Band of the NPs

The position of the absorption band of the NP after irradiation was also found to depend on the nature of the organic substituents used in the hybrid matrix. 

This strong plasmon absorption and its sensitivity to the local environment have made Au NPs and nanomaterials attractive candidates as colorimetric sensors. Colorimetric response can be due to the metal particle aggregation, which affects the SPR band of the isolated particles due to plasmon coupling and induced dipoles. 

The physical and optical properties of the NPs used in this investigation are described in Table 6.1. The optical absorption properties of the ruthenium dye complex are also detailed in the table. It can be seen that there is good overlap between 7 of the pure silver and alloy NPs and the absorption band of the complex, while the gold NPs lie outside the absorption peak and are used as a negative control. The dependence of the excitation spectra of the dye complex on NP-dye distance is shown in Figure 6.14 for the case of the pure silver NPs. Also included in the figure is the excitation spectrum for the complex coated on the PEL layer in the absence of NPs. From Table 6.1, it can be seen that there is very good overlap between 7 of the silver NPs and the dye absorption band which constitutes the optimum plasmonic enhancement condition for the case of excitation enhancement. 

Table II. Summary of Band Model Resolutions of the Np(V) Hypersensitive...

In Reference 21 the optical absorption spectrum of an MgO powder is measured and a band observed at 4.6 eV is attributed to three-coordinated anions. Considering the electronic structure and morphology of the NPs what is the origin of the higher frequency band at 5.4 eV ... 

At the same time, it was not discovered the direct dependence between the width of the adsorption band of Ag-NPs on a half of its height (Al) and nanoparticles distribution per size M). Evidently, it is connected with the nonmonotonic change of the adsorption band of Ag-NPs at their size increasing [6], However, the all analyzed data are satisfactory described by the linear equation ... 

Figure 6.7 Influence of annealing temperature on the fluorescence bands of Si NPs (excitation at 345 nm).

The relatively large intensity of the 1585 cm" band in the np spectrum, therefore, can be attributed to at least one of these longer lived species. As an additional complication, the np spectrum is recorded from a sample containing dithionite which should significantly alter the electron back-transfer kinetics in the reaction center relative to the ps and cw cases. A similar qualitative analysis can be made of the cw RR data where yet a third set of concentrations and RR scattering conditions are used. 

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