Washington: An international team of scientists, from the State University of Pennsylvania (USA) and the Universidad Autonoma de Madrid (UAM), has developed a technique to replicate biological structures, such as butterfly wings, on a nano scale.
The resulting biomaterial could be used to make optically active structures, such as optical diffusers for solar panels.
Insects’ colours and their ability to change colours depending on the angle or their ability to appear metallic are determined by tiny nano-sized photonic structures, which can be found in their cuticle. Scientists have focused on these biostructures to develop devices with light emitting properties.
“This technique was developed at the Materials Research Institute of the State University of Pennsylvania and it enables replicas of biological structures to be made on a nanometric scale”, said Raul J. Martín-Palma, lecturer at the Department of Applied Physics of the UAM.
The researchers have created “free-standing replicas of fragile, laminar, chitinous biotemplates”, that is, copies of the nano structures of butterfly wings. The appearance of these appendices usually depends more on their periodical nanometric structure (which determines the “physical” colour) than on the pigments in the wings (which establish the “chemical” colour).
In order to create new biomaterial, the team used compounds based on Germanium, Selenium and Stibium (GeSeSb) and employed a technique called Conformal-Evaporated-Film-by-Rotation (CEFR), which combines thermal evaporation and substrate rotation in a low pressure chamber.
They also used immersion in an aqueous orthophosphoric acid solution to dissolve the chitin (substance typically found in the exoskeleton of insects and other arthropods).
The methods used to date to replicate bio structures are very limited when it comes to obtaining effective copies on a nanometric scale and they often damage the original biostructure because they are used in corrosive atmospheres or at high temperatures.
The new technique “totally” overcomes these problems, as it is employed at room temperature and does not require the use of toxic substances.
According to Martin-Palma, the structures resulting from replicating the biotemplate of butterfly wings could be used to make various optically active structures, such as optical diffusers or coverings that maximise solar cell light absorption, or other types of devices.
“Furthermore, the technique can be used to replicate other biological structures, such as beetle shells or the compound eyes of flies, bees and wasps,” the researcher said.
First Published: Friday, October 09, 2009, 15:13