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Surface Modification and Fluor escence Properties of Terbium Oxide TeO2 Clusters

2019-03-13
A pulsed laser ablation at the interface of terbium oxide target and mobile phase was used to study the effect of factors as the mobile phase and its flow rate, the pulsed laser power output, the coordination agents, the sequence of the coordination agents addition, on the fluorescence properties of terbium oxide clusters. The UVVis and fluorescence spectroscopy results reveal that anhydrous ethanol with coordination agents is the best mobile phase, which is efficient for the fluorescence properties of terbium oxide organic colloids, and cyclohexanone and ethyl acetate are found to be not suitable for this system; the flow rate of 0.15 mL·s- 1 is efficient; the largest power output of pulsed laser is the best; acac and 2,2′-bipy are the best coordination agents which should be added into the mobile phase before preparation.
 
Terbium oxide doped molybdenum oxide (MoO3:Tb) nanostructures have efficiently been grown by radio frequency (RF) magnetron sputtering. MoO3 nanostructures containing 1, three, five and 7 wt% of terbium oxide are grown on glass substrates. X-ray diffraction (XRD) analysis shows that the MoO3:Tb nanostructures are of layered orthorhombic α-MoO3 segment. The average size of the crystallites is located to growth with accelerated in terbium oxide doping concentration, such that terbium oxide prompts grain increase in MoO3 matrix. 
 
The shifting of the symmetric stretching mode to lower wave numbers inside the micro-Raman spectra of five and 7 wt% doped samples is attributed to the increase in size of the nanoparticles. FESEM and AFM photographs of the nanostructures with 3 wt% terbium oxide doping show the formation of nanoslabs, 5 wt% terbium oxide doping show nanorods with particular orientations and 7 wt% doping show nanotube like structures. The optical band hole power of the nanostructures decreases from three.46 to a few.14 eV with growth in terbium oxide doping attention. Thicknesses of the nanostructures decided from ellipsometric evaluation and vertical FESEM evaluation are inside the same variety and they boom with increase in terbium doping concentrations. Photoluminescence spectra show that the depth of luminescence top will increase with the increase in terbium oxide doping.