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

nanoparticle 6 6?-dimethyl-2 2?-bipy Zn(II) surfactant

ИССЛЕДОВАНИЕ НОВОЙ МОЛЕКУЛЯРНО-КРИСТАЛЛИЧЕСКОЙ СТРУКТУРЫ КООРДИНАЦИОННОГО ПОЛИМЕРА НИТРАТА МАРГАНЦА(II) С 4,4,10,10-ТЕТРАМЕТИЛ-1,3,7,9-ТЕТРААЗОСПИРО[5.5]УНДЕКАН-2,8-ДИОНОМ, COMPUTATIONAL STUDY ON THE STRUCTURE AND PROPERTIES OF TERNARY COMPLEXES OF Ln3+ (Ln = La, Ce, Nd and Sm) WITH 5,7-DICHLOROQUINOLINE-8-OL AND 4-VINYL PYRIDINE, ...

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. <...> 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 ]. <...> The use of supramolecular compounds as precursors for the preparation of inorganic nanomaterials such as zinc(II) oxide has not yet been investigated thoroughly. <...> X-ray powder diffraction (XRD) measurements were performed using a Philips Xpert diffractometer with monochromated CuKh radiation (y = 1.54056 Е), 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. <...> Also precursor (1) (0.1 mmol) was dissolved immediately in 1.58 ml of oleic acid as a surfactant and formed a light yellow solution. <...> The morphology and size of the as-prepared ZnO samples were further investigated using scanning electron microscopy (SEM). <...> The histographs showed that the average size of ZnO nanoparticles in two compounds is 50—60 nm and 60—70 nm respectively (Fig. 2). <...> Surfactants are often used to synthesize nanostructures in order to change the morphology and particle size. <...> To investigate the role of surfactant on the particle size of zinc(II) oxide nanostructures produced by compound 1, the calcination of compound 1 was performed in the presence of oleic acid as a surfactant at 180 ēC and in the absence of surfactant at 600 ēC (Fig. 3). <...> Comparison of the SEM images of ZnO nanoparticles at two different methods and temparatures (180 ēC and 600 ēC) shows that the higher temperature (600 ēC) results in an increasing of agglomeration and thus small and spherical ZnO particles with good separation were produced by the thermolysis of compound 1 at 180 ēC and by the use of surfactant. <...> The final product obtained <...>

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