Nanoscale materials in chemistry 3D 2D Energy Energy Energy Energy Bulk Quantum Well Quantum Wire Quantum Dot FIGURE 2.5 Formation of a zero-dimensional (0D)quantum dot by the fommal reduction of dimensions,correlating with the continuing discretization of the energy states. Cited from Nanoscale Materials in cCemistry;Edited by Kenneth J.KlabuncNanoscale materials in chemistry Cited from Nanoscale Materials in cCemistry; Edited by Kenneth J. Klabunde