Normally an insulator, diamond becomes a metallic conductor when subjected to large strain in a new theoretical model

Normally an insulator, diamond becomes a metallic conductor when subjected to large strain in a new theoretical model
Scanning electron microscope image of a diamond nanoneedle subject to reversible elastic bending deformation. Credit: Amit Banerjee (Kyoto University, Kyoto, Japan), Yang Lu (City University of Hong Kong, Kowloon, Hong Kong), Ming Dao (Massachusetts Institute of Technology, Cambridge, MA), and Subra Suresh (Nanyang Technological University, Singapore, Republic of Singapore)

Long known as the hardest of all natural materials, diamonds are also exceptional thermal conductors and electrical insulators. Now, researchers have discovered a way to tweak tiny needles of diamond in a controlled way to transform their electronic properties, dialing them from insulating, through semiconducting, all the way to highly conductive, or metallic. This can be induced dynamically and reversed at will, with no degradation of the diamond material.


The research, though still at an early proof-of-concept stage, may open up a wide array of potential applications, including new kinds of broadband solar cells, highly efficient LEDs and power electronics, and

Read More
Read More