Abstract
The ability to control the assembly of nanoparticle building blocks is critically important for the development of new materials and devices. The properties and functions of nanomaterials are not only dependent on the size and properties of individual particles, but also the interparticle distance and interactions. In order to control the structures of nanoassemblies, it is important to first achieve a precise control on the chemical functionality of nanoparticle building blocks. This review discusses three methods that have been reported recently for the preparation of monofunctional gold nanoparticles, i.e., nanoparticles with a single chemical functional group attached to each particle. The advantages and disadvantages of the three methods are discussed and compared. With a single functional group attached to the surface, one can treat such nanoparticles as molecular building blocks to react with other molecules or nanoparticles. In other words, by using appropriate chemical reactions, nanoparticles can be linked together into nanoassemblies and materials by covalent bonds, similar to the total chemical synthesis of complicated organic compounds from smaller molecular units. An example of using this approach for the synthesis of nanoparticle/polymer hybrid materials with optical limiting properties is presented. Other potential applications and advantages of covalent bond-based nanoarchitectures vs. non-covalent interaction-based supramolecular self-assemblies are also discussed briefly in this review.
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Acknowledgements
This work was financially supported by the National Science Foundation CAREER Award DMR 0239424 and 0552295, and Nanoscale Interdisciplinary Research Team award DMI 0506531.
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Huo, Q., Worden, J.G. Monofunctional gold nanoparticles: synthesis and applications. J Nanopart Res 9, 1013–1025 (2007). https://doi.org/10.1007/s11051-006-9170-x
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DOI: https://doi.org/10.1007/s11051-006-9170-x