Binary small molecule organic nanoparticles exhibit both direct and diffusion-limited ultrafast charge transfer with NIR excitation
| Autor: | Victoria E. Lee, Hoang (Jack) Lu, Leon Z. Wang, Margherita Maiuri, Gregory D. Scholes, Robert K. Prud'homme, Tristan L. Lim, Bryan Kudisch |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Small molecule Polymer solar cell Dissociation (chemistry) 0104 chemical sciences chemistry.chemical_compound chemistry Diimide Chemical physics Amphiphile Molecule General Materials Science 0210 nano-technology Excitation |
| Zdroj: | Nanoscale. 11:2385-2392 |
| ISSN: | 2040-3372 2040-3364 |
| DOI: | 10.1039/c8nr09619h |
| Popis: | Here we describe a facile, one-step synthesis of a binary organic nanoparticle composed completely of NIR-absorbing small molecules, a quatterylene diimide and a vanadyl napthalocyanine, using Flash Nanoprecipitation. We show that the molecules are co-encapsulated within an amphiphilic block copolymer shell by observing distinct ultrafast dynamics in the binary nanoparticles compared to nanoparticles of their individual components, which we rationalize as a photoinduced charge transfer. We then draw similarities between the charge transfer dynamics studied in our system and the charge dissociation process in macroscale organic bulk heterojunction blends for OPV applications by assigning the ultrafast time component (∼10 ps) to direct interfacial charge transfer and the slow component (70-200 ps) to diffusion limited charge transfer. This discovery can inspire the development of mixed-composition nanoparticles with new functionality for optoelectronic and theranostic applications. |
| Databáze: | OpenAIRE |
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