Micelle-Assisted and Covalent Bonding-Mediated Formation of Nanoparticle Superlattices

by Prof. Sung-Min Choi (Department of Nuclear and Quantum Engineering, KAIST)

Monday 17 May 2021, 14:30 → 15:30 Europe/Berlin

Zoom Webinar

The nanoparticle superlattices (NPSLs) can exhibit new emerging properties through collective coupling between nanoparticles, which is dependent on the lattice symmetry and particle composition, providing new opportunities in a broad range of potential applications including plasmonic, optoelectronic, and catalytic applications. Various methods have been developed for the synthesis of NPSLs, which include slow solvent evaporation, antisolvent destabilization, DNA-mediation, electrostatic interaction and others. In our group, two different approaches to form NPSLs, the micelle-assisted method and the covalent bonding-mediated method, have been developed. The micelle-assisted method has been applied to 1D nanoparticles (single-walled carbon nanotubes) and spherical gold nanoparticles with which thermally reversible structural symmetry transitions of NPSLs have been demonstrated. Recently the covalent bonding-mediated method has been used to form gold nanoparticle superlattices which are very stable in solvent of different polarity as well as in a dried condition. In this presentation, small angle neutron and x-ray scattering investigations of these self-assembled NPSLs will be discussed.     

 

[1] S.-H. Lim, H.-S. Jang, J.-M. Ha, T.-H. Kim, P. Kwasniewski, T. Narayanan, K-S Jin an S.M Choi, "Highly Ordered and Highly Aligned Two-Dimensional Binary Superlattice of a SWNT/Cylindrical-Micellar System", Angew. Chem. Int. Ed., 53, 12548 (2014)

[2] S.-H. Lim, T. Lee, Y. Oh, T. Narayanan, B. J. Sung and S.-M. Choi*, “Hierarchically Self-Assembled Hexagonal Honeycomb and Kagome Superlattices of Binary 1D Colloids”, Nature Communications 8, 360 (2017)

[3] J.-M. Ha, S.-H. Lim, J. Dey, S.-J. Lee, M.-J. Lee, S.-H. Kang, K. S. Jin, and S.-M. Choi*, “Micelle-Assisted Formation of Nanoparticle Superlattices and Thermally Reversible Symmetry Transitions”, Nano Letters 19, 2313, (2019)

[4] J. Dey, S.-J. Lee, J. Kim, S.-H. Lim, J.-M. Ha, M.-J. Lee, and S.-M. Choi*, "Spontaneous Formation of Highly Stable Nanoparticle Supercrystals Driven by a Covalent Bonding Interaction", Nano Letters, 21, 258 (2021)