Integrated and Segregated Au/γ‐Fe₂O₃ Binary Nanoparticle Assemblies

Abstract

To mix or not to mix: Integrated (left) and segregated (right) assemblies were obtained upon treating functionalized γ‐Fe2O3 nanoparticles (NPs) with AuNPs. Their binary nature is controlled by the capping layer of the γ‐Fe2O3 NPs and the AuNP initial aggregation state. The segregated assembly formation is induced by AuNP aggregates which act as nucleation sites for growth of the γ‐Fe2O3 NP domains.

Localized Template‐Driven Functionalization of Nanoparticles by Dynamic Combinatorial Chemistry

“…When metallic nanoparticles are functionalized with different ligands,t he resulting mixed monolayers can typically be distributed statistically,form domains,orseparate completely, thereby leading to Janus nanoparticles. [8] Although randomly functionalized nanoparticles or nanoparticles functionalized with as ingle ligand have found applications in nanomedicine, [9] imaging, [10] sensing, [11] and as building blocks in controlled self-assembly, [12] the efficient and selective multivalent binding of biomacromolecules requires ac omplementary pattern of small recognition units on the surface of the nanoparticle. [11a, 13] Ap romising approach to obtain ar eceptor complementary to its target is to synthesize it under thermodynamic control in the presence of the target that acts as at emplate.T his approach has been successfully utilized in dynamic combinatorial chemistry (DCC) [14] to make receptors for small molecules, [15] ligands binding to pockets of biomacromolecules, [16] and multivalent polymers.…”

Gold Nanoparticle Assemblies on Surfaces: Reactivity Tuning through Capping‐Layer and Cross‐Linker Design

“…[33][34][35][36] For both cross-linkers L H(NÀO) and L F(NÀO) ,UV/Vis spectroscopic analysiss howedt he formation of AuNP aggregates with optical properties similar to Au TOAB L H and Au TOAB L F (Figure 6). Theu se of this bindingm oietyw ithm etallicp articles is rare.…”

“…Ligands L H , L F ,a nd L H(NÀO) ; [37,38,33] 1,3,5-tri(4-vinylpyridine)benzene (L H3 ); [39] and the solutions of AuNPs capped with citrate [40,41] and TOAB [42] were obtained and characterized as reported. The size and homogeneity of the AuNPs were confirmed by TEM analysis.…”

Superwettability Strategy: 1D Assembly of Binary Nanoparticles as Gas Sensors

“…Nanoparticles (NPs) have attracted intensive research interests from both scientists and engineers, because of their extremely high surface area per mass, unique mechanical, electrical, optical, catalytic as well as magnetic properties . In recent decades, assembling binary/multiple NPs into composites, rather than single‐component counterpart(s), systematically into ordered secondary structures (superlattices/supercrystals) with precisely controlled symmetry and interparticle distance becomes a hot topic, since they can show synergetic effects of the individual components, and even with new collective properties that arise from the interactions between these nanoscale building blocks …”