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3D Motion of DNA-Au Nanoconjugates in Graphene Liquid Cell Electron Microscopy

Journal Article · · Nano Letters
DOI:https://doi.org/10.1021/nl402694n· OSTI ID:1545122
 [1];  [1];  [1];  [1];  [2];  [3];  [3];  [1]
  1. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
  2. Univ. of California, Berkeley, CA (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Sciences Division
Liquid-phase transmission electron microscopy (TEM) can probe and visualize dynamic events with structural or functional details at the nanoscale in a liquid medium. Prior efforts have focused on the growth and transformation kinetics of hard material systems, relying on their stability under electron beam. Our recently developed graphene liquid cell technique pushed the spatial resolution of such imaging to the atomic scale but still focused on growth trajectories of metallic nanocrystals. Here, we adopt this technique to imaging three-dimensional (3D) dynamics of soft materials instead, double strand (dsDNA) connecting Au nanocrystals as one example, at nanometer resolution. We show first that a graphene liquid cell can seal an aqueous sample solution of a lower vapor pressure than previously investigated well against the high vacuum in TEM. Then, from quantitative analysis of real time nanocrystal trajectories, we show that the status and configuration of dsDNA dictate the motions of linked nanocrystals throughout the imaging time of minutes. This sustained connecting ability of dsDNA enables this unprecedented continuous imaging of its dynamics via TEM. Moreover, the inert graphene surface minimizes sample-substrate interaction and allows the whole nanostructure to rotate freely in the liquid environment; we thus develop and implement the reconstruction of 3D configuration and motions of the nanostructure from the series of 2D projected TEM images captured while it rotates. In addition to further proving the nanoconjugate structural stability, this reconstruction demonstrates 3D dynamic imaging by TEM beyond its conventional use in seeing a flattened and dry sample. Altogether, we foresee the new and exciting use of graphene liquid cell TEM in imaging 3D biomolecular transformations or interaction dynamics at nanometer resolution.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
Defense Threat Reduction Agency (DTRA); National Science Foundation (NSF); USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1545122
Journal Information:
Nano Letters, Journal Name: Nano Letters Journal Issue: 9 Vol. 13; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (9)

Interaction Potentials of Anisotropic Nanocrystals from the Trajectory Sampling of Particle Motion using in Situ Liquid Phase Transmission Electron Microscopy journal March 2015
Protection of Molecular Microcrystals by Encapsulation under Single-Layer Graphene journal July 2018
Three-dimensional structural dynamics and fluctuations of DNA-nanogold conjugates by individual-particle electron tomography journal March 2016
Graphene-enabled electron microscopy and correlated super-resolution microscopy of wet cells journal June 2015
Imaging the polymerization of multivalent nanoparticles in solution journal October 2017
Hierarchical self-assembly of 3D lattices from polydisperse anisometric colloids journal April 2019
Intermediate states of molecular self-assembly from liquid-cell electron microscopy journal January 2020
Liquid cell transmission electron microscopy and its applications journal January 2020
Studying Dynamic Processes of Nano-sized Objects in Liquid using Scanning Transmission Electron Microscopy journal February 2017

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