11-05-2013, 12:35 PM
NANOWIRE SENSORS
NANOWIRE.pptx (Size: 296.6 KB / Downloads: 80)
Introduction
Nanowire is a nano structure of the diameter 10−9 meters.
There are different types of Nanowires like Metallic, Semiconducting and Insulating Nanowires.
Ni, Pt, Au are Metallic, Si, InP, GaN are Semiconducting and SiO2, TiO2 are Insulating Nanowires.
DNA can be considered as Molecular nanowires comprising of repeating molecular organic units.
Nanowire Sensors
A sensor is a device which receives and responds to a signal.
Nanowire sensors are those which are made up of Nanowires.
They have high detection sensitivity and response time.
Electronic Nose Concept
An electronic nose is a device intended to detect odors and flavors.
Electronic sensing- capability of reproducing human senses using sensor arrays and pattern recognition systems.
The stages of recognition are similar to human olfaction.
E- Nose Principle
Electronic nose consists of three major systems:
Sample Delivery system- Generates headspace and injects them into the detection system.
Detection or Sensing system-”reactive part” which detects the change of electrical properties and converts them into a digital signal.
Computing system- It combines all the inputs from various sensors which represents the input for data treatment.
Advantages of Using Nanowires in detecting systems
When Nanowire sensors are used in making sensor arrays
Accuracy is maintained in detecting charges and electric field changes.
Recorded signals will be more precise.
Reaction of headspace with the sensors increase due to large area of contact.
The transistors in MOSFET will not have any exceptions which are normally encountered with conventional ones.
The problem of obtaining incorrect results due to mismatching of the samples with original database are eliminated since they are compared from a nano level.
Applications of Electronic Nose
The electronic Nose instruments find a large number of applications in
Research & Development
laboratories.
Quality Control
Laboratories.
Process and production
departments
Other Applications
They are also used to analyze in certain areas & companies like:
Flavor and Fragrance.
Food and Beverages.
Packaging.
Pharmaceuticals.
Chemicals.
Cosmetics and Perfumes.
Conclusion
There are two conclusions from this Presentation
Electronic Nose is a wonderful Boon for the future of Electronics.
By using Nanowire Sensors the applications of Electronic Nose are made enormous and effective.