Will the structure of CdS nanoparticles deposited on a substrate be affected if the substrate is heated to temperatures up to 450-500 Celsius? Or will the structure remain as it is?
Dear Saavedra,
Yes, CdS structure and shape is affected by heating at high temperature.
Nano-particle size increases with temperature increases with different shape. In my research work, decomposition temperature increases shape of metal oxide particles changed from spherical to rod shape. Hence, saturation magnetization (emu/g) also increases.
Let me rephrase the question. What Im really interested on is if there is a nanocrystalline semiconductor (QD) that won't be oxidized/decompose at those temperatures in the presence of oxygen?
Dear Valeria
I have observed CdS nano crystalline film undergo changes on thermal annealing in S 2 and Ar atmospheres, the CdS changes from the metastable zinc blende phase to a stable wurtzite one. The cubic‐to‐hexagonal transition temperature is 370 °C. Also there will be change in optical properties. In case of CdS quantum dots upon annealing they may diffuse into each other and may loose quantum confinement apart from phase change.
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