ChemiFluorescence Explosives Detection Sensor

New innovation in the field of explosives detection.

 
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New Incoming

Since the beginning of research and development process, Biosecumax has developed a completely new method apart from the conventional method. Ever since we have been pursuing technology development, we have endeavored to make 'Innovative progress of explosive detection capability' which complemented the shortcomings and limitations of existing IMS technology. We have repeated many trials, errors and failures in the research and development process for about 6 years. As we have accumulated the experience of the technology gradually, we have recently completed the development of the technology that can be commercialized and utilized.

 Developing a sensor

Developing a sensor

Biosecumax's CF sensor technology (ChemiFluorescence) that has been developed at this time is the world's first innovative sensor technology. Nitro-based explosives, which make up most of the explosives, are naturally and consistently produced by explosive nitrogen (vapor) and are contained in air particles around explosives. However, these particles are very microscopic and have a density of parts-per-billion (ppb). Therefore, the existing IMS technology was used to track the traces of the explosive by measuring the mass of the ions by collecting the residue of the explosive using cloth, non-woven fabric, paper, etc., and it was difficult to directly detect the actual presence explosive.

However, Biosecumax’s CF sensor technology inhales air near explosives and reacts very minute amounts of nitro particles (Vapor) in the air with sensors coated with electronically fluorescent silicon nano-polymer compounds to determine whether the object to be detected is an explosive.

 Developing sensor blocks

Developing sensor blocks

The Biosecumax CF sensor technology has developed an in-house detection sensor based on a polymer compound material, which emits fluorescence from visible light, with high quantum efficiency and stability to heat. The CF sensor receives energy from a laser diode light source that is designed to generate a quenching phenomenon precisely according to the movement of electrons, depending on the change in surface of the CF sensor while maintaining stable fluorescence state. The microscopic signal of the extinction phenomenon due to electron movement is analyzed about 100 times per second. And this is the world's first CF sensor technology that amplifies the signal and detects the presence of explosives by a specially designed detection algorithm.

The CF sensor receives energy from a light source of a specific wavelength and transitions to a conduction band state in the state of valence band to maintain fluorescence. The CF sensor responds to the inhaled explosive vapor, and the electrostatic attraction and electronegativity possessed by the electronegative compounds of the Si and nitro moieties cause electrons that lack nitrous molecules in the inhaled air to be taken away from the CF sensor, being transferred to the LUMO level. And partial quenching occurs on the surface of the CF sensor that has lost the electrons. In other words, in the "electronic electroluminescent silicone nanoparticle compound sensor" which is an electron floating compound, electrons move to an explosive which is an electron shortage substance having a nitro group, thereby detecting extinction occurring in the CF sensor.

*LUMO  : lowest unoccupied molecular orbital

*HOMO : highest occupied molecular orbital

 Detection illustration

Detection illustration

Most explosive detectors available to date use IMS(Ion Mobility Spectrometry) technology, or technologies derived from IMS (Ion Mobility Spectrometry). An IMS device can detect and identify explosives or drugs only if the explosive particles are secured directly, using a cotton swab, aluminum pad or sweep pad.

Recently, some companies such as X-ray scanners, have been selling equipment that injects high-pressure air into the body of a person in a portal such as a full-body scanner, drops particles attached to the body, collects the air and uses IMS technology. However, it is known that it’s not more effective than detecting the explosive by sweeping PAD such as conventional cotton swabs.

On the other hand, the biggest advantage of Biosecumax’s CF sensor technology is that the breakthrough technology that can detect NITRO particles (vapors) at low density, which are naturally and continuously occurring in explosives. The CF sensor technology of most of the explosion detectors developed so far shows the sensing ability to detect very small amount of low density nitrous particles (Vapor), and it detects the explosive molecule of small amount of TNT, PETN, RDX series. Even if an explosive was contained in the bag or was moved to another place, the CF sensor, which detects vapor, can detect the trace of the explosive. On the other hand, IMS equipment that measure the ion mass of a molecule cannot detect explosives in such situations because particles cannot be secured if the outside of the equipment or bag is wiped clean with water towel, even if the explosive is contained in the bag.

 
Robert Kim