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Crystal Growth: Principles of Crystallization01:25

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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Unique Growth Pathway in Solution-Solid-Solid Nanowires: Cubic to Hexagonal Phase Transformation.

Yi-Hsin Liu1, Ho-Ying Chen1, Hsiu-Fang Fan2

  • 1Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan.

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Summary
This summary is machine-generated.

We developed a low-temperature method to synthesize zinc sulfide (ZnS) nanowires and heterostructures using thermal decomposition. This facile pathway enables multicolor photoluminescence for advanced semiconductor applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid-State Chemistry

Background:

  • Solution-solid-solid (SSS) nanowire synthesis often relies on ion diffusion catalyzed by superionic materials like silver sulfide (Ag2S).
  • Controlled synthesis of semiconductor nanowires with specific crystal structures and heterostructures is crucial for advanced electronic and optoelectronic devices.

Purpose of the Study:

  • To develop a low-temperature, facile synthesis pathway for zinc sulfide (ZnS) nanowires and cadmium sulfide-ZnS (CdS-ZnS) heterostructures.
  • To investigate the growth mechanism, including phase transformation and oriented attachment, for 1D nanostructures.
  • To characterize the structural and optical properties of the synthesized heterostructures, focusing on their photoluminescence characteristics.

Main Methods:

  • Synthesis of single-crystalline ZnS nanowires via thermal decomposition of a single-source precursor, zinc bis(diethyldithiocarbamate) [Zn(DDTC)2], at temperatures ranging from 120-200 °C.
  • Formation of CdS-ZnS heterostructured nanowires by introducing a cadmium precursor, cadmium bis(diethyldithiocarbamate) [Cd(DDTC)2].
  • Structural and optical characterization using photoluminescence (PL), 2D photoluminescence excitation (PLE), and time-correlated single-photon counting (TCSPC) techniques.

Main Results:

  • Successfully synthesized single-crystalline ZnS nanowires with wurtzite crystal structure and defined diameters (5-10 nm).
  • Observed a phase transformation from zinc blende to wurtzite during synthesis, with a proposed three-step growth mechanism involving oriented attachment and epitaxial growth.
  • Fabricated CdS-ZnS heterostructures exhibiting multicolor photoluminescence spanning 450-800 nm, attributed to exciton recombination with multiple lifetimes (0.5-12 ns).

Conclusions:

  • Demonstrated a unique and mild low-temperature pathway for SSS nanowire and heterostructure synthesis under atmospheric conditions.
  • The controlled phase transformation and growth mechanism facilitate the formation of 1D nanostructures and complex heterojunctions.
  • The synthesized ZnS and CdS-ZnS heterostructures show promising broadband emission properties for optoelectronic applications.