50 Covers Over 45 Years in the Ozin Group!!

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Articulation and Exploitation of Frustrated Lewis Pairs – A Case of Rediscovery in Science?

Geoff’s latest opinion editorial in Advanced Science News revisits the science of ZnO catalysis in the language of frustrated lewis pairs.

The full article can be read on the Advanced Science News website.

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Size-Tunable Photothermal Germanium Nanocrystals

White light, white heat: A soft-chemistry synthesis of GeO, based on the thermally induced dehydration of Ge(OH)2, enables its thermal disproportionation to give size-controlled germanium nanocrystals (ncGe), which exhibit a pronounced size-dependent photothermal effect, superior to that of silicon nanocrystals (ncSi).

The full article can be read on the Angewandte Chemie website.

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Congrats to Chenxi and Wei!!

Chinese students from Ozin group, Chenxi Qian and Wei Sun (last-year recipient) were awarded highest honor by the Chinese government at the Chinese Consulate General Toronto. Geoff praised his students and gave a speech about his views on Chinese students – how they left him with good impression and how they have changed through the years. Geoff also gave a short speech and expressed his feelings.

The full article can be read on the ChinaDaily website.

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New Hope for Lipophilic Silicon Nanoparticles in Biology

Size separated lipophilic silicon nanoparticles that fluoresce from red to infrared are encapsulated into liposomes and delivered to cells. Specific particles are found to encapsulate better into the liposomes and thus enhance cellular uptake and toxicity when delivered to cancer cells. Congratulations to Chenxi, Kenneth, and Melanie!

The full article can be read on the Nature Scientific Reports website.

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Slow Photons Back in the Fast Lane Break New Ground for All Solar Related Applications in the Future

This review article, published in Advanced Materials provides a comprehensive overview of pioneering research, present day activities and future directions aimed at enhancing the harvesting of sunlight, by exploiting the unique properties of slow photons in photonic crystal materials. The overarching objective is to develop efficient, scalable and cost-effective technologies that improve the efficacy of photocatalysts for making solar fuels from water and carbon dioxide as well as boost the performance of photovoltaics for generating electricity from sunlight. Research of this genre will help enable the transition from non-renewable fossil energy to renewable green energy, a grand challenge in the continuing battle to combat climate change, to protect the environment, to establish a secure and safe energy supply, and provide a sustainable world for humanity.

The full article can be read on the Advanced Materials website.

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Weapons of Mass Construction in the War on Climate Change: Heterogeneous Catalysis and Electro-Catalysis

Geoff’s latest opinion editorial published in Advanced Science News argues the case for using electro-catalysis and heterogeneous catalysis to transform CO2 into fuels.

The full article can be read on the Advanced Science News website.

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A Burning Question: Anthropogenic Methane!

CO2 is generally thought of as the primary contributor to climate change. Recently, however, the significance of CH4 as a greenhouse gas has been growing due to the emissions from shale-gas wells. Geoff’s latest opinion editorial published in Advanced Science News details what we can do about the rapidly increasing concentrations of CH4 and CO2 in our atmosphere.

The full article can be read on the Advanced Science News website.

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Geoff Wins the 2016 World Technology Award in Energy!

Congratulations to Geoff for winning the WTN award in the energy category!

Read more about it on the UofT News website.

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Solar Powered Reverse Water Gas Shift Reaction, CO2 + H2 + hv -> CO + H2O

In this work, published in the November 2016 issue of the Proceedings of the National Academy of Sciences, we investigate the role of oxygen vacancy and hydroxide defects on the electronic and photocatalytic properties of In2O3-x(OH)y nanocrystals that have been shown to effectively reduce CO2 to CO via the solar powered reverse water–gas shift reaction CO2 + H2+ hv CO + H2O.

To understand how such defects, affect photogenerated electrons and holes in these nanomaterials, we used transient absorption spectroscopy to study the relaxation dynamics of these nanocrystalscontaining varying concentration of oxygen vacancy and hydroxide defects.

This analysis showed that higher defect concentrations result in longer excited-state lifetimes, which are attributed to improved charge separation and correlate well with the observed trends in the photocatalytic activity.These results are further supported by density-functional theory calculations, which confirm the positions ofoxygen vacancy and hydroxide defect states within the optical band gap of indium oxide.

This enhanced understanding of the role these defects play in determining the optoelectronic properties and charge carrier dynamics can provide valuable insight toward the rational development of more efficient photocatalytic materials for CO2 reduction.

The full article can be viewed on the PNAS website with a subscription.

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