Figure 6.

Plan-view SEM images of ZnO nanostructures. They are grown (a) without surfactants, (b) with 0.1 ml PEI, and (c) with 2.5 mg of sodium citrate (per 40 ml of reaction solution), at 0.05 M, 80°C for 5 h. (d) PL spectra of ZnO nanostructures in (a), (b), and (c).

Dong et al. Nanoscale Research Letters 2013 8:378   doi:10.1186/1556-276X-8-378
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