Journal
ANALYTICAL CHEMISTRY
Volume 93, Issue 5, Pages 2871-2878Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.0c04264
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Funding
- National Research Foundation of Korea - Ministry of Science, ICT and Future Planning [NRF-2020R1A2C2013790, NRF-2019M3E6A1065038, NRF-2016M1A2A2936638]
- KIST Institutional Program [2Z05790-19-037]
- Korea Basic Science Institute (KBSI) [C030221]
- National Research Council of Science & Technology - Korea government [CRC-16-01-KRICT]
- National Research Council of Science & Technology (NST), Republic of Korea [C030221] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study utilized 3-D electron tomography to visualize dendrimer-encapsulated Pt nanoparticles, revealing their intricate structural characteristics. The encapsulation features of Pt DENs were further verified through selective electrochemical poisoning experiments, providing more accurate nanoparticle size distributions compared to conventional 2-D transmission electron microscopy analysis.
Here, we report three-dimensional (3-D) visualization of dendrimer-encapsulated Pt nanoparticles (Pt DENs) by using 3-D electron tomography to reveal intricate structural characteristics of their whole organic-inorganic hybrid nanostructure. We reconstructed the 3-D spatial volume of Pt DENs by back-projecting a tilt series of two-dimensional (2-D) projections of Pt nanoparticles encapsulated inside dendrimers negatively stained with uranyl acetate. The direct 3-D visualization of Pt DENs elucidated their encapsulation characteristics with the spatial imaging of Pt nanoparticles embraced inside dendrimers in three dimensions. The encapsulation characteristics of Pt DENs were further verified with selective electrochemical poisoning experiments. In addition, quantitative 3-D structural characterization of Pt DENs provided more accurate and precise size distributions of nanoparticles than those obtained from conventional 2-D transmission electron microscopy analysis relying only on a 3-D structure projected on a 2-D plane.
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