n-Type gas sensing characteristics of chemically modified multi-walled carbon nanotubes and PMMA composite

Li, Yang; Wang, Huicai; Yang, Mujie

doi:10.1016/j.snb.2006.04.074

Cited by 41 publications

(25 citation statements)

References 23 publications

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“…shielding materials [7][8][9], transparent conducting films [10][11][12], gas sensors [13,14], etc. In addition, functionalization of CNT can significantly enhance the thermal and mechanical properties of PMMA [15][16][17][18].…”

Section: Pmma/cnt Composites Can Found Application As Electromagneticmentioning

confidence: 99%

Highly conducting poly(methyl methacrylate)/carbon nanotubes composites: Investigation on their thermal, dynamic-mechanical, electrical and dielectric properties

Logakis

Pandis

Pissis

et al. 2011

Composites Science and Technology

152

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To cite this version:E. Logakis, Ch. Pandis, P. Pissis, J. Pionteck, P. Pötschke. Highly conducting poly(methyl methacrylate) / carbon nanotubes composites: Investigation on their thermal, dynamic-mechanical, electrical and dielectric properties. Composites Science and Technology, Elsevier, 2011, 71 (6) This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractNanocomposites of poly(methyl methacrylate) (PMMA) containing various multi-walled carbon nanotubes (MWCNT) contents were prepared using melt mixing. Several techniques were employed to study the influence of the MWCNT addition on the thermal, mechanical, electrical and dielectric properties of the PMMA matrix. The electrical percolation threshold (p c ) was found to be 0.5 vol.% by performing AC and DC conductivity measurements. Significantly high conductivity levels (σ dc ) were achieved: σ dc exceeds 10 -2 S/cm already at 1.1 vol.%, the criterion for EMI shielding (σ dc > 10 -1 S/cm) is fulfilled at 2.9 vol.%, and the highest loaded sample (5.2 vol.%) gave a maximum value of 0.5 S/cm. Dielectric relaxation spectroscopy measurements in broad frequency (10 -1 −10 6 Hz) and temperature ranges (-150 to 170 ºC) indicated weak polymer-filler interactions, in consistency with differential scanning calorimetry and dynamic mechanical analysis findings. Weak polymer-filler interactions and absence of crystallinity facilitate the achievement of high conductivity levels in the nanocomposites.

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Section: Pmma/cnt Composites Can Found Application As Electromagneticmentioning

confidence: 99%

Highly conducting poly(methyl methacrylate)/carbon nanotubes composites: Investigation on their thermal, dynamic-mechanical, electrical and dielectric properties

Logakis

Pandis

Pissis

et al. 2011

Composites Science and Technology

152

View full text Add to dashboard Cite

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“…Amongst them, PMMA is of special interest due to its high optical clarity, amorphous nature, and biocompatibility. PMMA/CNT nanocomposites can be used in various fields, such as, electromagnetic interference (EMI) shielding materials, transparent conducting films, gas sensors, etc. Considerable research has already been carried out on the electrical properties of PMMA/CNT nanocomposites prepared through different methods .…”

Section: Introductionmentioning

confidence: 99%

Sequential mixing as effective method in the reduction of percolation threshold of multiwall carbon nanotube in poly(methyl methacrylate)/high‐density poly(ethylene)/MWCNT nanocomposites

Patra

Suin

Mandal

et al. 2013

J of Applied Polymer Sci

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This work demonstrates sequential heating protocol to be an effective method in the reduction of percolation threshold of multiwall carbon nanotube (MWCNT) in (70/30 w/w) poly(methyl methacrylate) (PMMA)/high‐density poly(ethylene) (HDPE)/MWCNT nanocomposites. Here, the percolation threshold (Pc) value was reduced to 0.08 wt % of MWCNT, which is the lowest among the ever reported values of Pc for the PMMA system. Moreover, a co‐continuous morphology of the minor HDPE phase was evident throughout the major PMMA phase in a highly asymmetric composition (70/30 w/w) of the blend constituents. The AC conductivity as well as the dielectric permittivity values were increased with increase in loading of MWCNT in the nanocomposites. The detailed analysis of electrical and morphological properties is discussed in depth in the article. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40235.

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“…Several works also mention the use of carbon nanotube-based sensors for the detection of ammonia [17][18][19], but CNTs without functionalization have poor chemical selectivity [20] and the resulting conducting architecture tends to have a poor structural stability when assembled without any binder or matrix [21]. This is why several researchers have experimented the functionalization of CNT by insulating polymers, like PMMA [22] chitosan [23], poly(lactic acid) PLA [24], or intrinsically-conducting polymers (ICP), like poly(pyrrole) (PPy) [25][26][27], poly(thiophene) (PEDOT) [27,28], or poly(aniline) (PANI) [27,28], which can lead to a positive synergy. However, it seems that reaching the ppb range of detection makes the use of nanostructured transducers compulsory, as only the few works using this strategy report such a high sensitivity.…”

Section: Introductionmentioning

confidence: 99%

vQRS Based on Hybrids of CNT with PMMA-POSS and PS-POSS Copolymers to Reach the Sub-PPM Detection of Ammonia and Formaldehyde at Room Temperature Despite Moisture

Sachan¹,

Castro

Choudhary³

et al. 2017

Chemosensors

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Nanocomposite-based quantum resistive vapour sensors (vQRS) have been developed from the assembly of hybrid copolymers of polyhedral oligomeric silsesquioxane (POSS) and poly(methyl methacrylate) (PMMA) or poly(styrene) (PS) with carbon nanotubes (CNT). The originality of the resulting conducting architecture is expected to be responsible for the ability of the transducer to detect sub-ppm concentrations of ammonia and formaldehyde at room temperature despite the presence of humidity. In particular, the boosting effect of POSS is evidenced in CNT-based nanocomposite vQRS. The additive fabrication by spraying layer-by-layer provides (sLbL) is an effective method to control the reproducibility of the transducers' chemo-resistive responses. In dry atmosphere, the two types of sensors showed a high sensitivity towards both hazardous gases, as they were able to detect 300 ppb of formaldehyde and 500 ppb of ammonia with a sufficiently good signal to noise ratio (SNR > 10). They also exhibited a quick response times less than 5 s for both vapours and, even in the presence of 100 ppm of water, they were able to detect small amounts of gases (1.5 ppm of NH 3 and 9 ppm of CH 2 O). The results suggest promising applications of POSS-based vQRS for air quality or volatolome monitoring.

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n-Type gas sensing characteristics of chemically modified multi-walled carbon nanotubes and PMMA composite

Cited by 41 publications

References 23 publications

Highly conducting poly(methyl methacrylate)/carbon nanotubes composites: Investigation on their thermal, dynamic-mechanical, electrical and dielectric properties

Highly conducting poly(methyl methacrylate)/carbon nanotubes composites: Investigation on their thermal, dynamic-mechanical, electrical and dielectric properties

Sequential mixing as effective method in the reduction of percolation threshold of multiwall carbon nanotube in poly(methyl methacrylate)/high‐density poly(ethylene)/MWCNT nanocomposites

vQRS Based on Hybrids of CNT with PMMA-POSS and PS-POSS Copolymers to Reach the Sub-PPM Detection of Ammonia and Formaldehyde at Room Temperature Despite Moisture

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