Nanocomposites and nanomaterials

Synthesis and application of NOBOW derivatives as helical  matrix for self-assembly of nanoparticles
Szymańska P. 1, Bagiński M.1, Lewandowski W.1
1 Faculty of Chemistry, University of Warsaw, Pasteura 1 Street, 02-093 Warsaw, Poland
E-mail: p.szymanska11@student.uw.edu.pl

Achieving nanostructures with a helical geometry was found to be interesting throught the last decades owing to their central role in natural systems, excellent structural stability, and inherent chirality. Recently, extremely dynamically developing research area has been obtaining helical assemblies of nanoparticles (NPs) that combine a helical topology with the unique plasmonic properties of NPs. Such structures open a wide perspectives due to their applications in information storage, chiral plasmonic, biosensing and metamaterial technologies[1]. So far helical assemblies of nanoparticles were prepared mainly based on the use of various type organic templates (mainly biomolecules like peptides and DNA or polimers) [2], chiral ligands and cularly polarized light. Unfortunately, these strategies are always limited to solutions and usually also to only one type of NPs. Therefore, developing new methods for achieving such architectures also in nonsolvated environments is necessary for practical application of these materials. Recently our group, developed a new solvent-free strategy in which interactions between liquid-crystalline (LC) matrix and gold NPs covered with structurally similar mesogenic ligands afford the formation of hierarchical helical nanostructures in thin films [3].
	In my current work, I am trying to develop this approach by using as helical matrix a series of NOBOW derivatives with various terminal chains. On the one hand these studies show how structural compatibility between organic template and nanoparticles surface ligands affect on self-assembly process, on the other hand we would like to check if by varying structure of helical template we can control structural parameters of obtained helical assemblies.

1.	 J. Kumar, K.G. Thomas, L.M. Marzan, Chemical Communications, 52 (2016) 12555.
2.	 X. Shen, C. Song, J. Wang, D. Shi, Z. Wang, N. Liu, B. Ding, Journal of American Chemical Society, 134 (2012) 146-149.
3.	 M. Bagiński, M. Tupkikowska, G. Gonzales-Rubio, M. Wójcik, W. Lewandowski, Advanced Materials, 32 (2020) 1904581.