魔力尺寸硒化镉纳米晶的压力稳定性研究

doi:10.15541/jim20200383

无机材料学报 ›› 2021, Vol. 36 ›› Issue (5): 502-506.DOI: 10.15541/jim20200383

魔力尺寸硒化镉纳米晶的压力稳定性研究

姜红梅(), 赵文雅, 付瑞净, 肖冠军()

吉林大学超硬材料国家重点实验室, 物理学院, 长春 130012

收稿日期:2020-07-08 修回日期:2020-08-22 出版日期:2021-05-20 网络出版日期:2021-04-19
通讯作者: 肖冠军, 教授. E-mail: xguanjun@jlu.edu.cn
作者简介:姜红梅(1996-), 女, 硕士研究生. E-mail:jianghm18@mails.jlu.edu.cn
基金资助:
国家自然科学基金(11774125);吉林省科技发展计划(20190103044JH)

Pressure-resistance of Magic-sized Cadmium Selenide Nanocrystals

JIANG Hongmei(), ZHAO Wenya, FU Ruijing, XIAO Guanjun()

State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China

Received:2020-07-08 Revised:2020-08-22 Published:2021-05-20 Online:2021-04-19
Contact: XIAO Guanjun, professor. E-mail: xguanjun@jlu.edu.cn
About author:JIANG Hongmei(1996-), female, Master candidate. E-mail:jianghm18@mails.jlu.edu.cn
Supported by:
National Natural Science Foundation of China(11774125);Jilin Province Science and Technology Development Project(20190103044JH)

摘要/Abstract

摘要：

在极端条件下应用的耐压材料必须具有极高的结构和性能稳定性。魔力尺寸纳米晶体具有良好的结构、超小的粒子尺寸和精确的原子组成, 逐渐成为研究的热点。采用胶体化学方法合成了硒化镉(CdSe)魔力尺寸纳米晶, 其第一激子吸收峰位于463 nm处, 相应的光致发光光谱表现出窄的半高宽, 仅为13 nm。进一步利用金刚石对顶砧压机研究了所制备的CdSe魔力尺寸纳米晶在压力下的光学响应和稳定性。研究结果表明: 随着压力的增大, CdSe魔力尺寸纳米晶的吸收和发光峰位保持不变, 这种压力下的稳定行为与传统纳米材料在外界压力下所表现的敏感特性相反; 压力卸下后, 样品仍然保持CdSe魔力尺寸纳米晶的原始结构和形态。CdSe魔力尺寸纳米晶在加压过程中表现出的良好耐压性能, 有助于极端压缩条件下的魔力尺寸纳米材料的研究。

关键词: 魔力尺寸, 硒化镉, 耐压性能, 金刚石对顶砧

Abstract:

Exploration of pressure-resistant materials largely facilitates the operation under extreme conditions where the stable structure and properties are highly desirable. Magic-sized nanocrystals (MSNs) are of great interest due to their well-defined structure, ultra-small particle size, and precise atomic composition. Here, we reported the colloidal synthesis of CdSe MSNs with a sharp first exciton absorption peak at 463 nm. The corresponding photoluminescence (PL) spectrum exhibited a very narrow full width at half-maximum (FWHM) of about 13 nm. In situ high-pressure evolutions of PL and absorption unambiguously indicated that the peak position of as-prepared CdSe MSNs kept nearly unchanged with the pressure increasing. This behavior was completely different from conventional materials upon the stimulus of external pressure. Furthermore, the decompressed samples retained the original structure and morphology of CdSe MSNs. The properties of good pressure resistance of the CdSe MSNs are reflected in the process of pressurization, which improves the research of the magic-sized materials under extreme pressure.

Key words: magic size, cadmium selenide, pressure resistance, diamond anvil cell

中图分类号:

TQ174

姜红梅, 赵文雅, 付瑞净, 肖冠军. 魔力尺寸硒化镉纳米晶的压力稳定性研究[J]. 无机材料学报, 2021, 36(5): 502-506.

JIANG Hongmei, ZHAO Wenya, FU Ruijing, XIAO Guanjun. Pressure-resistance of Magic-sized Cadmium Selenide Nanocrystals[J]. Journal of Inorganic Materials, 2021, 36(5): 502-506.

图/表 4

图1 (a)分散在甲苯中的CdSe MSNs随时间和温度演化的吸收光谱; (b)200 ℃/6 min制备样品的归一化吸收和发光光谱 (激发波长355 nm); (c)a, b, c方向上纤锌矿CdSe的晶体结构示意图

Fig. 1 (a) Absorption spectra of time-temperature evolution of CdSe MSNs samples dispersed in toluene, (b) normalized absorption spectrum (black line, left y-axis) and emission (red line, excitation wavelength 355 nm, right y-axis) of CdSe MSNs obtained at 200 ℃/6 min, and (c) schematic of crystal structure of CdSe in wurtzite (from three different directions of a, b and c, respectively)

图2 (a) CdSe MSNs的高分辨透射电子显微镜照片; (b)图(a)中对应区域的原子有序排列视图; (c)CdSe MSNs的选区电子衍射图像; (d, e)为CdSe MSNs不同元素的面分布

Fig. 2 (a) HRTEM image of CdSe MSNs with (b) corresponding selected area correlation pattern of the square in (a), (c) FFT- HRTEM image of CdSe MSNs, and (d, e) elemental mapping images of CdSe MSNs

图3 (a)在不同压力下CdSe MSNs的荧光光谱, (b)卸压后CdSe MSNs的发光光谱与常压发光光谱的比较(1 atm=101325 Pa)

Fig. 3 (a) High pressure photoluminescence spectra of CdSe MSNs, and (b) comparison of photoluminescence spectra of CdSe MSNs before and after compression (1 atm=101325 Pa) r0 dipicts the ambient pressure after completely releasing pressure

图4 CdSe MSNs在高压下的原位紫外-可见吸收光谱(a), 加压和卸压过程中的带隙演化(b, c), 卸压后的HRTEM照片(d)

Fig. 4 (a) In situ high pressure UV-Vis absorption spectra, (b, c) band gap evolution of CdSe MSNs in the process of pressurization and pressure relief, and (d) HRTEM image of CdSe MSNs after the pressure relief r2.06 and r0 in (a) represent the pressure released to 2.06 GPa and ambient conditions

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魔力尺寸硒化镉纳米晶的压力稳定性研究

Pressure-resistance of Magic-sized Cadmium Selenide Nanocrystals

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