The study was financially supported by the Knut and Alice Wallenberg Foundation through the Wallenberg Wood Science Center. This is basic research, showing that it's possible, and we hope it will inspire further research that can lead to applications in the future," says Isak Engquist. ![]() "We didn't create the wood transistor with any specific application in mind. But Isak Engquist wants to stress something: Transistors, along with such subsequent developments as integrated circuits, are made of crystalline solid materials called. Shockley of the Bell research staff provided the first of a series of new devices with remarkable potential for expanding the utility of electronic equipment (see photograph). One advantage of the transistor channel being so large is that it could potentially tolerate a higher current than regular organic transistors, which could be important for certain future applications. The invention of the transistor in 1947 by John Bardeen, Walter H. Possible applications could include regulating electronic plants, which is another strong research area at Linköping University. It could also switch the power on and off, albeit with a certain delay - switching it off took about a second on, about five seconds. The researchers used this to build the wood transistor and could show that it is able to regulate electric current and provide continuous function at a selected output level. ![]() These channels were then filled with a conductive plastic, or polymer, called PEDOT:PSS, resulting in an electrically conductive wood material. They removed the lignin, leaving only long cellulose fibres with channels where the lignin had been. The researchers used balsa wood to create their transistor, as the technology involved requires a grainless wood that is evenly structured throughout. The transistor developed by the Linköping researchers, however, can function continuously and regulate electricity flow without deteriorating. And when the ions run out, the transistor stops functioning. In previous trials, transistors made of wood have been able to regulate ion transport only. Yes, the wood transistor is slow and bulky, but it does work, and has huge development potential," says Isak Engquist, senior associate professor at the Laboratory for Organic Electronics at Linköping University. "We've come up with an unprecedented principle. Researchers at Linköping University, together with colleagues from the KTH Royal Institute of Technology, have now developed the world's first electrical transistor made of wood. A transistor regulates the current that passes through it and can also function as a power switch. ![]() Today, they are a crucial component in modern electronic devices, and are manufactured at nanoscale. Transistors, invented almost one hundred years ago, are considered by some to be an invention just as important to humanity as the telephone, the light bulb or the bicycle. The transistor was invented in 1947 by John Bardeen, Walter Brattain and William Shockley at Bell Laboratories in New Jersey.
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