Investigation on visible light assisted gas sensing ability of multi-walled carbon nanotubes coated with pyrene based organic molecules

Tuning the π-Conjugation of 2-Thiohydantoins toward a Rigorously Defined Detection of Volatile Organic Compounds by Surface Photovoltage

“…6 Elakia and co-workers have investigated the gas sensing properties of pyrene containing −COOH functionality coated on multiwalled carbon nanotubes under visible light and observed that−COOH groups in pyrene show strong intermolecular hydrogen bonding through D−A interaction, thus furnishing a high selectivity for TEA with good response and recovery. 7 Recently, we have reported on the polymorphism-induced gas adsorption on the surface of the naphthalic dimide adorned phenothiazine unit, demonstrating that surface morphology and interaction sites induce selective photoresponse toward VOCs. 8 Tuning the D− A architecture with different donor and acceptors with better overlapping of electron density leads to a selective response to the VOCs, and fast recovery is attainable.…”

“…Marappan et al have demonstrated that the gas adsorption behavior of naphthalene appended DPP molecules functionalized with ZnO nanostructures prepared at different pHs (pH 9 and 11) showed a higher photoresponse toward 1-hexanol at pH 11 . Elakia and co-workers have investigated the gas sensing properties of pyrene containing −COOH functionality coated on multiwalled carbon nanotubes under visible light and observed that–COOH groups in pyrene show strong intermolecular hydrogen bonding through D–A interaction, thus furnishing a high selectivity for TEA with good response and recovery . Recently, we have reported on the polymorphism-induced gas adsorption on the surface of the naphthalic dimide adorned phenothiazine unit, demonstrating that surface morphology and interaction sites induce selective photoresponse toward VOCs .…”

Graphene Oxide based Gas Sensor for Triethylamine Detection at Room Temperature

“…The schematic illustration of SKP measurement setup is shown in figure 2a. The complete principle and working of SKP system is explained in our previous papers [18][19][20]. There are changes in CPD based on VOCs adsorption on the substrate (Fig.…”

Carbon Nanostructure Embedded Novel Sensor Implementation for Detection of Aromatic Volatile Organic Compounds: An Organized Review

“…These materials have been shown to be more effective in producing higher VOC sensors. − Three steps commonly take place in gas sensors manufactured using CNMs for VOC detection: (i) trapping of VOC gas, (ii) their interaction with the sensing active site, and (iii) dispersing of the VOC gas. Focusing on the complex interactions between the VOC gas and the active center that detects them, CNMs have been used to create a range of VOC gas sensors, including optical ,− and microgravimetric ones. − Regarding optical sensors, spectrometric or colorimetric variations in the sensing materials are brought on by the intermolecular interactions among VOC samples and the active center ,− and resistance-based sensors. ,,− …”

“…The presence of π-electron conjugation results in high charge transfer in carbon-based materials . Generally, the detection of VOCs is governed by their interaction with carbon-based materials by diffusion and sensed by the active center of carbon-based materials, − microgravimetric sensors, − and resistive sensors. − When a molecule species interacts with the sidewalls of carbon-based or any semiconductor materials during gas detection, changes in conductance , (due to charge transfer or mobility change) or capacitance (from inherent or induced dipole moments) occur. − The interaction between the VOCs and carbon-based compounds (rGO, CNTs, and CDs) depends strongly on the architecture and design of the composites or materials which may have a larger contact area, thus allowing greater sensitivity. The CNT has two variables, SWCNT and MWCNT.…”