Structure-Property Relationships of Nanoparticle Clusters

? Structure-Property Relationships of Nanoparticle Clusters

The ability to shape matter on the nanoscale, i.e. in the size regime between the molecular and the microscopic levels is a major technological challenge of this century. A possible way to accomplish this goal is to assemble such structures from chemically modified inorganic particles. These particles can, depending on the functional groups on their surfaces, undergo specific linkage reactions to from complex particle aggregates, whose structures are determined by the selective chemical interactions between the particles and by their relative sizes. This self-assembly process can lead to discrete superstructures of infinite variety and with function.

Nanopartilce Synthesis

Research in the group is devoted to developing selective methods for the linkage of inorganic nanoparticles into larger aggregates and to investigating the bonding and physical properties of the resulting structures. Examples for nanoparticle-based structures with zero-, one- and two-dimensional geometries are shown below. These nanoparticle clusters are supported by covalent or electrostatic interactions between the nanoparticles. They form by reaction of inorganic nanoparticles functionalized with organic linkers their surfaces. By adjusting the nanoparticle surface chemistries and the particle stoichiometry, it is possible to control the structures and bonding in these clusters.

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	»	Planar Gold Nanoparticle Clusters as Microscale Mirrors, Jin Y. Kim, Frank E. Osterloh, J. Am. Chem. Soc., 2006, 128(12), 3868 - 3869. DOI: 10.1021/ja057958k

	»	Directional Superparamagnetism and Photoluminescence in Clusters of Magnetite and CdSe Nanoparticles, Frank E. Osterloh, Comm. Inorg. Chem., 2006, 27(1-2), 41-59. DOI: 10.1080/02603590500538654

	»	A Nanowire-Nanoparticle Crosslinking Approach to Highly Porous Electrically Conducting Solids, Nick Akl, Olga Trofymluk, Xiubin Qi, Jin Y. Kim, Frank E. Osterloh, Alexandra Navrotsky, Angew. Chem., Int. Ed. Engl., 2006, 45(22), 3653-3656. DOI: 110.1002/anie.200503950

	»	Planar Polarized Light Emission From CdSe Nanoparticle Clusters, Jin Young Kim, Hiroki Hiramatsu, Frank E. Osterloh, J. Am. Chem. Soc., 2005, 127(44), 15556-15561. DOI: 10.1021/ja0541377

	»	Fe₃O₄-LiMo₃Se₃ Nanoparticle Clusters as Superparamagnetic Nanocompasses, Frank E. Osterloh, Hiroki Hiramatsu, R. K. Dumas, Kai Liu, Langmuir, 2005, 21(21), 9709-9713. DOI: 10.1021/la051498r

	»	Chemical Sensing with LiMo₃Se₃ Nanowire Films, Xiubin Qi, Frank E. Osterloh, J. Am. Chem. Soc., 2005, 127(21); 7666-7667.DOI: 10.1021/ja050960r

	»	ZnO-CdSe Nanoparticle Clusters as Directional Photoemitters with Tunable Wavelength, Jin Young Kim, Frank E. Osterloh, J. Am. Chem. Soc, 2005, 127 (29), 10152-10153. DOI: 10.1021/ja052735f

	»	Synthesis and Real-Time Magnetic Manipulation of a Biaxial Superparamagnetic Colloid, Jin Young Kim, Frank E. Osterloh, Hiroki Hiramatsu, R. K. Dumas, Kai Liu, J. Phys. Chem. B, 2005, 109 (22), 11151-11157. DOI: 10.1021/jp050348m

	»	Alkanethiol-Induced Structural Rearrangements in Silica-Gold Core-Shell Type Nanoparticle Clusters - An Opportunity for Chemical Sensor Engineering, Frank E. Osterloh, Hiroki Hiramatsu, Rhiannon Porter, and Ting Guo, Langmuir, 2004, 20, 5553-5558. DOI: 10.1021/la0348719

	»	pH Controlled Assembly and Disassembly of Electrostatically Linked CdSe-SiO₂ and Au-SiO₂ Nanoparticle Clusters, Hiroki Hiramatsu and Frank E. Osterloh, Langmuir 2003, 19(17), 7003-7011. DOI: 10.1021/la034217t

	»	Stringing up the Pearls: Self-Assembly, Optical and Electronic Properties of CdSe- and Au-LiMo₃Se₃ Nanoparticle-Nanowire Composites, Frank E. Osterloh, Jason S. Martino, Hiroki Hiramatsu, and Daniel P. Hewitt Nano Letters, 2003, 3(2), 125-129. DOI: 10.1021/nl025739g

	»	Solution Self-Assembly of Magnetic Light Modulators from Exfoliated Perovskite and Magnetite Nanoparticles, Osterloh, F. J. Am. Chem. Soc.; 2002; 124(22); 6248-6249. DOI: 10.1021/ja025858y

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.	The Osterloh Research Group is part of the University of California, Davis Department of Chemistry.

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