Dealloying Kinetics of AgAu Nanoparticles by In Situ Liquid-Cell Scanning Transmission Electron Microscopy
- Pan Liu*Pan Liu*E-mail: [email protected]Shanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, ChinaState Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, ChinaWPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, JapanMore by Pan Liu,
- Qing Chen*Qing Chen*E-mail: [email protected]Department of Mechanical and Aerospace Engineering, Department of Chemistry, and The Energy Institute, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong KongMore by Qing Chen,
- Yoshikazu ItoYoshikazu ItoInstitute of Applied Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8573, JapanMore by Yoshikazu Ito,
- Jiuhui HanJiuhui HanWPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, JapanMore by Jiuhui Han,
- Shufen ChuShufen ChuShanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, ChinaMore by Shufen Chu,
- Xiaodong WangXiaodong WangShanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, ChinaState Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, ChinaMore by Xiaodong Wang,
- Kolan Madhav ReddyKolan Madhav ReddyShanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, ChinaState Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, ChinaMore by Kolan Madhav Reddy,
- Shuangxi SongShuangxi SongShanghai Key Laboratory of Advanced High-Temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, ChinaState Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030, ChinaMore by Shuangxi Song,
- Akihiko HirataAkihiko HirataWPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, JapanMore by Akihiko Hirata, and
- Mingwei Chen*Mingwei Chen*E-mail: [email protected]WPI Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, JapanDepartment of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United StatesMore by Mingwei Chen
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.
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