@article{4e57824834de49d4a50c4f2507833cf5,
title = "Dealloying Kinetics of AgAu Nanoparticles by in Situ Liquid-Cell Scanning Transmission Electron Microscopy",
abstract = "Understanding the formation and evolution of bicontinuous nanoporous structure during dealloying has been one of the most challenging subjects of dealloying research. However, previous in situ investigations either suffer from insufficient spatial resolution (e.g., X-ray tomography) or lack morphology visualization and mass information (e.g., scanning tunneling microscopy). In this work, we report the kinetics of the whole course of dealloying by utilizing liquid-cell aberration-corrected scanning transmission electron microscopy. With Z-contrast imaging analysis, the in situ sub-nanoscale characterization reveals two new phenomena, an initial period of dealloying indicative of an initial length scale for bulk dealloying and a large volume shrinkage in a nanoscale alloy precursor. We explain the particle-size-dependent volume shrinkage with the formation of a dense shell and quantify the dependence with a simple geometric model. These insights into the mechanisms of dealloying will enable deliberate designs of nanoporous structures.",
keywords = "Dealloying, In situ liquid-cell STEM, Initial length scale, Nanoporous gold, Volume shrinkage",
author = "Pan Liu and Qing Chen and Yoshikazu Ito and Jiuhui Han and Shufen Chu and Xiaodong Wang and Reddy, {Kolan Madhav} and Shuangxi Song and Akihiko Hirata and Mingwei Chen",
note = "Funding Information: This work was supported by Natural Science Foundation of China (51821001, 11704245), Natural Science Foundation of Shanghai (19ZR1475200), and MOST 973 of China (2015CB856800). M.C. is sponsored by the Whiting School of Engineering, Johns Hopkins University. Q.C. acknowledges the support from Research Grant Council of the Hong Kong Special Administrative Region, China, under Project 26201217. P.L. is supported by the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning. This work was partially sponsored by JSPS KAKENHI (Grant Number JP25886002), JST-CREST “Interface Science for Highly Efficient Energy Utilization”, JST, and “World Premier International Research Center (WPI) Initiative” by MEXT, Japan. Publisher Copyright: {\textcopyright} 2020 American Chemical Society.",
year = "2020",
month = mar,
day = "11",
doi = "10.1021/acs.nanolett.9b05216",
language = "English",
volume = "20",
pages = "1944--1951",
journal = "Nano Letters",
issn = "1530-6984",
publisher = "American Chemical Society",
number = "3",
}