Microstructuring of carbon nanotubes-nickel nanocomposite

Area of Science:

• Materials Science
• Nanotechnology
• Mechanical Engineering

Background:

• Micromirrors are crucial in various optical systems.
• Enhancing the mechanical stability of micromirror components is essential for long-term performance.
• Carbon nanotubes (CNTs) and nickel (Ni) are promising materials for advanced composites.

Purpose of the Study:

• To develop a novel electroplating method for synthesizing CNTs-Ni nanocomposite.
• To fabricate and evaluate the mechanical stability of a silicon micromirror using CNTs-Ni nanocomposite beams.
• To assess the suitability of CNTs-Ni nanocomposite for micromechanical element applications.

Main Methods:

• Developed a CNTs-Ni nanocomposite electroplating suspension by pre-treating CNTs for positive surface charge.
• Fabricated silicon micromirrors with beams made from the CNTs-Ni nanocomposite.
• Evaluated mechanical stability via resonant frequency analysis and long-term testing.

Main Results:

• Achieved a 2.4 wt% CNTs in the electroplated nanocomposite with a hardness of 18.6 GPa.
• Observed mechanical strengthening and increased shear modulus in the CNTs-Ni nanocomposite compared to pure Ni.
• Demonstrated minimal resonant frequency variation (approx. 0.25%) in the micromirror over a long-term test.

Conclusions:

• The novel electroplating method successfully produced a mechanically strengthened CNTs-Ni nanocomposite.
• The CNTs-Ni nanocomposite exhibits excellent mechanical stability, suitable for micromirror applications.
• This material shows significant potential for advanced micromechanical elements requiring high durability.