Electrical conductivity and Vickers hardness enhancement by pristine and functionalized MWCNTs incorporation in polycaprolactam matrix

Contreras-Navarrete, J. J.; Ambriz-Torres, J. M.; Gutiérrez-García, Carmen Judith; Granados-Martínez, Francisco Gabriel; Flores-Ramírez, Nelly; Vásquez-García, S. R.; Mondragón-Sánchez, M. L.; García-González, L.; Zamora‐Peredo, L.; Domratcheva‐Lvova, Lada

doi:10.1007/s10854-018-9302-y

Cited by 6 publications

(3 citation statements)

References 43 publications

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“…Pyrolysis of materials at different temperatures changes the final structure of the catalyst layer and also leads to a different pore structures. [50][51][52] The BET surface area of a catalyst pyrolysed at 800 °C is twice that of a catalyst prepared at 600 °C, and the surface area of a catalyst pyrolysed at 1000 °C is three times more than that of 600 °C.…”

Section: Resultsmentioning

confidence: 99%

Lead and Nitrogen Co-Doped Multi-Walled Carbon Nanotube Electrocatalyst for Oxygen Reduction Reaction

Zarmehri,

Raudsepp,

Šmits

et al. 2023

J. Electrochem. Soc.

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The electrocatalysis of oxygen reduction reaction (ORR) on lead and nitrogen co-doped multi-walled carbon nanotube (Pb/N/MWCNT) composite catalyst has been investigated in the neutral, acidic and alkaline media. The mixture of lead phthalocyanine (PbPc) and MWCNTs was pyrolysed in nitrogen atmosphere to achieve co-doping of lead and nitrogen. The successful co-doping as well as formation of Pb nanoparticles were confirmed with the use of various physical and surface characterisation methods such as scanning and transmission electron microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy and X-ray diffraction analysis. This work brings forth the electrocatalytic effect of Pb and nitrogen co-doping of carbon by a detailed electrochemical analysis using rotating disk electrode (RDE) method. The Pb and nitrogen co-doped MWCNT material demonstrate a reasonable electrocatalytic ORR activity in acidic, neutral and alkaline media. The results indicate great potential of Pb to be employed in electrocatalyst design as co-doping agent to achieve superior cathode catalysts for microbial, proton and anion exchange membrane fuel cells.

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Section: Resultsmentioning

confidence: 99%

Lead and Nitrogen Co-Doped Multi-Walled Carbon Nanotube Electrocatalyst for Oxygen Reduction Reaction

Zarmehri,

Raudsepp,

Šmits

et al. 2023

J. Electrochem. Soc.

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“…Silica gel/MWCNT composites were prepared by adding MWCNTs to silica gel using the mechanical dispersion method [19]. The samples were prepared with different fractions of nanoparticles, corresponding to 0.25% (SG-1CNT), 0.5% (SG-2CNT), and 0.75% (SG-3CNT) by mass (Table 2).…”

Section: Preparation Of Sg With Mwcnts Using Mechanical Dispersionmentioning

confidence: 99%

Morphological: Optical, and Mechanical Characterizations of Non-Activated and Activated Nanocomposites of SG and MWCNTs

et al. 2021

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Nanocomposites of silica gel (SG) and multiwalled carbon nanotubes (MWCNTs) of relatively low concentrations (0.25, 0.50, and 0.75 wt%) were characterized before and after annealing. Adsorption is a surface phenomenon, and based on this, the morphology of the composites was investigated by scanning electron microscopy (SEM). The produced images show that the MWCNTs were embedded into the silica gel base material. Fourier transform infrared (FTIR) transmittance spectroscopy showed that MWCNTs were not functionalized within the matrix of silica gel and MWCNT composites. However, after annealing the composites at 400 °C for 4 h in air, evidence of activation was observed in the FTIR spectrum. The effects of the embedding of MWCNTs on porosity, specific surface area, and pore size distribution were studied using Raman spectroscopy. The Raman spectra of the prepared composites were mainly dominated by characteristic sharp scattering peaks of the silica gel at 480, 780, and 990 cm−1 and a broad band centered at 2100 cm−1. The scattering peaks of MWCNTs were not well pronounced, as the homogeneity of the composite is always questionable. Nanosizer analysis showed that at 0.25 wt%, the distribution of MWCNTs within the silica gel was optimal. Vickers hardness measurements showed that the hardness increased with the increasing weight percent of MWCNTs within the composite matrix, while annealing enhanced the mechanical properties of the composites. Further studies are required to investigate the pore structure of silica gel within the matrix of MWCNTs to be deployed for efficient cooling and water purification applications.

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“…Comparison of the pH performance for the SEs based on MWCNTs sprayed onto a planar Si and a KOHetched Si substrate with different times is also made. In addition, the influence of the thermal oxidation conditions of MWCNTs on the crystal structures [37][38][39] in increasing the active sites for the adsorption of H + and OHions and the pH sensitivity is also investigated and discussed. Then, SEs with stacks of HTG NiO NSs to further increase the amount of ion adsorption sites and improve pH sensing performance are demonstrated and discussed.…”

Section: Introductionmentioning

confidence: 99%

The use of a multiple roughening scheme to enhance sensing performance of pH sensors with NiO nanosheets/multi-walled carbon nanotubes on KOH-etched Si substrates

Chang¹,

Wang²,

Ko³

et al. 2021

Jpn. J. Appl. Phys.

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Sensing electrodes (SEs) fabricated by a multiple surface roughening scheme based on KOH-etched Si substrates with spraying deposited multi-walled carbon nanotubes (MWCNTs) and hydrothermally grown (HTG) NiO nanosheets (NSs) to improve pH sensing performance are demonstrated. A surface area (SA) gain of around 2.31 is obtained from the etched Si substrate, which results in an enhancement in the pH sensitivity of MWCNTs SEs from 52.15 to 54.95 mV pH−1 based on Si substrates without and with KOH etching. Effects of the thermal annealing temperatures and spraying times of the MWCNTs and HTG times of NiO NSs of the proposed NiO NSs/MWCNTs/pyramid-Si SEs on pH sensitivity, hysteresis, and reliability are studied. A near-Nernstian response of 57.56 mV pH−1 is obtained, which could be attributed to the proposed method maximize SA and the number of ion adsorption sites for advancing pH sensing performance.

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Electrical conductivity and Vickers hardness enhancement by pristine and functionalized MWCNTs incorporation in polycaprolactam matrix

Cited by 6 publications

References 43 publications

Lead and Nitrogen Co-Doped Multi-Walled Carbon Nanotube Electrocatalyst for Oxygen Reduction Reaction

Lead and Nitrogen Co-Doped Multi-Walled Carbon Nanotube Electrocatalyst for Oxygen Reduction Reaction

Morphological: Optical, and Mechanical Characterizations of Non-Activated and Activated Nanocomposites of SG and MWCNTs

The use of a multiple roughening scheme to enhance sensing performance of pH sensors with NiO nanosheets/multi-walled carbon nanotubes on KOH-etched Si substrates

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