Synthesis and structural characterization of Ga-ZnO nanodisk/nanorods formation by polymer assisted hydrothermal process

Synthesis and characterization of Ga-doped ZnO nanodisk and the formation of nanodisk/nanorod hybrid morphologies on AlN/Si substrate by polymer assisted one-pot hydrothermal process have been studied. The low concentration of Ga-ZnO sol (0.2 M) and optimized concentration (0.5 M) of Zinc sol is used to vary the morphology and physico-chemical properties. Varying amounts of Ga (1%–3%) doped ZnO nanodisks have also been synthesized and characterized. The morphology and structural properties were determined by field emission scanning electron microscopy (FESEM) and X-ray diffraction techniques. Ga-ZnO nanodisk shows major intense X-ray diffraction peak at ZnO (101). X-ray photoelectron spectroscopy (XPS) confirms the effect of gallium doping and variation in their surface property after Ga doping in ZnO. FESEM images clearly confirm the pure nanodisk formation for Ga-ZnO (0.5) at optimized ZnO concentration and hybrid nanodisk/nanorod formation obtained for Ga-ZnO (0.2) at lower ZnO concentration. The pure Ga-ZnO (0.5) nanodisk on AlN/Si thin film substrate showed effective response and fast recovery time towards UV light sensing in dark condition compared to low concentration route prepared Ga-ZnO (0.2)/AlN/Si sample.

Synthesis and characterization of Ga-doped ZnO nanodisk and the formation of nanodisk/nanorod hybrid morphologies on AlN/Si substrate by polymer assisted one-pot hydrothermal process. Ga-ZnO nanodisk forms the ordered structure and showing better UV light sensing activity compared to conventional routed prepared Ga-ZnO thinfilms.Figure optionsDownload as PowerPoint slideHighlights
► Ga-ZnO Nanodisk on AlN/Si substrate is prepared by polymer assisted hydrothermal process.
► Surface properties of Ga-ZnO nanodisk is revealed by Raman and photoelectron spectroscopy.
► Improved wide bang gap obtained for Ga-ZnO samples compared Ga-ZnO film.
► Higher UV light sensing activity was achieved for Ga-ZnO nanodisk compared to Ga-ZnO film.