Nanohybrid Cu@C: synthesis, characterization and application in enhancement of lubricity

Kumar, Bharat; Verma, Dinesh K.; Singh, Alok Kumar; Kavita, .; Shukla, Neha; Rastogi, Rajesh P.

doi:10.1080/09276440.2019.1697134

Cited by 16 publications

(12 citation statements)

References 70 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The three sharp characteristic peaks located at diffraction angles of 43.2°, 50.3°, and 73.9° can be respectively attributed to the lattice planes of (111), ( 200) and (220) from the copper nanoparticles (PDF#04-0836) [32,33]. The broad peak with the center around 25° corresponds to the (002) crystalline face from the graphitized carbon, which will promotes the electron transport in subsequent electrochemical reactions [3,25,34]. To analyze the specific compositions of carbon, the Raman spectra of Cu NP@PC and Cu NP/C were collected.…”

Section: Resultsmentioning

confidence: 99%

Porous Carbon Substrate Improving the Sensing Performance of Copper Nanoparticles Toward Glucose

Feng

et al. 2021

Nanoscale Res Lett

View full text Add to dashboard Cite

An accurate sensor to rapidly determine the glucose concentration is of significant importance for the human body health, as diabetes has become a very high incidence around the world. In this work, copper nanoparticles accommodated in porous carbon substrates (Cu NP@PC), synthesized by calcinating the filter papers impregnated with copper ions at high temperature, were designed as the electrode active materials for electrochemical sensing of glucose. During the formation of porous carbon, the copper nanoparticles spontaneously accommodated into the formed voids and constituted the half-covered composites. For the electrochemical glucose oxidation, the prepared Cu NP@PC composites exhibit much superior catalytic activity with the current density of 0.31 mA/cm2 at the potential of 0.55 V in the presence of 0.2 mM glucose. Based on the high electrochemical oxidation activity, the present Cu NP@PC composites also exhibit a superior glucose sensing performance. The sensitivity is determined to be 84.5 μA /(mmol.L) with a linear range of 0.01 ~ 1.1 mM and a low detection limit (LOD) of 2.1 μmol/L. Compared to that of non-porous carbon supported copper nanoparticles (Cu NP/C), this can be reasonable by the improved mass transfer and strengthened synergistic effect between copper nanoparticles and porous carbon substrates.

show abstract

Section: Resultsmentioning

confidence: 99%

Porous Carbon Substrate Improving the Sensing Performance of Copper Nanoparticles Toward Glucose

Feng

et al. 2021

Nanoscale Res Lett

View full text Add to dashboard Cite

show abstract

“…A little shift in the peaks indicates that the zinc oxide nanorod might have tribosinterized at the tribosurfaces. Besides, the iron of the steel surface is oxidized to ferric oxide, as revealed by the presence of peaks in the Fe 2p spectrum for Fe 2p 3/2 (710.5 eV) and Fe 2p 1/2 (724.2 eV). − Thus, based on the characterization of tribofilm by XPS spectra, it may be inferred that tribofilm is made up of the adsorbed organic contents of g-C 3 N 4 , N–ZnO, and tribochemically oxidized Fe 2 O 3.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Employing lubricants with additional friction modifiers produces encouraging results. An extensive overview of literature proclaims that several types of nanomaterials such as nanoparticles, nanosheets, or nanocomposites have been used for the purpose owing to their fast tribo-action. − Nowadays, carbon-based materials such as graphene, fullerene, and carbon nanotubes are the center of attention in this innovative research area. − From our laboratory, too, carbon microspheres, , reduced graphene oxide, and their composites with nanoparticles, doped nanoparticles, or nanosheets have been recently documented as tribologically active materials. − A carbon nitride polymer of high thermal stability possessing graphitic structure g-C 3 N 4 with weak van der Waals forces amid the 2D-nanosheets appears to be very influential in the field. Still, it has been seldom studied. , Zhu et al have described the antiwear performance of bulk g-C 3 N 4 with polyvinylidene difluoride (PVDF) .…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Triboactivity of Nanolamellar Graphitic-C₃N₄ by N-Doped ZnO Nanorods

Singh

Shukla

Verma

et al. 2021

Ind. Eng. Chem. Res.

Self Cite

View full text Add to dashboard Cite

The tribological activity of the synthesized nanosheets of a polymeric graphitic carbon nitride, g-C3N4, was upgraded by introducing hydrothermally synthesized N-doped zinc oxide nanorods. The high-resolution scanning electron microscopy, TEM, and HR-TEM studies of the hybrid (N–ZnO/g-C3N4) reveal that N-doped ZnO nanorods were spread over g-C3N4 nanosheets. The tribological activity of well-characterized nanomaterials was graded in paraffin oil (PO) at an optimized concentration, 0.20% w/v, on a four-ball tester conducting ASTM D4172 and ASTM D5183 tests. According to the observed tribological data, mean wear scar diameter, friction coefficient (COF), and seizure load, nanorods performed much better than the nanosheets. The hybrid exhibited highly advanced activity because of the synergy between noncovalently interacting nanorods and nanosheets. The SEM and AFM analyses of the wear pathway corroborated the tribological results. The energy-dispersive X-ray and X-ray photoelectron spectroscopy studies of the tribofilm confirmed the elemental composition and chemical states of all the elements, respectively. A possible mechanism of lubrication has been presented.

show abstract

“…Characterization of the additives. The instrumentations used for characterization of the additives was the same as reported in our earlier communications 35,36 and have been appended in supplementary information, SI-1.…”

Section: Methodsmentioning

confidence: 99%

Tribological activity of ionic liquid stabilized calcium-doped ceria nanoparticles

Kumar

Verma

Kavita

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part J:

Self Cite

View full text Add to dashboard Cite

10% Calcium-doped ceria (CCO) nanoparticles have been synthesized by sol–gel method. Their surface has been modified by surfactants, sodium dodecyl sulfate and 1-decyl-3-methyl imidazolium bis(trifluoromethyl sulfonyl) imide to yield SCCO and IL-CCO respectively. Powder X-ray diffraction patterns of nanoparticles and surface modified nanoparticles are indicative of cubic phase of ceria. Fourier transform infrared spectra confirm the surface modification of nanoparticles, particularly with ionic liquid. Morphology of the as-prepared nanoparticles investigated by field emission scanning electron microscopy, transmission electron microscopy/high-resolution transmission electron microscopy reveals that there is decrease in size of nanoparticles from CCO followed by SCCO and then IL-CCO. Wrapping of nanoparticles by ionic liquid is apparent in the scanning electron microscopy (SEM) and transmission electron microscopic (TEM) images. The tribological activity of the well-characterized nanoparticles has been evaluated at the optimized concentration, 0.2% w/v in paraffin oil under ASTM D4172 and ASTM D5183 test conditions using a four-ball tester. Based on tribological parameters, mean wear scar diameter, average friction coefficient, load-carrying capacity, and loss of frictional power, their relative performance followed the order – IL-CCO > SCCO > CCO. Worn surface analysis by scanning electron microscopy/energy-dispersive X-ray spectroscopy, atomic force microscopy corroborated the tribological performance. The order of the activity could be correlated with the size of the nanoparticles. Moreover, lubricating properties of ionic liquid have been instrumental for the exalted activity of IL-CCO. The presence of heteroatoms of ionic liquid, nitrogen, oxygen, fluorine, sulfur along with calcium and cerium of nanoparticles in energy-dispersive X-ray (EDX) spectroscopy analysis of the wear scar surface lubricated with IL-CCO confirms the vital role of ionic liquid towards the tribological activity.

show abstract

Nanohybrid Cu@C: synthesis, characterization and application in enhancement of lubricity

Cited by 16 publications

References 70 publications

Porous Carbon Substrate Improving the Sensing Performance of Copper Nanoparticles Toward Glucose

Porous Carbon Substrate Improving the Sensing Performance of Copper Nanoparticles Toward Glucose

Enhancement of Triboactivity of Nanolamellar Graphitic-C₃N₄ by N-Doped ZnO Nanorods

Tribological activity of ionic liquid stabilized calcium-doped ceria nanoparticles

Contact Info

Product

Resources

About

Nanohybrid Cu@C: synthesis, characterization and application in enhancement of lubricity

Cited by 16 publications

References 70 publications

Porous Carbon Substrate Improving the Sensing Performance of Copper Nanoparticles Toward Glucose

Porous Carbon Substrate Improving the Sensing Performance of Copper Nanoparticles Toward Glucose

Enhancement of Triboactivity of Nanolamellar Graphitic-C3N4 by N-Doped ZnO Nanorods

Tribological activity of ionic liquid stabilized calcium-doped ceria nanoparticles

Contact Info

Product

Resources

About

Enhancement of Triboactivity of Nanolamellar Graphitic-C₃N₄ by N-Doped ZnO Nanorods