-VI semiconductor materials with excellent optical properties. Usually various shapes of these NPs show a strong emission only from a CdSe or CdS single domain, while the emission from a CdSe core combined with a CdS shell is effectively suppressed due to the ultrafast hole relaxation from the CdS shell into the CdSe core. Therefore, the design and synthesis of heteronanostructures based on CdSe or CdS is of paramount importance in designing the ways of integrating these useful semiconductor materials into complex hybrid structures. Here we demonstrate the ligand-combination inducing growth method to prepare anisotropic core-shell (semiconductor-semiconductor) heteronanostructures, as well as anisotropic Au-semiconductor heteronanostructures. The NPs' anisotropic shape was confirmed by tilting a grid in TEM and their elemental composition was ascertained using EDX mapping in STEM mode. Furthermore, the photoluminescence excitation spectra were studied showing potential applications based on their unique optical properties. We believe that the mechanism investigation, the synthetic control, the obtained novel hybrid nanostructures and their optical properties will open doors to future studies on heterostructures based on semiconductors.
authors.affiliation: Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore 637371. xiaohui@illinois.edu and Department of Materials Science and Engineering, University of Illinois, Urbana, Illinois 61801, USA.
authors.forename: Xiaohui
authors.identifier: http://orcid.org/0000-0001-7713-1373
authors.initials: X
authors.lastname: Song
authors.affiliation: Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore 637371. xiaohui@illinois.edu.
authors.forename: Kamysbayev
authors.initials: K
authors.lastname: Vladislav
authors.affiliation: Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore 637371. xiaohui@illinois.edu.
authors.forename: Cuicui
authors.initials: C
authors.lastname: Liu
authors.affiliation: Division of Chemistry and Biological Chemistry, Nanyang Technological University, Singapore 637371. xiaohui@illinois.edu.
authors.forename: Weichang
authors.initials: W
authors.lastname: Xu