Network nanoparticle-induced

Peng et al. [150] prepared AgAu nanoalloys via three different procedures by using laser-induced heating (i) mixture of Au nanoparticles and Ag(I) ions irradiated by a 532 nm laser, (ii) mixture of Au and Ag nanoparticles irradiated by a 532 nm laser, and (iii) mixture of Au and Ag nanoparticles irradiated by a 355 nm laser. In procedures (ii), nanoalloys with a sintered structure were obtained. The morphology of the obtained nanoalloys depended not only on the laser wavelength but also on the concentration of nanoparticles in the initial mixture. Large-scale interlinked networks were observed upon laser irradiation when the total concentration of Ag and Au nanoparticles in the mixture increased. 

Matsuda K, Yamaguchi H, Sakano T, Ikeda M, Tanifuji N, Irie M (2008) Conductance photoswitching of diarylethene gold nanoparticle network induced by photochromic reaction. J Phys Chem C 112(43) 17005-17010... 

A magnetic field, when applied perpendicularly to the substrate, induces the formation of 2-D hexagonal superlattices of individual Co nanoparticles [30] Pileni et al. [28] observed the formation of a hexagonal network of about 1 [tm dot-shaped aggregates made from 8nm cobalt nanopartides. CoPts nanociystals (4nm), when deposited under a magnetic field of 0.9 Tapplied perpendicularly to the substrate, can... 

Fig. 6.14 (A)[54] TEM images of (a) y-CD-capped gold nanopaiticles tind (b) Cgo-induced aggregation. (c) Schematic illustration of the structure of fullerene-induced network of y-CD-capped gold nanoparticles in aqueous dispersion. (B)[75] (a) Schematic illustration of the mediation-template strategy for quatemeiry ammonium-stabilized gold nanopaiticles and a mediettor (2) (b-d) TEM images of the 2-mediated nanoparticle assemblies prepared by various conditions...

These phenomena, together with the enhanced affinity toward the substrate (the association constant increases of almost four orders of magnitude in the NPs), induced by the self-organized network on the surface of the nanoparticles, lead to a great increase in the sensitivity of the system, and provide interesting hints for the development of new fluorescent chemosensors. The same TSQ derivative was included in the silica matrix by Mancin and coworkers [25] that reported how its fluorescence was still sensitive to the presence of zinc ions but no amphfication effect could be observed, as we will discuss more in detail in Sect. 3.1.2. 

The aggregation of CP[5]A(g)QDs to a supramoleeular network can be induced by addition of bridged bis(MV)s. Host-guest interaetions of CP[5]As and bridged bis(MV)s are the driving force for fabrieation of the 3D network strueture of this hybrid material, and bridged bis(MV)s will act as a bridge to link CP[5]A-stabilized QD nanoparticles. 

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