Q14.
Graphene is frequently in news recently. What is its importance? 1. It is a two-dimensional material and has good electrical conductivity. 2. It is one of the thinnest but strongest materials tested so far. 3. It is entirely made of silicon and has high optical transparency. 4. It can be used as 'conducting electrodes' required for touch screens, LCDs and organic LEDs. Which of the statements given above are correct?
Answer
C
Explanation
Graphene is a two-dimensional allotrope of carbon (NOT silicon — statement 3 is wrong). It is the thinnest yet strongest material tested so far. It has excellent electrical conductivity. Research institutes worldwide are already looking at ways to build better touch-screens, ultrafast transistors and photo-detectors using graphene. It can be used as conducting electrodes for touch screens, LCDs and organic LEDs. It won the Nobel Prize in 2010 for its discoverers.