Highly Sensitive Impact Sensor Based on PVDF-TrFE/Nano-ZnO Composite Thin Film

Area of Science:

• Materials Science
• Polymer Science
• Nanotechnology

Background:

• Polyvinylidene fluoride-trifluoroethylene (PVDF-TrFE) offers flexibility and easy processing for piezoelectric applications.
• PVDF-TrFE exhibits lower piezoelectricity compared to pure PVDF, necessitating composite materials.
• Enhancing PVDF-TrFE piezoelectricity is crucial for advanced sensor development.

Purpose of the Study:

• To investigate the impact of nano-zinc oxide (ZnO) doping concentration on PVDF-TrFE piezoelectric films.
• To optimize the composition of PVDF-TrFE/nano-ZnO composites for improved sensing characteristics.
• To determine the optimal nano-ZnO doping range for enhanced piezoelectric sensor performance.

Main Methods:

• Preparation of PVDF-TrFE/nano-ZnO thin films using spin coating.
• Characterization of nano-ZnO dispersion and β-phase crystallinity via SEM and XRD.
• Measurement of piezoelectric strain constants, dielectric constants, and sensor output under impact.

Main Results:

• Nano-ZnO doping increased both piezoelectric strain and dielectric constants in PVDF-TrFE films.
• Film morphology and β-phase crystallinity were influenced by nano-ZnO content.
• A PVDF-TrFE/nano-ZnO sensor with 7.5% doping showed a 5.5-fold increase in output voltage compared to pure PVDF-TrFE.

Conclusions:

• Nano-ZnO doping is an effective strategy to enhance the piezoelectric properties of PVDF-TrFE.
• The optimal doping range for nano-ZnO in PVDF-TrFE is approximately 4-10% for superior sensor performance.
• These findings pave the way for developing high-performance piezoelectric sensors based on PVDF-TrFE/nano-ZnO composites.