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Nanoprecise Self-Assembly Of Electro-Optic And Electroluminescent Molecular Arrays

Qinglan Huang, Hu Kang, J. Veinot, H. Yan, Peiwang Zhu, T. Marks
Published 2003 · Materials Science

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Although the current state of molecular synthesis has reached an impressive level of sophistication in the past decades, the ability of scientists to organize array of engineered molecular building blocks to achieve certain specific materials functions is currently in its infancy. Of particular attraction would be pathways which led via spontaneous self-organization processes to robust arrays of molecules with designed electronic and/or opto-electronic characteristics and spatial relationships. Ideally, the structural control of the assembly process would be at the sub-nm level and the structures would “click” into place after initial self-assembly. In the present contribution, we briefly discuss two complementary efforts to achieve such capabilities. In one effort, we focus on self-assembly routes to fabricate nanoscopically acentric arrays of high-hyperpolarizability building blocks for electro-optic function and in the other on the nanoscopic interfacial phenomena that tune charge injection and radiative recombination efficiencies in electroluminescent molecule-based organic heterostructures. Each approach makes use of well-characterized siloxane condensation chemistry, which can be used in successions of self-limiting chemisorptive processes, to deposit conformai, adherent, and virtually pin hole-free layers of molecular entities with sub-nm precision. An important consideration here is to apply a battery of physical characterization techniques to precisely define nanostructure and to correlate this with photonic response.
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