Anodic alumina membrane capacitive sensors for detection of vapors

Podgolin, Stepan K.; Petukhov, Dmitrii I.; Dorofeev, S. G.; Eliseev, Andrei A.

doi:10.1016/j.talanta.2020.121248

Cited by 15 publications

(11 citation statements)

References 38 publications

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“…Capacitive gas sensors are used to detect changes in the dielectric constant upon adsorption of the target gas onto the sensing material of the sensor. The dielectric constants of dry air, alcohol vapor, and water vapor, which can affect alcohol sensor measurements, are 1.0006, 1.0061, and 1.0126, respectively [ 30 ]. Therefore, capacitive gas sensors are inherently susceptible to moisture [ 31 ].…”

Section: Resultsmentioning

confidence: 99%

Anodic Aluminum Oxide-Based Chemi-Capacitive Sensor for Ethanol Gas

Lim,

Kim,

Park

et al. 2023

Nanomaterials

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Alcohol ingested by humans can be analyzed via breath tests; however, approximately 1% can be excreted via the skin. In this paper, we present a capacitive sensor using hydrophobically treated anodic aluminum oxide (AAO) capable of detecting alcohol excreted through the epidermis. The degree of hydrophobicity based on the duration of exposure to 3-aminopropyltriethoxysilane vapor comprising a small number of Si–NH2 functional groups on the AAO surface was confirmed and the optimal exposure time was confirmed to be 60 min. The hydrophobized AAO showed a 4.8% reduction in sensitivity to moisture. Simultaneously, the sensitivity of the sensor to ethanol decreased by only 12%. Lastly, the fabricated sensor was successfully operated by attaching it to an ankle-type breathalyzer.

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Section: Resultsmentioning

confidence: 99%

Anodic Aluminum Oxide-Based Chemi-Capacitive Sensor for Ethanol Gas

Lim,

Kim,

Park

et al. 2023

Nanomaterials

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“…The introduction of AAO membrane enhances sensitivity and reduces energy consumption as isolation of the graphene layers acts as an off state [130]. Few notable applications of AAO in sensing are given in Table 5 [98,106,111,115,123,[126][127][128][130][131][132][133][134][135][136][137][138][139][140].…”

Section: Aao Membrane In Sensors 331 Applications Of Aao Membrane In ...mentioning

confidence: 99%

Recent Progress of Fabrication, Characterization, and Applications of Anodic Aluminum Oxide (AAO) Membrane: A Review

Manzoor¹,

Ashraf²,

Tayyaba³

et al. 2023

Computer Modeling in Engineering &Amp; Sciences

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The progress of membrane technology with the development of membranes with controlled parameters led to porous membranes. These membranes can be formed using different methods and have numerous applications in science and technology. Anodization of aluminum in this aspect is an electro-synthetic process that changes the surface of the metal through oxidation to deliver an anodic oxide layer. This process results in a self-coordinated, exceptional cluster of round and hollow formed pores with controllable pore widths, periodicity, and thickness. Categorization in barrier type and porous type films, and different methods for the preparation of membranes, have been discussed. After the initial introduction, the paper proceeds with a brief overview of anodizing process. That engages anodic aluminum oxide (AAO) layers to be used as formats in various nanotechnology applications without the necessity for expensive lithographical systems. This review article surveys the current status of the investigation on AAO membranes. A comprehensive analysis is performed on AAO membranes in applications; filtration, sensors, drug delivery, template-assisted growth of various nanostructures. Their multiple usages in nanotechnology have also been discussed to gather nanomaterials and devices or unite them into specific applications, such as nano-electronic gadgets, channel layers, and clinical platforms tissue designing. From this review, the fact that the specified enhancement of properties of AAO can be done by varying geometric parameters of AAO has been highlighted. No review paper focused on a detailed discussion of multiple applications of AAO with prospects and challenges. Also, it is a challenge for the research community to compare results reported in the literature. This paper provides tables for easy comparison of reported applications with membrane parameters. This review paper represents the formation, properties, applications with objective consideration of the prospects and challenges of AAO applications. The prospects may appeal to researchers to promote the development of unique membranes with functionalization and controlled geometric parameters and check the feasibility of the AAO membranes in nanotechnology and devices.

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“…Based on this basic mathematical model, experiments were performed on annealed high-purity aluminium wires (99.99% Al) with diameters of 200 μm, 250 μm and 500 μm (initial radiuses of 100 μm, 125 μm and 250 µm). The voltage reduction steps calculated by dependence (7)…”

Section: Mathematical Modelmentioning

confidence: 99%

“…Anodic aluminium oxide (AAO) is a well-known material used for the synthesis of nanostructures, such as nanowires, nanotubes and nanorods, and for developing advanced sensing devices [1][2][3][4][5][6][7]. Anodic layers formed on aluminium under acidic electrolyte conditions are grown into nanoporous structures, producing regular arrays of hexagonal cells with cylindrical holes [8].…”

Section: Introductionmentioning

confidence: 99%

Formation of oxide films on a curved aluminium surface upon anodic oxidation

Tzaneva

Videkov

Bankova

et al. 2022

J. Phys.: Conf. Ser.

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The aluminium oxide obtained by anodization in acidic solutions has a highly ordered nanoporous structure consisting of straight parallel pores. The oxide layer has good electrical insulating properties on planar surfaces. However, the electrochemical formation of nanoporous film on convex surface induces effects such as crack formation and deterioration of the insulating properties. The present work is focused on investigating the conditions of growth of a thick oxide layer on aluminium wires with a diameter of 0.2 mm to 0.5 mm. In order to prevent cracking, the oxide growth was carried out by reducing the anodization voltage according to a mathematical model in view of obtaining conical pores. In this study, the minimum thickness at which a crack-free oxide layer grows was determined.

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Anodic alumina membrane capacitive sensors for detection of vapors

Cited by 15 publications

References 38 publications

Anodic Aluminum Oxide-Based Chemi-Capacitive Sensor for Ethanol Gas

Anodic Aluminum Oxide-Based Chemi-Capacitive Sensor for Ethanol Gas

Recent Progress of Fabrication, Characterization, and Applications of Anodic Aluminum Oxide (AAO) Membrane: A Review

Formation of oxide films on a curved aluminium surface upon anodic oxidation

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