Detection of Explosives based on the Work Function Read-out of Molecularly Imprinted Polymers

Pohle, Roland; Jeanty, P.; Stegmeier, S.; Hürttlen, Jürgen; Fleischer, M.

doi:10.1016/j.proeng.2012.09.411

Cited by 4 publications

(2 citation statements)

References 4 publications

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“…Molecularly imprinted polymers (MIPs) principally have this advantage, offering specific molecular recognition sites, and can be used as selective recognition elements in sensors [19,20]. Selective detection of TNT without pre-separation by means of MIPs was already demonstrated using a mass sensitive readout [21] and other techniques [22,23], including electrochemical [24] and optical readouts via fiber or interferometer structures [25,26,27]. Nevertheless, with most of the described techniques, TNT concentrations in the lower ppb range are still hardly measurable.…”

Section: Introductionmentioning

confidence: 99%

Molecularly Imprinted Sol-Gel for TNT Detection with Optical Micro-Ring Resonator Sensor Chips

Eisner

Wilhelm

Flachenecker

et al. 2019

Sensors

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A sensor for trinitrotoluene (TNT) detection was developed by using a combination of optical micro-ring technology and a receptor coating based on molecularly imprinted sol-gel layers. Two techniques for deposition of receptor layers were compared: Airbrush technology and electrospray ionization. A concentration of less than 5 ppb for TNT in the gas-phase, using electrospray deposition of the receptor layer, was detected. The cross-sensitivities to organic substances and further nitro-based explosives were compared. As a result, the sensitivity to TNT is about one order of magnitude higher in comparison to the explosives 2,4-dinitrotoluene (DNT) or 1,3-dinitrobenzene (DNB) and about four orders of magnitude higher than the organic substances phenol, ethanol, and acetone. The signal response of the sensor is fast, and the compact sensor design enables the deposition of different receptor layers on multiple optical micro-rings on one chip, which allows a more precise analysis and reduction of side effects and false alarms.

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Section: Introductionmentioning

confidence: 99%

Molecularly Imprinted Sol-Gel for TNT Detection with Optical Micro-Ring Resonator Sensor Chips

Eisner

Wilhelm

Flachenecker

et al. 2019

Sensors

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“…Due to the high mechanical strength and flexibility, molecularly imprinted polymers (MIPs) were recently utilized to fabricate highly sensitive, selective and cost-effective molecular recognition materials [14][15][16][17]. Referred to as antibody mimics, the artificial materials contain thousands to millions of target-shaped cavities, which could bind specific molecules [18][19][20][21] and reduce the cross-absorptivity of the targets' analogues. And the state of MIPs have been used to enable TNT detection through the use of fluorescence [22,23], quartz crystal microbalance (QCM) [24,25], and surface plasma resonance measurements [26].…”

Section: Introductionmentioning

confidence: 99%

Visual detection of 2,4,6-trinitrotolune by molecularly imprinted colloidal array photonic crystal

Asher

Meng

et al. 2016

Journal of Hazardous Materials

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We developed a photonic crystal (PhC) sensor for the quantification of 2,4,6-trinitrotoluene (TNT) in solution. Monodisperse (210nm in diameter) molecularly imprinted colloidal particles (MICs) for TNT were prepared by the emulsion polymerization of methyl methacrylate and acrylamide in the presence of TNT as a template. The MICs were then self-assembled into close-packed opal PhC films. The adsorption capacity of the MICs for TNT was 64mg TNT/g. The diffraction from the PhC depended on the TNT concentration in a methanol/water (3/2, v/v) potassium dihydrogen phosphate buffer solution (pH=7.0, 30mM). The limit of detection (LOD) of the sensor was 1.03μg. The color of the molecularly imprinted colloidal array (MICA) changed from green to red with an 84nm diffraction red shift when the TNT concentration increased to 20mM. The sensor response time was 3min. The PhC sensor was selective for TNT compared to similar compounds such as 2,4,6-trinitrophenol, 2,4-dinitrotoluene, 2,6-dinitrotoluene, 2-nitromesitylene, 4-nitrotoluene, 2-nitrotoluene, 1,3-dinitrobenzene, methylbenzene, 4-nitrophenol, 2-nitroaniline, 3-aminophenol and 3-nitroaniline. The sensor showed high stability with little response change after three years storage. This sensor technology might be useful for the visual determination of TNT.

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Nanoscale Graphene-Based Environmental Gas Sensing

Muruganathan

Mizuta

2019

Nanotechnology Characterization Tools for Environment, Health, and Safety

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Detection of Explosives based on the Work Function Read-out of Molecularly Imprinted Polymers

Cited by 4 publications

References 4 publications

Molecularly Imprinted Sol-Gel for TNT Detection with Optical Micro-Ring Resonator Sensor Chips

Molecularly Imprinted Sol-Gel for TNT Detection with Optical Micro-Ring Resonator Sensor Chips

Visual detection of 2,4,6-trinitrotolune by molecularly imprinted colloidal array photonic crystal

Nanoscale Graphene-Based Environmental Gas Sensing

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