Will there be a change in bandgap energy of AgNP exposed under blue, red and visible wavelengths of light?
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Yes, there can be a change in the bandgap energy of silver nanoparticles (AgNP) when exposed to different wavelengths of light, including blue, red, and visible light. This phenomenon is often referred to as "plasmonic tuning" and is based on the interaction between the incident photons and the conduction electrons in the nanoparticles.
When light interacts with metallic nanoparticles like silver, it can induce collective oscillations of free electrons known as surface plasmon resonance (SPR). The resonance frequency of these oscillations depends on the size, shape, and composition of the nanoparticles, as well as the surrounding medium.
In the case of silver nanoparticles, the SPR typically occurs in the visible spectrum, with different resonance peaks corresponding to different sizes and shapes of nanoparticles. When AgNPs are exposed to light, especially in the blue, red, and visible wavelengths, the energy of the incident photons can excite the electrons in the nanoparticles to higher energy levels, leading to changes in the bandgap energy.
Specifically: Blue light, which has higher energy photons, can induce stronger excitations in the electrons, leading to a blue shift in the SPR peak and a decrease in the bandgap energy.
Red light, with lower energy photons, may induce weaker excitations, resulting in a red shift in the SPR peak and a slight increase in the bandgap energy.
Visible light, encompassing a range of wavelengths between blue and red, can induce intermediate effects depending on the specific characteristics of the nanoparticles.
Overall, the interaction between light and silver nanoparticles can modulate their electronic properties, including the bandgap energy, through the phenomenon of plasmonic tuning. These effects are of significant interest in various applications, including sensing, catalysis, and optoelectronic devices.
Nice to hear from you. Plasmonic tuning due to LSPR is ok, but how it changes the bandgap energy which is based on crystalline st. Any reference that shows the changes in bandgap energy with different wavebands of light.