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- Title
Hydrogen-bonded structure and mechanical chiral response of a silver nanoparticle superlattice.
- Authors
Yoon, Bokwon; Luedtke, W. D.; Barnett, Robert N.; Gao, Jianping; Desireddy, Anil; Conn, Brian E.; Bigioni, Terry; Landman, Uzi
- Abstract
Self-assembled nanoparticle superlattices-materials made of inorganic cores capped by organic ligands, of varied structures, and held together by diverse binding motifs-exhibit size-dependent properties as well as tunable collective behaviour arising from couplings between their nanoscale constituents. Here, we report the single-crystal X-ray structure of a superlattice made in the high-yield synthesis of Na4Ag44(p-MBA)30 nanoparticles, and find with large-scale quantum-mechanical simulations that its atomically precise structure and cohesion derive from hydrogen bonds between bundledp-MBA ligands. We also find that the superlattice's mechanical response to hydrostatic compression is characterized by a molecular-solid-like bulk modulus B0 = 16.7 GPa, exhibiting anomalous pressure softening and a compression-induced transition to a soft-solid phase. Such a transition involves ligand flexure, which causes gear-like correlated chiral rotation of the nanoparticles. The interplay of compositional diversity, spatial packing efficiency, hydrogen-bond connectivity, and cooperative response in this system exemplifies the melding of the seemingly contrasting paradigms of emergent behaviour 'small is different' and 'more is different'.
- Subjects
NANOPARTICLES; SUPERLATTICES; SINGLE crystals; DIMETHYLFORMAMIDE; X-ray crystallography
- Publication
Nature Materials, 2014, Vol 13, Issue 8, p807
- ISSN
1476-1122
- Publication type
Article
- DOI
10.1038/nmat3923