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Nanocompression of 20 nm Silver Nanoparticles: In situ Aberration‐Corrected TEM and Atomistic Simulations

Journal Article · · Small
 [1];  [2];  [3];  [4];  [5];  [6];  [7]
  1. Univ. of Texas, Austin, TX (United States); Samsung Semiconductor, Austin, TX (United States)
  2. International Iberian Nanotechnology Laboratory (INL), Braga (Portugal); Inst. of Superior Tecnico (IST), Lisbon (Portugal)
  3. Univ. of Alicante (Spain)
  4. Univ. of California, Irvine, CA (United States)
  5. Brookhaven National Laboratory (BNL), Upton, NY (United States)
  6. Aix-Marseille Univ., Marseille (France); Univ. of Toulon, Marseille (France); Centre National de la Recherche Scientifique (CNRS), Marseille (France). Institut Matériaux Microélectronique Nanosciences de Provence (IM2NP)
  7. Univ. of Texas, Austin, TX (United States); International Iberian Nanotechnology Laboratory (INL), Braga (Portugal); Inst. of Superior Tecnico (IST), Lisbon (Portugal)
Single‐crystalline nanoparticles play an increasingly important role in a wide variety of fields including pharmaceuticals, advanced materials, catalysts for fuel cells, energy materials, as well as environmental detection and monitoring. Yet, the deformation mechanisms of very small nanoparticles are still poorly understood, in particular the role played by single dislocations and their interaction with surfaces. Here, in this work, silver nanoparticles with particularly small dimensions (≈20 nanometers in diameter) are compressed in situ in an aberration‐corrected transmission electron microscopy (TEM) and molecular dynamics (MD) simulations. During compression, the emergence of both dislocations and nanotwins are observed. However, these defects prove to be unstable and disappear upon removal of the indenter. Atomistic simulations confirm the role played by image stresses associated with the nearby surfaces and the reduction in dislocation line length as it approaches the free surface, thereby supporting the experimental observations. These results provide justification for the frequent observation of the absence of dislocations in nanoparticles of a few nanometers in size during in situ experiments, even after significant deformation. This phenomenon contributes to the self‐healing of samples through dislocation ejection toward the surfaces.
Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
Agence Nationale de la Recherche (ANR); Fundação para a Ciência e a Tecnologia (FCT); Generalitat Valenciana; Spanish Ministerio de Educación, Cultura y Deporte; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
SC0012704
OSTI ID:
2566988
Report Number(s):
BNL--228187-2025-JAAM
Journal Information:
Small, Journal Name: Small Journal Issue: 4 Vol. 21; ISSN 1613-6810; ISSN 1613-6829
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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