GUJARAT TECHNOLOGICAL UNIVERSITY
SEMESTER-IV(NEW) — EXAMINATION - SUMMER 2019
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Subject Code:2143902 Date:15/05/2019
Subject Name: Physics of Nanomaterials
Time:02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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MARKS
Q.1
(a) What is Lattice and Lattice point? 03
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(b) Explain Direct and Indirect Band Gap in Semiconductor. 04
(c) Write a short note on Energy Band Gap in Solids. 07
Q.2
(a) Define Chiral Vector in Carbon Nanotube. 03
(b) Explain types of CNTs. 04
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(c) Write a short note on Carbon Nanotubes. 07
OR
(c) Describe Unit Cell, Chiral Angle, Chiral Vector of CNTs. 07
Q.3
(a) What is Type I Hetero Structure? 03
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(b) What is Type II Hetero Structure? 04
(c) Describe Classification of Quantum Confined System. 07
OR
Q.3
(a) Define Reciprocal Vectors. 03
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(b) Explain Reciprocal Lattice. 04
(c) Describe Brillouin Zone. 07
Q.4
(a) What is Spherical Cluster Approximation? 03
(b) Describe Interior and Exterior Surface Area: 04
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(c) Explain Surface to Volume Ratio with Diagram. 07
OR
Q.4
(a) Define Quantum Confinement Effect. 03
(b) Explain 2D, 3D Nanomaterials with Examples. 04
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(c) Write a note on applications of Carbon Nanotubes. 07
Q.5
(a) What is Reciprocal space? 03
(b) Explain Photonic Crystal. 04
(c) Write a note on Hetero Structures. 07
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OR
Q.5
(a) What is Quantum well, Quantum wire, Quantum dot? 03
(b) Describe type of Excitons and Binding Energy. 04
(c) Write short note on Excitons. 07
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