12-02 :: February/March 2012
nanotimes News in Brief
63
The band gap is a major factor in determining electrical conductivity in a material and directly determines the upper wavelength limit of light ab- sorption. Thus, achieving wide band gap tunability is highly desirable for developing opto-electronic devices and energy materials.
Using a layer-by-layer growth technique for which Ho Nyung Lee of ORNL (US) earned the Presiden- tial Early Career Award for Scientists and Engineers, Lee and colleagues have achieved a 30% reduction in the band gap of complex metal oxides.
variations in surface patterns, it should be possible to improve even further, he says. The enhanced efficiency could also improve the rate of water pro- duction in plants that produce drinking water from seawater, or even in proposed new solar-power systems that rely on maximizing evaporator (solar collector) surface area and minimizing condenser (heat exchanger) surface area to increase the ove- rall efficiency of solar-energy collection. A similar system could improve heat removal in computer chips, which is often based on internal evaporation and recondensation of a heat-transfer liquid through a device called a heat pipe.
Nenad Miljkovic, Ryan Enright, and Evelyn N. Wang: Effect of Droplet Morphology on Growth Dynamics and Heat Transfer during Condensation on Superhydropho- bic Nanostructured Surfaces, In: ACS Nano, Vol. 6(2012), Issue 6, Pages 1776-1785, DOI:10.1021/nn205052a:
http://dx.doi.org/10.1021/nn205052a
http://www.youtube.com/watch?feature=player_ embedded&v=U-aYV0DDuak
ORNL‘s material scientists developed a synthesis strategy for discovering novel complex-oxide thin films for stron- ger solar light absorption. © ORNL
“Our approach to tuning band gaps is based on atomic-scale growth control of complex oxide ma-
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88 |
Page 89