Improved Sensitivity of an NO Gas Sensor by Chemical Activation of Electrospun Carbon Fibers

Kang, Seok Chang; Sun, Ji; Lee, Young-Seak

doi:10.5714/cl.2011.12.1.021

Cited by 16 publications

(4 citation statements)

References 27 publications

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“…They then changed into -C-O-C-groups on the carbon surfaces. These differences in the chemical composition of the modified ACFs were expected micropores [28]. However, the A7-H100 and A7-K100 based gas sensors displayed higher sensitivities of approximately 11% and 12%, respectively, although they had lower S BET values.…”

Section: No Gas Sensingmentioning

confidence: 91%

NO gas sensing ability of activated carbon fibers modified by an electron beam for improvement in the surface functional group

Park¹,

Lee²,

Jung³

et al. 2016

Carbon letters

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Activated carbon fiber (ACF) surfaces are modified using an electron beam under different aqueous solutions to improve the NO gas sensitivity of a gas sensor based on ACFs. The oxygen functional group on the ACF surface is changed, resulting in an increase of the number of non-carbonyl (-C-O-C-) groups from 32.5% for pristine ACFs to 39.53% and 41.75% for ACFs treated with hydrogen peroxide and potassium hydroxide solutions, respectively. We discover that the NO gas sensitivity of the gas sensor fabricated using the modified ACFs as an electrode material is increased, although the specific surface area of the ACFs is decreased because of the recovery of their crystal structure. This is attributed to the static electric interaction between NO gas and the non-carbonyl groups introduced onto the ACF surfaces.

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Section: No Gas Sensingmentioning

confidence: 91%

NO gas sensing ability of activated carbon fibers modified by an electron beam for improvement in the surface functional group

Park¹,

Lee²,

Jung³

et al. 2016

Carbon letters

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“…Physical activation processes have used gases, such as water vapor [54], H 2 O 2 [83], NH 3 [84], and CO 2 [85,86] at ca. 800 • C. Chemical activation exposes solutions of CNFs to chemical agents such as KOH [87], ZnCl 2 [88,89], NaOH [63], K 2 CO 3 [63,90], and H 3 PO 4 [91,92], followed by treatment at high temperature.…”

Section: Microstructural Tuningmentioning

confidence: 99%

Electrospun carbon nanofibers as a functional composite platform: a review of highly tunable microstructures and morphologies for versatile applications

Lee

2020

Funct. Compos. Struct.

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Carbon nanostructures have been of increasing interest since the early 1990s because of their excellent material properties and light weight. Carbon nanofibers (CNFs) synthesized by electrospinning and subsequent thermal treatment are among the more promising nanostructured carbonaceous materials, because many experimental parameters can be modified for the precise manipulation of their morphologies and material properties. Technological advances and understanding of CNFs have expanded rapidly in the last 20 years. In this review, published research on CNFs, from precursors to material properties, is thoroughly reviewed, focusing on structures and properties from the perspective of applications. This review provides important insights that will be of benefit for the design of novel CNFs for widespread applications.

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“…Despite their effectiveness, these materials have limitations in terms of recyclability, and the breakthrough point-indicating gas adsorption saturation-is relatively short. Notably, these challenges are closely linked to particle morphology [20,21]. Addressing these challenges is pivotal for the development of advanced adsorbents, aiming to enhance both recyclability and breakthrough points.…”

Section: Introductionmentioning

confidence: 99%

A Chemical Safety Assessment of Lyocell-Based Activated Carbon Fiber with a High Surface Area through the Evaluation of HCl Gas Adsorption and Electrochemical Properties

Kim,

Bai

2024

Separations

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This study investigates lyocell-based activated carbon fibers (ACFs) for their suitability in adsorbing and electrochemically detecting toxic HCl gas. ACFs were prepared via steam activation, varying temperature (800–900 °C) and time (40–240 min) to assess their adsorption and sensing capabilities. The adjustment of activation temperature and reaction time aimed to regulate the uniformity of the pore structure and pore size of the active reaction area, as well as the number of reaction sites in the ACFs. Optimal ACFs were achieved at 900 °C for 50 min, exhibiting the highest specific surface area (1403 m2/g) and total pore volume (0.66 cm3/g). Longer reaction times resulted in pore formation and disorder, reducing mechanical strength. The ACFs prepared under optimal conditions demonstrated a rapid increase in resistance during sensor measurement, indicating a significant sensitivity to HCl gas. These findings suggest the potential of ACFs for efficient HCl gas adsorption (1626.20 mg/g) and highlight the importance of activation parameters in tailoring their properties for practical applications.

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Improved Sensitivity of an NO Gas Sensor by Chemical Activation of Electrospun Carbon Fibers

Cited by 16 publications

References 27 publications

NO gas sensing ability of activated carbon fibers modified by an electron beam for improvement in the surface functional group

NO gas sensing ability of activated carbon fibers modified by an electron beam for improvement in the surface functional group

Electrospun carbon nanofibers as a functional composite platform: a review of highly tunable microstructures and morphologies for versatile applications

A Chemical Safety Assessment of Lyocell-Based Activated Carbon Fiber with a High Surface Area through the Evaluation of HCl Gas Adsorption and Electrochemical Properties

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