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Watching energy transport through biomimetic nanotubes
Science News from research organizations Watching energy transport through biomimetic nanotubes. Date: October 10, 2019 Source: University of Groningen Summary: Scientists have investigated a simple biomimetic light-harvesting system using advanced spectroscopy combined with a microfluidic platform. The double-walled nanotubes work very efficiently at low light intensities, while they are able to get rid of excess energy at high intensities. These properties are useful in the design of novel materials for the harvesting and transport of photon energy. Share: FULL STORY Scientists from the University of Groningen (the Netherlands) and the University of Würzburg (Germany) have investigated a simple biomimetic light-harvesting system using advanced spectroscopy combined with a microfluidic platform. The double-walled nanotubes work very efficiently at low light intensities, while they are able to get rid of excess energy at high intensities. These properties are useful in the design of novel materials for the harvesting and transport of photon energy. The results were published in the journal Nature Communications on 10 October. advertisement The remarkable ability of natural photosynthetic complexes to efficiently harness sunlight -- even in dark environments -- has sparked widespread interest in deciphering their functionality. Understanding energy transport on the nanoscale is key for a range of potential applications in the field of (opto)electronics. The overwhelming complexity of natural photosynthetic systems, consisting of many hierarchically arranged sub-units, led scientists to turn their attention to biomimetic analogs, which are structured like their natural counterparts but can be more easily controlled. Ligh-harvesting molecules The Optical Condensed Matter Science group and the Theory of Condensed Matter group (both at the Zernike Institute for Advanced Materials, University of Groningen) have joined forces with colleagues from the University of Würzburg (Germany) to gain a comprehensive picture of energy transport in an artificial light-harvesting complex. They used a new spectroscopic lab-on-a-chip approach, which combines advanced time-resolved multidimensional spectroscopy, microfluidics, and extensive theoretical modeling. The scientists investigated an artificial light-harvesting device, inspired by the multi-walled tubular antenna network of photosynthetic bacteria found in nature. The biomimetic device consists of nanotubes made out of light-harvesting molecules, self-assembled into a double-walled nanotube. 'However, even this system is rather complex,' explains Maxim Pshenichnikov, professor of ultrafast spectroscopy at the University of Groningen. His group devised a microfluidic system, in which the outer wall of the tube can be selectively dissolved and, thus, switched off. 'This is not stable, but in the flow system, it can be studied.' In this way, the scientists could study both the inner tube and the complete system. Adapting At low light intensity, the system absorbs photons in both walls, creating excitations or excitons. 'Due to the different sizes of the walls, they absorb photons of different wavelengths,' Pshenichnikov explains. 'This increases the efficiency.' At high light intensity, a large number of photons are absorbed, creating a huge number of excitons. 'We observed that, when two excitons meet, one of them actually ceases to exist.' This effect acts as a kind of safety valve, as high numbers of excitons could damage the nanotubes. Thus, the scientists also demonstrated that the double-walled molecular nanotube is capable of adapting to changing illumination conditions. They mimic the essential functional elements of nature's design toolbox at low light conditions by acting as highly sensitive antennas but get rid of excess energy at high intensities when there is too much light -- a situation that would not normally occur in nature. Both these properties pave the way for better control of the transport of energy through complex molecular materials. make a difference: sponsored opportunity Story Source: Materials provided by University of Groningen. Note: Content may be edited for style and length. Journal Reference: Björn Kriete, Julian Lüttig, Tenzin Kunsel, Pavel Malý, Thomas L. C. Jansen, Jasper Knoester, Tobias Brixner, Maxim S. Pshenichnikov. Interplay between structural hierarchy and exciton diffusion in artificial light harvesting. Nature Communications, 2019; 10 (1) DOI: 10.1038/s41467-019-12345-9 . Cite This Page: MLA. APA. Chicago. University of Groningen. "Watching energy transport through biomimetic nanotubes." ScienceDaily. ScienceDaily, 10 October 2019. . University of Groningen. (2019, October 10). Watching energy transport through biomimetic nanotubes. ScienceDaily. Retrieved October 10, 2019 from www.sciencedaily.com/releases/2019/10/191010113218.htm University of Groningen. "Watching energy transport through biomimetic nanotubes." ScienceDaily. www.sciencedaily.com/releases/2019/10/191010113218.htm (accessed October 10, 2019). RELATED TOPICS Matter & Energy Optics . Physics . Solar Energy . Materials Science . Petroleum . Graphene . Nanotechnology . Energy and Resources . advertisement RELATED TERMS Carbon nanotube . Electric power . Algae . Combustion . Photoelectric effect . Energy . Renewable energy . Electroluminescence . RELATED STORIES How Understanding Photosynthesis Informs Solar Energy, Materials Science, Nanotechnology and Photonics. Nov. 13, 2017 — Scientists explore new methods to capitalize on Nature's light-harvesting secrets. Their new study outlines the design of a synthetic system for energy gathering, conversion and transport that ... read more New Clues Could Help Scientists Harness the Power of Photosynthesis. July 7, 2016 — A discovery has been made that could enable scientists to design better ways to use light energy and to engineer crop plants that more efficiently harness the energy of the sun. The identification of ... read more Researchers Unleash Graphene 'Tiger' for More Efficient Optoelectronics. May 13, 2016 — In traditional light-harvesting methods, energy from one photon only excites one electron or none depending on the absorber's energy gap. The remaining energy is lost as heat. But a new article ... read more Quantum Dots Enhance Light-to-Current Conversion in Layered Semiconductors. Apr. 8, 2016 — Scientists combined the excellent light-harvesting properties of quantum dots with the tunable electrical conductivity of a layered tin disulfide semiconductor to produce a hybrid material that ... read more FROM AROUND THE WEB Below are relevant articles that may interest you. ScienceDaily shares links with scholarly publications in the TrendMD network and earns revenue from third-party advertisers, where indicated.
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