Gd2O3:Yb3+,Er3+上转换纳米纤维的制备与表征
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吉林省科技发展计划重大项目(20070402, 20060504);教育部科学技术研究重点项目(207026);长春市科技计划项目(2007045);吉林省教育厅“十一五”科学技术研究项目(2007-45, 2006JYT05);吉林省环保局科技项目(2006-24)


Fabrication and Characterization of Gd2O3: Yb3+, Er3+ Upconversion Nanofibers
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    摘要:

    采用溶胶-凝胶法与静电纺丝技术相结合制备了PVA/[Gd(NO3)3+Yb(NO3)3+Er(NO3)3]复合纳米纤维,将其进行热处理,得到Gd2O3:Yb3+,Er3+上转换纳米纤维.采用XRD、SEM、TG-DTA、FTIR和荧光光谱对样品进行了表征.结果表明:复合纳米纤维为无定型,Gd2O3:Yb3+,Er3+上转换纳米纤维属于体心立方晶系,空间群为Ia3.复合纳米纤维的平均直径约为140nm,经过600℃焙烧后,获得了直径约60nm的Gd2O3:Yb3+,Er3+上转换纳米纤维.当焙烧温度高于600℃时,复合纳米纤维中水分、有机物和硝酸盐分解挥发完毕,样品不再失重,总失重率为81%.复合纳米纤维的红外光谱与纯PVA的红外光谱一致,600℃以上时,生成了Gd2O3:Yb3+,Er3+上转换纳米纤维.该纤维在980nm激光激发下发射出中心波长为522nm、560nm的绿色和659nm的红色上转换荧光,对应于Er3+离子的2H11/2/4S3/2→4Il5/2跃迁和4F9/2→4Il5/2跃迁.在Gd2O3:Yb3+,Er3+上转换纳米纤维形成过程中,PVA分子起到了导向模板作用.PVA/[Gd(NO3)3+Yb(NO3)3+Er(NO3)3]复合纳米纤维在热处理过程中,PVA分解挥发,稀土硝酸盐分解并氧化生成Gd2O3:Yb3+,Er3+纳米颗粒,这些纳米颗粒相互联结起来形成了Gd2O3:Yb3+,Er3+上转换纳米纤维.

    Abstract:

    PVA/[Gd(NO3)3+Yb(NO3)3+Er(NO3)3] composite nanofibers were fabricated by the combination of sol-gel method and electrospinning. Gd2O3:Yb3+, Er3+ upconversion nanofibers were obtained by calcination of the relevant composite nanofibers. The samples were characterized using XRD, SEM, TG-DTA, FTIR and fluorescence spectroscopy techniques. The results showed that the composite nanofibers were amorphous in structure, and Gd2O3:Yb3+,Er3+ upconversion nanofibers were cubic in structure with space group Ia3. The mean diameter of the composite nanofibers was ca. 140nm, and the Gd2O3:Yb3+,Er3+ upconversion nanofibers of 60nm in average diameter were acquired at 600°C. The water, organic compounds, nitrates in the composite nanofibers were decomposed and volatilized totally, and the weight of the sample kept constant when sintering temperature was above 600°C, and the total weight loss percentage was 81%. The FTIR spectrum of the composite nanofibers was basically the same as that of the pure PVA, and Gd2O3:Yb3+, Er3+ upconversion nanofibers were formed above 600ºC. Under the excitation of a 980 nm continuous wave diode laser, the Gd2O3:Yb3+, Er3+ nanofibres emitted strong green and red upconversion emissions centered at 522nm, 560nm and 659nm, respectively. The green emissions were attributed to the transitions of 2H11/2/4S3/2→4Il5/2 energy levels of Er3+ ions, and the red emission was assigned to the transition of 4F9/2→4Il5/2 energy levels of Er3+ ions. In the course of Gd2O3:Yb3+, Er3+ upconversion nanofibers formation, PVA acted as template. When the composite nanofibers were sintered, PVA was decomposed and evaporated, and rare earth nitrates were also decomposed and oxidized into Gd2O3:Yb3+, Er3+ nanoparticles, and these nanoparticles were mutually connected to form the Gd2O3:Yb3+, Er3+ upconversion nanofibers.

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董相廷,王进贤,刘莉,刘桂霞. Gd2O3:Yb3+,Er3+上转换纳米纤维的制备与表征[J].红外与毫米波学报,2010,29(1):10~14]. DONG Xiang-Ting, WANG Jin-Xian, LIU Li, LIU Gui-Xia. Fabrication and Characterization of Gd2O3: Yb3+, Er3+ Upconversion Nanofibers[J]. J. Infrared Millim. Waves,2010,29(1):10~14.]

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  • 收稿日期:2009-02-20
  • 最后修改日期:2009-09-03
  • 录用日期:2009-05-04
  • 在线发布日期: 2009-12-28
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