Polyvinyl Alcohol/Polypyrrole/Molecularly Imprinted Polymer Nanocomposite as Highly Selective Chemiresistor Sensor for 2,4‐DNT Vapor Recognition

Abstract

In this research, a chemiresistor sensor coated with the polyvinyl alcohol/polypyrrole/molecularly imprinted polymer (PVA/PPy/MIP) nanocomposite was designed and fabricated to detect the vapor of 2,4‐DNT as a nitroaromatic explosive material. The molecularly imprinted polymer was composed of molecular nanoparticles containing cavities compatible with DNT; while, the nanoparticles were synthesized using PVA and glutaraldehyde as functionalized polymer and cross‐linking agent, respectively. Composition and chemical properties of the synthesized MIP and PPy nanoparticles were investigated using scanning electron microscopy (SEM), infrared Fourier transform spectroscopy (ATR‐FTIR), and X‐ray diffraction (XRD) analyses. Results indicated that the nanoparticles of polypyrrole and the synthesized MIP have an average particle sizes of 56 nm and 45 nm, respectively. Afterwards, sensor surface was coated by a thin layer of nanocomposite composed of PVA, the PPy and MIP nanoparticles. The prepared sensors were calibrated and performance‐tested in a static setup. The developed sensor was used to measure different concentrations (0.1–150 ppm) of the explosive vapor. The coated sensor presented a linear range of response within the concentration range of 0.1–70 ppm. Also, selectivity tests were carried out in the presence of DNT and vapor of other organic matters and the results indicated that the designed sensor possesses high sensitivity and selectivity toward DNT.

Gas Sensors Based on Chemi-Resistive Hybrid Functional Nanomaterials

“…17 d) was another effective approach to improve not only the responsivity, but selectivity (Fig. 17 f) [ 132 ]. Responses of interferon (2,4,6-TNT) and analyte (2,4-DNT) were suppressed and enhanced, respectively, although they are of very similar molecular structure and functional group [ 132 ].…”

Fe‐enriched Clay‐coated and Reduced Graphene Oxide‐modified N‐doped Polymer Nanocomposite: A Natural Recognition Element‐based Sensing Electrode for DNT

“…Considering that the first peak was sharper than the latter, the peak currents corresponding to the first peak were used for calibration and measurements. The corresponding sensor showed an excellent linearity over 0.02 to 10 mg L −1 concentration (standard deviation in measured response=0.04–2.09) (Figure b), with a sensitivity of 427.60 μA mM −1 cm −2 , higher than the earlier reported values . The response (data not shown here) in the blank solution was measured to be in the order of 10 −7 A.…”

“…Many recent studies have been geared towards developing electrodes and recognition elements for the TNT/DNT electrochemical sensors . Examples of recent electrode materials are glassy carbon electrode (GCE) , GCE coated with single‐/multi‐walled carbon nano‐tube (CNT) , organic polymers and graphene . The rGO/CNT‐coated screen printed electrode (SPE) has also been developed .…”

Fabrication of Strontium Nitrate Nanoparticles through a Spraying‐in Non‐Solvent Process Optimized by Taguchi Approach

“…Nanostructured materials obtained considerable attention in advanced materials sciences owing to their unique properties. In the meantime, nanoparticles usually display meaningfully different behaviors from those of similar materials with larger particle sizes …”

“…In the meantime, nanoparticles usually display meaningfully different behaviors from those of similar materials with larger particle sizes. [12][13][14] Until today, various research studies have been direct towards improving different routes used for the fabrication of nanoparticles. [15,16] The spraying-in non-solvent process, which is used for the precipitation of organic or inorganic particles could be used for the preparation of micro or nano materials with a wide range of particle size.…”