Figure 1From: Fabrication and characterization of WO3/Ag/WO3 multilayer transparent anode with solution-processed WO3 for polymer light-emitting diodesSynthesis of WO 3 nanoparticles from aqueous solution of Na 2 WO 4 . Surface of WO3 layer was investigated through field emission scanning electron microscope (FESEM).Back to article page