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Identifier

000421539

Title

Chemical synthesis of ZnO nanostructures, following environmental friendly approaches and study of their structural and optical properties.

Alternative Title

Σύνθεση νανοδομών ZnO με χημικές τεχνικές φιλικές προς το περιβάλλον και μελέτη των δομικών και οπτικών τους ιδιοτήτων.

Author

Πετρομιχελάκη, Ευαγγελία Γ.

Thesis advisor

Γεωργακίλας, Αλέξανδρος

Reviewer

Άγγλος, Δημήτριος
Κενακάκης, Γεώργιος

Abstract

This Master thesis focuses on the chemical synthesis of zinc oxide (ZnO) nanostructures, following environmental friendly approaches, with emphasis on their structural and optical properties. The synthesis of ZnO nanostructures was based on an aqueous solution chemical (ACG) method, a low cost, environmental friendly technique that does not require any complicate or expensive equipment, at mild temperatures. Moreover, it is the first time that ZnO was synthesized following the ACG approach at temperatures as high as 195°C max., using eco-friendly solvents, such as water or mild alcohol solutions. Subsequently, in comparison to other research groups, edible alcoholic distillations were used as solvents, in order to synthesize different morphologies of ZnO, enriched with dopants coming from the characteristic ingredients of each drinking alcohol. Last but not least, we present nano- and micro-structures of ZnO that have been synthesized using metallic zinc, in the form of powder, in various solvents, without further annealing. These samples resulted in sharp photoluminescence characteristic peaks at room temperature, with intensities much higher than the ones recorded so far. The morphology and the structural properties of the synthesized ZnO nanostructures were studied by means of scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively, while their optical properties were examined through photoluminescence (PL) spectroscopy measurements. Their structural properties disclose a hexagonal wurtzite structure, while photoluminescence spectroscopy measurements reveal that the as-grown ZnO samples exhibit strong UV emission, which corresponds to the near band edge emission of ZnO. It is concluded that ZnO nanostructures can be synthesized based on an environmental green synthesis approach, using non-toxic reagents, exhibiting remarkable PL properties.

Language

English

Subject

Aqueous chemical growth (ACG)

Green synthesis

photoluminescence (PL)

Νανοδομές

Πράσινη σύνθεση

Σύνθεση σε υδατικά διαλύματα (ACG)

Φωτοφωταύγεια (PL)

Issue date

2019-03-29