文献类型：期刊文献

英文题名：Unveiling Growth Pathways of Multiply Twinned Gold Nanoparticles by In Situ Liquid Cell Transmission Electron Microscopy

作者：Ma, Xiaoming[1,2,3];Lin, Fang[4];Chen, Xin[1,2];Jin, Chuanhong[3,5]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Shanghai 200237, Peoples R China;[3]Zhejiang Univ, Sch Mat Sci & Engn, State Key Lab Silicon Mat, Hangzhou 310027, Zhejiang, Peoples R China;[4]South China Agr Univ, Coll Elect Engn, Guangzhou 510642, Guangdong, Peoples R China;[5]Xiangtan Univ, Hunan Inst Adv Sensing & Informat Technol, Xiangtan 411105, Hunan, Peoples R China

年份：2020

卷号：14

期号：8

起止页码：9594

外文期刊名：ACS NANO

收录：;EI(收录号：20204209349711);WOS:【SCI-EXPANDED(收录号:WOS:000566341000028)】；

基金：This work was financially supported by the National Natural Science Foundation of China under Grant Nos. 51772265, 51761165024, 61721005, and 21875066, the Zhejiang Provincial Natural Science Foundation under Grant No. D19E020002, the 111 project under Grant No. B16042, the Shanghai Leading Academic Discipline Project (No. B502), and the Shanghai Key Laboratory Project (No. 08DZ2230500). The work on electron microscopy was done at the Center of Electron Microscopy of Zhejiang University. F.L. acknowledged financial support by the National Natural Science Foundation of China under Grant Nos. 61971201 and 61571197.

语种：英文

外文关键词：Au decahedral/icosahedral nanostructures; multiply twinned nanoparticle; nucleation-based growth; successive twinning growth; liquid cell TEM; growth kinetics; strain relaxation

摘要：A mechanistic understanding of the growth of multiply twinned nanoparticles (MTPs), such as decahedra (Dh) and icosahedra (Ih), is crucial for precisely controlled syntheses and applications. Despite previous successes, no consensus has been reached regarding the multiple competing growth pathways for MTPs proposed thus far, in part due to the lack of information about their nucleation and growth dynamics. Here, we used decahedral and icosahedral gold nanoparticles as a model system in conjunction with in situ liquid cell transmission electron microscopy (LCTEM) to investigate the nucleation and growth dynamics of MTPs in aqueous solution; two growth pathways were successfully identified: (A) nucleation-based layer-by-layer growth from a rounded multiply twinned seed and (B) the successive twinning and growth of tetrahedra. The LCTEM results enabled us to directly and conclusively identify the growth behaviors of intermediate products. The internal strain relaxation mechanisms and growth kinetics differ for the two pathways: in pathway A, a MTP grew by the opening and closing of re-entrant grooves at the twin boundaries, which was not found in pathway B. We also analyzed different MTP growth pathways from an energetic perspective and discussed how the preferred pathway (A or B) is related to factors, such as the initial seed yield and the size-and morphology-dependent formation of MTPs. Our results contextualize the current understanding of MTP formation mechanisms and provide insightful guidance for the precisely controlled synthesis of MTPs for practical applications.