Synthesis of chain-like carbon nano-onions by a flame assisted pyrolysis technique using different collecting plates

Mongwe, Thomas H.; Matsoso, Boitumelo J.; Mutuma, Bridget K.; Coville, Neil J.; Maubane, Manoko S.

doi:10.1016/j.diamond.2018.10.002

Cited by 34 publications

(32 citation statements)

References 66 publications

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“…Figure 3 shows the CNPs are agglomerated, with an average diameter determined to be 30-40 nm (see Fig. 3c) The presence of graphitic characteristics of the CNPs is consistent with the result from Powder X-ray diffractions, similar results were reported [39]. Moreover, agglomeration of nanoparticles between adjacent nanoparticles because of van der Waals interaction.…”

Section: Transmission Electron Microscopy (Tem) Analysissupporting

confidence: 86%

Application of functionalised MXene-carbon nanoparticle-polymer composites in resistive hydrostatic pressure sensors

Seroka

Mamo

2020

SN Appl. Sci.

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The synthesised and functionalised materials were characterised using TEM, SEM, Raman and P-XRD. The characterisation techniques confirmed that a successful functionalisation of Ti 3 AlC 2 , the synthesised and functional groups on the carbon nanoparticles. The TEM and SEM were also used to study the surface morphology of the materials. The pressure sensor was fabricated by depositing the polymer composites on the IDE and different types of pressure sensors were prepared by varying the sensing materials in the composites. Generally, the fabricated sensors, based on the two polymers, Ppy and PVP polymer, have shown a linear relationship between the applied pressure and the relative resistance response in their respective ranges. The best sensitive sensors were f-MC/Ppy bases sensor 0.00232 kPa −1 in a range from 126 to 168 kPa, in a very wide range, 68-168 kPa, the sensitivity of the f-MC/CNPs based sensor was 0.00017 kPa −1. The sensors recoveries and responses time were also studied and all the sensors based on Ppy polymer responded very fast as compare to PVP based sensors, they responded just in one second and the recovery time was between 3 and 5 s. The PVP based sensors found slower to respond and recover as compare to the Ppy based sensors.

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Section: Transmission Electron Microscopy (Tem) Analysissupporting

confidence: 86%

Application of functionalised MXene-carbon nanoparticle-polymer composites in resistive hydrostatic pressure sensors

Seroka

Mamo

2020

SN Appl. Sci.

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“…The observed morphology from the SEM micrographs was similar to that found in our previously work. 53 SEM micrographs of the doped CNOs (i.e. a 1 CNOs, a 1.5 CNOs and a 2 CNOs) showed similar conglomerated quasi-spherical morphology without structural deformations or distortions (see Figure S1).…”

Section: Structural Morphology Analysis Of the Cnosmentioning

confidence: 98%

“…Similar results were obtained in our previous work in which the growth process known as the "snow ball" accretion process was discussed. 53,57,58 . In addition, these results are also comparable to those obtained by Mohapatra et al, and Reddy et al 35,59 The nitrogen-doped CNOs (N-CNOs) showed similar shapes as compared to the pCNOs.…”

Section: Structural Morphology Analysis Of the Cnosmentioning

confidence: 99%

The use of ex-situ nitrogen-doped olive oil-derived carbon nano-onions for application in chemi-resistive gas sensors to detect acetone at room temperature

et al. 2022

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This study reports on the synthesis of carbon nano-onions (CNOs; ca. d ≤ 55 nm) and nitrogen-doped CNOs (N-CNOs) using a facile pyrolysis method and ex-situ doping of the CNOs. Elemental analysis of the N-CNOs revealed that their nitrogen content depended on the ammonia flow rate. Analysis of the N-CNOs revealed that they all exhibited structural defects. After the successful synthesis of CNOs and N-CNOs, polyvinylpyrrolidone (PVP):CNOs/N-CNOs:MnO2-nanorods (MONRs) composites were prepared and used as active sensing materials. In every case, the PVP polymer was used to stabilize the MONRs for acetone detection at 25 °C. The chemi-resistive gas sensors that showed the highest acetone sensitivity (pS = 2.0 × 10−4 ppm−1 ) was fabricated using a pristine CNOs (pCNOs) based composite. However, the N-CNOs based sensor (a1.5S) presented the lowest acetone limit of detection (LoD) at 1.2 ppm. The study implicated the effect of the nitrogen and oxygen content of the CNOs surfaces on the acetone detection. Thus, a higher sensitivity with lower LoD was observed at room temperature using the pCNOs based sensor, when compared to earlier literature reports.

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“… 45,47 The process of flame assisted pyrolysis of ghee oil to synthesize CNOs was believed to follow bottom-up mechanism that ghee oil decomposed and generated chemically reactive radicals (like –C 2 H 3 ), hydrogen atoms or sp 2 carbon creating aromatic rings and curved polycyclic aromatic hydrocarbons. 46 Arc discharge technology is a traditional route to synthesize fullerene-like materials and could be achieved in liquid nitrogen or organic solvent without offering vacuum system additionally according to Sano group. 47,58 The sample produced by submerged arc in liquid nitrogen with Ni-contained graphite anode would resulted in carbon nano-capsule with the core of Ni particle.…”

Section: Synthesis Of Cnosmentioning

confidence: 99%

Soft-chemistry synthesis, solubility and interlayer spacing of carbon nano-onions

et al. 2021

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Synthesis of chain-like carbon nano-onions by a flame assisted pyrolysis technique using different collecting plates

Cited by 34 publications

References 66 publications

Application of functionalised MXene-carbon nanoparticle-polymer composites in resistive hydrostatic pressure sensors

Application of functionalised MXene-carbon nanoparticle-polymer composites in resistive hydrostatic pressure sensors

The use of ex-situ nitrogen-doped olive oil-derived carbon nano-onions for application in chemi-resistive gas sensors to detect acetone at room temperature

Soft-chemistry synthesis, solubility and interlayer spacing of carbon nano-onions

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