Yujun Shi
Positions
Professor
Contact information
Background
Educational Background
B.Sc Chemistry, Soochow University,
M. Sc Chemistry, Soochow University,
Doctor of Philosophy Chemistry, University of Western Ontario,
Research
Areas of Research
Research interests focus on the understanding of chemical vapour deposition processes at a molecular level using laser analytical and spectroscopic techniques, the application of chemical vapour deposition method for semiconductor nanostructures, and the application of thermal and laser dewetting methods for metal nanoparticle formation. Of particular interest is the investigation of the structures, energetics and dynamics of radicals and intermediates formed in the processes of hot wire chemical vapor deposition (HW-CVD) of semiconductor thin films of SiCx, SiNy, and SiCxNy films using vacuum ultraviolet single-photon ionization / time-of-flight mass spectrometry along with ab initio theoretical calculations. The application of chemical vapour deposition (CVD) method for semiconductor nanostructures is geared toward the metal-nanoparticle-catalyzed CVD growth of one-dimensional semiconductor nanowires, including silicon, gallium oxide, and gallium nitride, using pre-made monodispersed metal nanoparticles with long-range order for a better control of the nanowire growth kinetics and structural properties. Our group has also explored a 'top-down' approach of metal thin film dewetting, including both thermal dewetting and pulse laser-induced dewetting, as a unique surfactant-free metal nanoparticle production method. Efforts are currently being made to obtain a fundamental understanding of the thin film dewetting process for a rational control of the metal nanoparticle formation, and to fully develop the method for the production of metal nanoparticles, spanning from monometallic, to bimetallic, and to multi-metallic high-entropy-alloy nanoparticles.
Courses
| Course number | Course title | Semester |
|---|---|---|
| CHEM 471 | Kinetics and Spectroscopy | Winter 2021, 2022, 2023, 2025 |
| Chem 571 | Physical Chemistry of Interfaces | Fall 2016, Fall 2018, Winter 2022 |
| Chem 599 | Selected Topics in Chemistry: Advanced Mass Spectrometric Techniques | Fall 2024 |
| CHEM 371 | Thermodynamics Chemistry | Winter 2010, Winter 2012 - 2018 |
| CHEM 619 | Selected Topics in Analytical Chemistry - Advanced Mass Spectrometric Techniques | Fall 2011, 2013, 2015, 2019, 2022, 2025 |
Awards
- CNC-IUPAC Travel Award, 2008
- NSERC University Faculty Award, 2004
More Information
Publications
For a complete list of presentations and publications, please visit the IQST site.
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