Hydrothermal synthesis of 尾-NaYF₄ nanotubes by in situ ion exchange reaction using Y(OH)₃ nanotubes as templates

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• 作者：Lina Liu ; Chunhe Zang ; Yongsheng Zhang ; ^{yszhang@lit.edu.cn}
• 关键词：Nanotubes ; Upconversion ; 尾-NaYF4 ; Template
• 刊名：Applied Surface Science
• 出版年：2012
• 期刊代码：6_01694332
• 类别：ms
• 出版时间：15 June, 2012
• 卷：258
• 期：17
• 页码：6184-6189
• 文件大小：1084 K

摘要

In this article, we reported the synthesis of uniform hexagonal NaYF₄ (尾-NaYF₄) nanotubes through in situ ion exchange reaction using Y(OH)₃ nanotubes as templates via a facile hydrothermal route. The structure and morphology of the products were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that the as-prepared 尾-NaYF₄ with a length of about 4 渭m, an external diameter of about 160 nm, and a thickness of about 50 nm preserved the basic morphology of the initial Y(OH)₃ nanotubes. The influence of pH value of the precursor on the morphology and structure of the products was also studied, and the results indicated that 尾-NaYF₄ nanotubes could only be obtained at proper pH value. The strength of acids adjusting the pH value of the precursor had no influence on the morphology and structure of the products. Additionally, the upconversion luminescence properties of Yb³⁺/Er³⁺ codoped 尾-NaYF₄ were investigated. Yb³⁺/Er³⁺ codoped NaYF₄ emitted bright green and red light, both of which were two-photon processes.