BEGIN:VCALENDAR VERSION:2.0 PRODID:-//132.216.98.100//NONSGML kigkonsult.se iCalcreator 2.20.4// BEGIN:VEVENT UID:20250901T100623EDT-8931WBDKcU@132.216.98.100 DTSTAMP:20250901T140623Z DESCRIPTION:Abstract:\n\nPolymeric photocatalysts made of Earth-abundant el ements have been extensively developed over the past decade to take advant age of their synthetic tunability.1 Within this family\, carbon nitrides ( CNx) are emerging as leading photocatalysts because of their high photocat alytic performance combined with good stability and facile synthesis.2 How ever\, significant gaps remain in our knowledge of the photophysical prope rties of these organic polymeric materials. Determining the pathways and m echanism of photoinduced processes will greatly aid our efforts to enginee r better CNx photocatalysts for solar fuel production\, environmental reme diation\, and synthetic photochemistry.3\n\nWe have developed a first-of-i ts-kind transient absorption microscopy (TAM) system that can monitor char ge carrier dynamics on the microsecond – second timescales together with s patial resolution on the micron scale. Spatial mapping of the charge carri er dynamics with this system provides novel insights into the particle-to- particle heterogeneity and heterogeneity within individual CNx particles. Our observations point to the presence of at least two different types of trap states that dictate the density of trapped charges and the charge car rier lifetime\, respectively.\n\nPhotocatalysts are often surface-modified with cocatalysts to enhance their photocatalytic activity and drive speci fic chemical transformations. We use transient absorption spectroscopy (TA S) on these types of systems where CNx have been modified by cocatalysts c ontaining metals such as Pt\, Ni\, and Co.4 We can observe the impact of t hese surface modifications on the charge carrier dynamics and glean inform ation on charge transfer pathways and reaction mechanisms. These new insig hts into the charge carrier dynamics of CNx can push the field of photocat alyst into uncovering the optimal structure and local environment in defec t-rich organic semiconductors such as CNx.\n\n1 Y. Wang\, A. Vogel\, M. Sa chs\, R. S. Sprick\, L. Wilbraham\, S. J. A. Moniz\, R. Godin\, M. A. Zwij nenburg\, J. R. Durrant\, A. I. Cooper and J. Tang\, Nat. Energy\, 2019\, 4\, 746–760.\n\n2 P. O. Ohemeng and R. Godin\, Sustainable Energy Fuels\, 2023\, 7\, 3250–3265.\n\n3 R. Godin and J. R. Durrant\, Chem. Soc. Rev.\, 2021\, 50\, 13372–13409.\n\n4 C. Liu\, J. Liu and R. Godin\, ACS Catal.\, 2023\, 13\, 573–586.\n\n \n\nBio:\n\nDr. Robert Godin established the Sola rSpec group (Solar Energy Conversion and Spectroscopy) in 2018 at UBC Okan agan in Kelowna\, British Columbia\, Canada. The group develops time-resol ved spectroscopic tools to better understand carbon-based semiconductors f or sustainable energy production\, with a healthy dose of physical organic chemistry concepts. Born in Bathurst\, New Brunswick\, Robert has fostere d an interest in photochemistry since the start of his higher education ca reer. He first got introduced to photochemistry and spectroscopy technique s working with Prof. Tito Scaiano during his B.Sc. at the University of Ot tawa. He continued to learn advanced optical techniques with Prof. Gonzalo Cosa during his Ph.D. on single molecule spectroscopy at 91ºÚÁÏÍø Universit y. Robert then completed a FRQNT-funded postdoctoral stint from 2015 to 20 18 with Prof. James Durrant at Imperial College London\, UK\, to fully ent er the field of solar energy conversion.\n DTSTART:20240924T170000Z DTEND:20240924T183000Z LOCATION:OM 10\, Maass Chemistry Building\, CA\, QC\, Montreal\, H3A 0B8\, 801 rue Sherbrooke Ouest SUMMARY:Chemical Society Seminar: Robert Godin- Deciphering Charge Carrier Dynamics in Carbon Nitride Photocatalysts for Improved Energy\, Environmen tal\, and Synthetic Applications URL:/chemistry/channels/event/chemical-society-seminar -robert-godin-deciphering-charge-carrier-dynamics-carbon-nitride-358380 END:VEVENT END:VCALENDAR