Precise Determination of Quantum Size Effect, Reactivity Size and Energy Levels of CdSe Nanoparticles Using Egypt Pyramids Model for Nanotechnology

Nowadays, nanotechnology produces a variety of materials and devices, which are important for different applications. However, without a predictive successful model, it takes much more effort, money, and time to get the desired structure suitable for a certain application. Therefore, we aim to apply a new model called Egypt Pyramids Model for Nanotechnology (EPMN) on the two structures of the semiconductor compound CdSe to explain its electronic structures and properties of bulk and nanostructures. Here we show that by applying EPMN on CdSe, the quantum size effect QSE and reactivity size RS were calculated to be 5.45, 2.42, 12.61, 5.6 nm for cubic and hexagonal CdSe, respectively. The observed peaks in absorption and photoluminescence spectra, 678, 529, 457, and 325 nm, match very well the calculated transitions 626.18, 527.59, 455.82, and 326.27 nm, respectively.