_ Nanobiosensing tools section in (Nanoelectric)


( Nanobiosensing devices)  and  electrical nanobiosensors and help in the detection of radiation and biological toxins

Researcher  and Author: Dr.   (   Afshin Rashid)



Note: In the military and national security sector, there is a need for highly sensitive sensors that can be widely distributed to help them  monitor radiation and biological toxins. In the medical field, there  is a need for highly sensitive sensors in the form of labs on a chip that can detect the smallest signs of cancer. In the aerospace industry, there is a need for nanosensors that  can be placed in the fuselage of aircraft as a fixed warning system and determine when the aircraft needs repairs.  These nanosensors can be used according to the state of existing controls to suit different body states.

Sensors in nanoelectronics have changed the paradigm and increased the performance and application of nanostructures due to their high surface-to-volume ratio and high surface activity, which have the potential to be used as sensors - especially gas sensors. In the meantime, nanosensors have a greater detection ability than other types of electronic nanostructures due to their high surface permeability and low density. Single-walled and multi-walled carbon nanotubes have found a variety of applications due to their unique mechanical and electronic properties  , including their use as very high-precision sensors for detecting substances at very low concentrations and at high speeds  .

In general, the use of nanotubes in sensors can be divided into two categories:

1_  (Carbon nanotubes as chemical sensors: These sensors can  detect very small concentrations of gas molecules with very high sensitivity at room temperature. Chemical sensors consist of a collection of single-walled nanotubes and can  detect chemicals such as nitrogen dioxide and ammonia. The electrical conductivity of a single-walled semiconducting nanotube  placed in the presence of 0.11 ppm of nitrogen dioxide can increase by a factor of three within a few seconds, and the conductivity  will double for the addition of only 0% ammonia. Sensors made from single-walled nanotubes have high sensitivity and also have a fast response at room temperature.  These properties have important consequences in diagnostic applications. 

 2_  Carbon nanotubes as mechanical sensors: When a nanotube is moved up or down by an object, its electrical conductivity changes. This change in electrical conductivity is fully proportional to the mechanical deformation of the nanotube.



Function and application of nanosensors (medical_environmental)

Nanosensors require the use of nanoscale sensors to accurately measure parameters at the nanoscale, such as physical changes or the presence of chemical species. Nanosensors use nanoscale sensing elements, which are sensitive enough to use nanomaterials.  Materials from which nanosensors are made must also have high durability, strength, and good electrical properties.  In general, the important features of nanosensors are higher selectivity, greater sensitivity, smaller dimensions, and lower cost. Nanosensors are inherently  smaller and more sensitive than other sensors, and as we have said, they have the potential to  be less expensive than other sensors on the market.


Conclusion: 

In the military and national security sectors, there is a need for highly sensitive sensors that can be widely distributed to  monitor radiation and biological toxins. In the medical field, there  is a need for highly sensitive sensors in the form of labs on a chip that can detect the slightest signs of cancer. In the aerospace industry, there is a need for nanosensors that  can be installed in the fuselage of aircraft as a fixed warning system and determine when the aircraft needs repairs.  These nanosensors can be used according to the state of existing controls to suit different body states.

Researcher  and Author: Dr.   (   Afshin Rashid)

Specialized PhD in Nano-Microelectronics