微乳液法一步制备NaYF_4∶Yb~(3+),Ho~(3+)@Au
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摘要
稀土氟化物纳米材料及其贵金属复合物具有独特的光、电、磁性质,在生物标记、光学储存、显示、防伪等领域有着广泛的应用,已成为材料科学领域的研究热点之一。采用微乳液法制备了NaYF_4∶Yb~(3+),Ho~(3+)和NaYF_4∶Yb~(3+),Ho~(3+)@Au复合材料,XRD测试表明NaYF_4∶Yb~(3+),Ho~(3+)的结晶情况良好,无杂质峰,为立方相,NaYF_4∶Yb~(3+),Ho~(3+)@Au产物的衍射峰中同时含有NaYF_4与Au两种晶相;SEM图像显示两种纳米粒子均为形貌、尺寸较为均一的球形粒晶为58nm左右;上转换光谱中显示Ho~(3+)在484,682和767nm处具有很高的发光强度,分别对应于~5S_2→~5I_8,~5F_5→~5I_8,~5S_2→~5I_7跃迁。
Rare earth fluoride nanomaterials and their precious metal complexes have unique optical,electrical and magnetic properties,which have been widely used in biomarker,optical storage,display and security.It has become one of the hotspots in the field of materials science.In this paper,the NaYF_4∶Yb~(3+),Ho~(3+),NaYF_4∶Yb~(3+),and Ho~(3+)@Au composites were prepared by using microemulsion method.The results show that NaYF_4∶Yb~(3+),Ho~(3+)@Au composites were directly formed in the microemulsion system.The XRD shows that the NaYF_4∶Yb~(3+),Ho~(3+)is cubic phase,and there is no impurity peaks.Moreover,the diffraction peaks of NaYF_4∶Yb~(3+),Ho~(3+)@Au contain both NaYF_4and Au.It can be seen from the SEM that the nanoparticles are uniform spherical whose particle size is about 58nm.In the up-conversion spectra,the high luminous intensity at 484,682and 767nm are corresponding to ~5S_2→~5I_8,~5F_5→~5I_8,~5S_2→~5I_7transition of Ho~(3+).
Rare earth fluoride nanomaterials and their precious metal complexes have unique optical,electrical and magnetic properties,which have been widely used in biomarker,optical storage,display and security.It has become one of the hotspots in the field of materials science.In this paper,the NaYF_4∶Yb~(3+),Ho~(3+),NaYF_4∶Yb~(3+),and Ho~(3+)@Au composites were prepared by using microemulsion method.The results show that NaYF_4∶Yb~(3+),Ho~(3+)@Au composites were directly formed in the microemulsion system.The XRD shows that the NaYF_4∶Yb~(3+),Ho~(3+)is cubic phase,and there is no impurity peaks.Moreover,the diffraction peaks of NaYF_4∶Yb~(3+),Ho~(3+)@Au contain both NaYF_4and Au.It can be seen from the SEM that the nanoparticles are uniform spherical whose particle size is about 58nm.In the up-conversion spectra,the high luminous intensity at 484,682and 767nm are corresponding to ~5S_2→~5I_8,~5F_5→~5I_8,~5S_2→~5I_7transition of Ho~(3+).
引文
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