Ph.D. Course Work Examination Jan/Feb-2018
Physics (Paper III and Paper IV
ADVANCED DEVELOPMENT IN PHYSICS SOLID STATE GAS SENSOR DEVICES
Day Date: Friday, 19-01-2018
Max. Marks: 100
Time: 11.00 AM to 02.00 PM
Instructions: All questions are compulsory.
Q.1

Write basic concept, working and essentials of spray pyrolysis technique.
10

Write a short note on any two:
10
Applications of schottky barrier diode
Role of fuels in the combustion synthesis method
Mechanism of FET gas sensors with one example
Q.2

What is the electrochemical deposition? Explain the Kinetics and Mechanism behind electrochemical deposition.
10

Write a short note on any two:
10
Applications of chemical vapour deposition
Catalysts and promoters
Characteristics of electrochemical gas sensor
Q.3

Give the mechanism of solid electrolyte gas sensor with one example.
10

Write a short note on any two:
10
Advantages of thick film sensors
Role of small grains polycrystalline materials over large grains
Ionosorption
Q.4

Explain the working principle of semiconductor gas sensor and give its applications.
10

Write a short note on any two:
10
Advantages of thin film sensor over pallet
Surface space charge region
Thick film technology
Q.5

Define gas sensor? What are differences between electro chemicals and FET base gas sensors?
10

Write a short note on any two:
10
Commercial solid state gas sensor
Physical and chemical adsorption
Effect of defect on electrical behaviour of materials