Improving sensing properties of entangled carbon nanotube-based gas sensors by atmospheric plasma surface treatment

Santhosh, N.; Vasudevan, Aswathy; Jurov, Andrea; Korent, Anja; Slobodian, Petr; Zavašnik, Janez; Cvelbar, Uroš

doi:10.1016/j.mee.2020.111403

Cited by 16 publications

(6 citation statements)

References 40 publications

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“…Fabrication of E-noses is possible with good sensing materials. To date, various materials have been explored for gas sensors in different sensing modalities, including conducting polymers, 1,2 metal nanoparticles, 3 metal oxides, 4 carbon nanotubes, 5 graphene, 6 and porphyrins. 7 Each of Sumedh M. Shirsat and Gajanan A. Bodkhe have contributed equally to this work.…”

Section: Introductionmentioning

confidence: 99%

Multivariate Analysis of a Cobalt Octaethyl Porphyrin-Functionalized SWNT Microsensor Device for Selective and Simultaneous Detection of Multiple Analytes

Shirsat¹,

Bodkhe

Sonawane

et al. 2021

J. Electron. Mater.

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Multivariate analysis is carried out for single-walled carbon nanotubes (SWNTs) functionalized with a cobalt octaethyl porphyrin (CoOEP) chemiresistive sensor device for selective and simultaneous detection of multiple analytes. The chemiresistor was prepared on Si/SiO 2 substrate with photolithographically patterned gold microelectrodes having a 3-µm gap. SWNTs were aligned dielectrophoretically and functionalized with CoOEP by drop-casting. The aligned and CoOEP-functionalized SWNTs were characterized with electrical (I-V method), structural, spectroscopic, and morphological techniques, and sensor performance was investigated in a chemiresistive sensing modality. The fabricated sensor shows response towards acetone, dichloromethane, methyl ethyl ketone, ethanol, and methanol, with a lower detection limit of 5 ppm, which is far below the OSHA permissible exposure limit for each analyte, and demonstrates fast response and recovery. The multivariate analysis viz. principal component analysis and linear discrimination analysis reveals high discriminating capability of SWNTs functionalized with the CoOEP chemiresistive sensor towards these analytes, which could be used as an intelligent electronic nose (E-nose). This type of intelligent E-nose can address the crucial need for monitoring environmental pollution in industries, homes, buildings, etc. Keywords Single-walled carbon nanotubes (SWNTs) • cobalt octaethyl porphyrin (CoOEP) • functionalization • principal component analysis (PCA) • linear discrimination analysis (LDA) • electronic nose (E-nose)

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Section: Introductionmentioning

confidence: 99%

Multivariate Analysis of a Cobalt Octaethyl Porphyrin-Functionalized SWNT Microsensor Device for Selective and Simultaneous Detection of Multiple Analytes

Shirsat¹,

Bodkhe

Sonawane

et al. 2021

J. Electron. Mater.

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“…The formaldehyde adsorption behaviors of SnO 2 sensors by the oxygen plasma treatment before (SnO 2 -M) and after (SnO 2 -U) were analyzed, and their models were developed and optimised based on DFT by using Viennaab initio simulation package [25]. The generalised gradient approximation of Perdew, Burke, and Ernzerhof was used for the calculations [24,25]. The cutoff energy of 400 eV was selected to expand the oneelectron wave function.…”

Section: Methodsmentioning

confidence: 99%

“…Surface and subsurface damage of a mosaic single-crystal diamond (100) substrate can be cured through plasma-assisted polishing [23]. Moreover, surface chemical and surface function modification by plasma can effectively improve the gas sensing performance of sensors [24].…”

Section: Introductionmentioning

confidence: 99%

Oxygen-plasma-assisted formaldehyde adsorption mechanism of SnO₂ electrospun fibers

Zhang

et al. 2022

Nanotechnology

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Chemisorbed oxygen acts a crucial role in the redox reaction of semiconductor gas sensors, and which is of great significance for improving gas sensing performance. In this study, an oxygen-plasma-assisted technology is presented to enhance the chemisorbed oxygen for improving the formaldehyde sensing performance of SnO2 electropun fiber. An inductively coupled plasma device was used for oxygen plasma treatment of SnO2 electrospun fibers. The surface of SnO2 electrospun fibers was bombarded with high-energy oxygen plasma for facilitating the chemisorption of electronegative oxygen molecules on the SnO2 (110) surface to obtain an oxygen-rich structure. Oxygen-plasma-assisted SnO2 electrospun fibers exhibited excellent formaldehyde sensing performance. The formaldehyde adsorption mechanism of oxygen-rich SnO2 was investigated using density functional theory. After oxygen plasma modification, the adsorption energy and the charge transfer number of formaldehyde to SnO2 were increased significantly. And an unoccupied electronic state appeared in the SnO2 band structure, which could enhance the formaldehyde adsorption ability of SnO2. The gas sensing test revealed that plasma-treated SnO2 electrospun fibers exhibited excellent gas sensing properties to formaldehyde, low operating temperature, high response sensitivity, and considerable cross-selectivity. Thus, plasma modification is a simple and effective method to improve the gas sensing performance of sensors.

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“…In previous years, an important number of studies have been devoted to the development of sensors for the electrochemical detection of some agents (e.g., pH, humidity, and bacteria) and molecules (e.g., gases, glucose, and neurotransmitters) using plasma-treated polymers. [8,9] Many such sensors were based on the plasma processing of polymer composites involving an insulating plastic, in addition to conducting components, for example, carbon nanotubes, graphene, or even, conducting polymers. [8,9] However, in recent studies, we reported a procedure to transform recycled polyethylene, for example, from food packaging, into an electrochemically responsive material by applying atmospheric (i.e., air-open) corona discharge plasma, which was subsequently used for electrochemical detection.…”

Section: Introductionmentioning

confidence: 99%

“…[8,9] Many such sensors were based on the plasma processing of polymer composites involving an insulating plastic, in addition to conducting components, for example, carbon nanotubes, graphene, or even, conducting polymers. [8,9] However, in recent studies, we reported a procedure to transform recycled polyethylene, for example, from food packaging, into an electrochemically responsive material by applying atmospheric (i.e., air-open) corona discharge plasma, which was subsequently used for electrochemical detection. [10,11] Thus, the plasma-transformed recycled plastic, which was supported by a carbon screen-printed electrode (SPE), successfully acted as a coating layer for the electrochemical detection of dopamine (DA) and glucose.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical activation for sensing of three‐dimensional‐printed poly(lactic acid) using low‐pressure plasma

Fontana‐Escartín

Lanzalaco

Pérez‐Madrigal

et al. 2022

Plasma Processes & Polymers

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Integrated electrochemical sensors in which plasma-treated poly(lactic acid) (PLA) single material acts as both selective coating layer and electrochemical transductor (electrode) are prepared. Thus, three-dimensional-printed PLA specimens are transformed into electroresponsive material by applying a low-pressure gas plasma treatment with three different gases: N 2 , O 2 , and air (79% N 2 + 21% O 2 ). Although all treated samples are able to electrochemically detect dopamine, the one derived from the treatment of lowpressure O 2 plasma exhibits the best performance as a sensor. Finally, cell adhesion assays demonstrate that the cell viability is higher for plasma-treated PLA modified than for pristine PLA, making the former a promising, versatile, and powerful electroresponsive platform for diverse applications in biomedicine.

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Improving sensing properties of entangled carbon nanotube-based gas sensors by atmospheric plasma surface treatment

Cited by 16 publications

References 40 publications

Multivariate Analysis of a Cobalt Octaethyl Porphyrin-Functionalized SWNT Microsensor Device for Selective and Simultaneous Detection of Multiple Analytes

Multivariate Analysis of a Cobalt Octaethyl Porphyrin-Functionalized SWNT Microsensor Device for Selective and Simultaneous Detection of Multiple Analytes

Oxygen-plasma-assisted formaldehyde adsorption mechanism of SnO₂ electrospun fibers

Electrochemical activation for sensing of three‐dimensional‐printed poly(lactic acid) using low‐pressure plasma

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Improving sensing properties of entangled carbon nanotube-based gas sensors by atmospheric plasma surface treatment

Cited by 16 publications

References 40 publications

Multivariate Analysis of a Cobalt Octaethyl Porphyrin-Functionalized SWNT Microsensor Device for Selective and Simultaneous Detection of Multiple Analytes

Multivariate Analysis of a Cobalt Octaethyl Porphyrin-Functionalized SWNT Microsensor Device for Selective and Simultaneous Detection of Multiple Analytes

Oxygen-plasma-assisted formaldehyde adsorption mechanism of SnO2 electrospun fibers

Electrochemical activation for sensing of three‐dimensional‐printed poly(lactic acid) using low‐pressure plasma

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Oxygen-plasma-assisted formaldehyde adsorption mechanism of SnO₂ electrospun fibers