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

Abstract

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.

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

“…Modification with functional groups to enhance sorption properties is easily achievable. Leveraging these attributes, ACF has found applications as a material for adsorption filters targeting the removal of harmful gases [24,25]. Beyond filtration, ACFs serve as exceptional porous electrode materials due to their outstanding electrical conductivity.…”

Valorization of Agricultural Waste as a Chemiresistor H2S-Gas Sensor: A Composite of Biodegradable-Electroactive Polyurethane-Urea and Activated-Carbon Composite Derived from Coconut-Shell Waste

“…BEP composites were prepared by reinforcing BEP with activated carbon (AC) derived from coconut-shell waste. AC composites derived from various sources have been reported in gas detection [ 57 , 58 , 59 , 60 , 61 ]. AC derived from coconut shell is amorphous in nature; it is virtually harder, dust-free, with high purity and density, and resistant to attrition.…”