New concept in Humidity sensing: Role of Molecular Brownian energy and probabilistic Mean free path of Vapour molecule

ACS Applied Materials & Interfaces
Kusum SharmaSaikh Safiul Islam

Abstract

A break in traditional pore morphology approach in anodic alumina, is presented here to see its niche merit over the conventional sensors for water vapour detection. Cylindrical pore structure was replaced with normal cone for trace-, and inverse cone for RH- level detection. The normal conical pore was fabricated by sheer manipulation of reaction rates of electrolytes, anodic polarization rate and time; and the procedure made reversed in case of inverse cone structure. Sensor with normal cone geometry, exhibits excellent response in ppm and slightly extended to low RH level with detection range 120 ppm - 30% RH; having response- and recovery time of 6s and 255s, measured at 120 ppm. Lowering of minimum detection limit, further requires alteration of conical geometric parameters, in tandem with molecular dynamics of water vapour molecules within pore. In contrast, sensor developed from inverse conical structure shows response only in RH level, from 20% RH - 90% RH; with response and recovery time less than 60s over the entire range. The limitations such as nonlinear response, large response recovery time, and high hysteresis as observed in conventional anodic alumina based humidity sensors have been removed. The sensor response...Continue Reading

References

Mar 8, 2012·ACS Nano·Huaizhou ZhaoDong Cai
Aug 21, 2014·ACS Applied Materials & Interfaces·Shumin ZhangXuhui Sun
Aug 15, 2015·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·S O Diallo
Sep 7, 2016·ACS Applied Materials & Interfaces·Kai JiangTong Zhang
Jan 18, 2019·ACS Applied Materials & Interfaces·Jin WuGuo Ping Wang
Jul 26, 2019·ACS Applied Materials & Interfaces·Md Azimul HaqueTom Wu

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