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Direct Visualization of Photomorphic Reaction Dynamics of Plasmonic Nanoparticles in Liquid by Four-Dimensional Electron Microscopy

Fu, Xuewen and Chen, Bin and Li, Caizhen and Li, Heng and Liao, Zhi-Min and Yu, Dapeng and Zewail, Ahmed H. (2018) Direct Visualization of Photomorphic Reaction Dynamics of Plasmonic Nanoparticles in Liquid by Four-Dimensional Electron Microscopy. Journal of Physical Chemistry Letters, 9 (14). pp. 4045-4052. ISSN 1948-7185. https://resolver.caltech.edu/CaltechAUTHORS:20180706-100757820

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[img] Video (AVI) (Movie S1: 1 kHz fs-laser pulse-induced continuous aggregation of AuNPs in liquid cell at a fluence of 3.3 mJ/cm2) - Supplemental Material
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[img] Video (AVI) (Movie S5: Continuous electron imaging of AuNP agglomeration and fusion process under intensive laser pulse excitation shot-by-shot at a fluence of 33 mJ/cm2) - Supplemental Material
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Abstract

Liquid-cell electron microscopy (LC-EM) provides a unique approach for in situ imaging of morphology changes of nanocrystals in liquids under electron beam irradiation. However, nanoscale real-time imaging of chemical and physical reaction processes in liquids under optical stimulus is still challenging. Here, we report direct observation of photomorphic reaction dynamics of gold nanoparticles (AuNPs) in water by liquid-cell four-dimensional electron microscopy (4D-EM) with high spatiotemporal resolution. The photoinduced agglomeration, coalescence, and fusion dynamics of AuNPs at different temperatures are studied. At low laser fluences, the AuNPs show a continuous aggregation in several seconds, and the aggregate size decreases with increasing fluence. At higher fluences close to the melting threshold of AuNPs, the aggregates further coalesced into nanoplates. While at fluences far above the melting threshold, the aggregates fully fuse into bigger NPs, which is completed within tens of nanoseconds. This liquid-cell 4D-EM would also permit study of other numerical physical and chemical reaction processes in their native environments.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1021/acs.jpclett.8b01360DOIArticle
https://pubs.acs.org/doi/suppl/10.1021/acs.jpclett.8b01360PublisherSupporting Information
ORCID:
AuthorORCID
Fu, Xuewen0000-0001-6116-4680
Liao, Zhi-Min0000-0001-6361-9626
Alternate Title:Direct Visualization of Photomorphic Reaction Dynamics of Plasmonic Nanoparticles in Liquid by 4D Electron Microscopy
Additional Information:© 2018 American Chemical Society. Received: April 29, 2018; Accepted: July 5, 2018; Published: July 5, 2018. This work was partially supported by the Air Force Office of Scientific Research Grant FA9550-11-1-0055S for research conducted in The Gordon and Betty Moore Center for Physical Biology at California Institute of Technology, and the National Key Research and Development Program of China (No. 2016YFA0300802) and NSFC (No. 11234001). We would like to thank J. S. Baskin and Mohammed Th. Hassan for help on setting the femtosecond laser system. We thank Mohammed Th. Hassan for help on PINEM measurement. We also wish to thank J. Tang for fruitful discussion. Author Contributions: A.H.Z. and X.F. proposed and designed the project; X.F., B.C., and C.L. performed the experiment; X.F. and B.C. analyzed the experimental data; all authors contributed to the discussion and writing of the manuscript. The authors declare no competing financial interest.
Funders:
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)FA9550-11-1-0055S
Gordon and Betty Moore FoundationUNSPECIFIED
National Key Research and Development Program of China2016YFA0300802
National Natural Science Foundation of China11234001
Subject Keywords:Photomorphic reaction, Nanoparticle agglomeration, Nanoparticle fusion, 4D electron microscopy, Imaging in liquids
Issue or Number:14
Record Number:CaltechAUTHORS:20180706-100757820
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180706-100757820
Official Citation:Direct Visualization of Photomorphic Reaction Dynamics of Plasmonic Nanoparticles in Liquid by Four-Dimensional Electron Microscopy. Xuewen Fu, Bin Chen, Caizhen Li, Heng Li, Zhi-Min Liao, Dapeng Yu, and Ahmed H. Zewail. The Journal of Physical Chemistry Letters 2018 9 (14), 4045-4052 DOI: 10.1021/acs.jpclett.8b01360
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87588
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:06 Jul 2018 17:36
Last Modified:03 Oct 2019 19:57

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