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Solution-Processed 1D Wurtzite ZnS Nanostructures with Controlled Crystallographic Orientation and Tunable Band-Edge
Jing Cai1, Peifeng Liu1, Junyu Lei1
1School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|September 19, 2023
Summary
Researchers developed a new method to control the crystallographic orientation of 1D zinc sulfide (ZnS) nanostructures. This control enables tuning of their bandgap and optical properties for advanced semiconductor applications.
Area of Science:
- Materials Science
- Nanotechnology
- Solid-State Chemistry
Background:
- 1D compound semiconductor nanomaterials exhibit size, composition, and structure-dependent properties.
- Controlling crystallographic orientation in 1D zinc sulfide (ZnS) nanostructures is crucial for exploring anisotropic properties.
Purpose of the Study:
- To develop a solution-processed strategy for synthesizing 1D wurtzite (w-)ZnS nanostructures with controlled <002> and <210> crystallographic orientations.
- To investigate the influence of crystallographic orientation on the morphology, bandgap, and optical emission of 1D w-ZnS nanostructures.
Main Methods:
- Co-decomposition of copper dibutyldithiocarbamate (R2Cu) and zinc dibutyldithiocarbamate (R2Zn) precursors in oleylamine and 1-dodecanethiol mixed solvents.
- Proposed a solution-solid-solid (SSS)-Oriented growth mechanism involving oriented nucleation and SSS growth stages.
- Analyzed the dependence of crystallographic orientation on interfacial energy and ligand effects.
Main Results:
- Synthesized 1D w-ZnS nanostructures with specific <002> (nanorod) and <210> (nanobelt) orientations.
- Observed distinct morphologies: <002>-oriented nanorods enclosed with {110} facets and <210>-oriented nanobelts with wide (002) and narrow (110) facets.
- Demonstrated tunable bandgaps from 3.94 to 3.82 eV and tunable band-edge emission from ~338 to ~345 nm by varying crystallographic growth direction.
Conclusions:
- A controllable solution-processed strategy for oriented growth of 1D w-ZnS nanostructures was established.
- Crystallographic orientation significantly impacts the morphology, bandgap, and optical emission properties of ZnS nanostructures.
- The findings offer pathways for designing anisotropic semiconductor nanomaterials with tailored optoelectronic functionalities.
