Iijima found that the solids consisted of tiny tubes made up of numerous concentric “graphene” cylinders, each cylinder wall consisting of a sheet of carbon atoms arranged in hexagonal rings. In 1991 Iijima Sumio of NEC Corporation’s Fundamental Research Laboratory, Tsukuba Science City, Japan, investigated material extracted from solids that grew on the tips of carbon electrodes after being discharged under C 60 formation conditions. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today. Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.14) Hydrogen storage using CNTs is expected to be used in the development of a fuel cell. In this case, the enclosed squarylium dye absorbs light and then an energy transfer (sensitization) to the outer CNT occurs. squarylium) can be easily enclosed within the internal space of CNTs in solution. Properties of the enclosed water in the CNT are different from those of bulk water. 11) In addition, CNTs can enclose metal, water, and molecular oxygen. For instance, there is a fullerene-enclosed CNT, the so-called ‘peapod’. 8-10)ĬNTs can enclose nanoscale molecules and atoms in the internal space, because of the cylindrical structure. On the basis of such excellent characteristics, CNTs are expected to be field-effect transistor (FET) materials, nanoscale wire materials, electron emission sources, optical communication switches, chemical sensors, high strength composites, and thermal devices. Moreover, CNTs have high physical durability, high electrical and thermal conductivity, and are light and flexible. Since we need to obtain the semiconducting CNT in pure form in order to utilize the semiconductivity, improved synthetic procedure and efficient purification of CNT are further required. 2,3) A normal synthetic procedure gives a mixture of semiconducting CNTs in 2/3 and metallic CNTs in 1/3, because rolling a carbon sheet occurs randomly. The variety of these structures provides various band structures and metallic and semiconducting properties. There are diverse CNTs on the basis of their length, diameter of the nanotube, state of chirality, and number of the layer. 1) A CNT consists of only sp2 carbons similar to fullerenes. A carbon nanotube (CNT) has a cylindrical structure with a nanoscale diameter that is like a rolled graphene sheet.
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