Amperometric sensing of hydrogen peroxide vapor for security screening

Abstract

Rapid detection of the hydrogen peroxide precursor of peroxide explosives is required in numerous security screening applications. We describe a highly sensitive and selective amperometric detection of hydrogen peroxide vapor at an agarose-coated Prussian-blue (PB) modified thick-film carbon transducer. The sensor responds rapidly and reversibly to dynamic changes in the level of the peroxide vapor, with no apparent carry over and with a detection limit of 6 ppbv. The remarkable selectivity of the PB-based screen-printed electrode towards hydrogen peroxide leads to effective discrimination against common beverage samples. For example, blind tests have demonstrated the ability to selectively and non-invasively identify concealed hydrogen peroxide in drinking cups and bottles. The attractive performance of the new microfabricated PBbased amperometric peroxide vapor sensor indicates great potential for addressing a wide range of security screening and surveillance applications.

Developing an amperometric hydrogen peroxide sensor for an exhaled breath analysis system

“…We have measured a volume flow rate of approximately 0.7 cm 3 s −1 for the sample resulting in a residence time of 0.4 s in the tube connecting the gas sampling bag and the measurement cell. H 2 O 2 sensors based on similar agarose layers showed sensor response times of less than 1 min . Therefore, we attribute the current fluctuations observed at our sensor to mixing effects inside of the measurement chamber during the stopped flow measurement.…”

Balloon‐Embedded Sensors Withstanding Extreme Multiaxial Stretching and Global Bending Mechanical Stress: Towards Environmental and Security Monitoring

“…Electrochemical devices are advantageous for addressing the urgent needs for on‐site detection of nitroaromatic explosives, such as 2,4,6‐trinitrotoluene (TNT) or 2,4‐dinitrotoluene (DNT) and of peroxide‐based homemade explosives and their hydrogen peroxide (H 2 O 2 ) precursor . The ability of the balloon‐embedded sensors to detect explosives has been evaluated first in the liquid‐phase using variety of relevant mechanical strains associated with the balloon inflation.…”

Cavitas Sensors: Contact Lens Type Sensors & Mouthguard Sensors

“…The mouthguard biosensor system is based on a printable Prussian‐Blue (PB) transducer and a poly‐orthophenylenediamine (PPD)/lactate‐oxidase (LOx) reagent layer. Prussian‐blue acting as “artificial peroxidase”, offers a highly selective detection of the hydrogen peroxide product of oxidase biocatalytic reactions . PB has been widely used for oral treatment of poisoning by the heavy metals like thallium and cesium, and its use appears to be very safe under physiological conditions even following high oral doses .…”

“…Them outhguard biosensor system is basedo nap rintable Prussian-Blue( PB) transducera nd ap oly-orthophenylenediamine (PPD)/lactate-oxidase (LOx) reagent layer. Prussian-bluea ctinga s" artificial peroxidase", offers ah ighlys elective detection of the hydrogen peroxide product of oxidaseb iocatalytic reactions [155][156][157]. PB has been widely used for oral treatment of poisoning by the heavy metals like thallium and cesium,a nd its use appears to be very safe under physiologicalc onditions even following high oral doses [158][159][160].P oly-orthophenylenediamine (PPD) is commonly employed for the electropolymeric entrapmento fo xidases,r ejectiono fp otential interferences and protection of the biosensor surface [161][162][163].S uch coupling of the extremely low-potential detection of the peroxide product afforded by the PB transducer and the exclusion of electroactive constituents of whole saliva leads to high selectivity and stability.…”