Electron beam stimulated formation of CdS nanoparticles within calixarene Langmuir–Blodgett films
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چکیده
Two possible types of cadmium sulphide ~CdS! nanostructures can be formed within Langmuir– Blodgett ~LB! films of calixarene Cd salt as a result of exposure to H2S gas: nanoclusters with the size of about 1.5 nm or two-dimensional planes with the thickness of about 1.7 nm. Transmission electron microscopy and electron diffraction studies on calixarene/CdS LB films show that CdS particles are not present in the fresh samples at the beginning, but they are gradually formed under exposure to a high energy electron beam. A blueshift of the first exciton absorption band and an increase of the extinction coefficient, caused by exposure to H2S gas, were found with UV-visible optical spectroscopy and surface plasmon resonance, respectively. © 2000 American Institute of Physics. @S0021-8979~00!07015-8#
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تاریخ انتشار 2000