M.Sc. (Semester (CBCS) Examination Nov/Dec-2018
Nano-Technology
NANO-MATERIALS FABRICATION
Time: 2½ Hours Max. Marks: 70
Instructions: All questions are compulsory.
Figures to the right indicate full marks.
Draw neat diagrams.
Q.1 Rewrite the sentences by choosing correct answer from given alternatives: 14
The simplest application of laser ablation is to remove material from a
Gases and liquids Gases
Liquid surface Solid surface
Pulsed lasers can drill extremely deep holes through very hard materials.
Small Big
Very big Unequal
Arc discharge was the first recognized technique for producing
Graphene Graphite
MWNTs Simple CNT
The objective of milling is to reduce the
Particle size Energy
Physically Chemically
The size of the nanoparticles is
200 to 300 nm 1 to 100 nm
600 to 700 nm 300 to 400 nm
The different type of ball milling can be used for
Synthesis of normal material Synthesis of plant
Synthesis of Nanomaterials None of these
The CVD is often used in the semiconductor industry to produce
Magnetic flux Capacitor
Transistor Thin film
Direct liquid injection (DLICVD) in which the precursors are in
Solid form Liquid form
Gas form Gas/liquid form
CVD is extremely useful in the process of deposition.
Non-layer Molecular layer
bulk layer atomic layer
10) Nan textured surfaces have on the nanoscale.
One dimension Three dimension
Four dimension Five dimension
11) Nucleation is usually a process.
Particular Specific
Linear Stochastic
Page 2 of 2
SLR-VT-526
12) Spray pyrolysis is a process in which a thin film is deposited by a
solution on a heated surface.
Spraying Drying
Freezing Air drying
13) A phase transition is the transformation of a system.
Thermodynamic Chemical
Mechanical All of these
14) Oxidation is the
Loss of electrons Gain of electrons
Loss of holes Gain of holes
Q.2 Answer the following. (Any four)
Define Nanostructure.
What is mean by ultra thin film?
Define CVD.
What do you mean by thermodynamic?
Define Redox.
08
Write notes on. (Any Two)
Synthesis of nanostructured materials.
Self assembly technique.
Hetero-nucleation growth methods.
06
Q.3 Answer the following. (Any Two)
Explain the synthesis of nanoparticles by sputtering techniques.
Describe with a neat diagram atomic layer epitaxy.
Explain synthesis of oxide nanoparticles.
08
Answer the following. (Any one)
With a neat diagram explain chemical vapor deposition (CVD).
Describe with a neat diagram spray pyrolysis.
06
Q.4 Answer the following. (Any Two)
With a neat block diagram explain sol-gel method.
Explain hot-wire plasma enhanced CVD method.
Explain fundamental of nucleation growth.
10
Answer the following. (Any one)
Explain template based synthesis.
Explain properties of living organism.
04
Q.5 Answer the following. (Any two) 14
Describe with a neat diagram laser ablation technique.
With a neat diagram explain Gas phase synthesis of nanopowder.
Describe with a neat diagram biogenic synthesis by bacteria.