Size-selected polyynes synthesised by submerged arc discharge in water

Peggiani, Sonia; Senis, Andrea; Facibeni, Anna; Milani, Alberto; Serafini, Patrick; Cerrato, Gianmarco; Lucotti, Andrea; Tommasini, Matteo; Fazzi, Daniele; Castiglioni, Chiara; Russo, Valeria; Bassi, Andrea; Casari, Carlo Spartaco

doi:10.1016/j.cplett.2019.137054

Cited by 16 publications

(17 citation statements)

References 44 publications

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“…the number of carbon atoms) ranging from 6 to 10 in agreement with previous studies. 19,45,46 Longer polyynes may be present but are hardly detectable due to their low concentration, which results in a weak signal also partially covered by the PVA peak. In fact, for PVA concentration exceeding 0.5 wt%, the strong PVA peak makes it difficult to identify the presence of polyyne.…”

Section: Resultsmentioning

confidence: 99%

“…After 3 weeks, the decomposition of polyynes in Ag/PVA solution, evaluated considering the integrated area of the SERS signal in sp-carbon range, is about 60%, which is anyway strongly reduced with respect to the case of polyynes in the aqueous Ag colloid, whose area decrease after 3 weeks is 95% (as reported in ref. 19). In the spectra of solid nanocomposites, we observe after 1 week a decrease of the intensity of the polyynic SERS bands of the order of 50% but then, the spectrum does not substantially change up to 11 months.…”

Section: Materials Advances Papermentioning

confidence: 99%

“…[16][17][18] However, the use of water in SADL was recently shown to achieve polyynes of up to 16 carbon atoms or to obtain polyynes by collecting and condensing the gas generated by arc discharge. 19,20 To fully take advantage of the properties of polyynes, the availability of a stable material under ambient conditions is required. The stability of sp-carbon atomic chains is not a trivial issue.…”

Section: Introductionmentioning

confidence: 99%

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In situ synthesis of polyynes in a polymer matrix via pulsed laser ablation in a liquid

et al. 2020

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Section: Resultsmentioning

confidence: 99%

Section: Materials Advances Papermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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In situ synthesis of polyynes in a polymer matrix via pulsed laser ablation in a liquid

et al. 2020

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“…Time Dependent Density Functional Theory (TD-DFT) calculations were carried for the prediction of the vibronic spectra at CAM-B3LYP/cc-pVTZ level of theory, while PBE0/cc-pVTZ calculations have been used for the computation of the Raman spectra. Based on TD-DFT calculations, Huang-Rys factors and vibronic spectra have been computed by home-made programs 32,33 . The computed vibrational frequencies were multiplied by a scale factor of 0.961 in the comparison with experimental spectra 34 .…”

Section: Methodsmentioning

confidence: 99%

Solvent-dependent termination, size and stability in polyynes synthesis by laser ablation in liquids

Peggiani,

Marabotti,

Lotti

et al. 2020

Preprint

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In recent years there has been a growing interest in sp-carbon chains as possible novel nanostructures. An example of sp-carbon chains are the so-called polyynes, characterized by the alternation of single and triple bonds that can be synthesized by pulsed laser ablation in liquid (PLAL) of a graphite target. In this work, by exploiting different solvents in the PLAL process, e.g. water, acetonitrile, methanol, ethanol, and isopropanol, we systematically investigate the solvent role in polyyne formation and stability. The presence of methyland cyano-groups in the solutions influences the termination of polyynes, allowing to detect, in addition to hydrogen-capped polyynes up to HC 22 H, methyl-capped polyynes up to 18 carbon atoms (i.e. HC n CH 3 ) and cyanopolyynes up to HC 12 CN. The assignment of each species was done by UV-Vis spectroscopy and supported by density functional theory simulations of vibronic spectra. In addition, surface-enhanced Raman spectroscopy allowed to observe differences, due to different terminations (hydrogen, methyl-and cyano group), in the shape and positions of the characteristic Raman bands of the size-selected polyynes. The evolution in time of each polyyne has been investigated evaluating the chromatographic peak area, and the effect of size, terminations and solvents on polyynes stability has been individuated.

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“…The other compound containing iron with magnetic properties is the iron oxide of Fe3O4, which has been proven to be biocompatible in bioapplications, especially when combined with carbon material (Fang, Cheng, Zhang, Zhang, & Keidar, 2018;Wang et al, 2018). Some methods that have been used to synthesize iron oxide/carbon (Fe3O4/C)-based materials include the solvothermal method (Ren, Lin, Meng, & Zhang, 2019;Vinodhkumar et al, 2020), the hydrothermal method (Li et al, 2019), and the arc discharge method (Peggiani et al, 2020;Saraswati, Retnosari, Hayati, Amalia, & Hastuti, 2018;Zhao et al, 2019). In general, the arc discharge method can be performed in both a low-pressure chamber and in a liquid medium.…”

Section: Introductionmentioning

confidence: 99%

Purification of Carbon-Based Magnetic Nanoparticles (CMNs) Produced by Submerged Arc Discharge in Liquid Ethanol/Ethylenediamine

Mayasari

Kuswari

Lestari

et al. 2021

Molekul

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Surface modification of covalently amine-attached carbon-based magnetic nanoparticles (CMNs) can be produced quite simply in submerged arc discharge using the amine-containing liquid medium ethylenediamine (ED), resulting in CMNs-ED. However, after the arc discharge processing, the resulting nanoparticles possibly contain physically absorbed amine-containing molecules from a liquid medium on the particle surface. To remove the non-covalently bound molecules, a purification process is required. In this study, the purification was conducted using polar and non-polar solvents following the synthesis process. The surface property was initially characterized by a dispersion test in water, showing that CMNs-ED purified by water have better dispersion than CMNs produced in ethanol alone, CMNs-ED before purification, and CMNs-ED after purification by immersion in toluene. Before and after purification, the diffraction pattern showed definitive peaks corresponded to the crystal planes of C(002), Fe3C(220), and Fe3O4(311) at 26.51°, 44.65°, and 35.42°, respectively. The amine functional group on the nanoparticles before purification thought to come from decomposed ethylenediamine assigned by the vibration peaks appeared at a wavenumbers ~3400 cm-1 and 1020-1220 cm-1, which corresponds to N-H and C-N, respectively. After purification, the vibration peaks of amine groups were still observable, indicating that the amine groups were still covalently attached to the nanoparticles. Magnetic analysis showed that CMNs before and after purification have superparamagnetic properties, with the magnetic saturation value around 10-17 emu/g. The electron microscope images show that the CMNs-ED before purification have a spherical form with a diameter larger than CMNs-ED after purification.

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Size-selected polyynes synthesised by submerged arc discharge in water

Cited by 16 publications

References 44 publications

In situ synthesis of polyynes in a polymer matrix via pulsed laser ablation in a liquid

In situ synthesis of polyynes in a polymer matrix via pulsed laser ablation in a liquid

Solvent-dependent termination, size and stability in polyynes synthesis by laser ablation in liquids

Purification of Carbon-Based Magnetic Nanoparticles (CMNs) Produced by Submerged Arc Discharge in Liquid Ethanol/Ethylenediamine

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