Multiwalled Carbon Nanotube Films Research Articles

Anisotropic Electrical Conductivity and Isotropic Seebeck Coefficient Feature Induced High Thermoelectric Power Factor >1800 µW m−1 K−2 in MWCNT Films

AbstractLightweight and low‐cost flexible thermoelectric (TE) materials improve the heat‐to‐electricity conversion efficiency compared to rigid materials by minimizing the heat loss between TE devices and heat sources in waste heat recovery. Multi‐walled carbon nanotube (MWCNT) has excellent mechanical and electrical properties. However, the TE power factor (PF) of MWCNTs is much lower than single/double‐walled carbon nanotube (S/DWCNT), which is often lower than 40 µW m−1‐K−2. Herein an effective way to achieve high PFs of ≈1800 µW m−1‐K−2 for p‐type and ≈1000 µW m−1‐K−2 for n‐type in flexible MWCNT films is reported. The high power factor is achieved by taking advantage of the anisotropic electrical conductivity and isotropic Seebeck coefficient feature of 1D CNTs as well as the following doping and cold‐pressing to improve the electrical conductivity of MWCNT films. The PF values are comparable to that of state‐of‐the‐art S/DWCNT films and most inorganic TE materials. A Lego‐like TE generator (TEG) with an assembling structure is fabricated to show the heat‐to‐electricity ability of the materials, which exhibits the highest areal output power of ≈27 W m−2 among CNT‐based flexible TEGs. This method may be extended to other 1D‐material based composites to boost the development of high PF flexible TE materials.

Multifunctional hybrid films from sudan III and multiwalled carbon nanotubes: electrical conduction and photoinduced molecular orientation

Multifunctional materials (MFMs) can be an important system because of their capacity to combine different properties useful for electronic devices. Multiwalled carbon nanotubes (MWCNTs) and azobenzene derivate Sudan III (SIII) are compounds with great potential to form this type of system. These compounds exhibit properties of electrical conduction and photoinduced molecular orientation, respectively, which can be combined in a single film-shaped system. In this study, we report on the fabrication and characterization of multifunctional hybrid films created from SIII mixed with MWCNTs via both Langmuir and Langmuir–Blodgett (LB) techniques. For SIII+MWCNTs monolayers obtained using the Langmuir technique, the surface pressure isotherms revealed that the aggregation process of pure SIII drives the formation of monolayers. Brewster angle microscopy of the monolayers indicated that MWCNTs form loop-shaped structures resembling rings. Such structures were not present in films of pure MWCNTs or pure SIII. The current–voltage characteristic curve showed that the films have an ohmic behavior associated to free electrons in MWCNTs, exhibiting conductivity on the order of that of semiconductors. The SIII+MWCNTs LB films exhibited a photoinduced molecular orientation determined via SIII photoisomerization. These processes, occurring in a single film, are the conceptual proof that these systems are MFMs with potential applications in developing hybrid devices.

IR absorptance of thin carbon multi-walled nanotubes layers

The IR transmittance and reflectance spectra of thin films which consist of multi-walled carbon nanotubes (MWCNT) are measured in the range from 2 to 17 μm. The MWCNT films of various thicknesses not exceeding 1.2 μm were deposited on silicon substrates with Si3N4/Al2O3 dielectric layers. It is shown that the deposition of an Al2O3 layer with a thickness of 2 nm allows to significantly improve the homogeneity and continuity of the MWCNT films. A technique is proposed for measuring the average thickness of rough MWCNT films by means of atomic force microscopy after laser engraving. Suggested method of spectra processing allows to estimate the spectral dependence of the IR radiation absorptance in MWCNT films, which are diffusely scattering objects and have a large absorption coefficient.

Ion Dynamics at the Carbon Electrode/Electrolyte Interface: Influence of Carbon Nanotubes Types.

Electrochemical quartz crystal microbalance (EQCM) and AC-electrogravimetry methods were employed to study ion dynamics in carbon nanotube base electrodes in NaCl aqueous electrolyte. Two types of carbon nanotubes, Double Wall Carbon Nanotube (DWCNT) and Multi Wall Carbon Nanotube (MWCNT), were chosen due to their variable morphology of pores and structure properties. The effect of pore morphology/structure on the capacitive charge storage mechanisms demonstrated that DWCNT base electrodes are the best candidates for energy storage applications in terms of current variation and specific surface area. Furthermore, the mass change obtained via EQCM showed that DWCNT films is 1.5 times greater than MWCNT films in the same potential range. In this way, the permselectivity of DWCNT films showed cation exchange preference at cathode potentials while MWCNT films showed anion exchange preference at anode potentials. The relative concentration obtained from AC-electrogravimetry confirm that DWCNT base electrodes are the best candidates for charge storage capacity electrodes, since they can accommodate higher concentration of charged species than MWCNT base electrodes.

Determination of Melatonin Using a New Integrated Electrochemical Platform of Functionalized Multi-Walled Carbon Nanotubes and Gold Nanoparticles for Clinical Applications

This work reports the characterization and application of a new electrochemical platform modified with gold nanoparticles (AuNP) and functionalized multi-walled carbon nanotubes (f-MWCNT) film to determine melatonin (MEL). MEL is a critical sleep inductor neurohormone, categorized by Food and Drug Administration (FDA, USA) as a nutritional supplement. The AuNP were synthesized and stabilized by 3-n-propyl-(4-methylpyridinium) silsesquioxane chloride (Si4Pic+Cl−), presenting an electrostatic stabilization and a material with a positive surface charge. Thermogravimetric analysis (TGA), Fourier transform-infrared spectroscopy (FT-IR), Raman spectroscopy, and zeta (ζ) potential indicated the insertion of oxygenated functional groups and a superficial negative charge for f-MWCNT. The GCE/f-MWCNT-AuNP-Si4Pic+Cl− platform showed an electrocatalytic profile and a current increase of ca. 7.5 times. Voltammograms were obtained by square wave voltammetry (SWV); the current increased with successive additions of MEL in the linear range of 4.9 to 55.5 μmol l−1. The values of LOD and LOQ were 1.6 and 4.7 μmol l−1, respectively. The standard addition was used to quantify MEL in simulated saliva, blood serum, and urine samples. Statistical tests showed no significant differences between the data collected by voltammetry and the comparative technique, molecular absorption spectrometry. It can be concluded that the new method provides novel perspectives for MEL sensing.

Field emission energy distribution studies of single multi-walled carbon nanotube emitter with gas adsorptions

The field emission electron energy distribution (FEED) investigation on the individual carbon nanotube (CNT) is a powerful approach to study the intrinsic electronic properties, including the work function and field emission energy level, for CNT devices. We fabricated the single multi-walled carbon nanotube (MWNT) emitter by the solution evaporation dielectrophoretic process after the chemical vapor deposition (CVD) synthesis of the MWNT film. The FEED properties of the MWNT emitter in hydrogen and nitrogen environments were investigated. The FEED peaks shifted up gradually in both hydrogen and nitrogen ambiences, indicating the effective work function reduction effect with gas adsorptions. The amounts of spectrum displacements increased with raising gas partial pressures, with larger displacements of up to 0.65 eV for hydrogen between 10−7 Pa and 10−4 Pa. The double peak spectra imply that emission electrons could be from the hexagonal and the pentagonal carbons. Meanwhile, high carbon content was detected in the ultimate vacuum, attributed highly to the MWNT etching from the emission. This investigation suggests that the work function variation plays key role for the field emission instability and the pressure sensing effect of CNT emitters.

The influence of zinc phthalocyanine on the formation and properties of multiwalled carbon nanotubes thin films on the air–solid and air–water interface

The influence of zinc phthalocyanine (PC) on the formation and properties of multiwalled carbon nanotube (MWCNT) Langmuir films was studied. The mixtures of PC and MWCNT at different concentrations were prepared and used to obtain films on the air–solid and air–water interface. The excess Gibbs energy, excess areas and the area fraction covered by the mixtures components were determined for mixed systems at various surface pressures. For the mass fractions of MWCNT lower than 0.9, the interactions between the mixture components were attractive, while for the MWCNT mass fractions higher than 0.9, they were repulsive. Analysis of the area fractions and fluorescence images revealed three stages of filling the MWCNT films with PC. In the first stage, the PC filled the area between the MWCNT and started to form inclusions in the MWCNT film structure. In the second stage, gradual increase in the PC inclusion size with increasing PC concentration was observed. In the third stage, continuous PC films were formed. These observations were further confirmed by the calculation of electrical percolation threshold.

Optimization of thin polystyrene waste embedded multiwall carbon nanotubes (MWCNT) film for solid electrolyte of flexible dye-sensitized solar cell (DSSC)

The consumption of organic solvent in a conventional liquid-based electrolyte give rise to the solvent’s evaporation, hermetic sealing of the cell as well as lack of cell durability. In order to avoid fluidity and potential leakage, the composite polymer-based electrolyte has been investigated. Thus, the main objective of this study is to develop thin polystyrene waste embedded multiwall carbon nanotube (MWCNT) film with improving electrochemical properties as electrolyte host for flexible DSSC application. In this study, the MWCNT will be functionalized with carboxyl group using sulfonitric solution. Transmission electron microscope (TEM) were used to evaluate the morphology of MWCNT. Different weight percentage of the functionalized MWCNT were embedded into the polystyrene and their effect on the morphology, and uniformity of the thin polymer films were analysed using field emission electron microscope (FESEM). The electrochemical properties of the prepared polystyrene embedded MWCNT based polymer electrolyte were studied using electrochemical impedance spectroscopy (EIS). The finding shows that the optimum loading of MWCNTs in the thin polystyrene waste embedded MWCNTs film is 0.003 g. These composition exhibits the highest ionic conductivity and the lowest resistance. Further increase in the amount of MWCNTs results in reducing the ionic conductivity due to the percolation network of the MWCNT with the polystyrene.

Analysis of growth temperature variation and different catalysts on the morphology of synthesized carbon nanotubes

This paper reports the effect of growth temperature (i.e., 750 °C, 800 °C, and 850 °C) and catalysts (iron (Fe) and nickel (Ni)) on the synthesis of carbon nanotubes. X-ray diffraction (XRD) technique, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Raman spectroscopy is used to study the morphological properties of synthesized carbon-nanotubes. It was observed from SEM results that longer, straight and clean nanotubes with lesser defect density are synthesized when iron is used as catalyst at higher growth temperature. Raman spectroscopy result shows that the defect density decreases with the increase in growth temperature. TEM images revealed that crystalline multi-walled carbon nanotubes were grown at higher growth temperature for iron as catalyst. The electrochemical performance of synthesized thin films of multi-walled carbon nanotubes as active supercapacitor electrodes evaluated using cyclic voltammetry and is 61 F/g.

Extreme mechanical anisotropy in diamond with preferentially oriented nanotwin bundles

Mechanical properties of covalent materials can be greatly enhanced with strategy of nanostructuring. For example, the nanotwinned diamond with an isotropic microstructure of interweaved nanotwins and interlocked nanograins shows unprecedented isotropic mechanical properties. How the anisotropic microstructure would impact on the mechanical properties of diamond has not been fully investigated. Here, we report the synthesis of diamond from superaligned multiwalled carbon nanotube films under high pressure and high temperature. Structural characterization reveals preferentially oriented diamond nanotwin bundles with an average twin thickness of ca. 2.9 nm, inherited from the directional nanotubes. This diamond exhibits extreme mechanical anisotropy correlated with its microstructure (e.g., the average Knoop hardness values measured with the major axis of the indenter perpendicular and parallel to nanotwin bundles are 233 ± 8 and 129 ± 9 GPa, respectively). Molecular dynamics simulation reveals that, in the direction perpendicular to the nanotwin bundles, the dense twin boundaries significantly hinder the motion of dislocations under indentation, while such a resistance is much weaker in the direction along the nanotwin bundles. Current work verifies the hardening effect in diamond via nanostructuring. In addition, the mechanical properties can be further tuned (anisotropy) with microstructure design and modification.

Concentration dependent debundling and single tube dispersions of pristine multiwalled carbon nanotubes functionalized with double tail phospholipids

Multiwalled carbon nanotubes (MWNTs) exist as aggregates of highly entangled tubes due to large aspect ratios and strong Van der Waals interactions among them in their native states. In order to render them suitable for any application, MWNTs need to be separated and dispersed uniformly in a solvent preferably as individual tubes. In the present work, it is demonstrated that a double tail lipid such as 1, 2-dipalmitoyl-sn-glycero-3-phosphoethanolamine (DPPE) is capable of dispersing MWNTs in ethanol. Ultra-stable suspensions were obtained by optimizing two key parameters: DPPE to MWNT weight ratio (ε) and MWNT concentration (c). Stability of the suspensions increased with the increasing ε value up to an optimum point (ε = 1.8) and then decreased drastically beyond that. CNT dispersions with ε = 1.8 were extremely stable (with a Zeta potential of 108.26 ± 2.15 mV) and could be retained in suspended form up to 3 months. Effect of MWNT concentration on disaggregation was very significant and stable suspensions could be formed for MWNT concentrations only below 0.14 mg ml−1. Above this concentration, no stable dispersions could be obtained even with ε = 1.8. Compression isotherms of Langmuir monolayers of the DPPE functionalized MWNTs spread at the air water interface were highly repeatable, suggesting that the MWNTs in dispersion were present as separate tubes coated with phospholipids. SEM micrographs of the Langmuir–Blodgett (LB) films, deposited at high surface pressures on silicon wafers, show that MWNTs remain as single nanotubes with no signs of reaggregation. TEM micrographs of MWNT suspensions indicated random adsorption of DPPE on MWNTs. Our work makes it possible to explore potential applications of LB films of MWNTs (stabilized by DPPE) in the development of conducting thin films for sensor applications or as supports to immobilize catalysts for heterogenous reactions.

Retraction of “Construction of a Flexible Nb2O5/Carboxyl Multiwalled Carbon Nanotube Film as Anode for Lithium and Sodium Storages”

ADVERTISEMENT RETURN TO ISSUEPREVRetractionNEXTORIGINAL ARTICLEThis notice is a retraction.Retraction of “Construction of a Flexible Nb2O5/Carboxyl Multiwalled Carbon Nanotube Film as Anode for Lithium and Sodium Storages”Jinwei KangJinwei KangMore by Jinwei Kang, Huiwen ZhangHuiwen ZhangMore by Huiwen Zhang, Ziyi ZhanZiyi ZhanMore by Ziyi Zhan, Yuqi LiYuqi LiMore by Yuqi Li, Min Ling*Min LingMore by Min Linghttps://orcid.org/0000-0001-6727-9585, and Xuehui Gao*Xuehui GaoMore by Xuehui Gaohttps://orcid.org/0000-0003-3029-1577Cite this: ACS Appl. Energy Mater. 2021, 4, 10, 11898Publication Date (Web):October 14, 2021Publication History Published online14 October 2021Published inissue 25 October 2021https://doi.org/10.1021/acsaem.1c02985Copyright © 2021 American Chemical SocietyRIGHTS & PERMISSIONSArticle Views308Altmetric-Citations-LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (476 KB) Get e-Alerts Get e-Alerts

Detection of formic acid and acetic acid gases by a QCM sensor coated with an acidified multi-walled carbon nanotube membrane

ABSTRACT In this paper, the acidified multi-walled carbon nanotubes (MWCNTs) film was coated on the quartz crystal microbalance (QCM) to prepare a high-performance sensor for the real-time detection of organic acid gases. The material characteristics of the thin films were analysed by field emission scanning electro microscopy (FESEM), Raman spectra and X-ray photoelectron spectroscopy (XPS). The organic acid vapours’ sensing results indicated that acidized-MWCNTs thin film exhibited good frequency response, repeatability, reversibility and stability. There is a clear linear relationship between the frequency offset and the organic acid vapours with concentration below 5.0 ppm, and the detection limit of 0.77 and 0.73 ppm for formic and acetic acid vapours, respectively. The sensor shows the highest response to formic acid vapour than acetic acid vapour which may be ascribed to molecular polarity. Furthermore, a sensing mechanism model was introduced to understand the adsorption reaction between organic acid molecules and acidized-MWCNTs. This paper proves that acidized-MWCNTs is a potential and suitable material for organic acid vapour detection when combined with a QCM sensor.

Fabrication and Supercapacitor Applications of Multiwall Carbon Nanotube Thin Films

Multiwalled carbon nanotubes (MWCNTs) are a one-dimensional nanomaterial with several desirable material properties, including high mechanical tensile modulus and strength, high electrical conductivity, and good thermal conductivity. A wide variety of techniques have been optimized to synthesize MWCNTs and to fabricate thin films of MWCNTs. These synthesis and fabrication methods vary based on precursor materials, process parameters, and physical and chemical principals, and have a strong influence on the properties of the nanotubes and films. Thus, the fabrication methods determine the performance of devices that can exploit the advantageous material properties of MWCNTs. Techniques for the fabrication of carbon nanotubes and carbon nanotube thin films are reviewed, followed by a discussion of the use of MWCNTs as an electrode material for electrochemical double-layer supercapacitors (EDLCs). EDLCs feature high power density, excellent reversibility and lifetime, and improved energy density over electrolytic capacitors. Beyond surveying fabrication techniques previously explored for MWCNT electrodes, an alternative approach based on inkjet printing capable of depositing a small amount of active material is discussed. Such an approach allows for a high degree of control over electrode properties and can potentially reduce cost and active material waste, which are essential components to the gradual conversion to green energy.

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.

Cu-MWCNT Kompozitlerinin Yapısal Özellikleri

Bakır/bakır oksit/karbon nanotüp (Cu/CuO/CNT) kompozit ince filmler, elektroforetik biriktirme (EPD) yöntemine benzer şekilde hazırlanmıştır. Nanotüp filmler, SEM, EDAX, XPS, FTIR, Raman ile karakterize edilmiş ve filmlerin mikro yapısının, işlemde kullanılan çözücü, büyüme gerilimi ve tavlanmış sıcaklık bileşimi tarafından büyük ölçüde etkilendiği bulunmuştur. Kompozit yapılarda farklı tuzlu deiyonize su (KNO3, KCl, FeCl2) kullanılmakta ancak istenilen sonuç alınamamıştır. Bakır yüzeyinde daha kısa sürede daha fazla CNT birikmesi nedeniyle asetonla en iyi sonuçlar elde edilmiştir. Aseton/CNT solüsyonunda üretilen yapılarda oksit miktarının daha az olduğu görülmektedir.

Silver coated and filled carbon nanotubes: Synthesis, electrical and thermal properties, and iodine vapor sensing

Here we present a simple method to fill multiwalled carbon nanotubes (MWCNT) with silver. This method involves stirring of MWCTs in AgNO3 solution at room temperature in open air followed by heating in H2 atmosphere at 250 °C for two hours. Process also leads to small coating of Ag on the surface. We confirmed the presence of crystalline silver in both coating and filling in hybrid MWCNTs by high resolution transmission electron microscopy, energy dispersive X-ray spectroscopy and electron diffraction. After silver coating and filling, bulk thermal diffusivity and thermal conductivity of Ag hybrid MWCNTs were increased by 242% and 255%, respectively. Furthermore, current-voltage measurements using tuna probe in atomic force microscopy showed higher number of charge carriers in the Ag hybrid nanotubes compared to pristine MWCNTs which resulted in up to 173% increase in their electrical conductivity. The Ag hybrid MWCNT based sensor also showed rapid and reversible sensing for I2 vapors: bulk sensor film demonstrated sensing response of 45% in just ~60 s at room temperature. However, the sensor recovery was slower: after removal of I2 vapors source, the recovery took 400 s and required heating at 100 °C in air. Response and recovery of sensor film was maintained after repeated cycles of exposure. Finally, the Ag hybrid MWCNTs film displayed high stability and selectivity for I2 vapors.

Covalent Immobilization of Polyaniline Doped with Ag+ or Cu2+ on Carbon Nanotubes for Ethylene Chemical Sensing.

Multi-walled carbon nanotubes (MWCNTs) are promising materials for chemical gas sensing because of their high electrical and mechanical properties and significant sensitivity to changes in the local environment. However, high-content MWCNT films suffer from the low tunability of the electrical resistance, which is crucial for high chemoresistive sensing performance. This study reports the conjugation of MWCNTs and oligomers of polyaniline (PANI) doped with Ag+ or Cu2+ incorporated into a PVC/polyacrylate. MWCNTs were sonicated in n-methyl pyrrolidine (NMP), and PANI was conjugated via a 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide and an N-hydroxysuccinimide (EDC/NHS) process. MWCNT/PANI Ag+ or Cu2+ conjugates were doped to form a coordinate bond. The doped conjugates were successfully incorporated into the PVC/polyacrylate. These MWCNT/PANI conjugates doped were exposed to different concentrations of ethylene gas to examine their feasibility for ethylene detection.

Health monitoring of composite single lap joints with highly sensitive MWCNTs film sensors

In this paper, a method with highly sensitive multi-wall carbon nanotubes (MWCNTs) film sensors was put forward to evaluate the health condition of glass fiber-reinforced composite single lap joints in real time. With this method, the single lap joint fracture can be predicted when the resistance change rate reached 1.11% to 5.89% approximately. Meanwhile, for the single lap joints, the reality can be found that the farther distance was from the interface to different layers, the more easily defect might emerge under the force introduced in the interface plane. And the stress in the middle area of the interface for the joint was greater than that in the edge when it was stretched. The results of experiments indicated that the effectiveness of MWCNTs sensors to monitor the health condition of the single lap joints was confirmed.

Electrically Conductive Networks from Hybrids of Carbon Nanotubes and Graphene Created by Laser Radiation.

A technology for the formation of electrically conductive nanostructures from single-walled carbon nanotubes (SWCNT), multi-walled carbon nanotubes (MWCNT), and their hybrids with reduced graphene oxide (rGO) on Si substrate has been developed. Under the action of single pulses of laser irradiation, nanowelding of SWCNT and MWCNT nanotubes with graphene sheets was obtained. Dependences of electromagnetic wave absorption by films of short and long nanotubes with subnanometer and nanometer diameters on wavelength are calculated. It was determined from dependences that absorption maxima of various types of nanotubes are in the wavelength region of about 266 nm. It was found that contact between nanotube and graphene was formed in time up to 400 fs. Formation of networks of SWCNT/MWCNT and their hybrids with rGO at threshold energy densities of 0.3/0.5 J/cm2 is shown. With an increase in energy density above the threshold value, formation of amorphous carbon nanoinclusions on the surface of nanotubes was demonstrated. For all films, except the MWCNT film, an increase in defectiveness after laser irradiation was obtained, which is associated with appearance of C–C bonds with neighboring nanotubes or graphene sheets. CNTs played the role of bridges connecting graphene sheets. Laser-synthesized hybrid nanostructures demonstrated the highest hardness compared to pure nanotubes. Maximum hardness (52.7 GPa) was obtained for MWCNT/rGO topology. Regularity of an increase in electrical conductivity of nanostructures after laser irradiation has been established for films made of all nanomaterials. Hybrid structures of nanotubes and graphene sheets have the highest electrical conductivity compared to networks of pure nanotubes. Maximum electrical conductivity was obtained for MWCNT/rGO hybrid structure (~22.6 kS/m). Networks of nanotubes and CNT/rGO hybrids can be used to form strong electrically conductive interconnections in nanoelectronics, as well as to create components for flexible electronics and bioelectronics, including intelligent wearable devices (IWDs).