毕业论文

打赏
当前位置: 毕业论文 > 化学论文 >

无机纳米功能材料的制备与发光性能研究

时间:2020-01-19 19:56来源:毕业论文
以获得掺杂铕的磷酸盐纳米晶体并对其进行性能表征为研究目标,采用水热合成的方法,以磷酸,蒸馏水,无水乙醇,油酸,氯化铕,氯化镧为原料,合成了单斜晶系的LaPO4:Eu3+纳米晶

摘要本课题以获得掺杂铕的磷酸盐纳米晶体并对其进行性能表征为研究目标,采用水热合成的方法,以磷酸,蒸馏水,无水乙醇,油酸,氯化铕,氯化镧为原料,合成了单斜晶系的LaPO4:Eu3+纳米晶体,并制备了不同Eu3+掺杂比的LaPO4纳米晶体。利用 XRD、TEM、PL对所得样品的物相和形貌进行了表征.从X射线粉末衍射结果看出,当反应时间为3小时时,反应温度为160C和190℃,以及Eu3+浓度不一样时,得到的LaPO4:Eu3+纳米晶体均为纯的单斜相;观察TEM照片发现在反应温度为160℃和190℃,Eu3+掺杂4.76%的LaPO4纳米晶体晶粒的排列无规则,晶粒的分散性较好,呈针状结构,粒径和长度大小不一。但是,随着反应温度的增加,晶粒的平均粒径和平均长度均减少,结晶度降低。PL的结果表明,当激发波长为395nm时,主发射峰主要是588nm(5D0 → 7F1)和613nm(5D0→ 7F2)。当Eu3+掺杂比不同时,当Eu3+掺杂量较高为13%时,单斜晶系的LaPO4纳米晶体的荧光性最好。 44268

Abstract This work is aim to obtain LaPO4 doped with Eu3+ and research the characterization as a research objective, by hydrothermal synthesis method, phosphoric acid, distilled water, ethanol, oleic acid, eeuropium chlorid, lanthanum chloride as raw material synthesized LaPO4: Eu3 + nanocrystals with monoclinic system, and prepared different Eu3 + Doped LaPO4 :Eu3 + nanocrystals. The resulting sample phase and morphology were characterized by using of XRD, TEM, PL. From X-ray powder diffraction results seen when the reaction time was 3 hours, the reaction temperature is 160℃ and 190 ℃, and Eu3 + concentration is not the same, the resulting LaPO4: Eu3 + nanocrystals are pure monoclinic phase;TEM photograph was found in the reaction under 160 ℃ and 190 ℃ , Eu3 + doped with 4.76% of LaPO4 nanocrystals, irregular arrangement of grains, better dispersion of grains, needle-like structure, size and length size mixed. However, with increasing reaction temperature, the average particle diameter and the average length of the crystal grains were reduced, the degree of crystallinity decreases. PL results show that when the excitation wavelength of 395nm, the main emission peak is mainly 588nm (5D0 → 7F1) and 613nm (5D0 → 7F2). When Eu3 + Doped ratio is not the same, when Eu3 + Doped amount is 13% higher, the fluorescence of the monoclinic system LaPO4 nanocrystals best.

毕业论文关键词:LaPO4:Eu3+纳米晶; 水热合成法; 荧光光谱

Key Words: LaPO4:Eu3+ nanocomposite material; Hydrothermal synthesis;  Fluorescence spectrum

目   录

摘   要 II

Abstract III

目   录 IV

1 引言 1

1.1 研究背景 1

1.2  研究进展 1

1.3  研究方法 2

1.3.1 水热合成法 2

1.3.2 微波合成法 3

1.3.3 沉淀法 3

1.3.4 高温固相合成法 4

1.4  研究待解决目标 4

2 实验 5

2.1 材料的制备 5

2.1.1  试剂 5

2.1.2  LaPO4:Eu3+纳米晶的制备 5

2.2 仪器 6

3 结果与讨论 无机纳米功能材料的制备与发光性能研究:http://www.lwfree.com/huaxue/lunwen_45503.html

------分隔线----------------------------
推荐内容