Effect of hydrothermal time on the growth of ZnO nanorods on Printed Circuit Board substrates
We report the direct growth of high-quality, high-density and well-aligned ZnO nanorods on cost-effective printed circuit board substrates (PCBs)by a seedless hydrothermal method. It was shown that byimplementing a galvanic cell structure in a saturated aqueous solution of zincnitrate hexahydrate (Zn[NO3]2•6H2O) and hexamethylenetetramine (C6H12N4), it can support the vertical grown of ZnO and significantly reduce the hydrothermal time. The effect of hydrothermal time on the surface morphology and the crystallinity of the synthesized ZnO nanorods werestudiedand discussed to clarify the growing mechanism of ZnO NRs by usingscanning electron microscopy (SEM), X-ray diffraction (XRD), Raman, and photoluminescence spectroscopy (PL).