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(Credit: Chi Hwan Lee/Purdue) Eventually, these stickers could also facilitate wireless communication. The researchers demonstrate capabilities with various objects in a paper in the Proceedings of the National Academy of Sciences . “We could customize a sensor, stick it onto a drone, and send the drone to dangerous areas to detect gas leaks, for example,” says Chi Hwan Lee, assistant professor of biomedical engineering and mechanical engineering at Purdue University. Most of today’s electronic circuits are individually built on their own silicon “wafer,” a flat and rigid substrate. The silicon wafer can then withstand the high temperatures and chemical etching used to remove the circuits from the wafer. Researchers have designed peelable electronic films that can be cut and pasted onto any object to achieve desired functions. (Credit: Chi Hwan Lee/Purdue) High temperatures and etching damage the silicon wafer, however, forcing the manufacturing process to accommodate an entirely new wafer each time. Lee’s new fabrication technique, called “transfer printing,” cuts down manufacturing costs by using a single wafer to build a nearly infinite number of thin films holding electronic circuits. Instead of high temperatures and chemicals, the film can peel off at room temperature with the energy-saving help of simply water. Gas sensors are like tiny electronic rescue dogs “It’s like the red paint on San Francisco’s Golden Gate Bridge—paint peels because the environment is very wet,” Lee says.
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