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Biodegradable transistors -- made from us
Date:3/7/2012

ous combinations of blood, milk, and mucus proteins to any base material, the molecules self-assembled to create a semi-conducting film on a nano-scale. In the case of blood protein, for example, the film is approximately four nanometers high. The current technology in use now is 18 nanometers, says Mentovich.

Together, the three different kinds of proteins create a complete circuit with electronic and optical capabilities, each bringing something unique to the table. Blood protein has the ability to absorb oxygen, Mentovich says, which permits the "doping" of semi-conductors with specific chemicals in order to create specific technological properties. Milk proteins, known for their strength in difficult environments, form the fibers which are the building blocks of the transistors, while the mucosal proteins have the ability to keep red, green and, blue fluorescent dyes separate, together creating the white light emission that is necessary for advanced optics.

Overall, the natural abilities of each protein give the researchers "unique control" over the resulting organic transistor, allowing adjustments for conductivity, memory storage, and fluorescence among other characteristics.

A new era of technology

Technology is now shifting from a silicon era to a carbon era, notes Mentovich, and this new type of transistor could play a big role. Transistors built from these proteins will be ideal for smaller, flexible devices that are made out of plastic rather than silicon, which exists in wafer form that would shatter like glass if bent. The breakthrough could lead to a new range of flexible technologies, such as screens, cell phones and tablets, biosensors, and microprocessor chips.

Just as significant, because the researchers are using natural proteins to build their transistor, the products they create will be biodegradable. It's a far more environmentally friendly technology that addresses the growing problem of
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Contact: George Hunka
ghunka@aftau.org
212-742-9070
American Friends of Tel Aviv University
Source:Eurekalert

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