文献类型：期刊文献

英文题名：Synergy between Structure Characteristics and the Solution Chemistry in a Near/Non-Equilibrium Oxidative Etching of Penta-Twinned Palladium Nanorods

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, Key Lab Ultrafine Mat, Minist Educ, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Shanghai Key Lab Adv Polymer Mat, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[3]Zhejiang Univ, State Key Lab Silicon Mat, Sch Mat Sci & Engn, 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：2021

卷号：125

期号：7

起止页码：4010

外文期刊名：JOURNAL OF PHYSICAL CHEMISTRY C

收录：;EI(收录号：20210909992782);WOS:【SCI-EXPANDED(收录号:WOS:000624451700035)】；

基金：We acknowledge Profs. H. Zhang, R. Tang, Dr. Y. Jiang, and Dr. Y. Yan for fruitful discussions and assistance. 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, and the 111 project under Grant No. B16042. The authors in Shanghai acknowledge the Shanghai Leading Academic Discipline Project (No. B502) and the Shanghai Key Laboratory Project (No. 08DZ2230500) for financial support. F.L. acknowledges financial support by the National Natural Science Foundation of China under Grant Nos. 61971201 and 61571197. The work on electron microscopy was done at the Center of Electron Microscopy of Zhejiang University. We also acknowledge Gatan Inc. for the Gatan OneView camera demo at the center of Electron Microscopy of Zhejiang University.

语种：英文

外文关键词：Morphology - Palladium - Synthesis (chemical) - Sols - Surface structure - High resolution transmission electron microscopy - Chlorination - Nanorods - Sodium chloride - Iron compounds

摘要：Oxidative etching possesses an enriched flexibility and atomic-level accuracy in tailoring the size, morphology, surface structure, and composition of colloidal nanocrystals toward their catalytic and sensing applications. In this work, we choose one-dimensional penta-twinned Pd nanorods as a model system and apply liquid cell transmission electron microscopy (LCTEM) to investigate the detailed nanoscale etching process under different solution environments, which are DI water/e-beam (weakly oxidative), sodium chloride (NaCl) solution/e-beam (moderately oxidative), and ferric chloride (FeCl3) solution/e-beam (strongly oxidative), respectively. Increasing the oxidative strength of solution alone accelerates the dissolution kinetics and drives the system from the (near)-equilibrium etching, where nanorods appear in flat and low-indexed ends (for DI water/e-beam) to nonequilibrium etching with slender tips formed as intermediate products (for FeCl3/e-beam). Under a nonequilibrium etching condition, both symmetric and asymmetric etching occurred, that is, the penta-twinned structure either retained (for symmetric etching) or dissolved to a fourfold-, threefold-, and twofold-twinned and single-crystalline structure (for asymmetric etching), depending on the structural defects-induced strain distribution. The formation of slender tips of different structures can be further understood via energetic analysis and strain relaxation. In particular, in situ LCTEM results were successfully reproduced by flask system-based etching experiments; hence, direct correlations were built between LCTEM and conventional colloidal etching reactions. This work comprehends the present understanding on the synergetic roles of structure characteristics and solution chemistry for the etching of multiply twinned nanoparticles toward their precise controlled synthesis and practical applications.