In Situ Sintering of CdSe/CdS Nanocrystals under Electron Beam Irradiation.
In Situ Sintering of CdSe/CdS Nanocrystals under Electron Beam Irradiation.
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DOI：
10.3390/nano13243082
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发表时间：
2023-12-05
期刊：
影响因子：
--
通讯作者：
Cheng Y
中科院分区：
文献类型：
--
作者：
Tang L;Zhang C;Liao C;Liu Y;Cheng Y
胶体半导体纳米晶体由于其巨大的电学和光学性质而引起了广泛的关注。纳米粒子由于其较大的表面积与体积比，在加工或使用过程中在短时间内表现出强烈的聚集和烧结倾向，这可能会导致其所需性能的显着变化。因此，深入研究纳米粒子的烧结过程和机理以保持其稳定性具有重要意义。在这里，使用原位透射电子显微镜（TEM）研究了连续电子束照射下 CdSe/CdS 核/壳纳米晶体的烧结过程。在烧结的早期阶段，CdSe/CdS 纳米晶体彼此接近的距离约为 1-2 nm。随着电子束暴露时间的增加，纳米晶体表面原子的运动导致它们之间发生接触。随后，接触表面上的原子经历快速运动，导致颗粒之间迅速形成颈部。相邻颗粒之间的颈部形成提供了强有力的证据，证明烧结机制主要是表面原子扩散而不是奥斯特瓦尔德熟化。该领域的进一步研究可能会导致开发改进的方法来防止烧结并增强纳米晶体的稳定性，最终有助于改进基于纳米材料的设备和具有持久性能的材料。
Colloidal semiconductor nanocrystals have attracted widespread attention due to their tremendous electrical and optical properties. Nanoparticles exhibit a strong tendency to aggregate and sinter in a short period of time during processing or use due to their large surface area-to-volume ratio, which may lead to significant changes in their required performance. Therefore, it is of great significance to conduct in-depth research on the sintering process and mechanism of nanoparticles to maintain their stability. Here, the sintering process of CdSe/CdS core/shell nanocrystals under continuous electron beam irradiation was studied using in situ transmission electron microscopy (TEM). In the early stages of sintering, CdSe/CdS nanocrystals approached each other at a distance of approximately 1–2 nm. As the exposure time to the electron beam increased, the movement of surface atoms on the nanocrystals led to contact between them. Subsequently, the atoms on the contact surfaces underwent rapid motion, resulting in the rapid formation of the neck between the particles. The neck formation between adjacent particles provides strong evidence of a sintering mechanism dominated by surface atom diffusion rather than Ostwald ripening. Further research in this area could lead to the development of improved methods to prevent sintering and enhance the stability of nanocrystals, ultimately contributing to the advancement of nanomaterial-based devices and materials with long-lasting performance.
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影响因子：
17.1
作者：
Just J;Coughlan C;Singh S;Ren H;Müller O;Becker P;Unold T;Ryan KM
通讯作者：
Ryan KM
影响因子：
9.5
作者：
Li, Xiao;You, Wenbin;Che, Renchao
通讯作者：
Che, Renchao
用于原位可控制造单个空心纳米结构的新型域限制生长策略
DOI：
10.1002/advs.201700213
发表时间：
2018-05
期刊：
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
影响因子：
--
作者：
Tang L;He L;Zhang L;Yu K;Xu T;Zhang Q;Dong H;Zhu C;Sun L
通讯作者：
Sun L
DOI：
10.3390/nano11123356
发表时间：
2021-12-10
期刊：
Nanomaterials (Basel, Switzerland)
影响因子：
--
作者：
Mizoshiri M;Yoshidomi K;Darkhanbaatar N;Khairullina EM;Tumkin II
通讯作者：
Tumkin II
影响因子：
10.8
作者：
Miszta, Karol;Greullet, Fanny;Krahne, Roman
通讯作者：
Krahne, Roman