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03-03-2010, 08:04 PM

sir please provide me information about NEMS as im having seminar and presentation sir plz send me d full report
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Posts: 549
Joined: Mar 2010
04-03-2010, 06:59 PM

A biosensor is generally defined as a measurement system that consists of a probe with a sensitive biological recognition element, or bioreceptor, a physicochemical detector component, and a transducer in between.
A biosensor consists of usually three components 1) BIORECEPTORS 2) TRANSDUCERS
Bio receptors“ It is a sensitive biological element . Transducer -Transduction can be accomplished by optical, electrochemical, and mass detection methods .
The three types of Nano sensors with medical application possibilities are a) Cantilever array sensors and b) Nanotube sensors c) Nanowire sensors.
a)Cantilever array sensors:
Microfabricated cantilever array sensors are used as ultra-sensitive mechanical sensors converting (biochemical or physical processes into a recordable signal in microelectromechanical systems (MEMS) or nanoelectromechanical systems (NEMS).Cantilevers are typically rectangular-shaped silicon bars. The unique feature of microcantilevers is their ability to undergo bending due to molecular adsorption or bindinginduced changes in surface tension.

b) Nano tube based sensors:
Nano-sized carbon tubes coated with strands of DNA can create tiny sensors with abilities to detect odors and tastes, According to the researchers, arrays of these nanosensors could detect molecules on the order of one part per million, akin to finding a one-second play amid 278 hours of baseball footage or a single person. The researchers tested the nanosensors on five different chemical odorants, including methanol and dinitrotoluene, or DNT, a common chemical that is also frequently a component of military-grade explosives. The nanosensors could sniff molecules out of the air or taste them in a liquid, suggesting applications ranging from domestic security to medical detectors.

c) Nanowire-based sensors:
IT is a hybrid of two molecules that are extremely sensitive to outside signals: single stranded DNA, which serves as the 'detector,' and a carbon nanotube, which functions as 'transmitterâ„¢. By putting the two together and they become an extremely versatile type of sensor, capable of finding tiny amounts of a specific molecule." The size of such sensors each carbon nanotube is about a billionth of a meter wide.

a) Nanoarray-based biodetection:
These nanoarrays occupy a surface area thousands of times smaller than a standard microarray and therefore present many novel applications. Three of the applications we will demonstrate are cytokine expression profiling nanoarrays for small animal model systems, reverse-phase nanoarrays for profiling malignant progression from laser capture microdissected tissue samples, and a nanoarray-based pathogen detection platform with biodefense applications called the ViriChip.

b) Nanoparticle-based biodetection

Full report:

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