Nano-Sheet-like Morphology of Nitrogen-Doped Graphene-Oxide-Grafted Manganese Oxide and Polypyrrole Composite for Chemical Warfare Agent Simulant Detection

Lama, Sanjeeb; Bae, Bong-Gyu; Ramesh, Sivalingam; Lee, Young-Jun; Kim, Nam‐Jin; Kim, Do Kyung

doi:10.3390/nano12172965

Cited by 9 publications

(4 citation statements)

References 75 publications

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“…The use of non-stacked reduced graphene oxide (NSrGO)-hexafluorohydoroxypropanyl benzene (HFHPB) nanosheets that can detect DMMP showing a Δ f of ~ 80 Hz at 64 ppm and response/recovery times of ~ 22/27 s 47 . In comparison, our previous work 42 used NGO@MnO 2 /PPy as sensing materials that showed Δ f of 87.4 Hz, 106.7 Hz, and 125.9 Hz in 50, 75, and 100 ppm DMMP vapor, respectively. At 100 ppm, N-MWCNT@Co 3 O 4 ( k = 374.65 Hz) performed better than NGO@MnO 2 /PPy (Δ f = 125.9 Hz).…”

Section: Resultsmentioning

confidence: 89%

Synthesis and characterization of nitrogen-doped-MWCNT@cobalt oxide for nerve agent simulant detection

Lama,

Choi,

Ramesh

et al. 2024

Sci Rep

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Organophosphorus nerve agents are toxic compounds that disrupt neuromuscular transmission by inhibiting the neurotransmitter enzyme, acetylcholinesterase, leading to rapid death. A hybrid composite was synthesized using a hydrothermal process for the early detection of dimethyl methyl phosphonate (DMMP), a simulant of the G-series nerve agent, sarin. Quartz crystal microbalance (QCM) and surface acoustic wave (SAW) sensors were used as detectors. Nitrogen-doped multiwalled carbon nanotubes (N-MWCNTs), cobalt oxide (Co3O4), and N-MWCNT@Co3O4 were compared to detect DMMP concentrations of 25–150 ppm. At 25 ppm, the differential frequencies (Δf) of the N-MWCNT, Co3O4, and N-MWCNT@Co3O4 sensors were 5.8, 2.3, and 99.5 Hz, respectively. The selectivity results revealed a preference for the DMMP rather than potential interference. The coefficients of determination (R2) of the N-MWCNT, Co3O4, and N-MWCNT@Co3O4 sensors for detecting 25–150 ppm DMMP were 0.983, 0.986, and 0.999, respectively. The response times of the N-MWCNT, Co3O4, and N-MWCNT@Co3O4 sensors for detecting 100 ppm DMMP were 25, 27, and 34 s, respectively, while the corresponding recovery times were 85, 105, and 181 s. The repeatability results revealed the reversible adsorption and desorption phenomena for the fixed DMMP concentration of 100 ppm. These unique findings show that synthesized materials can be used to detect organophosphorus nerve agents.

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Section: Resultsmentioning

confidence: 89%

Synthesis and characterization of nitrogen-doped-MWCNT@cobalt oxide for nerve agent simulant detection

Lama,

Choi,

Ramesh

et al. 2024

Sci Rep

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“…A detailed explanation of targeted vapor generation and sensor measurement systems (vapor generating bubbler, analyte delivery system, detection chamber, and data acquisition) are reported elsewhere [ 42 ]. Briefly, the bubbler flask was purchased from DURAN, which has a volume of 500 mL.…”

Section: Methodsmentioning

confidence: 99%

Synthesis and Characterization of MnO2@Cellulose and Polypyrrole-Decorated MnO2@Cellulose for the Detection of Chemical Warfare Agent Simulant

et al. 2022

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Chemical warfare agents (CWAs) have been threatening human civilization and its existence because of their rapid response, toxic, and irreversible nature. The hybrid nanostructured composites were synthesized by the hydrothermal process to detect the dimethyl methyl phosphonate (DMMP), a simulant of G-series nerve agents, especially sarin. Cellulose (CE), manganese oxide cellulose (MnO2@CE), and MnO2@CE/polypyrrole (PPy) exhibited a frequency shift of 0.4, 4.8, and 8.9 Hz, respectively, for a DMMP concentration of 25 ppm in the quartz crystal microbalance (QCM). In surface acoustic wave (SAW) sensor, they exhibited 187 Hz, 276 Hz, and 78 Hz, respectively. A comparison between CE, MnO2@CE, and MnO2@CE/PPy demonstrated that MnO2@CE/PPy possesses excellent linearity with a coefficient of determination (COD or R2) of 0.992 and 0.9547 in the QCM and SAW sensor. The hybrid composite materials showed a reversible adsorption and desorption phenomenon in the reproducibility test. The response and recovery times indicated that MnO2@CE/PPy showed the shortest response (~23 s) and recovery times (~42 s) in the case of the QCM sensor. Hence, the pristine CE and its nanostructured composites were compared to analyze the sensing performance based on sensitivity, selectivity, linearity, reproducibility, and response and recovery times to detect the simulant of nerve agents.

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“…The FTIR spectra of NGr are displayed in Figure 3B, where absorption peaks are centered at approximately 1138 cm −1 and 1512 cm −1 , respectively, and are attributable to the stretching vibrations of C-N and C=N. A prominent peak is centered at around 1768 cm −1 assigned to C=O stretch [17,18]. However, Figure 3C curve a represents the FTIR spectrum of NGr-NR, where all the characteristic peaks were present for NGr and NR.…”

Section: Ftir Spectroscopymentioning

confidence: 99%

Nitrogen-doped Graphene/Natural Rubber and Sodium Dodecyl Sulfate Modified Nanocomposites: Study on the Electrochemical Properties for the Potential Sensor Response

Md. Shalauddin,

Ab Rahman Marlinda,

Azim Danial Azam

et al. 2024

IJNeaM

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In this study, a piezoelectric composite was developed based on nitrogen-doped graphene/natural rubber (NGr-NR) and an anionic surfactant sodium dodecyl sulfate (SDS) through a simple sonication method. Taking advantage of the high electrical conductivity and high surface area of NGr, the hybrid network of NGr-NR-SDS nanocomposite showed excellent mechanical properties and enhanced electrochemical behavior. Here, NGr was used as functional filler materials incorporated into NR polymeric matrix. SDS was used with NGr-NR composite to reduce the aggregation and promote the interfacial interaction between NGr-NR which enhanced the stability of sensor. The surface morphology of NGr-NR-SDS was investigated by field emission scanning electron microscopy, transmission emission microscopy, and Fourier transform infrared spectroscopy. Cyclic voltammetry and electrochemical impedance spectroscopy of NGr-NR-SDS showed the highest current response of 17 μA and the lowest Rct value of 1920 Ω demonstrating the excellent electrochemical response. The significance of this result is that the developed nanocomposite shows great potential for flexible piezoelectric devices due to excellent electrochemical response and cyclic stability.

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Nano-Sheet-like Morphology of Nitrogen-Doped Graphene-Oxide-Grafted Manganese Oxide and Polypyrrole Composite for Chemical Warfare Agent Simulant Detection

Cited by 9 publications

References 75 publications

Synthesis and characterization of nitrogen-doped-MWCNT@cobalt oxide for nerve agent simulant detection

Synthesis and characterization of nitrogen-doped-MWCNT@cobalt oxide for nerve agent simulant detection

Synthesis and Characterization of MnO2@Cellulose and Polypyrrole-Decorated MnO2@Cellulose for the Detection of Chemical Warfare Agent Simulant

Nitrogen-doped Graphene/Natural Rubber and Sodium Dodecyl Sulfate Modified Nanocomposites: Study on the Electrochemical Properties for the Potential Sensor Response

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