High performance triboelectric nanogenerators with aligned carbon nanotubes

Area of Science:

• Materials Science
• Nanotechnology
• Energy Harvesting

Background:

• Triboelectric nanogenerators (TENGs) are crucial for harvesting mechanical energy.
• The performance of TENGs heavily relies on the properties of their friction layers.
• Material selection and surface modification are key to enhancing TENG device performance.

Purpose of the Study:

• To develop an effective dielectric layer for TENGs using aligned carbon nanotubes (CNTs) embedded on a polydimethylsiloxane (PDMS) surface.
• To enhance the electron generation capacity and stretchability of the TENG's friction layer.
• To investigate the impact of precisely controlled CNT length and properties on TENG performance.

Main Methods:

• Embedding aligned carbon nanotubes (CNTs) on a polydimethylsiloxane (PDMS) surface to create a stretchable dielectric layer.
• Fabricating and testing a CNT-PDMS based TENG, comparing its performance to TENGs with directly doped PDMS/multiwall carbon nanotubes.
• Evaluating the stability, superhydrophobicity, and sheet resistance of the fabricated CNT-PDMS film.

Main Results:

• The fabricated CNT-PDMS TENG demonstrated a significant enhancement in output voltage (150 V) and current density (60 mA m^-2), representing 250% and 300% improvements, respectively.
• The TENG achieved a maximum power density of 4.62 W m^-2 and exhibited superior stability over 12,000 cycles.
• The aligned CNT-PDMS film displayed superhydrophobicity (154°) and good sheet resistance (280 Ω sq^-1).

Conclusions:

• The developed aligned CNT-PDMS film serves as a highly effective positive triboelectric layer for flexible and stretchable TENGs.
• This stretchable film can be universally paired with various polymeric materials for diverse TENG applications.
• The study presents an effective strategy for structure design to advance flexible and stretchable nanogenerator technology.