Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech IV SYNTHESIS AND CHARACTERIZATION OF NANOMATERIALS Previous Question Paper (December - 2019 - R16)
Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks.
Part A
What is sputtering?
Answer
Sputtering is a physical vapor deposition process where atoms are ejected from a solid target material due to bombardment by energetic particles, typically positive ions from a plasma, which then deposit onto a substrate to form a thin film.
Explain Sol-Gel method.
Answer
The Sol-Gel method is a chemical solution deposition technique used to produce solid materials from small molecules. It involves the transition of a system from a liquid 'sol' (colloidal suspension of particles) into a solid 'gel' phase, followed by drying and thermal treatment to form ceramics or glass-like nanostructures.
What are Nano crystals?
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What are the applications of Nano crystals?
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What is bright field imaging?
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What is the importance of beam spot size?
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What is atomic force microscopy used for?
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What is the difference between AFM and SEM?
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Define Bragg’s law of X-Ray diffraction.
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How to calculate crystal size by using Scherer formula?
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Part B
What are the approaches of Nano Material Synthesis and discuss about solution combustion synthesis.
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Briefly explain about Physical Vapor Deposition and Chemical Vapor Deposition.
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Explain photo chemical synthesis with a neat sketch.
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Discuss briefly about Nanocrystals by chemical reduction.
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What is Scanning Electron Microscope and explain the theory of operation.
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Explain Electron diffraction and High Resolution TEM.
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Discuss about the interactive forces, force curves and force measurements in Atomic force microscope.
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What is tip functionalization and explain the factors considered and steps involved in it.
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What is X –Ray powder diffraction? How does it work, write applications and limitations of it.
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Explain about the Primary Metallic Crystalline Structures of BCC, FCC, and HCP.
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