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Zinc Oxide (ZnO) nanoparticles were synthesized by hydrothermal method under different conditions and studied various properties. FTIR studies proved the presence of ZnO bonding and purity of the samples. Grain size was found to be decreased with the increase of reaction temperature and increased with reaction time. TEM images show formation of nanorods under same reaction temperature, also nanoflowers and nanospheres for different temperatures. Intensity of luminescence peaks is found to be changed with variation in interplanar spacing. UV–vis spectra helped to identify the increased photon absorption in particles of bigger size. Change in bandgap value is also observed due to the difference in size of nanoparticles.

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The history of electrochemiluminescence (ECL) of Ru(bpy) as described in our paper was not entirely correct. We present our excuses for this and want to set the record straight here. Hercules and Lytle did not study the ECL of Ru(bpy) but its chemiluminescence in aqueous solution. After them, the group of Bard was the first to show ECL of Ru(bpy), first in nonaqueous and later in aqueous solution. 1,2 (1) Tokel, N. E.; Bard, A.