Universität zu Köln

Schuetz, Markus B., Ilyas, Shaista, Le, Khan, Valldor, Martin and Mathur, Sanjay ORCID: 0000-0003-2765-2693 (2020). Nanoparticle Arrays Having Directed Hybrid Topology via Covalent Self-Assembly of Iron Oxide and Silica Nanoparticles. ACS Appl. Nano Mater., 3 (6). S. 5936 - 5944. WASHINGTON: AMER CHEMICAL SOC. ISSN 2574-0970

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Abstract

Combining individual nanoparticles (NPs) of different chemical composition and surface chemistry offers an unexplored synthetic avenue for unifying different functionalities into a topologically defined hybrid structure. In this study, multiparticle architectures (alpha-Fe2O3@SiO2, alpha-Fe2O3@gamma-Fe2O3) were fabricated by a directed self-assembly of nanoparticles carrying complementary surface ligands suitable for click chemistry. For this purpose, the surface-rooted hydroxyl groups of freshly prepared alpha-Fe2O, gamma-Fe2O3, and SiO2 nanoparticles were utilized for facile conjugation of organic ligands, 4-(azidoacetyl)-catechol, and 10-undecynoic acid to subsequently perform copper catalyzed reactions. This work explores specific chemical interactions among functionalized nanopartides of different sizes and compositions to create nanoparticle assemblies with hybrid topologies. Here, developed on-surface chemistry protocols demonstrate that chemical specificity known for dick-chemistry protocols among molecular species is equally effective between the ligands grafted on the surface of nanoparticles. Owing to the presence of active ligands and their mutual binding affinities, architectures of nanoparticles with a high degree of symmetry and notable magnetic properties were obtained. The exterior of the nanoassembly presents active surface groups for further functionalization and attachment of modality such as the dual-mode magnetic resonance imaging. The morphology and crystalline nature of the NPs were investigated by transmission electron microscopy and X-ray diffraction analysis, whereas the active nature of the surface attached groups was determined by NMR, Fourier transform infrared, UV-vis, and zeta-potential measurements.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Schuetz, Markus B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ilyas, Shaista UNSPECIFIED UNSPECIFIED UNSPECIFIED Le, Khan UNSPECIFIED UNSPECIFIED UNSPECIFIED Valldor, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED orcid.org/0000-0003-2765-2693 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-329070
DOI:	10.1021/acsanm.0c01097
Journal or Publication Title:	ACS Appl. Nano Mater.
Volume:	3
Number:	6
Page Range:	S. 5936 - 5944
Date:	2020
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	2574-0970
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language GAMMA-FE2O3 NANOPARTICLES; MAGNETIC-PROPERTIES Multiple languages Nanoscience & Nanotechnology; Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/32907