Selective assembly of Au-Fe3O4 nanoparticle hetero-dimers

Abstract

Hetero-dimeric magnetic nanoparticles of the type Au-Fe3O4 have been synthesised from separately prepared, differently shaped (spheres and cubes), monodisperse nanoparticles. This synthesis was achieved by the following steps: (a) Mono-functionalising each type of nanoparticles with aldehyde functional groups through a solid support approach, where nanoparticle decorated silica nanoparticles were fabricated as an intermediate step; (b) Derivatising the functional faces with complementary functionalities (e.g. amines and carboxylic acids); (c) Dimerising the two types of particles via amide bond formation. The resulting hetero-dimers were characterised by high-resolution TEM, Fourier transform IR spectroscopy and other appropriate methods.Graphical AbstractNano-LEGO: Assembling two types of separately prepared nanoparticles into a hetero-dimer is the first step towards complex nano-architectures. This study shows a solid support approach to combine a gold and a magnetite nanocrystal.Electronic supplementary materialThe online version of this article (doi:10.1007/s00604-015-1571-z) contains supplementary material, which is available to authorized users.

Magnetic Nanoparticle Composites: Synergistic Effects and Applications

“…After proper functionalization of both parts, amine bond formation was used to dimerize the two particle types. [183] Pariti et al produced Au-Fe 3 O 4 bifunctional nanocomposites through a single step hot-injection precipitation method. Iron pentacarbonyl was used as Fe precursor, while chloroauric acid was the Au source.…”

Magnetic-Plasmonic Heterodimer Nanoparticles: Designing Contemporarily Features for Emerging Biomedical Diagnosis and Treatments

“…For instance, Giang et al synthesized Fe-Au hybrids in a porous Fe 3 O 4 mosaic coating with tunable magnetization and surface plasmon absorption [81]. Additionally, a wide range of biomolecules and polymers could be performed as a matrix of magnetic-plasmonic structures, which were frequently investigated in reviews of polymeric coatings [157,158]. These structures are commonly used as nanocarriers for drug delivery [95,159].…”

Constructing a library of metal and metal–oxide nanoparticle heterodimers through colloidal assembly

“…Chen et al 44 assembled Au and TiO 2 NPs with the help of a Langmuir Blodgett trough to create Janus particles. Other approaches used for heterodimer assembly include the use of nanoscopic phase separation of different metals to form dimers, 45 the use of coordination chemistry to link nanoparticles through various molecules, [46][47][48] the use of solid supports during synthesis, 49 and the use of electron beam lithography 50 but many of these methods are designed for specific combinations of NPs or require significant experimental steps or costs. 51 There is not yet a general approach to the formation of heterodimers, like the methods mentioned above for the formation of homodimers, especially for dimers with the small gaps necessary for broader application purposes.…”