Surface Of Multi-walled Carbon Nanotubes Research Articles

Immuno-probed multiwalled carbon nanotube surface for abdominal aortic aneurysm biomarker analysis.

Abdominal aortic aneurysm (AAA), a medical complication, occurs when the aortic area becomes swollen and very large. It is mandatory to identify AAA to avoid the breakdown of aneurysms. C-reactive protein (CRP) has been recognized as one of the biomarkers for identifying AAA due to the possibility of CRP produced in vascular tissue, which contributes to the formation of an aneurysm, and it is elevated in patients with a ruptured AAA. This research work was designed to develop an immunosensor on a multiwalled carbon nanotube (MWCNT)-modified surface to quantify the CRP level. Anti-CRP specificity was constructed on the MWCNT surface through a silane linker to interact with CRP. The detection limit of CRP was calculated as 100 pM with an R2 (determination coefficient) value of 0.9855 (y = 2.3446x - 1.9922) on a linear regression graph. The dose-dependent linear pattern was registered from 200 to 3000 pM and attained the saturation level during binding at 3000 pM. Furthermore, serum-spiked CRP showed a clear increase in the current response, proving the specific recognition of CRP in biological samples. This designed biosensor identifies CRP at a lower level and can help diagnose AAA.

Enhancing multiwalled carbon nanotubes/ poly(amide-imide) interfacial strength through grafting polar conjugated polymer on multiwalled carbon nanotubes

In this study, a polar conjugated polymer (poly(o-methoxyaniline), POMA) was for the first time grafted onto multiwalled carbon nanotubes (MWCNTs) as we know, and the MWCNTs grafted POMA (POMA-g-MWCNTs) as filler was incorporated into poly(amide–imide) (PAI) to fabricate PAI/POMA-g-MWCNTs conductive polymer composites (CPCs). In PAI/POMA-g-MWCNTs CPCs, MWCNTs constructed conductive phase, PAI constructed polymer matrix phase, and the grafted POMA on the surface of MWCNTs blended with PAI matrix constructed POMA/PAI mixed phase. The mixed phase enhanced the interfacial strength between conductive filler and polymer matrix through the strengthened hydrogen bond interaction, and improved the dispersion of conductive filler in the polymer matrix compared to the PAI/MWCNTs binary and PAI/POMA/MWCNTs ternary blend, which is helpful for charge, load, and thermal transfer. As a result, the electrical conductivity increased from 13.5 S m–1 for PAI/MWCNTs binary blend to 48.4 S m–1 for PAI/POMA/MWCNTs ternary blend, and further increased to 79.6 S m–1 for PAI/POMA-g-MWCNTs grafted blend. In addition, the tensile strength increased from 50 MPa for PAI/MWCNTs binary blend to 65 MPa for PAI/POMA/MWCNTs ternary blend, and further increased to 74 MPa for PAI/POMA-g-MWCNTs grafted blend. These results suggested that grafted polar conjugated polymer onto the surface of carbon nanotubes is an effective way to improve the miscibility between carbon nanotubes and polymer matrix.

Analysis of structure and electrochemical characteristics of multi-walled carbon nanotubes doped with nitrogen using ion irradiation

Comparative study of the electronic structure and electrochemical characteristics of multi-walled carbon nanotubes (MWCNTs) doped with nitrogen using synthesis with a nitrogen-containing precursor (N-MWCNTs), as well as using N2+ ion irradiation with an average energy of ∼ 5 keV was provided. Using XPS, it was shown that the surface of irradiated MWCNTs contains 5.6 at.% nitrogen, which is predominantly in the pyridine and pyrrole configurations, as well as there are 12.8 at.% of oxygen in carbon–oxygen and nitrogen–oxygen chemical bonds. The N-MWCNTs surface contains 2.5 at.% nitrogen, ∼ 25% of which presents in the form of N2. An analysis of the electrochemical characteristics showed that irradiated carbon nanotubes have higher specific capacitance and rate capability. It is shown that the increase in characteristics is provided due to reversible redox processes occurring with the participation of nitrogen and oxygen groups on the surface of carbon nanotubes.

Effects of preliminary ion beam treatment of carbon nanotubes on structures of interfaces in МОх/multi-walled carbon nanotube (M =Ti,Sn) composites: Experimental and theoretical study

In this study, ion beam treatment was investigated as a method for functionalizing the surfaces of multi-walled carbon nanotubes (MWCNTs) employed in the production of composites with titanium and tin oxides using magnetron sputtering. Preliminary ion irradiation of MWCNTs obtained a uniform distribution of metal oxides over their surfaces. According to the experimental results, interfacial adhesion in the composites was increased due to the interactions between metal oxides and oxygen-containing functional groups on the surfaces of the MWCNTs. Quantum chemical calculations demonstrated the possibility of M-O-C bonds (M = Ti, Sn) forming with the participation of CO groups fixed on the graphene plane near vacancy-type defects. The features of Ti–O–C and Sn–O–C bonds were investigated based on electron density difference analysis and the density of states of the outer electron shells.

Novel photothermal therapy using multi-walled carbon nanotubes and platinum nanocomposite for human prostate cancer PC3 cell line

Multi-walled carbon nanotubes (MWCNTs) coated with platinum nanoparticles (Pt-NPs) was prepared as a novel composite nanomaterial by using waste synthetic oil and green chemistry. MWCNT and Pt-NPs were characterised through TEM, FE-SEM, AFM and FT-IR techniques. The diameters of the synthesised MWCNTs and Pt-NPs were 26.80–44.66 and 56.49–89.38 nm, respectively. The formation of MWCNT-COOPt and MWCNT-Pt was confirmed using Raman and EDX techniques. The effect of MWCNT-COO, MWCNT-COOPt and MWCNT-Pt on prostate cancer cell line PC3 was studied by MTT assay at various concentrations following near-infrared (NIR) irradiation (λ=1064 nm, P = 15.3 W) at different time intervals (30, 60, 90 and 120 s). The composite of Pt-NPs upon the MWCNT surface enhanced its ability to absorb NIR radiation, leading to an increase in the temperature of cancer cells due to plasmon phenomenon. The composites were utilised in a novel treatment against human PC3 cell line. The maximum temperatures for MWCNT-COO, MWCNT-COOPt and MWCNT-Pt recorded with 25 µg/mL were 43.4 °C, 45.8 °C and 46.2 °C, respectively, and irradiation time was recorded at 120 s. These compounds exhibited high cytotoxicity towards human PC3 cells (58.6%, 71.6% and 79.6%), respectively. The combination of MWCNTs and Pt-NPs in photothermal therapy has potential to be used in local therapy for prostate cancer in a time- and concentration-dependent manner.

Three‐dimensional graphene/MWCNT-MnO2 nanocomposites for high‐performance capacitive deionization (CDI) application

Surface area and the conductivity of the electrode materials are crucial in achieving high desalination performance in capacitive deionization (CDI) applications. In this study, we have successfully fabricated 3D Graphene/MWCNT-MnO2 nanocomposites by self-assembling negatively charged manganese dioxide (MnO2) decorated with multiwall carbon nanotube (MWCNT) and positive graphene oxide (GO). The MWCNT-MnO2 was prepared by the uniform decoration of MnO2 nanoparticles on the MWCNT surface, and positive GO was prepared by functionalizing the GO surface with ethylenediamine. The 3D composite was obtained by self-assembling positive GO and negative MWCNT-MnO2 via electrostatic co-precipitation method followed by hydrothermal treatment. The structure and morphology of the 3D composites materials are thoroughly studied and correlated with the electrochemical performance. Cyclic voltammetry (CV) curves exhibit high specific capacitances and depict a quasi-rectangular shape, suggesting a high pseudo-capacitive behavior resulting from electrical double-layer (EDL) at the electrode-solution interface and the presence of MnO2. The salt electrosorption capacity of the 3D composites investigated using 600 ppm NaCl solution and 1.2 V showed the highest salt adsorption capacity of 65.1mgNaClg-1. The excellent performance of the 3D composite materials as the electrode is attributed to the three-dimensional macroporous architectures and a high pseudo-capacitive behavior. Moreover, the study suggests that the electrode performance can be altered by choosing suitable anode materials.

In situ growth of graphitic carbon nitride on multiwalled carbon nanotubes for interfacial thermal management

This work reports a facile method for in situ growth of graphitic carbon nitride (CN) on surface of multiwalled carbon nanotubes (CNTs), which was performed via the self-assembly of molecular precursors of CN on CNTs and subsequent calcination step. The self-assembly was directed by the hydrogen bonds formed between amino groups of Melamine and carboxyl units of CNTs. After polycondensation reaction, CN nanostructures grew homogeneously on surface of CNTs possibly linked by covalent bonds. The incorporation of CN improved the interfacial properties of CNTs by increasing the functional groups and wettability, which could promote the dispersion of CNTs in polymer matrix and enhance the heat conductive capacity. Accordingly, the obtained thermal conductive silicon grease involving CNTs/CN nanocomposites showed an enhancement in thermal conductivity at a loading amount of CN (~ 8%). Meanwhile, the insulation resistance of the nanocomposites increased significantly with the dose amount of CN due to its semi-conductivity. Therefore, the obtained CNTs/CN nanocomposites were suitable for interfacial thermal management that require high thermal conductivity and electrically insulative properties.

Facile one-step synthesis of Au-ZnO/MWCNTs for photocatalytic treatment of Reactive Blue dye in aqueous solution

In this work, the multiwall carbon nanotubes (MWCNTs) based gold-zinc oxide (Au-ZnO) nanocomposite has been synthesized for visible light driven photocatalytic decolorization of reactive blue-4 (RB4) dye. The Au-ZnO/MWCNTs nanophotocatalyst has been successfully synthesized via thermal treatment method at 600 0C. The physico-chemical properties of MWCNTs and Au-ZnO/MWCNTs have been investigated via powder X-ray diffraction (XRD) spectroscopy, UV-visible diffuse reflectance spectroscopy (UV-DRS), Fourier transform infrared spectroscopy (FTIR)scanning electron microscope (SEM), atomic force microscopy (AFM) and transmission electron microscopy (TEM). The synergistic effect of MWCNTs and Au NPs doping could offers an interesting opportunity to design photocatalyst material with the maximum absorption shift to the visible region of the spectrum, where photocatalytic activity can be enhanced. The results exhibited the growth of Au and ZnO nanoparticles (NPs) on the MWCNTs surface with an average diameter of 20 – 30 nm. The photodecolorization of RB4 dye was investigated by changing pH (3-11), dosage of photocatalyst (0.2-1.4 g/L), and initial RB4 concentration (25–100 mg/L). Under best treatment conditions (pH 11 and catalyst dosage 1.0 g/L), the best photodecolorization efficiency was reached 94.91 %. Based to the obtained results, the photodecolorization efficiency adopting Au-ZnO/MWCNTs photocatalyst was stated to be a promising route for remediation the organic pollutants in aqueous solutions

Magnetic nanoparticles based on cerium MOF supported on the MWCNT as a fluorescence quenching sensor for determination of 6-mercaptopurine

In this study, a new magnetic nanocomposite was developed as an efficient and fast-response fluorescence quenching sensor for determination of anticancer drug 6-mercaptopurine (6-MP). For this purpose, the needle-shape fluorescence metal-organic framework of cerium (Ce-MOF) were successfully synthesized on the surface of multiwalled carbon nanotubes using 1,3,5-benzenetricarboxylic acid ligand via a facile solvothermal assisted route and magnetized. The accuracy of the proposed synthesis was confirmed using the FT-IR, FE-SEM, XRD, and VSM methods. The obtained product as presented the fluorescence emission in 331 nm by excitation of 293 nm in excitation/emission slit widths of 10.0 nm. The operation of suggested method is based on quenching the fluorescence signal in accordance with increasing the 6-MP concentration. The proposed assay effectively detected the trace amount of 6-MP in the linear range of 1.0 × 10−6 to 7 × 10−5 M. The limit of detection and limit of quantification were obtained as 8.6 × 10−7 and 2.86 × 10−6 M, respectively. The analyte molecule was determined in real samples with satisfactory recoveries between 98.75 and 105.33.

Tunable optical nonlinearities of MWCNTs with core-satellite ZnS-Au structure

In order to modulate the nonlinear optical (NLO) properties of multi walled carbon nanotubes (MWCNTs) and make them applicable to ultrafast nonlinear optical devices, we fabricated a core satellite ZnS-Au nanostructure on the surface of MWCNTs via the solvothermal method. The structure and morphology of the MWCNTs-Au-ZnS product were characterized by means of the XRD, SEM and XPS, which showed that the ZnS-Au nanoassemblies were combined along with the MWCNTs through C S covalent bond and partial ionic bond. The optical nonlinearities of the MWCNTs-Au-ZnS system were investigated using the Z-scan technique under the excitation of 532 nm ps laser pulses and kinetically analyzed using the pump-probe transient absorption spectroscopy. The results showed that the saturation absorption (SA) coefficient and the third-order nonlinear susceptibility of the MWCNTs-Au-ZnS system were adjustable with the variation of the core-satellite structure. The intensity of the saturation absorption was tuned downward below that of the pure MWCNTs, while the susceptibility of the system was tuned upward above that of the pure MWCNTs, which were attributed to the combined action of two-photon absorption of ZnS, charge transfer in the system, trap states provided by Au and charge delocalization varying with the size. These tunable nonlinearities will expand the applications of the MWCNTs-Au-ZnS system in photonic devices. • Core-satellite structure of ZnS-Au is fabricated on the surface of MWCNTs via a solvothermal method. • The core-satellite structure is connected with MWCNTs via covalent bond and partial ionic bond. • The nonlinear absorption and refraction of the MWCNTs-Au-ZnS are tuned by changing the core-satellite structures.

Unveiling the Na-ions storage mechanism and sodiation-induced brittleness of multiwalled carbon nanotubes

Although the multiwalled carbon nanotubes (MWCNTs) are considered as ideal conductive network or buffer materials in the electrode materials due to their good mechanical property and high conductivity, their practical electrochemical performance and mechanical behavior in the sodium-ion batteries (SIBs) are still unclear. In this work, the sodiation/desodiation mechanism of MWCNTs and their mechanical properties are revealed by in situ transmission electron microscopy (TEM). It is found the solid electrolyte interface layer easily grow on the surface of sodiated MWCNT, and the fish scale-like sodium dendrites appear on the surface with further sodiation. There is an unconventional decrease in the width of MWCNT during the sodiation process, which can be due to the collapse of the crystal lattices of MWCNT caused by the intercalation of Na-ions and the loss of carbon caused by the Joule heating effect. In situ bending experiments show that the pristine MWCNTs show excellent mechanical property, while the MWCNTs after electrochemical process break easily even without external force. It is determined that the sodiation process aggravates the brittleness of MWCNTs. Our detailed in situ results provide direct evidence and understanding on the degradation mechanism of MWCNTs as electrode materials in SIBs.

The hybrids of perylene tetracarboxylic acid functionalized multi-walled carbon nanotubes and chitosan for electrochemical chiral sensing of tryptophan enantiomers

To introduce abundant carboxyl (COOH) groups to the surface of multi-walled carbon nanotubes (MWCNTs) while maintaining the pristine structure of MWCNTs, 3,4,9,10-perylene tetracarboxylic acid (PTCA) was non-covalently grafted to the sidewalls of MWCNTs. The obtained PTCA functionalized MWCNTs (MWCNTs–PTCA) functioned as a scaffold for the further introduction of chitosan (CS) via electrostatic attractions and hydrogen-bonds. The resultant CS/MWCNTs–PTCA could be used for electrochemical chiral sensing of tryptophan (Trp) enantiomers due to the intrinsic chirality of CS and the high electrocatalytic activity of MWCNTs. Under optimized conditions, the Trp enantiomers could be effectively discriminated at the CS/MWCNTs–PTCA modified electrode by differential pulse voltammetry (DPV), demonstrating that the developed CS/MWCNTs–PTCA might be a potential candidate for the construction of electrochemical chiral sensors.

A multi-functional model based on confined assembly of polyaniline on the surface of multiwalled carbon nanotubes as framework for high-performance lithium-sulfur battery

Lithium-sulfur (Li-S) battery is one of the most promising energy storage devices but suffer from insufficient cyclability and low utilization of sulfur caused by insulative nature of sulfur and the shuttle effect of Li-S battery. To address the abovementioned issues, a strategy based on confined assembly of polyaniline (PANI) on multiwalled carbon nanotubes (MWNTs) drive by the π-π electronic interaction is proposed to prepare MWNTs@PANI model. Benefit from the doping characteristic of PANI, various multifunctional dopants can be introduced to adjust the aggregation structure of PANI and construct a functionally improved model, and most importantly, the various functional groups of dopants provide an extra boost for suppression of the shuttle effect. Benefit from the unique microstructure and multi-functional groups, the cathode based on MWNTs@PANI model delivers the initial discharge capacity of 1309 mAh g−1 at 0.1C, and exhibits a stable capacity of 672 mAh g−1 even after cycling for 250 times at 1C. The assembled soft-packed cell shows an ultrastable open-circuit voltage at various bending states. These results indicate that the MWNTs@PANI model can easily introduce various functional groups to address the challenge from the shuttle effect, which is supposed to accelerate the practical progress of high-performance Li-S battery.

Assessment of M5 model tree for prediction of azithromycin antibiotic removal by multi-wall carbon nanotubes in a fixed-bed column system

Abstract In this research, an M5 model tree is employed for the prediction of removal efficiency of azithromycin antibiotics by multi-wall carbon nanotubes (MWCNTs), based on experimental data sets from a laboratory column mode. The effect of total flow time (0–260 min), influent flow rates (0.5, 1, and 1.5 mL min−1), bed depths (2, 4, and 6 cm), initial azithromycin concentrations (25, 50, and 100 mg L−1), and pHs (2, 4, 6, 8, and 10) was considered in the adsorption process. Based on the obtained structures, three linear equations (LM, LM2, and LM3) were developed. The root mean square error (RMSE) of 9.89% and determination coefficient (R2) of 0.946 were determined for predicting azithromycin removal by the M5 model tree. The results indicated that contact time was more important in the adsorption process, relative to other operating conditions. This research showed that the M5 model tree could be an accurate and faster alternative to the available mathematical models to estimate removal rates of pollutants. The results obtained from the FTIR technique confirmed that the O–H groups on the MWCNTs surface have an important role in azithromycin adsorption.

Dispersion of Multi-Walled Carbon Nanotubes into White Cement Mortars: The Effect of Concentration and Surfactants.

Multi-wall carbon nanotubes (MWCNTs) exhibit exceptional mechanical and electrical properties and can be used to improve the mechanical and piezoelectric properties of cement-based materials. In the present study, the effect of different MWCNT concentrations as well as different types of surfactants and a superplasticizer were examined to reinforce, at the nanoscale, a white cement mortar typically used for the restoration of monuments of cultural heritage. It was shown that sodium dodecylbenzenesulfonate (SDBS) and Triton X-100 surfactants slightly decreased the white cement mortars’ electrical resistivity (by an average of 10%), however, the mechanical properties were essentially decreased by an average of 60%. The most suitable dispersion agent for the MWCNTs proved to be the superplasticizer Ceresit CC198, and its optimal concentration was investigated for different MWCNT concentrations. Carboxylation of the MWCNT surface with nitric acid did not improve the mechanical performance of the white cement nanocomposites. The parametric experimental study showed that the optimum combination of 0.8 wt% of cement superplasticizer and 0.2 wt% of cement MWCNTs resulted in a 60% decrease in the electrical resistivity; additionally, the flexural and compressive strengths were both increased by approximately 25% and 10%, respectively.

Facile preparation of TPU conductive nanocomposites containing polypyrrole-coated multi-walled carbon nanotubes for a rapid and selective response in volatile organic compounds applications

Thermoplastic polyurethane (TPU) conductive nanocomposites were fabricated by using TPU as a matrix and polypyrrole (PPy) coating multi-walled carbon nanotubes (MWCNTs) as conductive filler. The microstructure and gas-sensitive response properties of the nanocomposites to volatile organic vapors (VOCs) were systematically investigated. FTIR and HRTEM verified that PPy was successfully encapsulated on the surface of MWCNTs. FESEM showed that homogeneous dispersion of MWCNTs-g-PPy conductive nanofillers contributed to the formation of continuous conductive networks. The obtained TPU/MWCNTs-g-PPy nanocomposites possessed certain gas-sensitive response selectivity, especially for ammonia gas when compared with other target VOCs. The gas-sensitive response values were in the range of 90–100% with a response time of 40–50 s. An excellent recovery performance at 500 ppm ammonia atmosphere was also achieved. Moreover, the gas-sensitive response values to ammonia showed a good linear relationship with the concentration of ammonia gas. The nanocomposites showed excellent stability in both ammonia and dry-air cycle detection.

Thermally remendable bismalemide-MWCNT/DA-epoxy nanocomposite via Diels-Alder bonding

Developing the self-healing functionality in polymers without affecting its inherent properties is of great practical significance. In this work, first, Bm-MWCNTs nano-particle is prepared by infusing maleimdie moiety on the surface of multiwalled carbon nanotubes (MWCNT). Then, thermally reversible self-healing epoxy resin is prepared using furan-malemide group through Diels-Alder reaction. Finally, Bm-MWCNT/DA-epoxy nanocomposite with self-healing properties is synthesized. Bm-MWCNTs act as a strengthening and repairing agent in epoxy composites. The architecture and thermal stability of Bm-MWCNTs are characterized with FTIR and TG-DTA respectively. FE-SEM images validated, uniform dispersion and bismalemide grafting on MWCNTs. The effective DA-rDA bonds association in Bm-MWCNT/DA-epoxy nano-composite was validated by exo-endothermic peaks in TG-DSC data. The self-healing characterstics of Bm-MWCNT/DA-epoxy nanocomposite were evaluated through TDCB specimen and reported 89% of crack healing efficiency. With 1 wt% of Bm-MWCNT reinforcement, the tensile strength and modulus improved by 202%, 101% respectively compared to neat sample.

Single-step synthesis of TiC mesocrystals on the MWCNTs surface by the pyrolysis of Cp2TiCl2

Titanium carbide mesocrystals have been manufactured by the one-stage metalorganic chemical vapor deposition (MOCVD) technology using the pyrolysis of titanocene dichloride, Cp2TiCl2 (Cp = η5-C5H5) on the surfaces of multi-walled carbon nanotubes (MWCNTs). The initial stages of the Cp2TiCl2 gas-phase dissociation were modeled with density functional theory (DFT) calculations. A series of syntheses were carried out with a step-by-step increase of the Cp2TiCl2 amount. These experiments allows to observe intermediate stages of self-assembly of TiC mesocrystals. Thus, it was possible to identify that the decomposition of Cp2TiCl2 at 900 °C leads to the formation of TiC crystals nanoparticles with their accompanying self-assembly. As a final stage of this process, perfect mesocrystals of a cubic habit with a size of approximately 50 μm were found. The usage of powdered MWCNTs as a substrate in the chemical vapor deposition (CVD) processes provides heterogeneous conditions, which can be promising for the search for new forms of nanostructured materials.

Investigation on photoluminescence properties of MWCNTs@Gd2O3: RE3+ (RE = Eu, Tb, and Tm) hybrid nanocomposites

A facile synthesis of rare earth (RE3+) activated gadolinium oxide (Gd2O3) decorated on the surface of multiwall carbon nanotubes (MWCNT), i.e., MWCNTs@Gd2O3: RE3+ (RE = Eu, Tb, and Tm) have been carried out. The X-ray diffraction patterns and scanning electron microscope (SEM) micrographs of as-prepared nanocomposites confirm the homogeneous dispersion of the nanocomposites. The emission spectrum of MWCNTs@Gd2O3:Eu3+ nanocomposite exhibits the characteristic emission lines of Eu3+ at 590 nm and 610 nm with the radiation of 254 nm. MWCNTs@Gd2O3:Tb3+ nanocomposite displays an intense green emission at 547 nm, while MWCNTs@Gd2O3:Tm3+ nanocomposite shows a strong blue emission at 457 nm under ultra-violet (UV) excitation of 360 nm. The calculated values of emission lifetimes in the studied phosphors could attribute to more radiative relaxation. Henceforth, the results affirm that these spectral engineered luminescent materials may envision prospective applications in fluorescent imaging, bio-separation, fluorescent lamps, and display devices, etc.

Fracture mechanism and scratch behaviour of MWNTs reinforced 70/30 (wt/wt) PC/ABS blends and their nanocomposites

In this work, multiwalled carbon nanotubes (MWNTs) are dispersed in 70/30 (wt/wt) polycarbonate (PC)/acrylonitrile butadiene styrene (ABS) (PC70ABS30) blends and their nanocomposites by the melt-processing method. The morphology observations suggest the development of matrix-droplet morphology. There exists an interaction between MWNTs and the PC phase, which is observed from Raman spectroscopic investigation. Dynamic mechanical analysis (DMA) studies show the increase in storage modulus values depicting the stiffening effect of MWNTs, tanδ value increase depicting the energy dissipation. The flexural and impact properties increase significantly. The mechanism of flexural fracture is craze formation in the skin layer with a shear band and facets formation in the bulk region as observed from the SEM investigation of a flexural fractured surface of MWNTs reinforced PC70ABS30 blends and their nanocomposites. In addition, the deformation at the edge, river-like pattern, striation associated shear bands, craze, cavitation, and facets formation are the impact fracture mechanism as observed from SEM investigation of impact fractured surface of MWNTs reinforced PC70ABS30 blends and its nanocomposites. Scratch studies reveal the improved dispersion of MNNTs at 0.5–1 wt% in PC70ABS30 blends and their nanocomposites with a slightly higher scratch coefficient of friction and scratching force.