Nanoparticles as Building Blocks

Solution phase chemical synthesis is a convenient way for making surfactant coated magnetic nanoparticles, as described in various reviews [12-18]. Monodisperse Co nanoparticles with standard deviation less than 10% are synthesized by decomposition of Co2(CO)8 [19-22] or Co(rj3-C8Hi3X n4-C8Hi2) [23] and reduction of cobalt salt [24,25] in the presence of oleic acid and trialkylphosphine, or trialkylphosphine oxide, or alkylamine. Monodisperse iron nanoparticles are normally prepared from decomposition of Fe(CO)5 [26-28]. However, metallic iron-based particles from this decomposition procedure are difficult to characterize due to the chemical instability. A recent synthesis using decomposition of Fe[NSiMe3)2]2 offers a promising approach to monodisperse Fe nanocrystals [29]. 

Different from the metallic nanoparticles, iron-oxide nanoparticles are chemically much more stable and readily synthesized. They can be prepared via high-temperature organic-phase decomposition of FeCup3, where Cup represents N-nitrosophenylhydroxylamine, C6H5N(N0)0 [30], decomposition ofFe(CO)s followed by oxidation [31-33], and decomposition of iron carboxylate [34, 35]. They can also be synthesized from partial reduce-tion/decomposition of Fe(acac)3 or Fe(acac)3 and M(acac)2 [36-38]. 

Using similar decomposition/reduction chemistry, multi-component magnetic nanoparticles have been prepared. Specifically, monodisperse FePt 

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Zeolite nanocrystals have been demonstrated to be versatile building blocks for constructing hierarchical porous structures. " The use of nanoparticles as building blocks allows mild processing conditions... 

For an essential decrease in tunnel junction size and corresponding increase in operating temperature, more sophisticated technologies are required for the fabrication of SE structures. Meanwhile, advances in lithographic methods have opened the way to much smaller structures. Nevertheless, with the decreasing size the technical effort is increased drastically. Thus, an alternative route would be to use hgand-stabilized metal nanoparticles as building blocks. 

Ibanez, M., Zamani, R., Gorsse, S., Pan, J. D., Ortega, S., Cadavid, D., et ah (2013). Coreshell nanoparticles as building blocks for the bottom-up production of functional nanocomposites PbTe-PbS thermoelectric properties. ACS Nano, 7, 2573-2588. 

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