BACKGROUND: AN IMPORTANT CLASS OF LIGAND HAVE BEEN WIDELY STUDIED IN COORDINATION CHEMISTRY IS SCHIFF BASE COMPOUNDS. INTERACTION BETWEEN LIGAND AND CENTRAL METAL ION IS VERY IMPORTANT IN CHEMISTRY COORDINATION. THESE INTERACTION CAN BE OBSERVED IN THE THERMODYNAMIC AND KINETIC ASPECT OF THE CHEMICAL REACTIVITY [1-3]. TO DEVELOP SURFACE-MODIFIED ELECTRODES AS SENSORS HAVE BEEN USED SCHIFF BASE COMPLEXES AS CATALYTICALLY ACTIVE COMPOUNDS [4, 5].METHODS: THE SCHIFF BASE LIGAND, H2NAPHOPHEN, WAS PREPARED BY CONDENSATION BETWEEN 1, 2-PHENYLENEDIAMINE AND 2-HYDROXYBENZALDEHYDE (1: 2 MOLE RATIO) IN METHANOL. AN APPROPRIATE AMOUNT OF COBALT (II) ACETATETETRAHYDRATE (1.0 MMOL) AND AMINE (2.0 MMOL) WERE ADDED TO THE H2NAPHOPHEN (1.0 MMOL) AND WAS REFLUXED FOR 1H. THE FORMED CO (II) COMPLEX WAS OXIDIZED BY BLOWING AIR INTO THE SOLUTION FOR 2 H, THEN IT WAS FILTERED. TO THE FILTRATE, AN APPROPRIATE AMOUNT OF POTASSIUM THIOSYANATE (1.0 MMOL) WAS ADDED TO THE SOLUTION AND THE RESULTING CRYSTALS WERE FORMED AFTER 4 DAYS.

BACKGROUND: SEMICONDUCTOR NANOCRYSTALS (NCS) HAVE QUANTIZED EXCITONIC STATES DUE TO QUANTUM CONFINEMENT OF ELECTRONS AND HOLES IN ZERO-DIMENSION NANOSTRUCTURES [1]. ZNSE IS A WIDE DIRECT BAND GAP WHICH IS SUITABLE FOR QD-LEDS, SOLAR CELLS, UV-BLUE EMITTING LASER DIODES AND BIOLOGICAL APPLICATIONS [2]. USING TRANSITION METALS IONS AS IMPURITY, YIELDS HIGH-QUALITY NCS PROVIDE A WIDER RANGE OF VISIBLE EMITTING LIGHT FROM 390 TO 610 NM [3]. MICROWAVE METHOD IS ONE OF NOVEL AND INTERESTING METHODS FOR SYNTHESIS OF NCS WHICH IS A RAPIDLY DEVELOPING AREA OF RESEARCH. IN THIS WORK WE HAVE SYNTHESIZED ZNSE: CU NCS USING A MICROWAVE IRRADIATION METHOD AND INVESTIGATED THE EFFECT OF CU DOPING ON THE OPTICAL PROPERTIES OF ZNSE NCS.METHODS: THE AQUEOUS GROWTH OF ZNSE: CU NCS RESULTS FROM A REACTION BETWEEN ZN+2 AND NAHSE- IN PRESENCE OF THIO-LIGANDS. PROPER AMOUNTS OF SELENIUM POWDER AND NABH4 WERE DISSOLVED IN 1.5 CC DI WATER IN A THREE-NECKED FLASK BY VIGOROUS STIRRING UNDER NITROGEN GAS FLOW. ZINC ACETATE WAS DISSOLVED IN 75 CC DI WATER TO PREPARE ZN IONS SOURCE AND CUPPER ACETATE WAS ADDED SIMPLY TO THE SOLUTION AS THE MOLAR RATIO OF CUPPER ACETATE TO ZINC ACETATE WAS 0.1%, 0.5% AND 1%.0.1 CC TGA WAS ADDED TO THIS SOLUTION AND THE PH VALUE WAS ADJUSTED AT 10 BY ADDING NAOH SOLUTION AND THEN NAHSE- PREPARED SOLUTION WAS SLOWLY INJECTED TO ZN+2 SOLUTION UNDER ARGON GAS FLOW. FINALLY, PREPARED SOLUTION WAS PUT AT THE CENTER OF A MICROWAVE SYSTEM AND WAS HEATED AT 720 W FOR 10 MIN.RESULTS: XRD ANALYSIS DEMONSTRATED CUBIC ZINC BLENDE NCS WITH AN AVERAGE SIZE OF ABOUT 2.5 NM. BAND GAP OF THE NCS WAS OBTAINED ABOUT 3.15 EV. FOR ZNSE NCS, PL SPECTRA INDICATES A BROAD EMISSION WITH TWO PEAKS LOCATED ABOUT 415 AND 500 NM RELATED TO BAND EDGE AND TRAP STATE RESPECTIVELY. FOR ZNSE: CU NCS, PL INTENSITY OF BAND GAP EMISSION AT 415 NM DECREASED GRADUALLY WITH THE INCREASE IN THE CONCENTRATION OF CU DOPANT IONS AND FOR PRECURSOR RATIO OF CU: ZN=1% BAND GAP EMISSION AT 415 NM DISAPPEARED COMPLETELY.CONCLUSION: IN THIS WORK ZNSE: CU NCS WERE SYNTHESIZED USING MICROWAVE IRRADIATION METHOD. XRD PATTERN DEMONSTRATED CUBIC STRUCTURE (ZINC BLENDE) OF ZNSE NCS WITH AN AVERAGE SIZE AROUND 2.5 NM. OBTAINED RESULTS CONFIRMED SUCCESSFULLY INCORPORATION OF CU+2 IN ZNSE STRUCTURE. DOPING OF CU IN ZNSE STRUCTURE CHANGED THE LUMINESCENCE PROPERTIES OF ZNSE CONSIDERABLY.

NANOCOMPOSITES (NC) S WHICH WERE FROM PREPARED OF ORGANIC POLYMER AND INORGANIC NANOPARTICLES (NPS), ARE ONE PARTS OF OUR LIFE, WHICH HAVE ATTAINED MANY APPLICATIONS IN THE FUEL CELLS, MECHANICAL REINFORCEMENT, DRUG DELIVERY SYSTEMS AND CARS [1, 2]. IN THIS WORK, THE OPTICALLY ACTIVE POLY (AMIDE-IMIDE) (PAI) WAS SYNTHESIZED FROM THE POLYMERIZATION REACTION OF N-TRIMELLITYLIMIDO-L-METHIONINE WITH 4, 4′-DIAMINO DIPHENYLETHER USING MOLTEN TETRA-N-BUTYLAMMONIUM BROMIDE AND TRIPHENYLPHOSPHITE [3]. THE SURFACE OF SIO2 NPS WAS MODIFIED USING POLY (VINYL ALCOHOL) (PVA), AND THEN VARIOUS RATIOS OF THE MODIFIED NPS WAS LOADED INTO THE PAI MATRIX. THE OBTAINED PAI-SIO2/PVA NCS (PSPN) S WERE CHARACTERIZED BY VARIOUS TECHNIQUES SUCH AS TRANSMISSION ELECTRON MICROSCOPY AND FIELD EMISSION SCANNING ELECTRON MICROSCOPY (FIG 1). ALL OF ANALYSIS SHOWED THE UNIFORM DISPERSION OF NPS IN PAI MATRIX.

IN FIELD OF NANOTECHNOLOGY, POLYMER BASED NANOCOMPOSITES (NCS) CONTAINING INORGANIC NANOPARTICLES (NPS) HAVE BECOME A NOTICEABLE AREA OF RECENT RESEARCHES. THEY DEMONSTRATE SINGULAR PROPERTIES THAT DON’T FIND IN TRADITIONAL COMPOSITES [1]. IN THIS WORK, POLY (VINYL ALCOHOL) (PVA) WAS USED AS A BIOCOMPATIBLE "MODIFIER" TO PREVENT THE ALUMINA (A-AL2O3) NPS AGGLOMERATION AND CREATE EFFECTIVE INTERACTION WITH THE POLYMER MATRIX. IN ADDITION, OPTICALLY ACTIVE POLY (AMIDE-IMIDE) (PAI) WAS SYNTHESIZED IN IONIC LIQUID AS GREEN SOLVENT [2]. THE MODIFIED NPS (A-AL2O3-PVA NPS) WERE INCORPORATED INTO THE PAI THROUGH ULTRASONIC PROCESS FOR THE PREPARATION OF PAI/AL2O3-PVA NCS. AT THE END, THE OBTAINED PAI/AL2O3-PVA NCS WERE CHARACTERIZED BY DIFFERENT METHODS. ACCORDING TO THE TEM IMAGE, A-AL2O3-PVA NPS WERE HOMOGENEOUSLY DISPERSED IN THE POLYMER MATRIX. SO, THE DIFFRACTION PEAKS OF A-AL2O3-PVA NPS WERE OBSERVED IN PAI/AL2O3-PVA NCS. (FIGURE 1)