Complex wurtzite ZnSe microspheres with high hierarchy and their optical properties

Area of Science:

• Materials Science
• Nanotechnology
• Solid State Chemistry

Background:

• Wurtzite zinc selenide (ZnSe) is a semiconductor with significant optoelectronic applications.
• Controlling the morphology and structure of ZnSe is crucial for tuning its quantum-size effects.
• Traditional high-temperature synthesis methods can be energy-intensive and limit structural control.

Purpose of the Study:

• To develop a mild and effective method for synthesizing complex wurtzite ZnSe microspheres.
• To investigate the hierarchical fractal structure and quantum-size effects of the synthesized ZnSe.
• To explore the phase-transformation and shape-evolution processes during synthesis.

Main Methods:

• A mild solvothermal reaction using a diethylenetriamine (DETA)-deionized water (DIW) binary solution.
• Characterization of the resulting ZnSe microspheres' morphology, structure, and properties.
• In-situ or time-dependent studies to observe the synthesis process.

Main Results:

• Successfully synthesized complex wurtzite ZnSe microspheres with a hierarchical fractal structure.
• Observed strong quantum-size effects due to the unique nanostructure.
• Detailed the formation of microspheres from nanosheets and subsequent growth of flowerlike hierarchical structures from nanofibers.
• Monitored changes in nanosheet surface morphology and studied phase transformation and shape evolution with increasing reaction time.

Conclusions:

• The mild solvothermal approach offers an effective strategy for preparing ZnSe with controlled hierarchical structures.
• This method provides advantages over traditional high-temperature synthesis for tuning electronic and optical properties.
• The approach is potentially extendable to synthesize other semiconductor materials with novel morphologies and structures.