In situ study of nucleation and growth dynamics of Au nanoparticles on MoS2 nanoflakes
Abstract
Two-dimensional (2D) substrates decorated with metal nanoparticles offer new opportunities to achieve high-performance catalytic behavior. However, little is known on how the substrates control the nucleation and growth processes of the nanoparticles. This paper presents the visualization of dynamic nucleation and growth processes of gold nanoparticles on ultrathin MoS2 nanoflakes by in situ liquid-cell transmission electron microscopy (TEM). The galvanic displacement resulting in Au nuclei formation on MoS2 was observed in real time inside the liquid cell. We found that the growth mechanism of Au particles on pristine MoS2 is in between diffusion-limited and reaction-limited, possibly due to the presence of electrochemical Ostwald ripening. A larger size distribution and more orientation variation is observed for the Au particles along the MoS2 edge than on the interior. Differing from pristine MoS2, sulfur vacancies on MoS2 induce Au particle diffusion and coalescence during the growth process. Density functional theory (DFT) calculations show that the size difference is because the exposed molybdenum atoms at the edge with dangling bonds can strongly interact with Au atoms, whereas sulfur atoms on the MoS2 interior have no dangling bonds and weakly interact with gold atoms. In addition, S vacancies on MoS2 generate strong nucleation centers thatmore »
- Authors:
-
[1];
[1];
[3];
[4];
[1]
- Univ. of Illinois at Chicago, Chicago, IL (United States)
- Univ. of Illinois at Chicago, Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Univ. of Pittsburgh, Pittsburgh, PA (United States)
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- National Science Foundation (NSF); University of Pittsburgh; USDOE
- OSTI Identifier:
- 1472115
- Alternate Identifier(s):
- OSTI ID: 1464297
- Grant/Contract Number:
- AC02-06CH11357; 4J-30361
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nanoscale
- Additional Journal Information:
- Journal Volume: 10; Journal Issue: 33; Journal ID: ISSN 2040-3364
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 77 NANOSCIENCE AND NANOTECHNOLOGY; 2D materials; DFT simulation; coalescence; electrochemical Ostwald ripening; galvanic displacement; in situ TEM; kinetic modeling; nucleation and growth
Citation Formats
Song, Boao, He, Kun, Yuan, Yifei, Sharifi-Asl, Soroosh, Cheng, Meng, Lu, Jun, Saidi, Wissam A., and Shahbazian-Yassar, Reza. In situ study of nucleation and growth dynamics of Au nanoparticles on MoS2 nanoflakes. United States: N. p., 2018.
Web. doi:10.1039/C8NR03519A.
Song, Boao, He, Kun, Yuan, Yifei, Sharifi-Asl, Soroosh, Cheng, Meng, Lu, Jun, Saidi, Wissam A., & Shahbazian-Yassar, Reza. In situ study of nucleation and growth dynamics of Au nanoparticles on MoS2 nanoflakes. United States. https://doi.org/10.1039/C8NR03519A
Song, Boao, He, Kun, Yuan, Yifei, Sharifi-Asl, Soroosh, Cheng, Meng, Lu, Jun, Saidi, Wissam A., and Shahbazian-Yassar, Reza. Thu .
"In situ study of nucleation and growth dynamics of Au nanoparticles on MoS2 nanoflakes". United States. https://doi.org/10.1039/C8NR03519A. https://www.osti.gov/servlets/purl/1472115.
@article{osti_1472115,
title = {In situ study of nucleation and growth dynamics of Au nanoparticles on MoS2 nanoflakes},
author = {Song, Boao and He, Kun and Yuan, Yifei and Sharifi-Asl, Soroosh and Cheng, Meng and Lu, Jun and Saidi, Wissam A. and Shahbazian-Yassar, Reza},
abstractNote = {Two-dimensional (2D) substrates decorated with metal nanoparticles offer new opportunities to achieve high-performance catalytic behavior. However, little is known on how the substrates control the nucleation and growth processes of the nanoparticles. This paper presents the visualization of dynamic nucleation and growth processes of gold nanoparticles on ultrathin MoS2 nanoflakes by in situ liquid-cell transmission electron microscopy (TEM). The galvanic displacement resulting in Au nuclei formation on MoS2 was observed in real time inside the liquid cell. We found that the growth mechanism of Au particles on pristine MoS2 is in between diffusion-limited and reaction-limited, possibly due to the presence of electrochemical Ostwald ripening. A larger size distribution and more orientation variation is observed for the Au particles along the MoS2 edge than on the interior. Differing from pristine MoS2, sulfur vacancies on MoS2 induce Au particle diffusion and coalescence during the growth process. Density functional theory (DFT) calculations show that the size difference is because the exposed molybdenum atoms at the edge with dangling bonds can strongly interact with Au atoms, whereas sulfur atoms on the MoS2 interior have no dangling bonds and weakly interact with gold atoms. In addition, S vacancies on MoS2 generate strong nucleation centers that can promote diffusion and coalescence of Au nanoparticles. Furthermore, the present work provides key insights into the role of 2D materials in controlling the size and orientation of noble metal nanoparticles vital to the design of next generation catalysts.},
doi = {10.1039/C8NR03519A},
journal = {Nanoscale},
number = 33,
volume = 10,
place = {United States},
year = {2018},
month = {7}
}
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