Synthesis and Characterization of Zinc Oxide Nanoparticles Conjugated With Ferulic Acid and Investigation of Optical Transition Properties of Ferulic Acid Using Spectroscopic Techniques.
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Date
2020-10-16
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Addis Ababa University
Abstract
In this research, synthesis and characterization of zinc oxide nanoparticle (ZnO NP),
transition optical properties, self-association properties and the binding of ferulic acid
(FA) and ZnO NPs are investigated. ZnO NP was synthesized by sol-gel synthesis
approach and its optical, structural properties and its purity were investigated using
spectroscopic and microscopic techniques. Equal association constant (EK) dimer
model, uorescence quenching method, the Stern-Volmer equation (model) and Van't
Ho_ equation were utilized for analyzing and interpreting data.
Our _nding revealed that the synthesized ZnO NPs exhibits hexagonal wurtzite structure
with lattice parameters a = 0:3250677 nm and c = 0:5212783 nm. It has average
grain size and band gap energy are 19:89 nm and 3:29 eV , respectively. It's surface
consists of O-H stretching, C-O-H bending, C-O stretching, O-H bending and Zn-O
stretching vibration. The mechanism of quenching is static quenching. Bimolecular
binding constant decreases as temperature increases. Consequently, the uorescence
quenching was initiated by the formation of non-uorescent FA-ZnO NP complex. Enthalpy
and entropy changes were found to be 53:301 kJ=mol and 76:27 J=Kmol.
Accordingly, Van der Waals and hydrogen bond forces play a major role in FA and
ZnO NP interaction. The e_ciency of energy transfer between FA and ZnO NP was
obtained to be 52.31%. Increasing FA concentration causes the molecules to aggregate
and to shift the absorbance maxima. The enthalpy and entropy changes were
obtained to 10:703 kJ=mol and 110:02 (J=Kmol), respectively at all temperatures
and Gibbs free energy at the temperatures 298 K, 310 K and 320 K were 22:084,
23:405 and 24:505 (KJ=mol), respectively.
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Keywords
Synthesis and Characterization, Zinc Oxide Nanoparticles, Conjugated, Ferulic Acid, Investigation of Optical, Transition Properties, Ferulic Acid Using, Spectroscopic Techniques