The subband energies vary with d at fixed r2. Electronic subband energy, E1l and E2lfor l = 0, 1, and 2, as a function shell thickness d of hollow nanosphere for outer radius r2 = 100 nm in (a) and r2 = 25 nm in (b). The inset in (b) shows the energy difference in different l states.
Xiao et al. Nanoscale Research Letters 2012 7:578 doi:10.1186/1556-276X-7-578