Nanomaterials Characterization (ELEDSE8E) — DU B. Sc. (Hons) Electronics Previous Year Question Papers

Instruction for Candidates 1. (a) What are the characteristic properties ofmaterials in the nanoscale? (b) List any three disciplines involved in nanotechnology and explain why the 3 field is interdisciplinary. (c) Define atomic scattering factor. 3 (d) (e) (I) What is meant by blue shift in the absorption edge ofnanomate`rials? 3 What is a microemulsion? Mention its importance in nanomaterial synthesis. 3 List the diiferent biological systems used for nanoparticle synthesis 3 2. (a) Explain the` Bottom-up and Top-down approaches `for the synthesis of 6 a) De.scribe the Physical Vapour Deposition (PVD) method with consolidation 6 (c) 3.. (a) Explain the sol-gel process` for synthesizing nanoparticles. Discuss the main 6 steps involved in t_he method. What is Atomic Force Microscopy (AFM)? Discuss the working principle of 6 AFM in three different modes with suitable diagrams and its applications (b) Derive Bragg's law for diffraction ofx-rays by crystal planes with the help of 6 a suitable diagram. (c) The graph given below shows an X-ray Diffraction (XRD) pattern of a 6 crystalline nanomaterial obtained using Cu K-Ci radiation (For Cu KCi = Position [°2Theta] (Cu Kralpna} B.riefly explain the information that can be extracted from the above graph. 4. (a) E`xplain the working principle of a Fourier Transform Infrared (FTIR) 6 spectrometer with the help of a schematic diagram. (b) Explain the Raman effect and discuss the origin of Stokes and anti-Stokes 6 (c) Describe the working principle and layout of a photoluminescence 6 5. (a) The hysteresis curve obtained for CoFe204 nanoparticles using Vibrating 6 Sample Magnetometer (VSM) is shown in the figure given below: Applied Field (Oe) Briefly explain the information that can be extracted from the above graph. (b) Briefly explain the principle and working of the Four`-Probe Method with a 6 suitable diagram. 6. (a) Describe the working principle of Transmission Electron Microscope (TEM) 6 with appropriate diagram and its application in material characterization. (b) Explain the plant-mediated synthesis ofnanoparticles with its advantages and 6 (c) Discuss diffraction pattern for different types of materials such as gases, 6 1iquids, amorphous solids_, and crystals. 7. (a) Explain how luminescence studies help in analyzing the electronic structure 6 (b) Write a short note on the Magnetoresistance. 6 (c) Exp`1ain the working principle and experimental setup of a Vibrating Sample 6 Magnetometer (VSM) with a neat schematic diagram. Discuss how the magnetization of a sample is measured