Selective volatile organic compound gas sensor based on carbon nanotubes functionalized with ZnO nanoparticles

Xiang, Jiaxi; Singhal, Anuj; Divan, Ralu; Stan, Liliana; Liu, Yuzi; Paprotny, Igor

doi:10.1116/6.0000992

Cited by 6 publications

(5 citation statements)

References 56 publications

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“…The LOD of PVP-coated N-DWCNTs was 15 ppm. Although the LOD of PVP-coated N-DWCNTs sensor was much higher compared with previous reports [ 12 , 13 , 14 , 15 ], PVP-coated N-DWCNTs sensor can be used down to ppm-level formaldehyde detection at room temperature. The experimental study of pristine CNTs and their functionalization or composite materials for formaldehyde detection is summarized in Table S1 (Supplementary Materials) .…”

Section: Introductionmentioning

confidence: 66%

“…However, pristine CNTs are still insensitive to formaldehyde. Efforts have been made to develop the surface modification and nanocomposites of CNTs with metal oxides for improving formaldehyde detection [ 12 , 13 , 14 , 15 ]. For example, Wang et al [ 13 ] fabricated tin oxide-doped with hydroxyl functionalized MWCNTs (MWCNTs-doped SnO 2 ) for formaldehyde detection at approximately 125 to 375 °C.…”

Section: Introductionmentioning

confidence: 99%

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Highly Sensitive and Selective Formaldehyde Gas Sensors Based on Polyvinylpyrrolidone/Nitrogen-Doped Double-Walled Carbon Nanotubes

Chobsilp

Threrujirapapong

Yordsri

et al. 2022

Sensors

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A highly sensitive and selective formaldehyde sensor was successfully fabricated using hybrid materials of nitrogen-doped double-walled carbon nanotubes (N-DWCNTs) and polyvinylpyrrolidone (PVP). Double-walled carbon nanotubes (DWCNTs) and N-DWCNTs were produced by high-vacuum chemical vapor deposition using ethanol and benzylamine, respectively. Purified DWCNTs and N-DWCNTs were dropped separately onto the sensing substrate. PVP was then dropped onto pre-dropped DWCNT and N-DWCNTs (hereafter referred to as PVP/DWCNTs and PVP/N-DWCNTs, respectively). As-fabricated sensors were used to find 1,2-dichloroethane, dichloromethane, formaldehyde and toluene vapors in parts per million (ppm) at room temperature for detection measurement. The sensor response of N-DWCNTs, PVP/DWCNTs and PVP/N-DWCNTs sensors show a high response to formaldehyde but a low response to 1,2-dichloroethane, dichloromethane and toluene. Remarkably, PVP/N-DWCNTs sensors respond sensitively and selectively towards formaldehyde vapor, which is 15 times higher than when using DWCNTs sensors. This improvement could be attributed to the synergistic effect of the polymer swelling and nitrogen-sites in the N-DWCNTs. The limit of detection (LOD) of PVP/N-DWCNTs was 15 ppm, which is 34-fold higher than when using DWCNTs with a LOD of 506 ppm. This study demonstrated the high sensitivity and selectivity for formaldehyde-sensing applications of high-performance PVP/N-DWCNTs hybrid materials.

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Section: Introductionmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Highly Sensitive and Selective Formaldehyde Gas Sensors Based on Polyvinylpyrrolidone/Nitrogen-Doped Double-Walled Carbon Nanotubes

Chobsilp

Threrujirapapong

Yordsri

et al. 2022

Sensors

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“…This technique is only applicable for combustible gases at lower explosion limits (LEL) as it relies on their combustion, limiting widespread use. Researchers have reported 2D material-based gas sensors [10], [11]. These sensors can exhibit structural defects and material decay which adversely impact their reliability.…”

Section: Introductionmentioning

confidence: 99%

2-Photon Polymerized IP-Dip 3D Photonic Crystals for Mid IR Spectroscopic Applications

Singhal

Dalmiya

Lynch

et al. 2023

IEEE Photon. Technol. Lett.

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Photonic Crystals (PhC) are periodically structured dielectric materials that have been subject to extensive research efforts over the last two decades. PhC are known for the slow-light phenomenon, which increases the interaction time between light and the target gas, thereby enhancing sensitivity when applied to sensors. Slow light is best realized using three-dimensional (3D) PhC with a complete photonic band-gap (PBG). However, they are inherently difficult to fabricate with planar microfabrication techniques. In this work, we present two-photon polymerized (2PP) stereolithographically fabricated 3D PhC targeting midinfrared (MIR) spectroscopic range. Finite Element Analysis (FEA) was performed on a two-dimensional (2D) PhC waveguide (PhCW) to analyze the significance of PBG and slow light properties. Additional FEA was conducted and validated experimentally using fabricated 3D PhC. The ability to tune PhC to a desired wavelength along with their repeatability and feasibility is experimentally demonstrated. This paper presents the first, to our knowledge, 3D PhC fabricated using 2PP stereolithography operating at this wavelength.

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“…The reinforcement of ZnO with CNT has developed advanced multifunctional gas sensors with improved properties. Many reports show that the CNT-ZnO composite is a better gas sensor as compared to bare ZnO and CNT [22][23][24]. So far, the effect of the different morphological structures of the zinc oxide microstructure in ZnO hybrid compounds has not been investigated.…”

Section: Introductionmentioning

confidence: 99%

Investigating Organic Vapor Sensing Properties of Composite Carbon Nanotube-Zinc Oxide Nanowire

et al. 2022

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The low operating temperature of nanowire gas sensors along with their high surface-to-volume ratio are two factors that make gas sensors more practical. In this paper, the growth of ZnO nanowires on a vertically aligned CNT forest is reported. The utilized method for ZnO growth was a rapid microwave-assisted hydrothermal route, which facilitates low-temperature and ultra-fast fabrication. Organic vapor sensing properties of fabricated samples were studied in response to different alcoholic vapors at a wide operating temperature range of 25 to 300 °C. Enhancement of the gas response was observed with increasing operating temperature. Moreover, the effect of the ZnO nanowire length on organic vapor sensing properties of CNT-ZnO samples was investigated. Results proved that CNT-ZnO samples with long ZnO wires exhibit higher sensitivity to examined analytes. Different length ZnO nanowires were attained via variation of the microwave exposure time and power. Fabrication parameters were selected based on numerous runs. The length of ZnO synthesized at each distinct run was calculated based on SEM micrographs of the samples.

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Selective volatile organic compound gas sensor based on carbon nanotubes functionalized with ZnO nanoparticles

Cited by 6 publications

References 56 publications

Highly Sensitive and Selective Formaldehyde Gas Sensors Based on Polyvinylpyrrolidone/Nitrogen-Doped Double-Walled Carbon Nanotubes

Highly Sensitive and Selective Formaldehyde Gas Sensors Based on Polyvinylpyrrolidone/Nitrogen-Doped Double-Walled Carbon Nanotubes

2-Photon Polymerized IP-Dip 3D Photonic Crystals for Mid IR Spectroscopic Applications

Investigating Organic Vapor Sensing Properties of Composite Carbon Nanotube-Zinc Oxide Nanowire

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