Recent studies in nanopiezotronics have indicated that strained graphene may exhibit abnormal flexoelectric and piezoelectric properties. Similar assumptions been made with regard to the properties of carbon nanotubes (CNTs), however, this has not so far confirmed. This paper presents results our experimental confirming occurrence a surface effect multi-walled CNTs under non-uniform strain. Using atomic force microscopy, we demonstrated response compression bending. The current generated by...

Using PFM, it is shown that aligned carbon nanotubes have abnormally large piezoelectric strain coefficient of 203 ± 18 pm V⁻¹. The properties CNTs can cause a significant decrease in conductivity and hysteresis <italic>I–V</italic> characteristics.

Recent studies reveal that carbon nanostructures show anomalous piezoelectric properties when the central symmetry of their structure is violated. Particular focus given to nanotubes (CNTs) with initial significant curvature graphene sheet surface, which leads an asymmetric redistribution electron density. This paper presents results on aligned multi-walled CNTs. An original technique for evaluating effective coefficient CNTs presented. For first time, in this study, we investigate influence...

The creation of sustainable power sources for wearable electronics and self-powered systems is a promising direction modern electronics. At the moment, search functional materials with high values piezoelectric coefficient elasticity, as well non-toxicity, underway to generate such sources. In this paper, nitrogen-doped carbon nanotubes (N-CNTs) are considered material nanogenerator capable converting nanoscale deformations into electrical energy. effect defectiveness geometric mechanical...

The piezoelectric effect in non-uniform strained carbon nanotubes (CNTs) has been studied. It is shown that the magnitude of CNTs surface potential depends on a strain value. established resistance CNT also and internal electric field, which leads to hysteresis current-voltage characteristics. Analysis experimental studies with diameter 92 nm height 2.1 μm allowed us estimate coefficient 0.107 ± 0.032 C/m2.

This paper reports the results of influence energy laser pulses during ablation on morphology and electro-physical properties LiNbO3 nanocrystalline films. It is found that increasing pulse from 180 to 220 mJ in concentration charge carriers films decreasing 8.6 × 1015 1.0 1013 cm−3, with mobility 0.43 17.4 cm2/(V·s). In addition, experimental studies sublayer material effects geometric parameters carbon nanotubes (CNTs) are performed. lower electrode has a significant effect formation CNTs....

Recent studies have shown that nitrogen doping of carbon nanotubes (CNTs) can lead to the formation piezoelectric properties in them, not characteristic pure CNTs. In this work, nitrogen-doped CNTs were grown by plasma-enhanced chemical vapor deposition and effect aspect ratio nanotube length its diameter on coefficient [Formula: see text] was shown. It observed as increased from 7 21, value linearly 7.3 10.7 pm/V. This dependence is presumably due an increase curvature-induced polarization...

We have created an ionization type Vacuum gauge with sensor element based on array of vertically aligned carbon nanotubes. Obtained asymmetrical current-voltage characteristics at different voltage polarity the electrode CNTs. It was found that when applying a negative potential CNTs, current in gap is higher than positive potential. In pressure range 1 ÷ 103 Torr vacuum sensitivity 6 mV/Torr (at 4.5·10-5 A) and 10-5 10 1.3·10-5 A). shown energy efficiency can be increased case where CNT...

The paper presents a theoretical model of the catalytic centers formation processes during annealing multilayer nanosized metal films for carbon nanotubes growth. approach to description is based on mass transfer under influence mechanical thermoelastic stresses, which arise due difference in thermal expansion coefficients substrate materials and layers. stress gradient resulting from creates drop chemical potential over thickness film structure. This leads initiation diffusion between inner...

The results of experimental studies the dependence memristor effect bundles vertically aligned carbon nanotubes on pressing force magnitude and switching voltage are presented. improvement is shown with increasing voltage. surface potential deformation located along bundle cross section shown. obtained can be used in development promising nanopiezotronics devices.

The chemical composition and stoichiometry of vertically aligned arrays nitrogen-doped multi-walled carbon nanotubes (N-CNTs) were studied by photoelectron spectroscopy using laboratory synchrotron X-ray sources. We performed careful deconvolution high-resolution core-level spectra to quantify pyridine/pyrrole-like defects in N-CNTs, which are a key factor the efficiency piezoelectric response for this material. It is shown that XPS method makes it possible estimate concentration type...

Model of the resistive switching in vertically aligned carbon nanotube (VA CNT) taking into account processes deformation, polarization and piezoelectric charge accumulation have been developed. Origin hysteresis VA CNT-based structure is described. Based on modeling results VACNTs-based has created. The ration resistance high-resistance to low-resistance states amounts 48. correlation with experimental studies shown. can be used development nanoelectronics devices based CNTs, including...

We studied the influence of synthesis temperature on geometric parameters and structural perfection for vertically aligned carbon nanotubes (VACNT).We established that a synthetic 750 • C allows one to obtain lowest concentration defects in VACNT, with diameter 44±3 nm height 80±9 nm.When is increased up 800 C, an increase VACNT dimensions was observed, which may be due catalytic centers (CCs) migration rate their integration into larger centers.Also, at violation bonds during acceleration...

The resistive switching of vertically aligned carbon nanotube (VA CNT) by the action a compressive strain is shown. memory cell based on compressed VA CNT has been created. Origin strained described. It shown associated with redistribution deformation and corresponding piezoelectric charge in nanotube. ration resistance high-resistance to low-resistance states amounts 7 at voltage reading 0.2 V. results can be used development nanoelectronics devices CNTs, including random-access memory.