摘要
采用原位聚合法,以聚丙烯酸（PAA）和聚乙烯吡咯烷酮（PVP）为壳层材料,对NaYF4上转换发光材料表面进行了PAA和PVP的修饰,傅立叶红外吸收光谱和热重分析证明了NaYF4纳米粒子表面有PAA和PVP的存在,透射电镜显示,当反应温度在0℃,丙烯酸单体含量为8.0wt%,反应时间130min时,PAA修饰的纳米粒子微观形貌最佳;当反应温度在60℃,乙烯基吡咯烷酮单体含量在12.0wt%,反应时间在150min的条件下,PVP修饰的纳米粒子微观形貌最佳。上转换荧光测试结果证明,在对材料进行NaYF4无机壳层包覆后再进行水溶性高聚物修饰,能够使其荧光性能保持不变。
The NaYF4 up-conversion phosphors were successfully modified with PAA and PVP by in-situ polymerization. The existence of PAA and PVP on the surface of NaYF4 was proved by FI-IR and TAG. TEM images showed that the PAA coated uniform nanoparticles were obtained with 8.0 wt.% acrylic acid content （the content percentage in the whole reaction system） at 0℃ within 130 min, and the PVP coated uniform nanoparticles were obtained with 12.0 wt.% vinyl-pyrrolidone content at 60℃ within 150 min. Fluorescence tests showed that the coating of material with analogous NaYF4 of before polymer modifying can keep fluorescence property.
出处
《纳米科技》
2011年第1期56-61,65,共7页
基金
上海市自然科学基金项目（10ZR1400600）
