By Gege Li
Diamond, one of the hardest known materials, could have a rival. A new form of carbon that is just as hard as the gemstone but as light as pencil graphite could theoretically be used for applications including gas storage and optoelectronics.
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Carbon exists in different natural forms, called allotropes, depending on how its atoms bond with each other. Among the most well-known carbon allotropes are diamond and graphite, the substance used for pencils, although many more types can be made …