Room Temperature Ethanol Gas Sensor Based on Slits Mesoporous Silicon

Abed, Husam R.; Alwan, Alwan M.; Zayer, Mehdi Q.

doi:10.1007/s11664-022-09691-8

Cited by 3 publications

(1 citation statement)

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“…33 Table 3 compares prior reported capacitive gas sensors' LOD and response time to ethanol at room temperature. 3,[34][35][36][37][38][39][40][41][42] When exposed to the anion-contaminated layer, ethanol with a dipole moment of 1.67 and a dielectric constant of 24 was adsorbed and desorbed by hydroxyl groups and oxalates at the AAO anioncontaminated site; the sensing mechanism is illustrated in Figure 5.…”

Section: Stable Ppb-level Detection Of Aao Sensormentioning

confidence: 99%

ppb‐Level ethanol gas sensor of porous anodic aluminum oxide at room temperature

Park

Yi²,

Eom

2023

J Am Ceram Soc.

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Excessive ethanol in breath can be an indicator of alcoholism and a biomarker of liver disease. Herein, we present a novel porous aluminum anodic oxide (AAO)‐based chemi‐capacitive sensor that can detect ppb‐levels of ethanol gas at room temperature. The oxalic acid‐based porous AAO is an amorphous material contaminated with Al(OH)3 and C2O42− ions (anion‐contamination), which react with adsorbed ethanol gas. The optimal resonance frequency of ethanol was determined to be 500 Hz, and the response to 200 ppm ethanol at this frequency was 1.56%. Especially, the limit of detection of ppb‐level (16.49 ppb) was obtained. The detection range, reliability, and selectivity of the sensor, as well as its surface properties were comprehensively investigated. The proposed sensor is promising for the detection of liver disease as well as for commercial breath ethanol analyzers.

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