Europium doped ZnO/SnO2 nanocomposite phosphors were synthesized via room temperature co-precipitation method. In this work structural changes, optical properties and the associated photoluminescence response were inv...Europium doped ZnO/SnO2 nanocomposite phosphors were synthesized via room temperature co-precipitation method. In this work structural changes, optical properties and the associated photoluminescence response were investigated for different compositions of ZnO and SnO2 activated with Eu3+ ions. The prepared samples were systematically characterized by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy for obtaining the structural information about the prepared materials. Diffuse reflectance (DR) UV-Vis spectrometer and photoluminescence (PL) spectroscopy technique were employed for studying the optical properties of prepared materials. XRD results confirmed the presence of both phases, hexagonal ZnO as well as tetragonal SnO2 simultaneously and further using Debye Scherrer's and Hall-Williamson relations, crystallite size were estimated and it was found to be in the range of 8-14 nm. The FTIR studies revealed the presence of different stretching and bending modes of Zn-O and Sn-O with an additional stretching and bending vibration of absorbed water (O-H) molecules. FESEM images suggested that the particle size lied in the range of 50 to 70 nm, which were almost spherical in shapes. A long range multi colour emission from blue to red region was observed for the 320 nm excitation wavelength. The observed emission involved sharp emission due to 5D0→7F1 transition that corresponded to the magnetic dipole transition. The study showed that the Eu3+ doped nanocomposite was more suitable material than singly Eu3+ doped ZnO and Eu3+ doped SnO2 with enhanced opto-eleetronic and luminescence properties and potential applications in display devices.展开更多
The nanosized binary mixed oxides of Zn/Sn had been prepared by the fractional homogeneous precipitation route using urea as the latent precipitant under boiling reflux condition The samples prepared with the differen...The nanosized binary mixed oxides of Zn/Sn had been prepared by the fractional homogeneous precipitation route using urea as the latent precipitant under boiling reflux condition The samples prepared with the different initial concentrations of urea or calcined at different temperatures had been investigated by X-ray diffration (XRD) or transmission electron microscopy (TEM). The calcination temperature had obvious effect on the phase composition and the crystal size of the samples attained, and the precipitant concentration also had obvious effect on the oxide particles size and the production rate of ZnO.展开更多
基金supported by ISM research scholars funding by Government of India
摘要Europium doped ZnO/SnO2 nanocomposite phosphors were synthesized via room temperature co-precipitation method. In this work structural changes, optical properties and the associated photoluminescence response were investigated for different compositions of ZnO and SnO2 activated with Eu3+ ions. The prepared samples were systematically characterized by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy for obtaining the structural information about the prepared materials. Diffuse reflectance (DR) UV-Vis spectrometer and photoluminescence (PL) spectroscopy technique were employed for studying the optical properties of prepared materials. XRD results confirmed the presence of both phases, hexagonal ZnO as well as tetragonal SnO2 simultaneously and further using Debye Scherrer's and Hall-Williamson relations, crystallite size were estimated and it was found to be in the range of 8-14 nm. The FTIR studies revealed the presence of different stretching and bending modes of Zn-O and Sn-O with an additional stretching and bending vibration of absorbed water (O-H) molecules. FESEM images suggested that the particle size lied in the range of 50 to 70 nm, which were almost spherical in shapes. A long range multi colour emission from blue to red region was observed for the 320 nm excitation wavelength. The observed emission involved sharp emission due to 5D0→7F1 transition that corresponded to the magnetic dipole transition. The study showed that the Eu3+ doped nanocomposite was more suitable material than singly Eu3+ doped ZnO and Eu3+ doped SnO2 with enhanced opto-eleetronic and luminescence properties and potential applications in display devices.
摘要结合静电纺丝和水热法制备了ZnO/SnO_2分级纳米结构.扫描电镜结果显示,直径为20~30 nm且粗细均匀的ZnO纳米棒阵列均匀地生长在长2~10μm的SnO_2纳米线上.与纯ZnO纳米棒和纯SnO_2纳米线相比,ZnO/SnO_2分级纳米结构显现出更优越的气敏性能,在300℃下对体积分数为100×10-6的丙酮气体的灵敏度高达22.76,响应时间为13 s,恢复时间为10 s.
基金Acknowledgments: This work was supported by the National Natural Science Foundation of China (No. 20673042), the Natural Science Foundation of Anhui Provincial Education Committee (No. K12007B014), the Natural Science Foundation of Anhui Province (No. 070415211), China Postdoctoral Science Foundation (No. 2004036511), the Laboratory Open Foundation of Green Materials Chemistry (No. KLSF(I)09), and the Laboratory Open Foundation of Guangdong Public Laboratory of Environmental Science and Technology. The authors thank Mr. LUO S. M., Mr. CHEN D. Z., and Mr. TAO Q. for their assistance.
摘要The nanosized binary mixed oxides of Zn/Sn had been prepared by the fractional homogeneous precipitation route using urea as the latent precipitant under boiling reflux condition The samples prepared with the different initial concentrations of urea or calcined at different temperatures had been investigated by X-ray diffration (XRD) or transmission electron microscopy (TEM). The calcination temperature had obvious effect on the phase composition and the crystal size of the samples attained, and the precipitant concentration also had obvious effect on the oxide particles size and the production rate of ZnO.