Chemistry

Research project: Hector: Sol-gel chemistry to nitride materials

Nitride materials are much less well studied than oxides, but have been the focus of heavy interest for several years due to the wealth of technological applications for which they have found to be useful.

Currently Active: Yes

Project Overview

Sol-gel synthesis develops polymeric or particulate structures in solution, then links them into a gel as a means of controlling the shape or internal structure of materials, typically oxides. The technique is poorly developed in non-oxide materials, but developing new routes has the potential to deliver nitride materials in morphologies that cannot otherwise be accessed. We have developed routes based on ammonia or primary amines as the cross-linking agent to control the gelation process and applied these to a number of systems.

We have shown that sol-gel synthesis of nitride materials can lead to the controlled formation of transition metal nitrides as nanostructured materials, aerogels and monolithic objects. We have developed methods to deposit films and inverse opal films of titanium and silicon nitrides by dip coating. We have doped lanthanide elements into silicon nitride to produce high stability phosphors. We can also produce monolithic gels and have used supercritical drying to make silicon nitride aerogels (very low density spongy materials).

Currently we are working to demonstrate the application of porous metal nitride electrodes produced using these methods in energy generation and storage applications, and to expand the range of materials that can be processed in this way.

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Porous structures of silicon imidonitride aerogel 800 m2g-1 and Macroporous titanium nitride inverse opal film produced using non-oxide sol-gel chemistry.

Related research groups

Publications

Publications associated with this project from The University of Southampton's electronic library (e-prints):


Key Publications

Jackson, Andrew W. and Hector, Andrew L. (2007) A nonoxidic sol-gel route to titanium nitride and carbonitride films by primary amine condensation. Journal of Materials Chemistry, 17, (10), 1016-1022. (doi:10.1039/b616067k).
Hassan, Shereen, Hector, Andrew L. and Kalaji, Ali (2011) Sol–gel processing of silicon nitride films from Si(NHMe)4 and ammonia. Journal of Materials Chemistry, 21, (17), 6370-6374. (doi:10.1039/C1JM10127G).
Hassan, Shereen, Hector, Andrew L., Hyde, Jason R., Kalaji, Ali and Smith, David C. (2008) A non-oxide sol–gel route to synthesise silicon imidonitride monolithic gels and high surface area aerogels. Chemical Communications, 42, 5304-5306. (doi:10.1039/b810317h).
Gray, Benjamin M., Hassan, Shereen, Hector, Andrew L., Kalaji, Ali and Mazumder, Baishakhi (2009) Template infiltration routes to ordered macroporous TiN and SiNxFilms. Chemistry of Materials, 21, (18), 4210-4215. (doi:10.1021/cm900753f).
Hassan, Shereen, Carravetta, Marina, Hector, Andrew L. and Stebbings, Laura A. (2009) Nonoxide Sol-Gel Synthesis of Terbium-Doped Silicon Nitride Phosphors. Journal of the American Ceramic Society, 93, (4), 1069-1073. (doi:10.1111/j.1551-2916.2009.03499.x).

Staff

Members of staff associated with this project: