Surface Of Multi-walled Carbon Nanotubes Research Articles

The Identification of Cu-O-C Bond in Cu/MWCNTs Hybrid Nanocomposite by XPS and NEXAFS Spectroscopy.

The results of the research of a composite based on multi-walled carbon nanotubes (MWCNTs) decorated with CuO/Cu2O/Cu nanoparticles deposited by the cupric formate pyrolysis are discussed. The study used a complementary set of methods, including scanning and transmission electron microscopy, X-ray diffractometry, Raman, and ultrasoft X-ray spectroscopy. The investigation results show the good adhesion between the copper nanoparticles coating and the MWCNT surface through the oxygen atom bridge formation between the carbon atoms of the MWCNT outer graphene layer and the oxygen atoms of CuO and Cu2O oxides. The formation of the Cu–O–C bond between the coating layer and the outer nanotube surface is clearly confirmed by the results of the O 1s near edge X-ray absorption fine structure (NEXAFS) and X-ray photoelectron spectroscopy (XPS) of the Cu/MWCNTs nanocomposite. The XPS measurements were performed using a laboratory spectrometer with sample charge compensation, and the NEXAFS studies were carried out using the synchrotron radiation of the Russian–German dipole beamline at BESSY-II (Berlin, Germany) and the NanoPES station at the Kurchatov Center for Synchrotron Radiation and Nanotechnology (Moscow, Russia).

Anchoring HFO nanoparticles on MWCNTs as high electron transfer composite adsorbent for the removal of H2S at low temperature

As a significant component in desulfurizers, iron-based desulfurizer has already been widely investigated in the past decades because of their convenience, low cost and high sulfur capacity. In this work, the highly active hydrated ferric oxide (HFO) nanoparticles anchored on multi-walled carbon nanotubes (MWCNTs) were synthesized via the co-precipitation method. The result of the H2S breakthrough capacity test indicated that the low-temperature desulfurization performance of HFO was significantly promoted by adding of MWCNTs. The best desulfurization performance (144.2 mg g−1) was obtained using the sample with 20 wt% MWCNTs. The structure of formation of HFO is equivalent to the predicted structure by generating simulated powder X-ray diffraction patterns using the Reflex module of Material Studio 2019. The calculation results from VASP show the highly dispersed HFO nanoparticles were anchored on MWCNTs surface, which means the Fe-O-C bond was formed. The improved desulfurization performance was attributed to the dispersion of HFO nanoparticles and more exposed adsorption sites due to the strong interaction between MWCNTs and HFO.

Synthesis of Nanocomposites of V₂OO5©Selenium Nanoparticles and Multiwalled Carbon Nanotubes for Antimicrobial Activity.

The authors report the preparation of the nanocomposite comprising of vanadium pentoxide (V₂O5) and selenium (Se) nanoparticles and functionalized multiwalled carbon nanotubes (MWCNTs) (V₂O5@Se NPs/MWCNTs). Since Se NPs possesses extraordinary physicochemical properties including larger surface area with higher adsorption capacity, V₂O5 NPs were adsorbed onto Se NPs surface through physisorption process (designated as V₂O5@Se NPs). The nanocomposite synthesized hydrothermally was evaluated for its antimicrobial activity. The morphology and microstructure of the nanocomposite were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis, respectively. Fourier transform infrared spectroscopy (FTIR) and UV-Visible spectroscopy (UV-Vis) were employed to analyze the spectral properties of nanocomposite. The microbicidal efficacy of nanocomposite was tested against Gram-negative (G-)ZGram-positive (G+) bacteria and fungus. This is the first report on the synthesis of V₂O5@Se NPs/MWCNTs nanocomposites by chemical method that showed microbicidal effect on micro-organisms. The thiol (-SH) units facilitates the enrichment of V₂O5@Se NPs onto MWCNTs surface. Ultimately, it reflects on the significant antimicrobial activity of V₂O5@Se NPs/MWCNTs.

Surface-treated carbon nanotubes in cement composites: Dispersion, mechanical properties and microstructure

In order to achieve good dispersibility and strong interfacial bonding strength in cement-based composites, multi-walled carbon nanotubes (MWCNTs) were chemically modified by low-temperature plasma. Specifically, pristine MWCNTs (p-CNTs), carboxyl functionalized MWCNTs (c-CNTs) and low-temperature plasma modified MWCNTs (m-CNTs) were incorporated in cement matrix for further reinforcement. The results show that the plasma treatment can efficiently form large amounts of oxygen-containing functional groups on the surface of MWCNTs. The m-CNTs in combination with polycarboxylate superplasticizer show favorable dispersion stability in water, especially in cement pore solution, and exhibit more positive effects on mechanical behavior of cement composites. With the addition of 0.1 wt% m-CNTs, the flexural strength and compressive strength of cement mortars were increased by 37.1% and 17.4%, respectively. Microscopic examination shows that the well-dispersed c-CNTs and m-CNTs exhibit more effective crack-bridging behavior in cement matrix. Mercury intrusion porosimeter analysis verifies m-CNTs can bring about lower porosity and improve pore size distribution for cement composites, which is closely correlated with mechanical test results. This work paves an effective way to further use MWCNTs as nano-reinforcing materials in cement composites.

Stratified diffusion of HOD-D2O inside COOH- and NH2-functionalized multi-walled carbon nanotubes studied by NMR spectroscopy

Functionalized multi-walled carbon nanotubes (MWCNTs) are potential systems for drug delivery applications like cancer therapy. By using NMR spectroscopy, we have demonstrated that 99.8% deuterated water, confined at nanoscale, splits into several components which flow with different diffusion coefficients through MWCNTs having an average diameter of 15 nm. Remarkably, we have highlighted the effect of the functionalization of MWCNTs with COOH- and NH2-molecules on the diffusion of water inside MWCNTs. Our results show that the specific choice of molecules used to functionalize the external surface of MWCNTs allows direct control of the diffusion coefficient. Raman and XPS spectroscopy were used to characterize the structure of MWCNTs after functionalization with COOH- and NH2-.

Peeling behaviors of epoxy based multi-walled carbon nanotubes (MWCNTs) composites and surface deposited silver interface: A comparative study of MWCNTs with different diameter and surface functionalization

Incorporating nano fillers such as multi-walled carbon nanotubes (MWCNTs) into polymeric matrix can generate rough surface and transfer stress directly to improve adhesion of metal-polymer interfaces. However, the interfaces became more complicate to optimize the adhesion. In this work, the effects of MWCNTs with different surface chemical groups and different diameter on surface profile, wettability and adhesion were studied. The results showed that the adhesion was related to surface wettability when using pristine MWCNTs and this relationship was extinct after the MWCNTs were functionalized. Out of the intuition, the functionalization was not with perfect universality in improving adhesion. D peaks were expanded with the ID/IG and FWHM of A1 and A4 increased by dual functionalization from 0.33 to 0.62, 92.39 to 105.91 cm−1 and 0.49 to 1.63, 140.47 to 172.24 cm−1, respectively. We found that the adhesion of functionalized MWCNTs depended on multiple factors including surface roughness, wettability, the intrinsic mechanical property of MWCNTs, and stress distribution on MWCNT surface when combined with the surface enhanced Raman spectroscopy (SERS) results. This work will be inspiring for novel technology of metal-polymer interfacial modification.

Multiwalled Carbon Nanotubes: Matrix Nanostructured Composites as Electrode Materials for Supercapacitors

Herein, nanostructured composites (NSCs) based on multiwalled carbon nanotubes (MWCNTs) filled with the individual (IH) and mixed (MH) Ni/Co hydroxides nanoparticles are prepared and an influence of NSC morphology and texture on their electrical capacitance is considered. It is found that MWCNTs have a channel diameter (2−5 nm), external diameter (18−23 nm), and wall width (2−12 nm). In NSCs obtained by precipitation of hydroxides from chloride aqueous solutions in an alkaline medium, the filler particles are formed as nanocrystallites inside the channels as well as aggregates composed of crystallites (up to 10 nm in size) situated on the external MWCNT surface. These aggregates look like islands, 15−16 nm wide, and are at least 200 nm long. Functionalization via ozonation causes nontrivial effects of an increase in the size and anisometry of the MH crystallites. The dependence of the NSC electrical capacitance on the content of fillers appears to be extreme. The content in the range of 5−10 wt% which allows increasing the capacitance by 1.2 and 1.5 times as compared with that for MWCNTs is optimal for scanning rates of 80 and 10 mV s−1, respectively.

Structure-function integrated poly (aryl ether ketone)-grafted MWCNTs/poly (ether ether ketone) composites with low percolation threshold of both conductivity and electromagnetic shielding

In this work, a soluble poly (aryl ether ketone) with an azide-group (az-PAEK) was designed and synthesized, and poly (aryl ether ketone) was successfully grafted onto the surface of multi-walled carbon nanotubes (PAEK-g-MWCNTs) by [2 + 1] cycloaddition reaction between azide-group of az-PAEK and similar carbon-carbon double bond (CC) on MWCNTs. In addition, PAEK-g-MWCNTs were dispersed into semi-crystalline poly (ether ether ketone) (PEEK) matrix as fillers, the electrical conductivity, electromagnetic shielding performance, mechanical properties and thermal stability of PAEK-g-MWCNTs/PEEK composites with different filler contents were discussed. The results show that the excellent dispersion effect of PAEK-g-MWCNTs filler in PEEK matrix leads to the percolation threshold of conductivity and electromagnetic shielding of PAEK-g-MWCNTs/PEEK composites are only 0.372 vol% and 0.496 vol% respectively, which endows PAEK-g-MWCNTs/PEEK composites with extraordinary conductivity (1.123 S/cm) and electromagnetic shielding performance (36 GHz, 53.56 dB). At the same time, the mechanical properties (tensile strength of 118.2 MPa) and thermal stability (561 °C) of PAEK-g-MWCNTs/PEEK composite are enhanced, which is a kind of structure-function integrated composite with low percolation threshold of both conductivity and electromagnetic shielding.

Preparation of nanostructured PDMS film as flexible immunosensor for cortisol analysis in human sweat

This work proposed a novel and flexible immunosensor for highly selective and sensitive determination of cortisol in sweat. The flexible electrode was developed by transferring multi-walled carbon nanotubes (MWCNTs) film on polydimethylsiloxane (PDMS) substrate and subsequent electrochemical deposition of Au nanoparticles (AuNPs) on the MWCNTs surface. The obtained AuNPs/MWCNTs/PDMS electrode was then covalently immobilized with anti–cortisol monoclonal antibody (Anti-Cmab) and blocked with BSA. Scanning electron microscope confirmed that MWCNTs have been firmly combined with PDMS and AuNPs distributed uniformly on the surface of MWCNTs. The PDMS-based sensor possesses a good mechanical stability against stretching, bending and twisting, displaying stable electrochemical performance under deformation. After optimizing the analytical parameters, the developed immunosensor allowed a facile quantification of cortisol in the range of 1 fg/mL–1 μg/mL with a detection limit of 0.3 fg/mL. The cortisol immunosensor was further used to evaluate cortisol levels in human sweat, and the results corresponded closely with commercially available chemiluminescence immunoassay (CLIA) method. Results indicated that the new cortisol immunosensor could provide an effective tool for the noninvasive, point of care measurement of sweat cortisol levels and is promise to be a wearable biosensor for the healthy monitoring.

Development and Characterization of Integrated Nano-Sensors for Organic Residues and pH Field Detection.

Meeting global water quality standards is a real challenge to ensure that food crops and livestock are fit for consumption, as well as for human health in general. A major hurdle affecting the detection of pollutants in water reservoirs is the lapse of time between the sampling moment and the availability of the laboratory-based results. Here, we report the preparation, characterization, and performance assessment of an innovative sensor for the rapid detection of organic residue levels and pH in water samples. The sensor is based on carbonaceous nanomaterials (CNMs) coated with an intrinsically conductive polymer, polyaniline (PANI). Inverse emulsion polymerizations of aniline in the presence of carbon nanotubes (CNTs) or graphene were prepared and confirmed by thermogravimetric analysis and high-resolution scanning electron microscopy. Aminophenol and phenol were used as proxies for organic residue detection. The PANI/CNM nanocomposites were used to fabricate thin-film sensors. Of all the CNMs, the smallest limit of detection (LOD) was achieved for multi-walled CNT (MWCNT) with a LOD of 9.6 ppb for aminophenol and a very high linearity of 0.997, with an average sensitivity of 2.3 kΩ/pH at an acid pH. This high sensor performance can be attributed to the high homogeneity of the PANI coating on the MWCNT surface.

Poly(acrylated epoxidized soybean oil)‐modified carbon nanotubes and their application in epoxidized soybean oil‐based thermoset composites

AbstractPoly(acrylated epoxidized soybean oil) (PAESO) has been grafted on the surface of multiwalled carbon nanotubes (MWCNTs) by reversible addition–fragmentation chain‐transfer reaction (RAFT). MWCNTs–PAESO as reinforcement has been successfully applied to prepare epoxidized soybean oil/maleopimaric‐based thermosetting composites with good dispersion through probe ultrasonic treatment in ethyl acetate. Micromorphology analyses on composites by transmission electron microscopy and scanning electron microscopy show that MWCNTs–PAESO has better dispersion stability in both ethyl acetate and epoxy matrix and better interface bonding effect with cured matrix, resulting in more uniformly and separately dispersed behavior than hydroxylated multiwalled carbon nanotubes. Correspondingly, by the method of molecular dynamics simulation, it is verified that the nonbond energy and van der Waals force of CNTs–PAESO in solvent can be relatively reduced, and that CNTs–PAESO possesses higher binding energy with matrix compared with CNTsOH. Therefore, MWCNTs–PAESO and PAESO have synergistic enhancement on the mechanical properties of composites demonstrated by rheology testing and dynamic mechanical analysis. The appropriate amount of MWCNTs–PAESO loading at 0.15 wt% can increase the glass transition temperature (Tg) of thermoset from 83.8 to 96.3°C, resulting in the improvement of both mechanical and thermal properties. These results show that surface‐grafting MWCNTs with homologous polymer can effectively increase the interfacial compatibility between matrix and MWCNTs, thereby improving the thermal and mechanical properties of composites.

Enhancing the dispersibility of multiwalled carbon nanotubes within starch-based films by the use of ionic surfactants

The incorporation of carbon-based nanomaterials into biopolymer matrix, to provide mechanical reinforcement and to obtain electrically conductive bionanocomposites, requires the homogeneous dispersion of the fillers. Herein, it is investigated the influence of surfactant structures on the dispersibility of multiwalled carbon nanotubes (MWNT) within starch matrix. Three different ionic surfactants, sodium dodecyl sulphate (SDS), cetyltrimethylammonium bromide (CTAB) and sodium cholate (SC), are employed to disperse the MWNT. Films with MWNT-SC show better dispersibility and an increase of about 75% of tensile strength and 60% of Young's modulus compared with films using MWNT-SDS and MWNT-CTAB. Nevertheless, MWNT functionalized with CTAB impart the highest values of antioxidant activity (scavenging activity around 30% in 1.5 h) and electrical conductivity (σ =14.75 S/m) to starch matrix. The properties of starch-based films can be tailored according to the physical adsorption of each surfactant on MWNT surface and/or the interfacial interaction of the surfactant with starch chains.

Puncture resistance of STF impregnated MWCNTs-grafted carbon fabrics

In this study, STF with the silica concentration of 20 wt% was fabricated. Functionalized multi-walled carbon nanotubes (MWCNTs) were chemically bonded onto the carbon fibers by using grafting technique. In grafting technique, DMF/PAN fiber/MWCNTs suspension sprayed onto each surface of carbon fabric and MWCNTs were grafted by a thermal treatment at 250 °C. Neat and MWCNTs-Grafted carbon fabrics were impregnated with STF with the silica loading of 20 wt%. Then, dynamic and quasi-static puncture resistance of neat, STF impregnated, MWCNTs-Grafted and MWCNTs-Grafted-STF impregnated carbon fabrics were examined. STF impregnation was detected to lead to a decrease in dynamic puncture resistance and an increase in quasi-static puncture resistance. Dynamic puncture resistance of MWCNTs-Grafted carbon fabric was found to be less than neat fabrics due to larger gaps between yarns occurred after thermal stabilization. Also, due to the greater gap between yarns, complete perforation occurred at lower penetration depth in MWCNTs-Grafted carbon fabrics than neat carbon fabrics in quasi-static puncture tests.

Electropolymerization of molecularly imprinted polypyrrole film on multiwalled carbon nanotube surface for highly selective and stable determination of carcinogenic amaranth

A novel amaranth electrochemical sensor was produced by electrodepositing a molecularly imprinted polypyrrole film in the presence of amaranth on a multi-walled carbon nanotube (MWCNT) surface. Template molecules were completely eluted through an innovative strategy that only requires the application of a fixed electrical potential in a blank phosphate buffer solution. Obviously, this strategy is much faster and more eco-friendly. The molecularly imprinted polymer (MIP)-based electrochemical sensor was systematically investigated by scanning electron microscopy, atomic force microscopy, X-ray diffraction, cyclic voltammetry, and electrochemical impedance spectroscopy. The resultant MIP/MWCNT modified glass carbon electrode (MIP/MWCNT/GCE) shows satisfactory electroactive surface area and charge transfer resistance. As expected, the electrochemical response signals were significantly amplified at the MIP/MWCNT/GCE. Under optimal conditions, the proposed MIP/MWCNT/GCE exhibits extraordinarily good analytical performance for amaranth detection, with two wide detection ranges (0.007 μM to 1.0 μM, and 0.40 μM to 17 μM) and detection possible down to 0.4 nM. Moreover, the polypyrrole MIP films show high binding affinity and specifically identifies amaranth molecules, enabling the robust detection of amaranth in a complicated matrix with excellent selectivity, reproducibility, and stability. The proposed sensor achieves accurate detection of amaranth concentration in various fruit drinks with acceptable recovery.

Functionalization of Multi-Walled Carbon Nanotubes Using Microwave Method

Multi-walled carbon nanotubes (MWCNTs) probably hold with each other and agglomerated due to van der Waals force. Functionalized process was used to reduce its ability to agglomerate and to increase dispersion in solution. The present work is focused on the microwave irradiation in order to achieve rapid functionalization of MWCNTs compared with other known techniques. The power of microwave radiation was selected by investigating the structural integrity of the samples by X-ray diffraction (XRD) and Field Emission Scanning Electron Microscopy (FE-SEM), while BET surface area measurement was used to measure the MWCNT surface area before and after treatment. The dispersion test in the solution was performed to determine the separation capability of untreated MWCNTs and f-MWCNTs.

MnOx bound on oxidized multi-walled carbon nanotubes as anode for lithium-ion batteries

Nanocomposites of manganese oxides and carbonaceous materials with strong interfacial connection hold extraordinary potential as high-performance electrode materials for energy storage devices. However, the interfacial interaction between manganese oxides and carbon has not been sufficient elucidated despite it may affect the chemical composition and morphology of the electrode materials and thus impact on the electrochemical performance. Herein, through regulating the amount of oxygen-containing functional groups on the surface of multi-walled carbon nanotubes (MWCNTs), a series of MnOx/MWCNTs nanocomposites with different compositions and morphologies are successfully synthesized. The Mn–O–C bonds, which can act as an ultrafast electron transfer path, are formed in the MnOx/MWCNTs nanocomposites. The influence of the amount and type of oxygen-containing functional groups in MWCNTs on the formation of Mn–O–C bonds, the composition and morphology of the nanocomposites is revealed clearly. The nanocomposite with the highest number of Mn–O–C bonds in the prepared MnOx/MWCNTs, which feature a structure with the binary manganese oxides (38% MnO2 and 62% Mn3O4) nanosheets growing vertically and uniformly on the oxidized MWCNTs, give the best electrochemical properties with high capacity (1353.2 mAh g−1 at 0.1 A g−1), outstanding rate capability (384.9 mAh g−1 at 20 A g−1), and durable long-term cyclability (1000 cycles with 70% retention at 2 A g−1). The quantitative kinetic analysis indicates that over 60% of the charge storage is pseudocapacitive. The distinct interfacial design strategy presents a new route to synthesis transition metal oxides/carbon hybrids with efficient energy storage and conversion.

Phosphate recovery from aqueous solution through adsorption by magnesium modified multi-walled carbon nanotubes

In this study, multi-walled carbon nanotubes modified by magnesium (Mg@CNT) was prepared as a novel adsorbent to recover phosphate from wastewater. Mg@CNT with the mass ratio of 0.48 (Mg versus MWCNTs) was the most efficient for phosphate adsorption and the maximum experimental adsorption capacity was up to 198 mg P/g. The Mg@CNT characterization was done by Field emission scanning electron microscope coupled with energy-dispersive spectroscopy detector (FESEM-EDS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), surface area analyzer (BET), Transmission electron microscope coupled with energy-dispersive spectroscopy detector (TEM-EDS). The MgO nanoflakes spread on the surface of multi-walled carbon nanotubes and reacted with phosphate to generate Mg3(PO4)2·10H2O as the end product. Phosphate adsorption on Mg@CNT was chemisorption onto heterogeneous surface according to the kinetic model and isotherm model fitting results. Several common co-existing ions, e.g., Cl−, NO3− and humic acid, had no obvious negative impact on the phosphate adsorption capacity; while SO42− and CO32− expressed stronger negative impacts and led to 13.2% and 39.5% decrease in phosphate adsorption capacity, respectively. After five adsorption-desorption cycles, Mg@CNT still maintained more than 80% adsorption capacity of the initial and high phosphate desorbability. These results implied that Mg@CNT possessed great application potential in phosphate recovery.

Different functional groups functionalized hexagonal boron nitride (h-BN) nanoparticles and multi-walled carbon nanotubes (MWCNT) for hydrogen storage

The hexagonal boron nitride (h-BN) functionalized with p-phenylenediamine, multi-walled carbon nanotubes (MWCNT) functionalized with carboxyl and acylchloride groups, and h-BN-Ph-NH-CO-MWCNT structure were produced by coupling, oxidation, acylation and amide formation reactions under various conditions and then, characterized by Brunauer-Emmett-Teller (BET), Fourier transform infrared spectroscopy-Attenuated total reflectance (FTIR-ATR), thermogravimetric and differential thermal analysis (DTA/TG), X-ray diffraction (XRD), and scanning electron microscopy (SEM) instruments. The hydrogen storage capacities of the samples were measured as a function of pressure at different temperatures. The h-BN and MWCNT surfaces were successfully modified. BET surface area of h-BN increased with the modification while those of other MWCNTs except for MWCNT-COCl (COCl: acylchloride group) decreased. While the hydrogen storage capacity of h-BN increased with the modification parallel to the BET surface areas of the samples, the hydrogen storage capacity of MWCNT varied depending on the BET surface area and functional group. The MWCNT-COCl had the highest hydrogen storage capacity. The samples had higher hydrogen storage capacity at the cryogenic temperature. Hydrogen adsorption isotherms conformed to Henry's law at room temperature and showed multi-layer adsorption behavior at cryogenic temperature. Hydrogen storage capacity of the samples increased with increasing pressure. Adsorption-desorption isotherm curves at cryogenic temperature were quite compatible with Type IV isotherm. The results show that the functionalization and especially the acyl group play an important role in increasing the hydrogen storage capacity of h-BN and MWCNT.

Activation of peroxydisulfate by carbon nanotube for the degradation of 2,4-dichlorophenol: Contributions of surface-bound radicals and direct electron transfer

Carbon materials have been used to activate peroxydisulfate (PDS) for the degradation of organic pollutants. The mechanism involved, especially whether radicals are formed in these processes, is still under debate. In this research, multi-walled carbon nanotube (MWCNT) was employed to activate PDS for the removal of 2,4-dichlorophenol (2,4-DCP). The effects of solution pH, PDS concentration, 2,4-DCP concentration, and MWCNT loading on the degradation of 2,4-DCP were investigated. The mechanism was explored via radical scavenging experiments, electron paramagnetic resonance (EPR) and MWCNT surface characterization. The results showed that the rate of 2,4-DCP degradation increased with the increasing solution pH, PDS concentration and MWCNT loading. The presence of OH and SO4− signals in EPR studies, no inhibitory effect in radical scavenging experiments, and the chlorination of MWCNT observed by X-ray photoelectron spectroscopy (XPS) suggested that surface reactions involving both surface-bound radicals and direct electron transfer were responsible for 2,4-DCP degradation. Reusability tests showed that the surface sites responsible for surface-bound radical formation were poisoned after PDS activation, while those responsible for direct electron transfer remained active after five cycles. This research provided the first in-depth insights for the dual roles of MWCNT in the PDS activation process.

Enhancing the Surface Properties and Structure of MWNTs by Effective Ion Beam Irradiation

The effects of irradiating multiwalled carbon nanotubes (MWNTs) with 100 keV He ions on the surface morphology were examined. Due to irradiation effects, the tube diameter reduced as revealed by scanning electron microscopy (SEM). Raman spectroscopy was used to investigate MWNTs by analyzing the principal bands in the spectra of virgin and radiated MWNT specimens. The effects of irradiation fluences on the disorder (D-band) and the graphite (G-band) modes were investigated. The possibility and prospects of using ion irradiation for controlling the wettability of the MWNT surface were investigated. The irradiation facility produces an MWNT coating that is either hydrophobic or hydrophilic to certain liquids. This analysis demonstrates that ion beam irradiation could be used as an alternative tool to change the structure of CNT and enhancing their wettability application, especially in water treatment. According to Raman spectra, when the fluence increases, the MWNTs become disordered due to the defect produced. The amorphous state of MWNTs could be attained with greater ion irradiation fluences.