Abstract
Reduced graphene oxide/zinc oxide (RGO/ZnO) nanocomposites were synthesized by facile hydrothermal method; this method consists of exfoliation of graphite with modified Hummer's method and synthesis of (RGO/ZnO) nanocomposites using hydrothermal method. X-ray diffraction, TEM and FT-IR spectroscopy were used for structure morphological characterization. Optical properties of the samples were studied by measuring their optical absorbance. It can be concluded from XRD analysis that there are improvements of crystallinity associated with the increase of the crystallite size, as well as the increase in both of the (Zn-O) bond length and unit cell volume with the increase of ZnO ratio in RGO/ZnO nanocomposites. The morphological studies confirmed that the scale of ZnO particles is large and the size distribution is not uniform in samples of RGO/ZnO and that most particles have average size of about 9 nm while some particles even have larger size. The optical absorption spectra show that the excitonic peak of the as-prepared samples is red shifted from 268 nm to 376 nm for reduced grapheme oxide (RGO) with the increase of ZnO ratio, and the optical band gap changes from 2.39 for pure RGO to 3.34 eV for pure ZnO. The effect of UV irradiation on the optical absorption nanocomposites at different UV doses was carried out using UV lamp.
Highlights
zinc oxide (ZnO) nanomaterials are attractive candidates for fabricating biosensors, super capacitors, solar cells, and another several electronic devices because of their diverse range of nanostructures, high electron mobility, chemical stability, and electrochemical activity, high isoelectric points which promote enzyme adsorption, bio compatibility, and piezoelectric properties [1]
In the present investigation reduced graphene oxide synthesized by modified Hummer's method, Zinc oxide synthesized by hydrothermal method, and Reduced graphene oxide/zinc oxide (RGO/ZnO) nanocomposites were synthesized by hydrothermal method and various characterization techniques have been employed to investigate the structure, morphology and optical absorption spectra for the prepared samples
Reduced graphene oxide (RGO) powder and zinc acetate in different ratios as shown in table 1 are dissolved in water and stirred for 15 min, 1M of NaOH dropped wisely to the mixture until achieve pH= 10 and the white mixture was transferred into Teflon autoclave hydrothermal system for 24 h at 100 °C, the product powder was filtered and washed by distilled water and ethanol, dry at 100 °C
Summary
ZnO nanomaterials are attractive candidates for fabricating biosensors, super capacitors, solar cells, and another several electronic devices because of their diverse range of nanostructures, high electron mobility, chemical stability, and electrochemical activity, high isoelectric points which promote enzyme adsorption, bio compatibility, and piezoelectric properties [1]. Graphene which is a new important member in the family of carbon can be described as mono layer or a few layers of 2D planar sheet of sp hybridized carbon atoms arranged in a hexagonal lattice was first synthesized by modified Hummer's method [2]–[4]. It is a very good choice for electrode because of its characteristics, like excellent electrical conductivity, fast electron mobility, high surface area to volume ratio, and very good thermal and electrochemical properties [5]. In the present investigation reduced graphene oxide synthesized by modified Hummer's method, Zinc oxide synthesized by hydrothermal method, and RGO/ZnO nanocomposites were synthesized by hydrothermal method and various characterization techniques have been employed to investigate the structure, morphology and optical absorption spectra for the prepared samples
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
