文献类型：期刊文献

英文题名：Direct Observation of Growth and Self-assembly of Pt Nanoclusters in Water with the Aid of a Triblock Polymer Using in situ Liquid Cell Transmission Electron Microscopy (TEM)

作者：Chen, Xin[1,2,3];Li, Chang[1,2];Kong, Xing[1,2];Cao, Hongliang[1,2,4];Wang, Hulian[1,2];Zhou, Xiaoqin[1,2]

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]Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, State Key Lab Funct Mat Informat, Shanghai 200050, Peoples R China;[4]East China Univ Sci & Technol, Biomed Nanotechnol Ctr, State Key Lab Bioreactor Engn, Shanghai 200237, Peoples R China

年份：2017

卷号：35

期号：8

起止页码：1278

外文期刊名：CHINESE JOURNAL OF CHEMISTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000407852800010)】；

基金：The authors thank Prof. S. Dillon and Dr. J. G. Wen from University of Illinois at Urbana-Champaign for the help. The support from the Shanghai Leading Academic Discipline Project (B502), the Shanghai Key Laboratory Project (No. 08DZ2230500), the Science and Technology Commission of Shanghai Municipality Project (No. 11nm0507000), the State Key Laboratory of Functional Materials for Informatics Open Project (No. SKL201306), and the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry are acknowledged.

语种：英文

外文关键词：in situ liquid cell TEM; electron beam induced growth; self-assembly; Pt; triblock copolymer

摘要：Triblock copolymers are playing important roles in nanomaterial synthesis, and the nanomaterial forming mechanisms need to be studied in detail. In situ liquid cell transmission electron microscopy (TEM) is a powerful tool for real time observation of the dynamic growth behavior of nanomaterials in liquid with high resolution, and could be used for the above task. Here we report the observation of the growth and self-assembly of Pt nanoclusters with the aid of an ethylene oxide-propylene oxide-ethylene oxide triblock copolymer (PEO-PPO-PEO) F127 using in situ liquid cell TEM, with the nanocluster growth and formation procedures being tracked. Nano objects were seen to appear, drift and rotate with time, and then form into certain shaped nanoclusters under the electron beam irradiation. Further interestingly, in the thicker liquid layer region, the nanoclusters appeared to be fluffy, with average size keeping increase with time, while in the thinner region, the clusters were thinner, and got densified with time. The difference in precursor availability due to liquid layer thickness and charging effects is attributed to such a phenomenon.