Electrical and optical characteristics of surface treated ZnO nanotubes

► ZnO nanotubes were formed onto an ITO glass and were surface treated. ► Photoluminescence and fluorescence imaging for ZnO nanotubes showed blue emission. ► Surface treated samples that showed green emissions. ► Lifetime measurements showed higher excitonic times in surface treated samples. ► Conductance measurements showed significant improvement for the treated samples.