Poly(methyl methacrylate) and thiophene-coated single-walled carbon nanotubes for volatile organic compound discrimination

Muangrat, Worawut; Chodjarusawad, Thanawee; Maolanon, Rungroj; Pratontep, Sirapat; Porntheeraphat, Supanit; Wongwiriyapan, Winadda

doi:10.7567/jjap.55.02bd04

Cited by 11 publications

(3 citation statements)

References 33 publications

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“…A hypothesis based on polymer swelling can be described as follows. After VOC adsorption, polymer coatings on graphene is swollen, thus possibly increasing the polymer volume and bending of graphene sheet, resulting in an increase in electrical resistance [9]. The higher solubility, the larger magnitude of sensor response.…”

Section: Resultsmentioning

confidence: 99%

Graphene and Poly (Methyl Methacrylate) Composite Laminates on Flexible Substrates for Volatile Organic Compounds Detection

Rattanabut¹

2017

Extended Abstracts of the 2017 International Conference on Solid State Devices and Materials

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In this study, graphene and poly(methyl methacrylate) (GR/PMMA) composite laminates on flexible substrates were fabricated for the use in volatile organic compounds detection. The CVD-grown graphene on Cu foil was transferred on polyethylene terephthalate (PET) substrate by PMMA-assisted wet transfer process. Without PMMA removal, the GR/PMMA composite laminates on PET were obtained. Graphene and GR/PMMA sensors show completely different sensor response to VOC vapors. The resistance of graphene sensor decreases, while that of GR/PMMA increases upon VOC exposure. The graphene and GR/PMMA sensors show the highest magnitude of sensor response to dichloromethane. The sensor response of the GR/PMMA to acetone, chloroform and benzene are greatly suppressed, resulting in the selectivity improvement. The sensor response of graphene can be explained in terms of the dielectric constant of VOCs and electron hopping effects on defect graphene, while that of the GR/PMMA would be attributed to swelling mechanism.

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Section: Resultsmentioning

confidence: 99%

Graphene and Poly (Methyl Methacrylate) Composite Laminates on Flexible Substrates for Volatile Organic Compounds Detection

Rattanabut¹

2017

Extended Abstracts of the 2017 International Conference on Solid State Devices and Materials

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“…The solvent polarity of ethanol is higher than that of acetone [23]. The molecule with higher polarity can hold moving holes and interrupt the movement of holes along CNTs, resulting in a large increase in resistance [24][25][26]. For NH 4 OH detection, sensing mechanism is attribute to the charge transfer between NH 4 OH molecule and N-DWCNTs.…”

Section: Figure 2(a)mentioning

confidence: 99%

Enhancement Sensitivity and Selectivity of Ammonium Hydroxide Using Nitrogen-Doped Double-Walled Carbon Nanotubes

2022

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Nitrogen-doped double-walled carbon nanotubes (N-DWCNTs) were synthesized by floating catalytic chemical vapor deposition (FCCVD) at 1300 °C using ethanol and urea as carbon and nitrogen sources. For comparison, the undoped double-walled carbon nanotubes (DWCNTs) were synthesized by FCCVD using ethanol as carbon source. Synthesized DWCNTs and N-DWCNTs were separately dispersed in ethanol and separately dropped onto printed circuit board substrate. The fabricated sensors were detected to ammonium hydroxide (NH4OH), acetone and ethanol vapors at part per million level. The sensor response results show that N-DWCNTs are highly sensitive to NH4OH. In the case of volatile organic compounds detection, DWCNTs and N-DWCNTs exhibit similar response to acetone and ethanol. The fabricated sensor from N-DWCNTs to NH4OH vapor was 4-fold higher than that of fabricated sensor from undoped DWCNTs. The sensing mechanism of N-DWCNTs can be attributed to the charge transfer between N-DWCNTs and NH4OH molecule. Nitrogen site has a higher response, resulting in an enhancement the selectivity and sensitivity to NH4OH. The total atomic percentage of N-DWCNTs is approximately 0.90 at%. The results suggest that the heteroatom-doping of nitrogen is a promising approach for improving the sensitivity and selectivity for NH4OH detection. HIGHLIGHTS N-DWCNTs were synthesized by FCCVD method using ethanol and urea Nitrogen site in N-DWCNTs is highly sensitive and selective to NH4OH N-DWCNTs enabled 4-fold improved NH4OH compared with undoped DWCNTs GRAPHICAL ABSTRACT

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“…31,32) For the GR=PMMA sensor, the main sensing mechanism can be described in terms of polymer swelling due to VOC adsorption and the Hansen solubility parameter (HSP) similarly to polymer-coated carbon nanotubes. 33,34) A hypothesis based on polymer swelling can be described as follows. After VOC adsorption, PMMA on graphene layer becomes swollen, resulting in an increase in electrical resistance due to the increase in polymer volume and graphene sheet bending.…”

Section: Sensing Mechanism Of Graphene and Gr/pmma Sensormentioning

confidence: 99%

Graphene and poly(methyl methacrylate) composite laminates on flexible substrates for volatile organic compound detection

Rattanabut

Wongwiriyapan

Muangrat

et al. 2018

Jpn. J. Appl. Phys.

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In this paper, we present a gas sensor for volatile organic compound (VOC) detection based on graphene and poly(methyl methacrylate) (GR/PMMA) composite laminates fabricated using CVD-grown graphene. Graphene was transferred to a poly(ethylene terephthalate) (PET) substrate by PMMA-supported wet transfer process without PMMA removal in order to achieve the deposition of GR/PMMA composite laminates on PET. The GR/PMMA and graphene sensors show completely different sensitivities to VOC vapors. The GR/PMMA and graphene sensors showed the highest sensitivities to dichloromethane (DCM). The response of the GR/PMMA sensor to DCM was 3 times higher than that of the graphene sensor but the GR/PMMA sensor hardly responded to acetone, chloroform, or benzene. The sensing mechanism of the graphene sensor can be based on the dielectric constant of VOCs, the size of VOC molecule, and electron hopping effects on defect graphene, while that of the GR/PMMA sensor can be explained in terms of the polymer swelling owing to the Hansen solubility parameter.

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Poly(methyl methacrylate) and thiophene-coated single-walled carbon nanotubes for volatile organic compound discrimination

Cited by 11 publications

References 33 publications

Graphene and Poly (Methyl Methacrylate) Composite Laminates on Flexible Substrates for Volatile Organic Compounds Detection

Graphene and Poly (Methyl Methacrylate) Composite Laminates on Flexible Substrates for Volatile Organic Compounds Detection

Enhancement Sensitivity and Selectivity of Ammonium Hydroxide Using Nitrogen-Doped Double-Walled Carbon Nanotubes

Graphene and poly(methyl methacrylate) composite laminates on flexible substrates for volatile organic compound detection

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