Frequency-dependent electric-field morphology

In the present study we have used a relatively new technique to study the morphology of these systems. Application of an alternating electric field to a multiphase morphology results in a frequency-dependent electric-field distribution due to the different permittivities and conductivities of dissimilar phases. Measured permittivity increases with decreasing frequency v = 0)/2ir, approaching a low frequency limit eQ as the field distribution transits from permittivity dominated to conductivity dominated. 

Nanobiosensors Noble-metal nanoparticles have a strong ultraviolet UV-vis absorption band that is not observed in the spectra of the bulk metals [113-115]. If the incident photon has a frequency that is close to the frequency that characterizes the collective oscillations of conduction electrons (plasmons) at the surface, resonant absorption can occur. The enhanced local electric fields near the surface of nanoparticles, which are dependent on the size and morphology of the nanoparticles, result in strong surface-sensitive contributions to UV-vis spectra. In Ref. [114], the authors review studies of this phenomenon of localized... 

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