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The switching between the high and low resistance states in vacuum is accompanied by the reversible shift of the surface Fermi level.
Adsorption processes lead to a shift of the surface plasmon resonance which is in the thin film limit directly proportional to the corresponding mass coverage.
The coupling between flakes and nanoparticles lead to optical changes upon exposure to different gases: in particular, we observed a shift of the surface plasmon resonance band in presence of both reducing and oxidizing gases.
The total transmittance and reflectance spectra of the TiO2 and TiO2 Au composite layers are complemented by the Mie calculations, showing that the red shift of the surface plasmon resonance band from 570 to 620 nm is associated with the increase in the refractive index of the TiO2 matrix.
When gold nanoparticles approach each other and aggregate, the colour changes from red to blue because of the shift of the surface plasmon band to longer wavelength.
Also, charge transfer from Au nanoparticles to graphene resulted in a decrease in electron density which eventually contributes to the red shift of the surface plasmon absorption [23].
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The relative tangential shift of the surfaces arises within the intercontact gap due to the action of the tangential stress.
The freshly generated mercury atoms could strongly be bonded on the silver surface to form a solid amalgam-like structure, which could be accounted for the slight blue shift of the surface-plasmon absorption band of silver nanoparticles.
While a red-shift of the surface plasmon band occurs in case of AuNP-citrate, a blue-shift is found for AuNP-MDA when the temperature is increased above the PNIPAM's volume phase transition temperature.
The selective sensing signal through the electrostatic interaction between the DTSQ dye and the Ag+ metal cation was effectively transduced to the refractive index (RI) change corresponding to shifts of the surface plasmon resonance (SPR) angle.
Compared with the conventional nanospheroids [3], nanoprisms exhibit a large red-shift of the surface plasmon resonance.
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