New Hybrid Properties of TiO2 Nanoparticles Surface Modified With Catecholate Type Ligands

Abstract Surface modification of nanocrystalline TiO2 particles (45 Å) with bidentate benzene derivatives (catechol, pyrogallol, and gallic acid) was found to alter optical properties of nanoparticles. The formation of the inner-sphere char...

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Main Authors:	Džunuzović Enis, Janković Ivana, Šaponjić Zoran, Nedeljković Jovan
Format:	Article
Language:	English
Published:	SpringerOpen 2009-01-01
Series:	Nanoscale Research Letters
Subjects:	TiO<sub>2</sub> nanoparticles Surface modification Catechol Pyrogallol Gallic acid
Online Access:	http://dx.doi.org/10.1007/s11671-009-9447-y

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spelling	doaj-879b14f72be44468b5a2dd4feb5bba212020-11-24T21:17:41ZengSpringerOpenNanoscale Research Letters1931-75731556-276X2009-01-01518188New Hybrid Properties of TiO<sub>2</sub> Nanoparticles Surface Modified With Catecholate Type LigandsDžunuzović EnisJanković IvanaŠaponjić ZoranNedeljković Jovan<p>Abstract</p> <p>Surface modification of nanocrystalline TiO<sub>2</sub> particles (45 Å) with bidentate benzene derivatives (catechol, pyrogallol, and gallic acid) was found to alter optical properties of nanoparticles. The formation of the inner-sphere charge–transfer complexes results in a red shift of the semiconductor absorption compared to unmodified nanocrystallites. The binding structures were investigated by using FTIR spectroscopy. The investigated ligands have the optimal geometry for chelating surface Ti atoms, resulting in ring coordination complexes (catecholate type of binuclear bidentate binding–bridging) thus restoring in six-coordinated octahedral geometry of surface Ti atoms. From the Benesi–Hildebrand plot, the stability constants at pH 2 of the order 10<sup>3</sup> M<sup>−1</sup> have been determined.</p> http://dx.doi.org/10.1007/s11671-009-9447-yTiO<sub>2</sub> nanoparticlesSurface modificationCatecholPyrogallolGallic acid
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Džunuzović Enis Janković Ivana Šaponjić Zoran Nedeljković Jovan
spellingShingle	Džunuzović Enis Janković Ivana Šaponjić Zoran Nedeljković Jovan New Hybrid Properties of TiO<sub>2</sub> Nanoparticles Surface Modified With Catecholate Type Ligands Nanoscale Research Letters TiO<sub>2</sub> nanoparticles Surface modification Catechol Pyrogallol Gallic acid
author_facet	Džunuzović Enis Janković Ivana Šaponjić Zoran Nedeljković Jovan
author_sort	Džunuzović Enis
title	New Hybrid Properties of TiO<sub>2</sub> Nanoparticles Surface Modified With Catecholate Type Ligands
title_short	New Hybrid Properties of TiO<sub>2</sub> Nanoparticles Surface Modified With Catecholate Type Ligands
title_full	New Hybrid Properties of TiO<sub>2</sub> Nanoparticles Surface Modified With Catecholate Type Ligands
title_fullStr	New Hybrid Properties of TiO<sub>2</sub> Nanoparticles Surface Modified With Catecholate Type Ligands
title_full_unstemmed	New Hybrid Properties of TiO<sub>2</sub> Nanoparticles Surface Modified With Catecholate Type Ligands
title_sort	new hybrid properties of tio<sub>2</sub> nanoparticles surface modified with catecholate type ligands
publisher	SpringerOpen
series	Nanoscale Research Letters
issn	1931-7573 1556-276X
publishDate	2009-01-01
description	<p>Abstract</p> <p>Surface modification of nanocrystalline TiO<sub>2</sub> particles (45 Å) with bidentate benzene derivatives (catechol, pyrogallol, and gallic acid) was found to alter optical properties of nanoparticles. The formation of the inner-sphere charge–transfer complexes results in a red shift of the semiconductor absorption compared to unmodified nanocrystallites. The binding structures were investigated by using FTIR spectroscopy. The investigated ligands have the optimal geometry for chelating surface Ti atoms, resulting in ring coordination complexes (catecholate type of binuclear bidentate binding–bridging) thus restoring in six-coordinated octahedral geometry of surface Ti atoms. From the Benesi–Hildebrand plot, the stability constants at pH 2 of the order 10<sup>3</sup> M<sup>−1</sup> have been determined.</p>
topic	TiO<sub>2</sub> nanoparticles Surface modification Catechol Pyrogallol Gallic acid
url	http://dx.doi.org/10.1007/s11671-009-9447-y
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New Hybrid Properties of TiO<sub>2</sub> Nanoparticles Surface Modified With Catecholate Type Ligands

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