Rapid Synthesis of Core/Shell ZnS:Mn/Si Nanotetrapods by a Catalyst-Free Thermal Evaporation Route

    Authors

    S. Kar;S. Biswas

    Comments

    Authors: contact us about adding a copy of your work at STARS@ucf.edu

    Abbreviated Journal Title

    ACS Appl. Mater. Interfaces

    Keywords

    core/shell nanostructures; tetrapods; zinc sulfide; photoluminescence; ONE-DIMENSIONAL NANOSTRUCTURES; SEMICONDUCTOR NANOCRYSTALS; NANOWIRE; HETEROSTRUCTURES; OPTICAL-PROPERTIES; CORE-SHELL; PHOTOLUMINESCENCE; PROPERTIES; SOLVOTHERMAL PROCESS; MAGNETIC-PROPERTIES; EMISSION; PROPERTIES; ZNS NANORIBBONS; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary

    Abstract

    We report the fabrication of a hybrid all semiconductor core/shell nanotetrapod structure consisting of crystalline ZnS: Mn core and amorphous Si shell for the first time. The nanostructures were produced via a catalyst-free rapid thermal evaporation technique, core/shell nanotetrapods were formed in two steps: (I) Formation of the crystalline ZnS:Mn tetrapods and (II) simultaneous surface adsorption of the in situ formed Si vapor species providing the amorphous shell. Crystalline tetrapod formation was guided by the formation of cubic structured ZnS octahedrons with four active (1 1 1) polar growth planes, which served as the favored growth site for the four wurtzite structured legs of the tetrapods. Choice of chloride salt as the source of dopant ion was crucial for the in situ generation of Si vapor. At elevated temperature. chloride salt reacted with the sulfur vapor to produce S2Cl2 gas that etched the Si wafers, generating Si vapor, suppression of the surface-state-related blue emission was observed in the core/shell structures chat clearly supported the formation of a shell layer. Elimination of the surface states ensured efficient energy transfer to the dopant Mn ionic state, resulting in the strong orange emission via T-4(1)-(6)A(1) electronic transition.

    Journal Title

    Acs Applied Materials & Interfaces

    Volume

    1

    Issue/Number

    7

    Publication Date

    1-1-2009

    Document Type

    Article

    Language

    English

    First Page

    1420

    Last Page

    1426

    WOS Identifier

    WOS:000268310800011

    ISSN

    1944-8244

    Share

    COinS