Effect of NaOH concentration to the growth of ZnO nanorod arrays / A. S. Ismail ...[et al.]

Tin (Sn)-doped zinc oxide (ZnO) films were
synthesized using sol-gel immersion method where different
concentration of sodium hydroxide (NaOH) were used during the
synthesis process. The structural, optical, and current-voltage (IV) characteristics of the films were investigated. From the
FESEM images, it is observed that the density of the nanorods
improved with the increment of NaOH concentrations. The
average diameters of the nanorods reduced from 80 nm to 67 nm
after the concentrations of NaOH were increased from 0 to 0.01
M. The optical measurement indicates that the synthesized films
possessed good transmittance properties. 0.01 M of NaOH
produced the highest bandgap energy of 3.26 eV compared to
other films. In case of electrical properties measurement, 0.01 M
NaOH produced the lowest resistance film. These results indicate
that the addition of NaOH into acidic-based solution is crucial to
control the growth of nanostructures.