Mixed phase, sp2–sp3 bonded, and disordered few layer graphene-like nanocarbon: Synthesis and characterizations

Kumar, Arvind; Patil, S. I.; Joshi, Anupama; Bhoraskar, V.N.; Datar, Suwarna; Alegaonkar, P.S.

doi:10.1016/j.apsusc.2013.01.097

Cited by 28 publications

(24 citation statements)

References 42 publications

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“…It is well known that, C-C sp 2 surface functional groups can act as scattering centres which may provide exceptional electrical and optical properties, high resistivity and electron mobility in carbon materials. [55][56][57][58] The measured photoluminescence (PL) emission spectra of SWP700 and TiO2/SWP700 prepared by ultrasound-based procedures and TiO2/SWP700 prepared without ultrasound are presented in Fig. S5 (Supplementary information).…”

Section: Photocatalytic Activity In Aqueous Phasementioning

confidence: 99%

Dual Functionality of TiO₂/Biochar Hybrid Materials: Photocatalytic Phenol Degradation in the Liquid Phase and Selective Oxidation of Methanol in the Gas Phase

Lisowski

Colmenares

Mašek³

et al. 2017

ACS Sustainable Chem. Eng.

148

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A series of new inorganic-organic hybrid materials based on TiO2 and new biochar-based supports (biochar obtained by pyrolysis of Miscanthus Straw Pellets (MSP) and Soft Wood Pellets (SWP) at 550 and 700 o C) were successfully prepared using ultrasound-assisted methodology. The resulting composites were characterized by a wide range physicochemical techniques and investigated in water and gas phase photocatalytic test reaction. Our best composite (TiO2/SWP700) achieved phenol degradation of 64.1% (under UV light) and 33.6% (under visible light). In addition, it also showed an extraordinarily high activity (~90 %) in selective oxidation of methanol to methyl formate in flow gas phase, high selectivity to methyl formate (~80 %) and high yield of methyl formate (~88 %) after 240 minutes of illumination. It can be noticed that when TiO2 is supported on biochar, presented a superior photocatalytic ability and could be recycled at least 5 times in both photocatalytic runs tests with reproducible high photocatalytic efficiency.

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Section: Photocatalytic Activity In Aqueous Phasementioning

confidence: 99%

Dual Functionality of TiO₂/Biochar Hybrid Materials: Photocatalytic Phenol Degradation in the Liquid Phase and Selective Oxidation of Methanol in the Gas Phase

Lisowski

Colmenares

Mašek³

et al. 2017

ACS Sustainable Chem. Eng.

148

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“…GLNR were obtained by following the synthesis protocols reported in [9,18], whereas SHPB measurements were performed as per the procedures in the reference [9]. GLNR samples subjected to SHPB were termed HSR GLNR samples.…”

Section: Methodsmentioning

confidence: 99%

Surface Interactions of Transonic Shock Waves with Graphene-Like Nanoribbons

et al. 2020

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Graphene-like nanoribbons (GLNRs) were fabricated (length—20 μm; width—2 μm) and subjected to blast-like pulsed pressure >1.5 GPa (pulse speed ≈1 Mach, impulse duration, ≈µs) to examine the amount of absorption. GLNRs prepared by the chemical vapor deposition technique via controlled biomass combustion were subjected to investigate the structure–property characteristics using microspectroscopic techniques. Following this, GLNRs were employed to high strain rate (HSR) studies with the help of the technique known as split Hopkinson pressure bar (SHPB) to evaluate numerous dynamic parameters. The parameters were extracted from variations in the stress and strain rates. Their analysis provided insight into the damping response of blast energy within GLNRs. By and large, the impact generated modified the microstructure, exhibiting modifications in the number of layers, conjugated loops, and dynamic disorder. Signal processing analysis carried out for incident and transmitted impulse pressure revealed an interaction mechanism of shock wave with GLNR. Details are presented.

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“…The details are presented in reference. 25 The Figure 3c and 3d, spectra recorded for, respectively, 1 and 25 wt% GNCs/PU nanocomposite systems; indicated significant modifi- be contributing to bonding with GNCs via hydro-sorption. In this, the double bonded site could be more reactive, due to π-conjugation, and the effect is, probably, dominant at these sites.…”

Section: Characterizations and Measurementsmentioning

confidence: 95%

Impressive Transmission Mode Electromagnetic Interference Shielding Parameters of Graphene-like Nanocarbon/Polyurethane Nanocomposites for Short Range Tracking Countermeasures

Kumar

Alegaonkar

2015

ACS Appl. Mater. Interfaces

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Shielding the microwave signature (8.2-12.4 GHz, X-band) of a locked in target is a tactically important electronic countermeasure. Herein, we report on mitigation in X-band transmission mode shielding parameters for polyurethane (PU), after incorporating graphene-like nanocarbon sheets (GNCs). Initially, PU and variable weight percent (1-25) GNCs/PU paste samples were subjected to Fourier transform infrared, Raman spectroscopy, and scanning electron microscopy. These samples were molded into toroidal shaped specimens by adiabatic hot-pressing technique, for microwave scattering measurements. Parameters, such as complex permittivity (ϵ'-jϵ″), alternating current (ac) conductivity, skin thickness, transmission (S21), effective transmission loss (SET), and shielding effectiveness were determined, in addition to direct current (dc) conductivity. The real and imaginary components are increased, respectively, by ∼5 and ∼30 times, whereas loss tangent, by ∼7, at 25 wt % loading of GNCs. The ac conductivity is enhanced from 0.248 (PU) to 7.288 S/m (25 wt %) by maximizing transmission loss to -26.45 dB (99.9%) and minimizing thickness to 1-2 mm. The dc percolation threshold is found to be low at ∼5 wt %, indicating superior dispersibility of GNCs, thereafter. In analysis, the atomic polarization (at ∼10 GHz) associated with the aromatic urethane amide rings acts as a backbone to engage incident electromagnetic field wiggles. The coupling occurs via charge transfer polarization currents at doubly bonded nitrogen, oxygen, and hydrosorpted sp3 carbon sites in GNCs. The field-matter interaction is dominant at the microvoid skin interface between GNCs and PU. Possible polarization mechanism is explained. The GNCs/PU nanocomposites are realized as an effective electromagnetic interference shielding block in the tracking band. The details are presented.

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Mixed phase, sp2–sp3 bonded, and disordered few layer graphene-like nanocarbon: Synthesis and characterizations

Cited by 28 publications

References 42 publications

Dual Functionality of TiO₂/Biochar Hybrid Materials: Photocatalytic Phenol Degradation in the Liquid Phase and Selective Oxidation of Methanol in the Gas Phase

Dual Functionality of TiO₂/Biochar Hybrid Materials: Photocatalytic Phenol Degradation in the Liquid Phase and Selective Oxidation of Methanol in the Gas Phase

Surface Interactions of Transonic Shock Waves with Graphene-Like Nanoribbons

Impressive Transmission Mode Electromagnetic Interference Shielding Parameters of Graphene-like Nanocarbon/Polyurethane Nanocomposites for Short Range Tracking Countermeasures

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Mixed phase, sp2–sp3 bonded, and disordered few layer graphene-like nanocarbon: Synthesis and characterizations

Cited by 28 publications

References 42 publications

Dual Functionality of TiO2/Biochar Hybrid Materials: Photocatalytic Phenol Degradation in the Liquid Phase and Selective Oxidation of Methanol in the Gas Phase

Dual Functionality of TiO2/Biochar Hybrid Materials: Photocatalytic Phenol Degradation in the Liquid Phase and Selective Oxidation of Methanol in the Gas Phase

Surface Interactions of Transonic Shock Waves with Graphene-Like Nanoribbons

Impressive Transmission Mode Electromagnetic Interference Shielding Parameters of Graphene-like Nanocarbon/Polyurethane Nanocomposites for Short Range Tracking Countermeasures

Contact Info

Product

Resources

About

Dual Functionality of TiO₂/Biochar Hybrid Materials: Photocatalytic Phenol Degradation in the Liquid Phase and Selective Oxidation of Methanol in the Gas Phase

Dual Functionality of TiO₂/Biochar Hybrid Materials: Photocatalytic Phenol Degradation in the Liquid Phase and Selective Oxidation of Methanol in the Gas Phase