2013. 54, 2
-
– -
UDC 541.6:546.47:546.21
CHARACTERIZATION OF PURE PHASE Zn(II) OXIDE NANOPARTICLES
VIA THERMAL DECOMPOSITION OF TWO ZINC(II) COMPLEXES OF
THE 6,6-DIMETHYL-2,2-BIPYRIDINE LIGAND
M. Hosseinifard1, L. Hashemi2, V. Amani1, A. Morsali2
1Department of Chemistry, Faculty of Sciences, Islamic Azad University, Shahr-e-Rey Branch, Tehran, Iran
2Department of Chemistry, Faculty of Sciences, Tarbiat Modares University, Tehran, Iran
E-mail: morsali_a@modares.ac.ir
Received October, 7, 2011
Revised — July, 1, 2012
Two zinc(II) complexes [Zn(6,6-dimethyl-2,2-bipy)Cl2]n (1) and [Zn(6,6-dimethyl-2,2bipy)I2]n
(2) are synthesized from the reaction of the 6,6-dimethyl-2,2-bipy ligand with ZnCl2
and ZnI2. Zinc(II) oxide nanoparticles are synthesized by the thermolysis of [Zn(6,6-dimethyl2,2-bipy)Cl2]n
(1) and [Zn(6,6-dimethyl-2,2-bipy)I2]n (2) at two different temperatures. The
ZnO nanoparticles are characterized by X-ray diffraction and scanning electron microscopy
(SEM). SEM images show the average size of the ZnO nanoparticles produced of 50 nm and
60 nm in compounds 1 and 2 respectively.
Keywords: nanoparticle, 6,6-dimethyl-2,2-bipy, Zn(II), surfactant.
INTRODUCTION
ZnO is polar inorganic crystalline material with many applications due to its interesting properties
such as nontoxicity, good electrical, optical and piezoelectric behavior, stability in a hydrogen plasma
atmosphere and low price [ 1—10]. ZnO is a well-known semiconductor with a wide direct band gap
(3.37 eV), a large excitation binding energy of 60 meV at room temperature [ 4, 5 ] and a wide range
of applications such as solar cells, luminescent, electrical and acoustic devices, gas and chemical sensors,
coatings, catalysts, micro lasers, memory arrays and biomedical applications [ 6 ]. Many methods
have already been developed to synthesize zinc(II) oxide and sulfide nanocrystals such as vapor phase
growth [ 7 ], vapor liquid-solid process [ 2 ], soft chemical method [9 ], electrophoretic deposition
[ 10 ], sol-gel process [ 11, 12 ], homogeneous precipitation [ 13 ], etc. The use of supramolecular compounds
as precursors for the preparation of inorganic nanomaterials such as zinc(II) oxide has not yet
been investigated thoroughly. In this paper we describe a simple method for preparing nanoparticles of
ZnO with the use of [Zn(6,6-dimethyl-2,2-bipy)Cl2]n (1) and [Zn(6,6-dimethyl-2,2-bipy)I2]n (2) as
precursors.
EXPERIMENTAL
Materials and physical techniques. All reagents and solvents for the synthesis and analysis were
commercially available and used as received. X-ray powder diffraction (XRD) measurements were
performed using a Philips Xpert diffractometer with monochromated CuKh radiation (y = 1.54056 Å),
a step size of 0.05 degrees and a counting time of 5 s per step. The samples were characterized with a
scanning electron microscope (SEM) (Philips XL 30) with gold coating.
Preparation of [Zn(6,6-dimethyl-2,2-bipy)Cl2]n (1). According to the literature [ 14 ], for the
preparation of compound [Zn(6,6-dimethyl-2,2-bipy)Cl2]n (1), a solution of 6,6-dimethyl-2,2-bi©
Hosseinifard M., Hashemi L., Amani V., Morsali A., 2013
. 336 – 338
Стр.1