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Title: | A Physical Modeling of TiO2 Nanotube Array-Based Capacitive Vapor Sensor |
Authors: | Hazra, Arnab |
Keywords: | EEE TiO ${_{2}}$ nanotube array Sandwich device structure and TiO₂ nanotubes array Vapor sensing Capacitive response |
Issue Date: | Jan-2018 |
Publisher: | IEEE |
Abstract: | A physical model was developed to estimate the capacitance and capacitive response of electrochemically grown ordered and self-organized TiO2 nanotube array based sandwich structured vapor sensor device (Au/TiO2 nanotube /Ti). Nanotubes were modeled in hexagonal grid geometry considering its structural and morphological parameters. Five different capacitances, i.e., capacitance due to TiO2 solid (Cn), free space in bulk (Cf), Au/TiO2 junction (Cju), Ti/TiO2 junction (Cjd), and internal capacitances between two adjacent nanotubes (Cz) were formulated, simplified, and represented in a complex capacitive network. Equivalent device capacitance (Ceq) was calculated by solving the charge-voltage equations through matrix method. Simulated capacitance (Ceq) and capacitive response (R C) of Au/TiO2 nanotube /Ti device towards different organic vapors were compared with practically measured values obtained by impedance analysis method. |
URI: | https://ieeexplore.ieee.org/document/8094291 http://dspace.bits-pilani.ac.in:8080/xmlui/handle/123456789/9651 |
Appears in Collections: | Department of Electrical and Electronics Engineering |
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