Abstract
Mechanical alloying through severe plastic deformation (SPD) was used to synthesize ultrasmall nanocrystals of (Cd0.3Zn0.7Se)with a diameter (d = 1.3 nm) after 20 hours milling time. A high-resolution electron microscope was (HRTEM) used to examine the mechanical deformation on the nanocrystals. The images reveal a bulk-like cluster structure without a distinctive regular shape. The atoms appear to be located entirely at the surface. The energy band-gap of the ultrasmall was determined to be 4.56 eV from UV-Vis absorption spectra.
Highlights
Ultrasmall or extremely small nanocrystals are particles with their size ranges from 1-2 nm (Chestnoy, Harris, & Hull, 1986)typically composed of (20 – 100) atoms
Their nonlinear optical can be exploited to fabricate optical switches and frequency converters(Remarks, 1991). Their unique broad-emission properties through the entire visible spectrum make them a strong candidate for biological labeling and energy-saving devices. They are used as solid-state lighting sources in the form of white-light-emitting diodes(WLEDs)(Dai, Duty, & Hu, 2010).Their potential applications in photovoltaic industries have been explored by shifting the energy levels to appropriately match the UV-visible spectrum without changing the main size(Teunis, Dolai, & Sardar, 2014)
We employ mechanical alloying through severe plastic deformation (SPD) for the synthesis of the ternary compound (CdZnSe)
Summary
Ultrasmall or extremely small nanocrystals are particles with their size ranges from 1-2 nm (Chestnoy, Harris, & Hull, 1986)typically composed of (20 – 100) atoms They are typically large molecules with exact atomic configurations rather than continuous lattice (Landes, Braun, & El-Sayed, 2001).They are termed “nanoclusters” because of the presence of tens to several thousands of atoms. We employ mechanical alloying through severe plastic deformation (SPD) for the synthesis of the ternary compound (CdZnSe) In this method, Intensive deformation under non-isothermal conditions generally occurs in highenergy milling devices(Hellstern, Fecht, Fu, & Johnson, 1989). The synthesis of the ultrasmall binary compound had been reported in CdTe nanocrystals using mechanical alloying This method is considerably cost-effective devoid of toxic chemical Experimental Procedure Elemental Cd, Zn, and Se powders with a purity of 99.9%were purchased from Alta Aesar. The high-resolution transmission electron microscopy (HRTEM) micrographs were obtained using (Tecnai G F20 Series) at a 200 kV accelerating voltage in dark-field modes
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
