MEMS and Nanotechnology

Q.1. (a) How Band gap modify when sample size is reached to nano size in comparison to Bulk Sample? Explain with an example. [8]

(b) What is CNT? Explain its types. Also write its potential application. [8]

Q.1. (a) What is single electron tunneling? Explain current voltage characteristics of such devices. [8]

(b) How Top down and Bottom up approach are different? Explain their difference with one example. [6]

(c) Draw density of quantum states for nano rod & nano dot. [2]

Q.2. Explain any two processes in detail from the following - (a) PVD (Physical Vapor Deposition) (b) Gettering (c) X-Ray Lithography (XRL) [2x8=16]

Q.2. Explain any two fabrication processes used for nano size structure in detail. [2x8=16]

Q.3. (a) Explain Scherrer's equation for determine the size of a nano sample. Also explain the broadening of XRD peak from sharp to wide when sample decreases from Bulk to nano cluster. [8]

(b) Draw the schematic diagram of an Atomic Force Microscopy (AFM). Explain its working and order of resolution. [8]

Q.3. (a) What is the working principle of "Raman Spectroscopy"? Write its potential application for material characterization. [8]

(b) Find the order of resolution obtained in scanning electron microscopy when its working voltage is - (i) 20 kV (ii) 20 MV [8]

Q.4. (a) Explain the working of nano sensor with respect to their counter Bulk Sensor. Why these sensors are superior? [8]

(b) Explain the electronic properties of nano wire and nano dots. Also discuss the reliability issues of these structure. [8]

Q.4. (a) Prove that the energy levels in a Quantum Dot is given by E(nx,ny,nz) = (h^2 / 8mL^2) * [nx^2 + ny^2 + nz^2]. [8]

(b) Explain the working/functional difference of nano medicine. What is the present status of these medicine in real life? [8]

Q.5. Write short note on any two - (a) Micro electronics (b) Applications of MEMS (c) Fabrication Technology of MEMS (d) Future of MEMS (e) Present Status of MEMS Technology [2x8=16]