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STEM

Discovery by LCS’s Sureshkumar may be key to solar energy, smart glass technologies

Monday, August 22, 2011, By News Staff
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College of Engineering and Computer ScienceResearch and Creative

Radhakrishna Sureshkumar, professor and chair of biomedical and chemical engineering in the L.C. Smith College of Engineering and Computer Science, and professor of physics, has developed a patent-pending robust process to manufacture stable suspensions of metal nanoparticles capable of capturing sunlight. By changing the composition of the suspension, researchers can “dial in” to a given wavelength (color) of the spectrum. The American Institute of Physics published Sureshkumar’s research in Applied Physics Letters in July 2011 and his work will be presented at the SPIE Optics + Photonics conference on Aug. 23.

sureshkumarSureshkumar’s research utilized suspensions containing different types or a mixture of metal nanoparticles capable of interacting with different wavelengths of the visible spectrum through a phenomenon referred to as “plasmon resonance.” When nanoparticles are introduced into a solution, their natural tendency is to agglomerate and settle down to the bottom of the solution, hence, such suspensions are inherently unstable. This key challenge was overcome by Sureshkumar and colleagues by employing micelle fragments to act as bridges between nanoparticles, thus holding them in place.

Along with LCS graduate students Tao Cong, Satvik Wani and Peter Paynter, Sureshkumar worked with Brookhaven National Laboratory’s Center for Functional Nanomaterials to characterize the nano-suspensions using small angle x-ray scattering (SAXS) experiments to confirm their ability to create optimal nanoparticle dispersions with tunable optical properties.

“Several applications for this research can be envisioned within the energy field. For instance, the suspensions could be used as precursors to create coatings that improve the light-trapping efficiency of thin film photovoltaic devices. Another application would be in the manufacturing of multifunctional smart glasses for building windows that generate energy from the visible range, while blocking harmful ultraviolet (UV) rays,” says Sureshkumar.

This research was supported by a grant awarded by the National Science Foundation. The team also includes LCS undergraduate students Elia Baszczuk and Georo Zhou, who participate in ongoing research.

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