Plasma-assisted synthesis of carbon encapsulated magnetic nanoparticles with controlled sizes correlated to smooth variation of magnetic properties

Aomoa, N.; Sarmah, Trinayan; Deshpande, Uday; Sathe, Vasant; Banerjee, A.; Shripathi, T.; Reddy, ‬V. Raghavendra; Lalla, N. P.; Gupta, Ajay; Gupta, Rajeev; Srivastava, Divesh N.; Bordoloi, R.K.; Sarma, Sidananda; Srinivasan, A.; Kakati, M.

doi:10.1016/j.carbon.2014.11.047

Cited by 14 publications

(21 citation statements)

References 44 publications

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“…1a and its inset, the pristine nano-Sn particles exhibit relatively uniform particle size. Their diameter is in the range from *50 to 200 nm, according to five numbers of randomly selected TEM images representing different parts of the same sample [30]. After coating, the nano-Sn particles wrapped with PEDOT:PSS/PVA layer show an obvious core-shell hierarchical structure (Fig.…”

Section: Resultsmentioning

confidence: 99%

A novel nano-Sn particle/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)/poly(vinyl alcohol) core–shell hierarchical composite as high-performance anode material for lithium ion batteries

Meng

et al. 2015

J Mater Sci: Mater Electron

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A novel nano-Sn particle/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)/poly(vinyl alcohol) core-shell hierarchical composite (nano-Sn/ PEDOT:PSS/PVA CSHC) was fabricated for the first time and evaluated as a high-performance anode material in lithium ion batteries (LIBs). The core-shell hierarchical structure of the composite was revealed by field-emission scanning electron microscope and transmission electron microscope; the components of the composite were investigated by X-ray diffraction and fourier transform infrared spectroscopy; the nano-Sn particle content in the composite was obtained by thermogravimetric analysis and the electrochemical performance was studied by galvanostatic charge/discharge cycling tests and electrochemical impedance spectroscopy. When used as LIB anode material, the nano-Sn/PEDOT:PSS/PVA CSHC electrode exhibited high reversible capacity (568 mA h g -1 after 100 charge/discharge cycles at a current density of 100 mA g -1 ), superior cycling stability (capacity retention of 66.0 % after 100 cycles), good rate performance (143 mA h g -1 at 1500 mA g -1 ) and low charge transfer resistance compared to pristine nano-Sn particle and nanoSn/PEDOT:PSS composite electrodes. The improved electrochemical performance can be attributed to the coreshell hierarchical structure. The results show that the nanoSn/PEDOT:PSS/PVA CSHC is a promising anode candidate for next-generation LIBs.

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Section: Resultsmentioning

confidence: 99%

A novel nano-Sn particle/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)/poly(vinyl alcohol) core–shell hierarchical composite as high-performance anode material for lithium ion batteries

Meng

et al. 2015

J Mater Sci: Mater Electron

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“…The Raman spectra were first normalized before calculation of integrated area using Lorentzian fitting. The results indicate that the carbon content of the purified sample was better graphitized compared to our previous samples [8].…”

Section: Xrd and Raman Measurementmentioning

confidence: 53%

“…This is the smallest size for CEMN synthesized by any method to the best of our knowledge. Considering the size distribution as Gaussian, the corresponding standard deviation is estimated at 1.5 nm, which again is the narrowest compared to our previous CEMN samples synthesized at relatively higher pressure [8]. Twin planes or stacking faults are also seen in some well-resolved HRTEM photographs, which are suspected to be γ-Fe because such faults are usually observed in FCC phases only [3].…”

Section: Measurement Of the Cytotoxicity Of The Product Materialsmentioning

confidence: 60%

“…In a previous communication, we had demonstrated synthesis of CEMN by an expanded thermal plasma assisted process, where average size and size distribution were controlled simply by manipulation of the ambient pressure in the sample collection chamber [8]. The average particle size and corresponding coercive fields were seen decreasing continuously upon lowering the chamber pressure.…”

Section: Introductionmentioning

confidence: 99%

“…In CEMN, the protecting carbon shell has the advantage of being light in weight, stable in physiological and hightemperature environments, biocompatible, which can be easily functionalized to carry drugs over its surface. Various techniques have been used for the synthesis of CEMN such as chemical vapor deposition [5], pyrolysis [6], combustion [7], DC thermal plasma synthesis [8], arc discharge synthesis, [9], pulse laser irradiation [10] and RF plasma torch [11]. Plasmaassisted methods, in general, have the advantage of bulk productivity and fine crystallinity of the product materials [8].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis of finest superparamagnetic carbon-encapsulated magnetic nanoparticles by a plasma expansion method for biomedical applications

Sarma

Aomoa

Sarmah

et al. 2018

Journal of Alloys and Compounds

Self Cite

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This paper demonstrates fine size-controlled synthesis of superparamagnetic carbonencapsulated iron nanoparticles, by a supersonic plasma jet assisted rapid, bulk-production process, by manipulation of the pressure in the sample collection chamber. Transmission electron microscopy and small angle x-ray scattering measurements confirmed the formation of single-crystals with a narrow size distribution, having core average size of 5.0 nanometer and encapsulated by an ultrathin carbon coating, for sub-mbar pressure. VSM and Mossbauer characterization established the nanocrystallites to be superparamagnetic in nature, with saturation magnetization 67 emu/g and coercive field 7.4 Oe. Controlled plasma heating during synthesis led to the burning down of extra carbon that resulted in further enhancement of the magnetization of the product. Graphitization of the encapsulating layers also enhanced, which could successfully protect the metallic core from oxidation, as well as improved its cyto-compatibility. This purified sample could be ideal for targeted drugs delivery and water treatment applications. Another sample was processed through controlled reaction with oxygen, the as-synthesized sample having magnetic properties approaching that of the first sample, which may be more attractive especially for water treatment processes because of the simpler single-step processing of the material.

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Mercaptobenzothiazole-functionalized magnetic carbon nanospheres of type Fe3O4@SiO2@C for the preconcentration of nickel, copper and lead prior to their determination by ICP-MS

et al. 2016

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Plasma-assisted synthesis of carbon encapsulated magnetic nanoparticles with controlled sizes correlated to smooth variation of magnetic properties

Cited by 14 publications

References 44 publications

A novel nano-Sn particle/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)/poly(vinyl alcohol) core–shell hierarchical composite as high-performance anode material for lithium ion batteries

A novel nano-Sn particle/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)/poly(vinyl alcohol) core–shell hierarchical composite as high-performance anode material for lithium ion batteries

Synthesis of finest superparamagnetic carbon-encapsulated magnetic nanoparticles by a plasma expansion method for biomedical applications

Mercaptobenzothiazole-functionalized magnetic carbon nanospheres of type Fe3O4@SiO2@C for the preconcentration of nickel, copper and lead prior to their determination by ICP-MS

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