Detection of Triacetone Triperoxide (TATP) Precursors with an Array of Sensors Based on MoS2/RGO Composites

Abstract

Triacetone triperoxide (TATP) is a self-made explosive synthesized from the commonly used chemical acetone (C3H6O) and hydrogen peroxide (H2O2). As C3H6O and H2O2 are the precursors of TATP, their detection is very important due to the high risk of the presence of TATP. In order to detect the precursors of TATP effectively, hierarchical molybdenum disulfide/reduced graphene oxide (MoS2/RGO) composites were synthesized by a hydrothermal method, using two-dimensional reduced graphene oxide (RGO) as template. The effects of the ratio of RGO to raw materials for the synthesis of MoS2 on the morphology, structure, and gas sensing properties of the MoS2/RGO composites were studied. It was found that after optimization, the response to 50 ppm of H2O2 vapor was increased from 29.0% to 373.1%, achieving an increase of about 12 times. Meanwhile, all three sensors based on MoS2/RGO composites exhibited excellent anti-interference performance to ozone with strong oxidation. Furthermore, three sensors based on MoS2/RGO composites were fabricated into a simple sensor array, realizing discriminative detection of three target analytes in 14.5 s at room temperature. This work shows that the synergistic effect between two-dimensional RGO and MoS2 provides new possibilities for the development of high performance sensors.

Enhanced gas sensing performance of perovskite YFe1−xMnxO3 by doping manganese ions

“…The fabrication and testing of sensors are the same as the previous reports. 13,25 Specically, sensors based on YFe 1Àx Mn x -O 3 (x ¼ 0, 0.025, 0.05, 0.075 and 0.1) were fabricated by coating the paste of YFe 1Àx Mn x O 3 on a ceramic substrate by a thin brush to form a sensing lm on which silver interdigitated electrodes with both nger-width and inter nger spacing of about 200 mm was previously printed. The sensors based on YFe 1Àx Mn x O 3 (x ¼ 0, 0.025, 0.05, 0.075 and 0.1) were dened as S1, S2, S3, S4 and S5, respectively.…”

“…In terms of actual sensing requirements, controlling and monitoring the toxic, inammable and explosive gases, such as formaldehyde (CH 2 O), ethanol (C 2 H 6 O) and hydrogen peroxide (H 2 O 2 ), is important for industrial production, indoor life and public safety. 13,[23][24][25] Doping can change the composition, carrier density and surface states of sensing materials, which is an effective strategy to regulate the structure and the gas-sensitive properties, as well as an important means to study the gas-sensitive mechanism of semiconductor materials. 26,27 In our work, the hierarchical YFe 1Àx Mn x O 3 was prepared by hydrothermal method and the substitution of Mn ions at Fe site was achieved, because of the close ionic radius of Mn 3+ (0.580 A), Mn 2+ (0.670 A) and Fe 3+ (0.645 A).…”

Qualitative Detection Toward Military and Improvised Explosive Vapors by a Facile TiO2 Nanosheet-Based Chemiresistive Sensor Array

“…To the best of our knowledge, the morphology of nanomaterials has significant impact on their gas sensing performance since the geometric morphology difference can cause different specific surface area and the change in electron depletion layer (Gurlo, 2011;Cho et al, 2013). Hence, gas sensory array based on MoS2/RGO composites with various morphologies has been constructed for the recognitive detection of Triacetone Triperoxide (TATP) precursors (Sun et al, 2019). Furthermore, utilizing the fluorine as the capping agent for exposure facets stabilization, the morphology of TiO 2 nanomaterials with treatment could be well tailored by modulating the synthesis parameters, including F sources, the concentration of the source, reaction temperature and time, and so on (Lee et al, 2016;Yan et al, 2017;Zhao et al, 2017).…”

Surface Persistence of Trace Level Deposits of Highly Energetic Materials

“…The residence time of a highly energetic material (HEM) on a surface can be defined as the time that the material persists on the surface after its deposition. The concept is essential for the development of samples and standards for trace detection systems [1][2][3][4][5][6][7][8][9][10][11][12]. Aside from adhesion considerations, the residence time mainly depends on the vapor pressure of the compound and surface-HEM interactions.…”