NOEL

Characterizations and applications of nanomaterials

 

High-efficiency photo-electron conversion devices

Ultra-high sensitive CdS photodetector

Silicon-based broadband photodetector

Silicon-based solar cells

Organic solar cells

Semiconductor processes and nanofabrication

Characterizations and applications of nanomaterials

Light harvesting and light extraction

Optical analysis techniques

Eco-friendly devices and sensors

 

 


 

 

 

Active Modulation of Surface Plasmon Resonance Wavelengths by Applying an Electric Field to Gold Nanoparticle-Embedded Ferroelectric Films

In this study, we use organic chemical addition and phase-transfer methods to prepare lead zirconate titanate (PZT) composite films embed with large numbers of gold nanoparticles (Au NPs). The surface plasmon resonance (SPR) wavelength in the nanocomposite materials can be modulated cyclically through the application of an external electric field. The Au NPs are embedded homogeneously in the PZT matrix; the PZT crystal size and the metal particle size both increase upon increasing the annealing temperature. The Au/PZT nanocomposite film displays apparent piezoelectric properties in its ferroelectric hysteresis curve that can be used in the active modulation of the SPR wavelengths. The major factor influencing the shift in the SPR absorption in the Au/PZT nanocomposite films is the change in the refractive index of the host PZT matrix.

Schematic of organic chemical addition method of nanocomposite films.

Ferroelectric hysteresis curves of the PZT and Au/PZT nanocomposite films after annealing at 650 °C.

Simulated spectra of the Au/PZT nanocomposite films under various applied external electric fields, using the measured refractive indices of the PZT films.
 
 
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