The potential of the acoustic cavitation phenomenon for formation of semiconductor heterojunctions in nanodispersions from initial single semiconducto

这一博士项目致力于将纳米技术、声化学和纳米结构半导体合成领域的最新成果结合在一起，开发用于光驱动制氢的前沿技术。我们打算从最初的单个半导体纳米颗粒出发，探索声空化现象在纳米分散体中形成半导体异质结的可能性。空化微泡的迅速崩塌(10-8 S)导致表面能、液体运动动能转化为热能和化学能，导致这些微泡内部局部产生高温(&gt；3000℃)和压力(&gt；500atm)。由于空化的速度很快，初始的半导体纳米颗粒以超高压缩层的形式排列在空化界面上，受到快速高温加热和随后的冷却。该提议将直接导致新的材料，更重要的是，提供了一种新的广泛适用的简便的光活性半导体异质结的合成方法。在该项目的工作中，候选人将获得复杂的半导体纳米材料和核壳结构的声化学合成、化学和物理方面的知识。还将提供瞬变激光光谱学和光化学方面的额外培训。学生身份还将建立与教授的多学科合作关系。欧洲声化学学会主席、考文垂大学声化学中心主任蒂莫西·梅森说。所培养的知识和技能将为候选人未来在材料和可再生能源领域的学术或工业职业生涯奠定坚实的基础。

This PhD program aspires to bring together recent achievements in the fields ofnanotechnology, sonochemistry and nanostructured semiconductor synthesis to developleading edge technologies for light-driven hydrogen production. We propose to explore thepotential of the acoustic cavitation phenomenon for formation of semiconductorheterojunctions in nanodispersions from initial single semiconductor nanoparticles. The rapid collapse (10-8 s) of the cavitation microbubble results in the conversion of the surface energy, kinetic energy of liquid motion into heat and chemical energy leading to the development of high temperatures (>3000 C) and pressures (>500 atm) locally inside these microbubbles. Due to the high speed of cavitation, the initial semiconductor nanoparticles are ordered at the cavitation interfaces as ultra-highly compressed layer subjected to the rapid high-temperature heating with subsequent cooling. The proposal will lead directly to new materials and, more critically, provide a new widely applicable facile method of the synthesis photoactive semiconductor heterojunctions.During the work on the project, the candidate will acquire knowledge in sonochemicalsynthesis, chemistry and physics of complex semiconductor nanomaterials and core-shellstructures. Additional training will be provided in transient laser spectroscopy andphotochemistry. The studentship will also establish the multidisciplinary collaboration withProf. Timothy Mason, Head of European Sonochemical Society, director of SonochemistryCentre, Coventry University. The knowledge and skills developed will provide the candidate with a solid foundation for his/her future academic or industrial career in materials and renewable energy.