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Rehn SM, Gerrard-Anderson TM, Chen Y, Wang P, Robertson T, Senftle TP, Jones MR. Surface Ligands Dictate the Mechanical Properties of Inorganic Nanomaterials. ACS NANO 2023; 17:6698-6707. [PMID: 36971281 DOI: 10.1021/acsnano.2c12497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
The ability for organic surface chemistry to influence the properties of inorganic nanomaterials is appreciated in some instances but is poorly understood in terms of mechanical behavior. Here we demonstrate that the global mechanical strength of a silver nanoplate can be modulated according to the local binding enthalpy of its surface ligands. A continuum-based core-shell model for nanoplate deformation shows that the interior of a particle retains bulk-like properties while the surface shell has yield strength values that depend on surface chemistry. Electron diffraction experiments reveal that, relative to the core, atoms at the nanoplate surface undergo lattice expansion and disordering directly related to the coordinating strength of the surface ligand. As a result, plastic deformation of the shell is more difficult, leading to an enhancement of the global mechanical strength of the plate. These results demonstrate a size-dependent coupling between chemistry and mechanics at the nanoscale.
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Po H, Dabard C, Roman B, Reyssat E, Bico J, Baptiste B, Lhuillier E, Ithurria S. Chiral Helices Formation by Self-Assembled Molecules on Semiconductor Flexible Substrates. ACS NANO 2022; 16:2901-2909. [PMID: 35107969 DOI: 10.1021/acsnano.1c09982] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The crystal structure of atomically defined colloidal II-VI semiconductor nanoplatelets (NPLs) induces the self-assembly of organic ligands over thousands of square nanometers on the top and bottom basal planes of these anisotropic nanoparticles. NPLs curl into helices under the influence of the surface stress induced by these ligands. We demonstrate the control of the radii of NPL helices through the ligands described as an anchoring group and an aliphatic chain of a given length. A mechanical model accounting for the misfit strain between the inorganic core and the surface ligands predicts the helices' radii. We show how the chirality of the helices can be tuned by the ligands anchoring group and inverted from one population to another.
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Affiliation(s)
- Hong Po
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université UPMC Univ Paris 06, CNRS, 10 rue Vauquelin 75005 Paris, France
| | - Corentin Dabard
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université UPMC Univ Paris 06, CNRS, 10 rue Vauquelin 75005 Paris, France
| | - Benoit Roman
- Physique et Mécanique des Milieux Hétérogènes, ESPCI-Paris, PSL Research University, CNRS, Sorbonne Université, Université de Paris, 75005 Paris, France
| | - Etienne Reyssat
- Physique et Mécanique des Milieux Hétérogènes, ESPCI-Paris, PSL Research University, CNRS, Sorbonne Université, Université de Paris, 75005 Paris, France
| | - José Bico
- Physique et Mécanique des Milieux Hétérogènes, ESPCI-Paris, PSL Research University, CNRS, Sorbonne Université, Université de Paris, 75005 Paris, France
| | - Benoit Baptiste
- Sorbonne Université, CNRS, Institut de minéralogie, de physique des matériaux et de cosmochimie, IMPMC, F-75005 Paris, France
| | - Emmanuel Lhuillier
- Sorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, F-75005 Paris, France
| | - Sandrine Ithurria
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université UPMC Univ Paris 06, CNRS, 10 rue Vauquelin 75005 Paris, France
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