Abstract
Hybrid nanoparticles of gold and silver can not only retain the beneficial features of both nanomaterials, but also possess unique advantages (synergism) over the other two types. Novel pseudospherical and anisotropic nanoparticles, bimetallic triangular nanoparticles, and core@shell nanoparticles were prepared by the different procedures for various applications and understanding both the particle evolution (nucleation) and nanoparticle anisotropy. Hybrid nanoparticles of gold and silver are considered to be low in toxicity, and exhibit facile surface functionalization chemistry. Furthermore, their absorption peaks are located in visible and near-infrared region. These nanoparticles provide significant plasmon tunability, chemical and surface modification properties, and significant advances in the growth into anisotropic nanostructures. The photoinduced synthesis can be used to prepare various (sub) nanoparticles and OD and 1D nanoparticles. Ostwald and digestive ripening provided narrower particle size distribution.
Highlights
The noble metal nanoparticle colloids were reported to exhibit a wide range of various applications from different fluids to in vitro and vivo as a carrier for drug delivery into cells and tissues to optical and magnetic manipulations in biomedical systems as well (Sun et al, 2000)
Novel pseudospherical and anisotropic nanoparticles, bimetallic triangular nanoparticles, and core@shell nanoparticles were prepared by the different procedures for various applications and understanding both the particle evolution and nanoparticle anisotropy
Hybrid nanoparticles of gold and silver are considered to be low in toxicity, and exhibit facile surface functionalization chemistry
Summary
The noble metal nanoparticle colloids were reported to exhibit a wide range of various applications from different fluids to in vitro and vivo as a carrier for drug delivery into cells and tissues to optical and magnetic manipulations in biomedical systems as well (Sun et al, 2000). The composite nanoparticles with the iron atoms domains generate the magnetism and with the gold atoms exhibit the unique optical features. Such nanoparticles exhibit unique properties which mostly strongly differ from the bulk or classical materials. Organic compounds with polar groups (Boal et al, 2000), thioacetate groups (Brousseau et al, 1999), amino- and carboxylate groups and tetradentate thioether ligands (Maye et al, 2002) have recently been used to mediate the formation of 0D or 1D nanoparticles In this second part of the review (Preparation II) we summarize and discuss the preparation hybrid, functional and bimetallic noble metal nanoparticles including their particle nucleation, ripening and optical properties
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