Comparative study on zinc oxide nanocrystals synthesized by two precipitation methods

Abstract

Zinc oxide nanocrystals were synthesized by two precipitation methods successfully. The nanocrystals prepared via method I (zinc acetate dihydrate precipitation with KOH) were smaller in crystallite size (~20 nm) as compared to method II (zinc nitrate hexahydrate precipitation with N,N-dimethylformamide, ~33 nm). FTIR technique was used to study chemical bonding; SEM and EDS were used to study morphology and chemical compositions. Number of concentric rings corresponding to diffraction peaks was higher in SAED pattern for ZnO nanocrystals synthesized by method I than II. Variation in the energy band gap as a function of particle size was determined using absorption spectra from UV-vis-NIR spectrophotometer. Redshift was observed in the energy band gap of sample prepared via method II. Particle size and the structure of the nanocrystals were analysed by transmission electron microscope (TEM). From TEM study, it was found that the average particle size of method I nanocrystals was smaller compared to method II nanocrystals. Magnetic study was carried out using VSM. Ferromagnetism like contribution was observed for the sample prepared by method II.

Preparation of Nano Zinc Oxide and its Application in the Photocatalytic Degradation of Ampicillin

“…This means the preparation method affects the morphology and shape of particles. This agrees with (Bodke, et al, 2018) who found that ZnO prepared by two precipitation method gave different morphology 3.1.3Atomic Force Microscopy (AFM)…”

“…For the FTIR absorption spectra of zinc oxide nanoparticles prepared by precipitation method, a wide band of about 3426.2 cm -1 was noticed, which normally occurs because of stretching and bonding patterns of (O-H) group. Absorption stretching of ZnO was observed at about 891.05 cm -1 and the band at around 550 cm -1 of the stretching pattern of zinc oxide (Bodke et al, 2018). For the type prepared by the microemulsion method, wideband appeared at about 3458.13cm -1, which occurs because of stretching and bonding patterns of (O-H) group.…”

Facile Controlling of the Physical Properties of Zinc Oxide and Its Application to Enhanced Photocatalysis

“…The bands at ∼1681 and 1646 cm −1 can be associated with the bending vibrations of H 2 O molecules [ 42 ]. The absorption bands at ∼1407, ∼930, and ∼879 cm −1 might due to the vibration of the C=O bond in CO 2 adsorbed on the surface of ZnO [ 43 ]. The Zn-O bond could exhibit the adsorption peaks in the range of 650–400 cm −1 [ 44 ].…”

Experimental Design Modeling of the Effect of Hexagonal Wurtzite—ZnO Synthesis Conditions on Its Characteristics and Performance as a Cationic and Anionic Adsorbent

“…The maximum rate of weight loss was 0.2%/min, at which 8% loss of material occurred at around 692 °C. The exothermic peak at 692 °C in the DTA curve is a result of the decomposition of traces of Zn(OH) 2 existing in the sample [45]. These results reveal a good thermal stability of the sample.…”