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Hybrid nanomaterial converts light and heat into electricity
By Darren Quick
November 13, 2012
A hybrid nanomaterial synthesized by combining copper sulfide nanoparticles and SWNTs can convert light and heat into electricity (Photo: Shutterstock)
We’ve seen nanomaterials that can be used to convert light into electricity and others that can convert heat into electricity. Now researchers from the
Universityof Texasat Arlingtonand have created a hybrid nanomaterial that can do both. By pairing the material with microchips, the researchers say it could be used in self-powered sensors, low-power electronic devices, and biomedical implants. Louisana Tech University
While single-walled carbon nanotubes (SWNTs) have been used in the construction of transparent solar cells and all-carbon solar cells, these are still very inefficient when compared to their conventional photovoltaic brethren. By supplementing the electricity generated by light with some thermoelectricity, the hybrid nanomaterial could outperform materials that only do one or the other.
“If we can convert both light and heat to electricity, the potential is huge for energy production,” said UT Arlington associate physics professor Wei Chen. “By increasing the number of the micro-devices on a chip, this technology might offer a new and efficient platform to complement or even replace current solar cell technology.”
The new material was synthesized by combining copper sulfide nanoparticles and SWNTs and then used in a prototype thermoelectric generator that the team hopes will eventually be able to produce milliwatts of power.
Compared to SWNT thin-film devices, the researchers say the new thin-film structure increases light absorption by as much as 80 percent in laboratory tests, making it a more efficient generator. Additionally, copper sulfide is much cheaper and more readily available than the noble metals used in similar hybrids.
Lab tests also showed that the optical and thermal switching effect exhibited by the hybrid nanomaterial thin-film devices could be enhanced by up to 10 times by using asymmetric light illumination and thermal radiation rather than symmetric illumination.
About the Author
<clip_image002.jpg>Darren's love of technology started in primary school with a Nintendo Game & Watch Donkey Kong (still functioning) and a Commodore VIC 20 computer (not still functioning). In high school he upgraded to a 286 PC, and he's been following
's law ever since. This love of technology continued through a number of university courses and crappy jobs until 2008, when his interests found a home at Gizmag. All articles by Darren Quick Moore
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