Enhancement of the electron transfer rate in carbon nanotube flexible electrochemical sensors by surface functionalization

Nishimura, Keita; Ushiyama, Takuya; Viết, Nguyễn Xuân; Inaba, Masafumi; Kishimoto, Shigeru; Ohno, Yutaka

doi:10.1016/j.electacta.2018.10.147

Cited by 22 publications

(16 citation statements)

References 48 publications

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“…As expected, anodic peak current (I pa ) and cathodic peak current (I pc ) of the CNTs-modified WE are higher than currents in the CNPs electrode due to the lower conductivity of CNPs ink. The finding indicates that the electron transfer is enhanced by the presence of CNTs (Bounegru and Apetrei, 2020; Nishimura et al , 2018).…”

Section: Resultsmentioning

confidence: 92%

Development of an inkjet-printed electrochemical nanosensor for ascorbic acid detection

Alhazimeh

Al-Fandi

Al-Ebbini

2022

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Purpose Ascorbic acid (AA) is an essential vitamin for human health. Therefore, fast and cost-effective detecting of AA is essential, whether in human or food samples. The purpose of this paper is to develop an electrochemical nanosensor for AA detection. Design/methodology/approach The proposed nanosensor was developed by printing carbon nanoparticles ink and silver nanoparticles ink on a polydimethylsiloxane (PDMS) substrate. The surface of the PDMS substrate was first treated by corona plasma. Then, the nanomaterials printer was used to deposit both inks on the substrate. The working electrode surface was modified by drop-casting of carbon nanotubes. Morphological evaluation was applied using scanning electron microscopy and cyclic voltammetry. Also, a potentiostat was used to detect AA by differential pulse voltammetry. Findings It has been shown that the developed nanosensor linearly worked at a range of (0–5 mM), with a limit of detection lower than 0.8 mM and a relative standard deviation of 6.6%. Originality/value The developed nanosensor is characterized by a simple and cost-effective sensing tool for AA. In particular, the nanomaterials enhanced the nanosensor’s sensitivity due to the high catalytic activity.

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Section: Resultsmentioning

confidence: 92%

Development of an inkjet-printed electrochemical nanosensor for ascorbic acid detection

Alhazimeh

Al-Fandi

Al-Ebbini

2022

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“…First, numerous CO and CO species may enhance the electron transfer rate within the catalysts. [53] Second, the abundant oxygen-containing groups bound on the CNFs may lead to the super-hydrophilicity of Ru@CNF and further reduce the interface resistance between the aqueous electrolyte and the catalyst. [52] Moreover, the durability of Ru@CNF was evaluated by comparing the LSV curve recorded for the catalyst after 10 000 CV scans with that of the fresh catalyst.…”

Section: Resultsmentioning

confidence: 99%

“…[50,51] The chemical flexibility of the carbon matrix could further improve the electrocatalytic activity by influencing the distribution of metal nanocatalysts and strengthening the synergistic effects with electrocatalytic active species. [52,53] For example, biomass-derived carbon quantum dots decorated with numerous oxygen-and nitrogen-containing groups that support the Ru NPs have been reported to achieve noteworthy HER performance. [32,[36][37] Bacterial cellulose (BC), as a copious and eco-friendly nanobiomaterial, has attracted widespread interest because of its unique interconnected nanofiber structure and excellent physical properties, such as high water-holding capacity, large specific surface area, good chemical stability, and robust mechanical strength.…”

Section: Introductionmentioning

confidence: 99%

Nanoscaled and Atomic Ruthenium Electrocatalysts Confined Inside Super‐Hydrophilic Carbon Nanofibers for Efficient Hydrogen Evolution Reaction

Xie

Wang

Lin

et al. 2021

Small

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A series of Ru‐based catalysts have been developed for the hydrogen evolution reaction (HER) by the facile impregnation of copious and eco‐friendly bacterial cellulose (BC) with Ru(bpy)3Cl2 (bpy = 2,2′‐bipyridine) followed by pyrolysis. After the oxidation and molecular recomposition processes that occur within the BC precursors during pyrolysis, sub‐2 nm Ru nanoparticles (NPs) and atomic Ru species confined within surface‐oxidized N‐doped carbon nanofibers (CNFs) can be observed in the derived catalysts. The surface oxidation of CNFs leads the derived catalysts with super hydrophilicity and water‐absorbing capacity, and also provides dimensional confinement for the nanoscaled and atomic Ru species. With these added structural advantages and the component synergy, the derived catalysts show superior HER activities, for which the overpotentials are as low as 19.6 mV (1 m KOH) and 55.0 mV (0.5 m H2SO4) for the most active case at the current density of 10 mA cm−2. Moreover, superior HER activity can be also achieved for the catalysts derived with a wide range of Ru loadings. Finally, the influence of Ru NP size on HER activity is investigated by density functional theory simulations. This method provides a reliable protocol for preparing highly active HER catalysts for scale‐up applications.

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“…The details of the CNT growth condition and transfer process were the same as in previous work. [41,42] Then, a gate dielectric layer of Al 2 O 3 (50 nm) was deposited by ALD at 145 °C. Contact holes for gate electrode access were formed by photolithography and wet etching with a base solution (Microposit MF CD-26 Developer).…”

Section: Methodsmentioning

confidence: 99%

Low‐Voltage Operable and Strain‐Insensitive Stretchable All‐Carbon Nanotube Integrated Circuits with Local Strain Suppression Layer

Nishio

Hirotani

Kishimoto

et al. 2020

Adv Elect Materials

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Stretchable devices, which can intimately contact dynamic free‐form surfaces, show great promise for wearable and implantable devices for human beings and multifunctional electronic skins for soft robotics. Although some successful stretchable devices have been reported, there are still remaining issues; in particular, the fundamental requirements for wearable devices, including low‐voltage operation, operation speed, mechanical stretchability and robustness, and easy circuit design, are needed to be satisfied simultaneously. Here, a local strain suppression layer (L‐SSL) is introduced into all‐carbon nanotube (CNT) stretchable thin‐film transistors (TFTs) and integrated circuits (ICs) to address these issues. The L‐SSL, which has a high Young's modulus, is placed on top of the active channel region to suppress the induced local strain. The resulting CNT TFTs show no drain current degradation under externally applied tensile strain of up to 35%. Furthermore, stretchable all‐CNT ICs, such as inverters and ring oscillators, can operate at low supply voltage as 0.7 V, because high‐k material can be used underneath the L‐SSL. Biaxial stretching, an indispensable ability for wearable devices on 3D deformable surfaces such as the human body, is also achieved. The all‐CNT devices, equipped with an L‐SSL, demonstrate potential for strain‐insensitive stretchable devices with low‐voltage operation.

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Enhancement of the electron transfer rate in carbon nanotube flexible electrochemical sensors by surface functionalization

Cited by 22 publications

References 48 publications

Development of an inkjet-printed electrochemical nanosensor for ascorbic acid detection

Development of an inkjet-printed electrochemical nanosensor for ascorbic acid detection

Nanoscaled and Atomic Ruthenium Electrocatalysts Confined Inside Super‐Hydrophilic Carbon Nanofibers for Efficient Hydrogen Evolution Reaction

Low‐Voltage Operable and Strain‐Insensitive Stretchable All‐Carbon Nanotube Integrated Circuits with Local Strain Suppression Layer

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