instead a progressive energy blue-shift takes place for zso-7.7 and zso-4.0 due to smaller zno nps dimension the (absorption edge lines in fig 2 have been split to draw the tangents )and calculate the band gap energy in order to study the interaction between zno particles and sio and aiming to point out the si-o-zn bond formation solide state si sp mas si cp mas and h mas nmr investigations wers performed on zso-x samples