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Eco-friendly 'pre-fab nanoparticles' could revolutionize nano manufacturing
Date:8/13/2014

AMHERST, Mass. A team of materials chemists, polymer scientists, device physicists and others at the University of Massachusetts Amherst today report a breakthrough technique for controlling molecular assembly of nanoparticles over multiple length scales that should allow faster, cheaper, more ecologically friendly manufacture of organic photovoltaics and other electronic devices. Details are in the current issue of Nano Letters.

Lead investigator, chemist Dhandapani Venkataraman, points out that the new techniques successfully address two major goals for device manufacture: controlling molecular assembly and avoiding toxic solvents like chlorobenzene. "Now we have a rational way of controlling this assembly in a water-based system," he says. "It's a completely new way to look at problems. With this technique we can force it into the exact structure that you want."

Materials chemist Paul Lahti, co-director with Thomas Russell of UMass Amherst's Energy Frontiers Research Center (EFRC) supported by the U.S. Department of Energy, says, "One of the big implications of this work is that it goes well beyond organic photovoltaics or solar cells, where this advance is being applied right now. Looking at the bigger picture, this technique offers a very promising, flexible and ecologically friendly new approach to assembling materials to make device structures."

Lahti likens the UMass Amherst team's advance in materials science to the kind of benefits the construction industry saw with prefabricated building units. "This strategy is right along that general philosophical line," he says. "Our group discovered a way to use sphere packing to get all sorts of materials to behave themselves in a water solution before they are sprayed onto surfaces in thin layers and assembled into a module. We are pre-assembling some basic building blocks with a few predictable characteristics, which are then available to build your complex device."


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Contact: Janet Lathrop
jlathrop@admin.umass.edu
413-545-0444
University of Massachusetts at Amherst
Source:Eurekalert  

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