Graphene Properties and Forms Explained

This question assesses the understanding of graphene's electrical conductivity and its potential structural forms.

Analyzing Statement I: Graphene Conductivity

Statement I claims that graphene, in its purest and defect-free form, has electrical conductivity *lesser* than that of Gold and Copper.

• Graphene's Conductivity: Graphene is a single layer of carbon atoms arranged in a hexagonal lattice. It is renowned for its exceptional electrical properties.
• Comparison: Studies and experimental results consistently show that graphene possesses significantly higher electrical conductivity than both copper and gold at room temperature. Its unique electronic band structure allows for very efficient charge carrier mobility.
• Conclusion: Therefore, the claim that graphene's conductivity is lesser than gold and copper is incorrect. Statement I is wrong.

Analyzing Statement II: Graphene Structures

Statement II claims that it is possible to develop graphene in the form of nano-ribbons and quantum dots.

• Graphene Nanostructures: Advanced fabrication techniques allow scientists to precisely pattern graphene into various forms.
• Nano-ribbons: Graphene can be cut or grown into narrow strips known as graphene nano-ribbons. The width and edge structure of these ribbons significantly influence their electronic and magnetic properties, making them promising for nanoelectronic devices.
• Quantum Dots: Graphene can also be processed into quantum dots (GQD), which are tiny fragments exhibiting quantum mechanical properties. These GQDs have applications in areas like bio-imaging, sensors, and optoelectronics.
• Conclusion: It is indeed possible to create graphene nano-ribbons and quantum dots. Statement II is correct.

Final Conclusion

Based on the analysis of both statements:

• Statement I is incorrect because graphene's conductivity surpasses that of gold and copper.
• Statement II is correct as graphene can be engineered into nano-ribbons and quantum dots.

Therefore, the correct option is the one stating that Statement II is correct and Statement I is wrong.