静电纺丝法制备GaInO_3纳米纤维及其光学性能

Preparation and Optical Property of Electrospun GaInO_3 Nanofibers

采用静电纺丝法制备了PVP/In(NO3)3·4.5H2O/Ga(NO3)3·xH2O前驱体纳米纤维,然后经高温煅烧获得了多孔结构的GaInO3无机纳米纤维,并对其光学性能进行了研究。利用扫描电镜(SEM)、热重仪(TGA)、X射线衍射仪(XRD)、傅里叶红外光谱仪(FT-IR)、紫外-可见光谱仪(UVvis)和荧光分光光度计(PL)对样品的形貌、结构、组分和光学性能进行了表征。结果表明,当硝酸盐与PVP的质量比为20%时,前驱体纳米纤维成型良好;经800℃、900℃和1000℃煅烧4h仍能保持纤维结构,但纤维直径明显减小;当煅烧温度大于或等于900℃时,才生成六角晶系GaInO3;根据UV-vis测试结果计算出800℃、900℃和1000℃煅烧后样品的禁带宽度分别为3.22eV、3.48eV和3.66eV;经250nm光激发后其室温光致发光光谱在496nm处出现较强的蓝绿光发射峰。

PVP/In(NO3)3·4.5H2O/ Ga(NO3)3·xH2O precursor nanofibers were prepared by electrospinning.Afterward,GaInO3 inorganic nanofibers with porous structure were obtained through hightemperature calcination.In order to do an overall optical research on the materials,the morphology,structure,component and optical properties of the prepared samples were investigated by scanning electron microscopy(SEM),thermogravimetry(TGA),X-ray diffraction(XRD),fourier transform infrared spectroscopy(FTIR),UV-vis spectra(UV-vis)and fluorescence spectrophotometer(PL).The results show that when the mass ratio of nitrate and PVP is 20%,the formation of precursor nanofibers is favorable.The products calcined at800℃、900℃ and 1000℃for 4hstill remain fibrous structure,but the diameters are obviously reduced;When the calcination temperature is not lower than 900℃,hexagonal GaInO3 will be obtained.According to the results of UV-vis the band gap of the samples calcined at 800℃、900℃and 1000℃ were calculated,and they are3.22 eV,3.48 eV and 3.66 eV respectively;A strong green photoluminescence with a peak at 496 nm is observed upon excitation at 250 nm at room temperature.