Photonics of new metal-alkanoate composites contained semiconductor nanoparticles

摘要

The absorption and photolumincscence spectra of semiconductor CdS and CdSe nanoparticles (NPs) in cadmium alkanoates anisotropic glasses have been studied. NPs are chemically synthesized in thermotropic ionic liquid crystalline (TILC) smectic A phase of cadmium alkanoates which are used as nanoreactors. The glassy nanocomposites are obtained by rapid cooling the TILC to room temperature. In the new cadmium alkanoates matrices, the CdS and CdSe NPs have a small dispersion of their sizes, their shape is nearly spherical, they are stable over time, and they are ordered in glassy smectic A matrix. The thermo-optical nonlinearity of the cadmium octanoate nanocomposites contained CdSe NPs is characterized by extremely large values of the nonlinear refractive index, n_2, under relatively low-powered laser pulses.