Q.

Which of the following is an example of bottom-up approach for the preparation of nanomaterials?

A. etching
B. dip pen nano-lithography
C. lithography
D. erosion
Answer» B. dip pen nano-lithography
Explanation: dip pen nanolithography is an example of bottom-down approach for the preparation of nanomaterials. all the other options are the example of top-down approach.
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