Other Publications (1)
Articles by Martene Imboden in JoVE
Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids Geoffrey Diederich1, Timothy O'Connor1, Pavel Moroz2,3, Erich Kinder1, Elena Kohn2,3, Dimuthu Perera1, Ryan Lorek1, Scott Lambright1, Martene Imboden3, Mikhail Zamkov1,2 1Department of Physics, Bowling Green State University, 2The Center for Photochemical Sciences, Bowling Green State University, 3Department of Chemistry, Bowling Green State University A general strategy for the development of charge-separating semiconductor nanocrystal composites deployable for solar energy production is presented. We show that assembly of donor-acceptor nanocrystal domains in a single nanoparticle geometry gives rise to a photocatalytic function, while bulk-heterojunctions of donor-acceptor nanocrystal films can be used for photovoltaic energy conversion.
Other articles by Martene Imboden on PubMed
The Role of Hole Localization in Sacrificial Hydrogen Production by Semiconductor-metal Heterostructured Nanocrystals Nano Letters. Jul, 2011 | Pubmed ID: 21615085 The effect of hole localization on photocatalytic activity of Pt-tipped semiconductor nanocrystals is investigated. By tuning the energy balance at the semiconductor-ligand interface, we demonstrate that hydrogen production on Pt sites is efficient only when electron-donating molecules are used for stabilizing semiconductor surfaces. These surfactants play an important role in enabling an efficient and stable reduction of water by heterostructured nanocrystals as they fill vacancies in the valence band of the semiconductor domain, preventing its degradation. In particular, we show that the energy of oxidizing holes can be efficiently transferred to a ligand moiety, leaving the semiconductor domain intact. This allows reusing the inorganic portion of the "degraded" nanocrystal-ligand system simply by recharging these nanoparticles with fresh ligands.