Defect Engineering and Hydrogen Bronze Formation in α-MoO₃ Crystals by Hydrogen Implantation

Area of Science:

• Materials Science
• Solid State Physics
• Nanotechnology

Background:

• α-MoO₃ is a promising material with tunable properties.
• Controllable hydrogen incorporation is key to modifying molybdenum trioxide.
• Defect engineering offers pathways for novel material functionalities.

Purpose of the Study:

• To introduce ion implantation as a method for hydrogen incorporation in α-MoO₃.
• To investigate the resulting phase transformations and defect structures.
• To correlate structural changes with electrical property modifications.

Main Methods:

• Ion implantation with varying ion fluence.
• High-resolution X-ray diffraction (HRXRD) for structural analysis.
• Raman spectroscopy and transmission electron microscopy (TEM) for phase and morphology confirmation.

Main Results:

• Formation of type-I H_xMoO₃ phases below the implanted layer.
• Gradual lattice expansion and defect-induced distortion observed.
• Reversible phase transformation upon annealing and orders-of-magnitude increase in electrical conductivity.

Conclusions:

• Ion implantation is a precise method for hydrogen incorporation and defect engineering in α-MoO₃.
• The formation of H_xMoO₃ phases significantly enhances electrical conductivity.
• This technique provides a versatile route for tailoring functional properties of molybdenum trioxide materials.