Activation of Wet-Pulled Carbon Nanotube Fibers for Electrochemical Detection of Dopamine

Dmitrieva V. A.; Fedorov F. S.; M. R. Chetyrkina; Novikov I. V.; Nasibulin A.

doi:10.1007/s41664-025-00350-5

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Activation of Wet-Pulled Carbon Nanotube Fibers for Electrochemical Detection of Dopamine

Journal of Analysis and Testing. 2025. Vol. 9. P. 399–404.

Dmitrieva V. A., Fedorov F. S., Chetyrkina M. R., Novikov I. V., Nasibulin A.

Carbon nanotube fibers (CNTFs) fabricated using a novel “wet-pulling” technique were evaluated for electrochemical detection of dopamine (DA). To enhance the sensitivity, we employed an electrochemical oxidation pretreatment and twisting of CNTFs and investigated the performance by cyclic voltammetry (CV) and chronoamperometry (CA). The synergetic effect of twisting and pre-oxidation boosted the sensitivity of modified CNTFs compared to the as-obtained CNTFs due to the introduction of new active sites for efficient trapping of DA molecules. For the oxidized twisted CNTFs, we achieved a sensitivity of 10.8 µA·µM–1·cm–2 and the limit of detection of 330 nM in the case of CV, and 6.4 µA·µM−1·cm−2 and 102 nM in the case of CA, respectively. The CNTFs showed good potential for an in vitro application, maintaining sufficient sensitivity under various conditions. When coupled with the suited mechanical properties of CNTFs, the results highlight the prospect of implantable and flexible sensors.

Research target: Chemistry

Language: English

DOI

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Keywords: carbon materials nanosensors sensors electrocatalysis Electrochemistry

Stress tensor of inhomogeneous flexible polymer chain solutions beyond the ground-state dominance approximation

Budkov Y., Journal of Chemical Physics 2026 Vol. 165 No. 9 Article 094902

We derive the stress tensor of a flexible polymer solution within the Gaussian-chain self-consistent field theory (SCFT) without invoking the ground-state dominance (GSD) approximation. Starting from a covariant formulation of the single-chain partition function in a background metric, we obtain the symmetric stress tensor expressed through the full Edwards propagators. The result contains the local ...

Added: September 2, 2026

Monometallic Ln3+ and heterometallic Ln3+–Cd2+ complexes based on pentafluorophenylacetic acid: efficient control of dimension and luminescent properties

Belousov Y., Кискин М. А., Sidoruk A. et al., Australian Journal of Chemistry 2022 Vol. 75 No. 9 P. 572–580

Four new complexes [Ln(pfaa)3(H2O)2]n (Ln = Eu (1), Tb (2)) and [Ln2Cd2(pfaa)10 (phen)2(EtOH)2]·2MeCN (Ln = Eu (3), Tb (4), phen = 1,10-phenanthroline) based on pentaphorphenylacetic acid (Hpfaa) have been prepared and completely investigated. The structures of compounds 1 and 3 were studied by single crystal X-ray diffraction analysis: the isostructural complexes 1 and 2 represent ...

Added: August 26, 2026

Understanding the electric double layer at electrode–electrolyte interfaces, Part III: crystallographic-face dependence of silver capacitance in aqueous NaF solutions

Mazur D., Petr E. Brandyshev, Doronin S. et al., Electrochimica Acta 2026 Vol. 577 Article 149729

The electric double layer (EDL) at a single-crystal metal surface is controlled not only by the electrolyte composition and the electrode potential, but also by the atomic structure of the surface itself. This makes the Ag(hkl)/NaF interface a stringent test for continuum theories of the EDL. In the third part of our series, we examine ...

Added: August 20, 2026

Hall effect in electrolyte solutions: Self-consistent Debye–Hückel–Onsager theory

Budkov Y., Kalikin N., Journal of Chemical Physics 2026 Vol. 165 Article 064506

A self-consistent statistical-mechanical theory of the Hall effect in electrolyte solutions is developed by extending the self-consistent Debye–Hückel–Onsager (SCDHO) framework to crossed electric and magnetic fields. The theory incorporates non-local ionic charge distributions via Slater-type form factors, regularizing the Coulomb interaction at short range, and accounts for dielectric friction through ion-specific coefficients, employing experimental values ...

Added: August 12, 2026

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Novikov A., New Journal of Chemistry 2026 Vol. 50 P. 13931–13957

The rational design of coinage metal nanocarriers requires a mechanistic understanding of metal-drug binding and predictive descriptors that translate molecular interactions into design rules. Using DFT (B3LYP-D3BJ/def2-TZVP, SMD water), we systematically investigated the binding of 5-fluorouracil (5-FU) and levodopa (l-DOPA) to neutral and cationic homo- and heteronuclear dimers of Au, Ag, and Cu (Au2, Ag2, ...

Added: August 12, 2026

Surface-sulfonated Al₂O₃, CeO₂, and TiO₂ as functional fillers for Nafion-type gel polymer electrolytes for lithium metal batteries

Voropaeva D., S. Novikova, I. Stenina et al., Solid State Ionics 2026 Vol. 445 Article 117288

Composite gel polymer electrolytes based on a perfluorinated sulfonic acid cation-exchange MF-4SC membrane containing surface-sulfonated nanoparticles of aluminum oxide, cerium (IV) oxide, and titanium oxide (sAl2O3, sCeO2, and sTiO2, respectively) were prepared by casting from a dispersion in N,N-dimethylformamide and plasticized with a 1,3-dioxolane/1,2-dimethoxyethane mixture. The influence of the filler nature on ionic conductivity, solvent uptake, activation energy, lithium ...

Added: July 30, 2026

Long-range machine-learning potentials with environment-dependent charges enable predicting LO-TO splitting and dielectric constants

Korogod D., Shapeev A., Ivan S. Novikov, Physical Review B: Condensed Matter and Materials Physics 2026 Vol. 114 No. 2 Article 024104

We present two models with explicit long-range electrostatics in the form of Coulomb interactions. Both models include point charges depending on their local atomic environments, and the second model also conserves a total charge of an atomic system. We combine the proposed long-range models with the local moment tensor potential (MTP) and demonstrate that they ...

Added: July 22, 2026

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Moshkina E., Molokeev M., Zolotov A. et al., Journal of Alloys and Compounds 2026 Vol. 1077 Article 189412

A wide series of substitutions in a subsystem of small radii cations M = Al, Cr, Fe, Ga, Sc is possible in rare-earth borates ReM3(BO3)4 with the huntite structure. However, the existence of these compounds where M = Mn still raises doubts. The study presents a synthetic approach developed in the framework of the flux method allowing for the required ...

Added: June 29, 2026

Incorporating Scientific Knowledge into Neural Network Density Functionals

Schneider M., Zaripov D., Dokin R. et al., Journal of Chemical Theory and Computation 2026 Vol. 22 No. 9 P. 4405–4414

Density functional theory (DFT) is the workhorse of modern reactions and materials modeling. While the exact functional remains unknown, many approximations to it have been constructed either by hand-crafting functional forms to satisfy exact constraints or by machine learning. In this work, we show how both of these approaches can be fused to build both ...

Added: June 26, 2026

Electrodeposition and electrochromic properties of hydrated mixed oxides MoxW1-xO3·2H2O films

Laurinavichyute V., Levin E. E., Mironkova A. A. et al., Surfaces and Interfaces 2026 Vol. 81 Article 108389

In this work we characterize mixed Mo-W acidic deposition solutions with Mo content ranging from 0 to 100 mol.% by Raman and UV–Vis spectroscopy. The obtained distribution diagram of mixed isopolyanions allows one to explain the observed change in film deposition rate with increase in Mo content. It was found that the initial decrease in ...

Added: June 24, 2026

Impact of heat treatment on microstructure and mechanical properties of additively manufactured aluminum bronze

Filippova A. V., Yurchenko N. Y., Smirnov S. A. et al., Journal of Alloys and Compounds 2026 No. 1074 Article 189162

This study investigates the effects of post-processing heat treatment at 300–500 °C on the microstructure, hardness, and tensile properties of laser powder bed fusion (PBF-LB) processed Al-bronze processed with energy densities (ED) in the range of 125–938 J/mm3. In the as-printed state, sharp needle-like α + β′ laths form at lower ED whereas with increasing ED, the β′ ...

Added: June 12, 2026

DFT-guided charge-state engineering of gold clusters for levodopa recognition: fundamental principles for drug delivery applications

Obijiofor O., Novikov A., New Journal of Chemistry 2026 Vol. 50 No. 23 P. 9749–9768

Rational design of gold-based nanocarriers for neurotherapeutics requires atomic-scale understanding of drug-material interactions. Density functional theory calculations were performed to investigate levodopa (L-DOPA) adsorption on small gold clusters (Au2–Au4) with cationic, neutral, and anionic charges, with additional validation on a larger Au10 cluster using multiple low-energy isomers. Binding free energies (ΔGbind), charge transfer, and electronic descriptors ...

Added: June 3, 2026

Facile and Green Approach to Synthesize Biomass-Derived Zero-/Two-Dimensional Carbon Dots/g-C3N4 Heterojunction for Efficient Photocatalytic and Photoelectrocatalytic Applications

Das A., Saikia J., Maji N. et al., ChemNanoMat 2026 Vol. 12 No. 5 Article e202500733

Developing efficient photoactive materials from bio-derived resources is vital yet challenging for achieving effective water splitting performance. In this work, nano carbon dots (CDs) of zero-dimensional (0D) were synthesized from papaya peel through a simple and eco-friendly process and subsequently anchored onto the two-dimensional (2D) layered structure of graphitic carbon nitride (g-C3N4, GCN) at various ...

Added: June 2, 2026

Optimal Design of Copper-Doped ZnO Heterostructures for Photocatalytic and Photoeletrochemical Performance: A Combined Experimental and DFT Study

Wary R. R., Mahato B., Sharma N. et al., The Journal of Physical Chemistry Letters 2026 Vol. 17 No. 17 P. 5099–5107

Development of heterojunction materials is an efficient approach for enhancing photocatalytic and photoelectrochemical processes. We develop a ZnO/CuO heterojunction via Cu doping into a ZnO matrix. Structural characterization confirmed that Cu was effectively incorporated into ZnO without any structural changes. The improved optical properties and reduced charge carrier recombination of the doped samples were confirmed ...

Added: June 2, 2026

Synthesis of Rare 1,2,3-Triazolium-5-olates by Electrooxidative Cyclization of α‑Aminocarbonyl Hydrazones

Титенкова К., Турпаков Е. А., Чаплыгин Д. А. et al., Organic Letters 2025 Vol. 27 No. 17 P. 4434–4438

A new method for the synthesis of rare mesoionic heterocycles, namely, 1,2,3-triazolium-5-olates, via electrochemically induced intramolecular N–N bond formation was realized. The process involves electrooxidative cyclization of the readily available α-aminocarbonyl hydrazones, occurs under mild conditions, and enables the preparation of a diverse series of target mesoionics. Additionally, 1,2,3-triazolium-5-olates demonstrated high thermal stability (up to ...

Added: February 22, 2026

Multioxide combinatorial libraries: fusing synthetic approaches and additive technologies for highly orthogonal electronic noses

Gohel V. R., Chetyrkina M. R., Gaev A. et al., Lab on a Chip - Miniaturisation for Chemistry and Biology 2024

Added: February 10, 2026

Monitoring of meat quality and change-point detection by a sensor array and profiling of bacterial communities

Chetyrkina M. R., Analytica Chimica Acta 2024

Added: February 10, 2026

High Entropy (CoFeMnCuNiCr)3O4 Nanoparticles Anchored on Graphene-Based Supports for High-Performance Oxygen Evolution Electrocatalysis

Mehrabi-Kalajahi S., Ostovari Moghaddam A., Akbarpour S. et al., ACS Applied Energy Materials 2025 Vol. 8 No. 12 P. 8524–8531

High-entropy materials provide an interesting route for developing highly active electrocatalysts owing to their tunability and numerous active sites; however, their performance can be further improved with interfacial engineering in nanocomposite catalysts. In this study, (CoFeMnCuNiCr)3O4 high-entropy oxide (HEO) nanoparticles were synthesized and grafted onto graphene (HEO–G), graphene oxide (HEO–GO), and reduced graphene oxide (HEO–rGO) supports. ...

Added: June 16, 2025

A 3d-4d-5d High Entropy Alloy as a Bifunctional Oxygen Catalyst for Robust Aqueous Zinc–Air Batteries

He R., Yang L., Zhang Y. et al., Advanced Materials 2023 Vol. 35 No. 46 Article 2303719

High entropy alloys (HEAs) are highly suitable candidate catalysts for oxygen evolution and reduction reactions (OER/ORR) as they offer numerous parameters for optimizing the electronic structure and catalytic sites. Herein, FeCoNiMoW HEA nanoparticles are synthesized using a solution-based low-temperature approach. Such FeCoNiMoW nanoparticles show high entropy properties, subtle lattice distortions, and modulated electronic structure, leading to ...

Added: January 12, 2025

Machine Learning and Knowledge Discovery in Databases. Applied Data Science Track. European Conference, ECML PKDD 2024, Vilnius, Lithuania, September 9–13, 2024, Proceedings, Part X. LNCS, volume 14950

Cham: Springer, 2024.

This multi-volume set, LNAI 14941 to LNAI 14950, constitutes the refereed proceedings of the European Conference on Machine Learning and Knowledge Discovery in Databases, ECML PKDD 2024, held in Vilnius, Lithuania, in September 2024. ...

Added: November 22, 2024

Development of the Structural Diagram of the Electrodynamic Vibration Exciter Electronic Part

Aleksandr L. Tuv, Ivan D. Demidov, Maksim S. Akatov et al., , in: 2023 Seminar on Networks, Circuits and Systems (NCS).: IEEE, 2023. Ch. 39 P. 178–181.

Added: February 10, 2024

2023 Seminar on Networks, Circuits and Systems (NCS)

IEEE, 2023.

The IEEE Russia North West Section and Saint Petersburg Electrotechnical University “LETI” (SPbETU “LETI”) are pleased to present the Proceedings of the 2023 Seminar on Networks, Circuits and Systems. The Seminar will cover a broad area of issues related to computer and communication networks and systems, design and application of electronic components and devices, computer systems engineering and theory. ...

Added: February 10, 2024

Ion-Sensitive Three-Terminal Device as a Universal Hybrid Platform With TiO2 Nanowires on the Channel

Dalal A., Bebarta A., Paul A. D. et al., IEEE Sensors Journal 2023 Vol. 23 No. 3 P. 1917–1924

We developed a three-terminal ion-sensitive device (TTISD) as a proton (H+) and arsenic (As3+) sensor for the detection of glucose and As(III) dissolved in water. The TTISD was fabricated using the e-beam evaporation and glancing angle deposition (GLAD) technique. The TiO2 nanowires (NWs) were grown by GLAD on the conducting nafion channel of the TTISD ...

Added: June 26, 2023

Sensors modelling for Servosila Engineer crawler robot in Webots simulator

Dobrokvashina A., Lavrenov R., Bai Y. et al., , in: Proceedings of 2022 IEEE Moscow Workshop on Electronic and Networking Technologies (MWENT).: M.: IEEE, 2022. P. 1–5.

Simulations became a convenient, easy and safe way to interact with a robot in a virtual world in order to reproduce complex tasks and environments, preliminary evaluate new concepts and algorithms instead of directly building complicated testing field constructions in real world. Yet, a simulation requires an adequate model of a robot that corresponds well ...

Added: October 28, 2022