Question

Which of the following techniques is primarily used for the synthesis of carbon nanotubes?

• A. Atomic Layer Deposition (ALD)
• B. Chemical Vapor Deposition (CVD)
• C. Electrospinning
• D. Hydrothermal Synthesis

Hint:

Chemical Vapor Deposition (CVD) is a widely used method for synthesizing carbon nanotubes. It allows precise control over nanotube diameter and structure.
Other techniques like ALD, electrospinning, and hydrothermal synthesis are used for different nanomaterial applications.

Answer 1

The Correct Option is B

Chemical vapor deposition (CVD) is the most widely used technique for the synthesis of carbon nanotubes (CNTs). This method involves the use of a chemical reaction to deposit carbon atoms onto a substrate, where they then form nanotubes.
Step 1: Understand CVD for CNT synthesis
In CVD, gases containing carbon are decomposed at high temperatures, and the carbon atoms then deposit onto the substrate. This technique allows for the controlled synthesis of high-quality carbon nanotubes.
Step 2: Analyze Option A - Atomic Layer Deposition (ALD)
Atomic Layer Deposition is a thin-film deposition technique used for precise layer-by-layer growth. While it can be used for certain nanoscale applications, it is not typically used for CNT synthesis.
Thus, option A is incorrect.
Step 3: Analyze Option B - Chemical Vapor Deposition (CVD)
CVD is the correct method for synthesizing carbon nanotubes. It is the most common technique used in both laboratory and industrial settings to produce high-quality CNTs.
Thus, option B is correct.
Step 4: Analyze Option C - Electrospinning
Electrospinning is used for creating nanofibers, not carbon nanotubes. It involves using an electric field to draw fibers from a polymer solution.
Thus, option C is incorrect.
Step 5: Analyze Option D - Hydrothermal Synthesis
Hydrothermal synthesis is commonly used for the preparation of nanoparticles, but it is not typically used for CNT synthesis.
Thus, option D is incorrect.
Step 6: Conclusion
Chemical Vapor Deposition (CVD) is the primary technique used for the synthesis of carbon nanotubes. Therefore, the correct answer is option B.