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Effects of Organic Ligands, Electrostatic and Magnetic Interactions in Morphological Control of Inorganic Nanomaterials: a Case of Interfacially-formed Planar Noble Metal and Iron Oxide Nanostructuresстатья Глава в книге
Информация о цитировании статьи получена из
Web of Science
Дата последнего поиска статьи во внешних источниках: 19 сентября 2015 г.
- Авторы: Khomutov G.B., Koksharov Yu A.
- Сборник: Trends in surface science research, Ed. C.P.Norris
- Глава в коллективной монографии
- Год издания: 2006
- Издательство: Nova Science Publishers
- Местоположение издательства: Hauppauge, NY, United States
- Первая страница: 55
- Последняя страница: 96
- Аннотация: This chapter discusses effects of organic ligands, electrostatic and magnetic interactions involved in morphological control of inorganic nanostructures formed by novel interfacial synthesis method. In that method inorganic nanoparticles and nanostructures are fabricated via decomposition of insoluble metal-organic precursor compounds in a layer at the gas/liquid interface with following deposition of grown planar nanostructures on a solid substrate surface. The ultimately thin and anisotropic dynamic monomolecular reaction system was realized by that approach with quasi-two-dimensional growth and organization of inorganic nanoparticles and nanostructures in the plain of Langmuir monolayer. Photochemical and redox reactions were used to initiate processes of interfacial nucleation and growth of inorganic phase. It has been demonstrated that morphology of resulting inorganic nanostructures can be controlled efficiently by variations of growth conditions via changes in state and composition of interfacial planar reaction media with the same precursor, and by variations of composition of adjacent bulk phases. Ultrasmall noble metal (Au and Pd) nanoparticles, nanowires and organized planar disk, ring, net-like, labyrinth and very high surface area branchy nanostructures were obtained by that method using monolayers composed by amphiphilic compounds and water-insoluble precursors. Magnetic iron-containing nanoparticles were photochemically generated by ultraviolet decomposition of a volatile precursor compound iron pentacarbonyl in a mixed Langmuir monolayer. It was demonstrated that the shape of magnetic nanoparticles can be changed from 2D isotropic plate-like and ring-like to the magnetic field-aligned ellipsoidal. The obtained nanostructures were characterized by scanning probe microscopy and transmission electron microscopy techniques. The obtained experimental data show that organic ligand nature along with electrostatic and magnetic interactions are important factors of morphological control of inorganic nanomaterials. Theoretical considerations indicate also to the importance of system dimensionality in relation to the energy balance which determines specific features of structure organization in planar charged metallic and magnetic nanostructures. A requirement of a minimal Coulomb energy, the possibility of free electron redistribution and strengthened attractive interactions between particles in metallic nanostructures can explain a formation of very branchy systems with extremely extended “effective perimeter”. The developed interfacial approach to fabrication of planar inorganic nanostructures can be useful for investigation of fundamental mechanisms of nano-scale structural organization and transformation processes. Also, those methods are relatively simple, ecologically-friendly and thus could prove to be efficient practical instruments of molecular nanotechnology with potential of design and cost-effective fabrication of new controlled-morphology organized planar inorganic and composite nanostructured materials.
- Добавил в систему: Кокшаров Юрий Алексеевич