Nanoscale electrical properties of ZnO nanorods grown by chemical bath deposition

Abstract

Well-aligned zinc oxide nanorod arrays (ZNAs) synthesized using chemical bath deposition were fabricated on a gallium-doped zinc oxide substrate, and the effects of varying the precursor concentrations on the growth and nanoscale electrical properties of the ZNAs were investigated. The as-synthesized ZNAs were characterized using field-emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), conducting atomic force microscopy (CAFM), and scanning surface potential microscopy (SSPM). The FESEM and AFM images show that the growth rate in terms of length and diameter is highly sensitive to the precursor concentration. CAFM and SSPM analyses indicate that when concentrations of both the zinc acetate and hexamethylenetetramine solutions were 30 mM, the coverage percentages of the recordable and conducting regions on the ZNA surface were 48.3% and 0.9%, which is suitable for application in resistive random access memory devices.

Enhancement of ZnO Nanorods Properties Using Modified Chemical Bath Deposition Method: Effect of Precursor Concentration

“…The unexpected alternate in the aspect ratio may additionally be due to a clear distinction in average diameter and the average length of the ZnO NRs in each method of synthesis. The behavior aspect ratio variation in the absence of air bubbles is in good agreement with the previous studies [31,34,41]. From Figure 3c, we noticed that the higher aspect ratio is corresponding to the precursor concentration of 0.05 M. The ZnO NRs grown with higher aspect ratio created well-aligned ZnO NRs [37,38,54].…”

“…In addition, the obtained ZnO NRs had wurtzite hexagonal crystal structure and grown with c-axis [40]. The influence of different precursor concentrations (0.01-0.07 M) on the morphology, structure and nanoscale electrical properties of well-aligned ZnO NRs grown on gallium-doped ZnO substrate by CBD process was observed by Chen et al [41]. It was found that intensity; average length, and average diameter increased as the precursor concentrations are increased.…”

“…It was found that intensity; average length, and average diameter increased as the precursor concentrations are increased. The high aspect ratio was found when ZnO nanorods were grown at 0.05 M precursor concentration [41]. Abuelsamen et al demonstrated that the crystallinity and surface morphology of ZnO NRs were strongly affected by changing the concentration and had an effect on the UV photosensing [42].…”