Anisotropy Property of CdS and PbS Quantum Dots Encapsulated in Silica Film with Uniformly Oriented Mesochannel

In this paper, hybrid film of mesoporous silica film with oriented mesochannels and semiconductor quantum dot has been prepared. Encapsulation of CdS and PbS within the oriented mesochannels leads to a regular arrangement at the macro scale. The hybrid film thus obtained showed remarkable anisotropic photoelectronic properties due to the confinement effect of the oriented mesochannels. Furthermore, due to the independence of the orientations of the mesochannels on the substrate, bilayer films containing both CdS and PbS could be prepared. This design has allowed an extension of the range of light absorption by the thin film as well as an amplification of the response to external photoelectronic effects. Such a hybrid film may prove useful in the design of anisotropic electrodes and electronic nanodevices.