Shape-controlled synthesis and in situ characterisation of anisotropic Au nanomaterials using liquid cell transmission electron microscopy

Wang, Shih-Ting; Lin, Yiyang; Nielsen, Michael H.; Song, Cheng Yu; Thomas, Michael R.; Spicer, Christopher D.; Kröger, Roland; Ercius, Peter; Aloni, Shaul; Stevens, Molly M.

doi:10.1039/c9nr01474h

Title: Shape-controlled synthesis and in situ characterisation of anisotropic Au nanomaterials using liquid cell transmission electron microscopy

Journal Article · 30 August 2019 · Nanoscale

DOI: https://doi.org/10.1039/c9nr01474h · OSTI ID:1561948

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^[2]; Song, Cheng Yu ^[3];

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^[3]; Aloni, Shaul ^[3];

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Imperial College, London (United Kingdom)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry
Univ. of York, Heslington (United Kingdom)

Understanding the mechanisms behind crystal nucleation and growth is a fundamental requirement for the design and production of bespoke nanomaterials with controlled sizes and morphologies. In this work, we select gold (Au) nanoparticles as the model system for our study due to their representative applications in biology, electronics and optoelectronics. We investigate the radiation-induced in situ growth of gold (Au) particles using liquid cell transmission electron microscopy (LCTEM) and study the growth kinetics of non-spherical Au structures. Under controlled electron fluence, liquid flow rate and Au³⁺ ion supply, we show the favoured diffusion-limited growth of multi-twinned nascent Au seed particles into branched structures when using thin liquid cells (100 nm and 250 nm) in LCTEM, whereas faceted structures (e.g., spheres, rods, and prisms) formed when using a 1 μm thick liquid cell. In addition, we observed that anisotropic Au growth could be modulated by Au-binding amyloid fibrils, which we ascribe to their capability to regulate Au³⁺ ion diffusion and mass transfer in solution. We anticipate that this study will provide new perspectives on the shape-controlled synthesis of anisotropic metallic nanomaterials using LCTEM.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). The Molecular Foundry (TMF); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); Taiwan Strategic Alliance Scholarship; Engineering and Physical Sciences Research Council (EPSRC); Lawrence Fellowship; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-05CH11231; AC52-07NA27344

OSTI ID:: 1561948

Report Number(s):: LLNL-JRNL--805912; ark:/13030/qt5qz910p9

Journal Information:: Nanoscale, Journal Name: Nanoscale Journal Issue: 36 Vol. 11; ISSN NANOHL; ISSN 2040-3364

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Liquid cell TEM
amyloid fibrils.
branched structures
diffusion-limited growth
in situ growth

Title: Shape-controlled synthesis and in situ characterisation of anisotropic Au nanomaterials using liquid cell transmission electron microscopy

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