NDLI: Au thin-film electrodes based potentiometric CO2 sensor using Li3PO4 as both the reference material and the solid electrolyte

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The Journal of Engineering

Au thin-film electrodes based potentiometric CO2 sensor using Li3PO4 as both the reference material and the solid electrolyte

Content Provider	IET Digital Library
Author	Wang, Hairong Chen, Di Liu, Zhen Zhang, Mi
Abstract	Thin-film Au electrodes prepared by magnetron sputtering method were used to develop a potentiometric CO2 gas sensor. The thermal evaporated Li3PO4 played the role of electrolyte and sensing material. This design can simplify the fabrication process compared with the conventional solid electrolyte potentiometric CO2 sensor (c-sensor) and improve the performance compared with the thick-film Au electrodes sensor (t-sensor). The designed CO2 sensor (d-sensor) presented good response characteristics at the CO2 concentration range of 250–2500 ppm and the electromotive force (EMF), ΔEMF/dec, response and recovery time were investigated. The EMF values of the sensor were linearly dependent on logarithm of CO2 partial pressure at the working temperatures between 420°C and 500°C. The d-sensor showed a sensitivity of 79.1–93.7 mV/dec at working temperatures range of 420–500°C which was much higher than the sensitivities of c-sensor and the t-sensor. The response and recovery time of the fabricated sensors were 10 and 14 s at working temperature of 500°C, respectively. The surface morphology of Au thin films was considered to increase the three-phase interface area and be good for the reaction gases to diffuse from Au film to lithium phosphate, allowing rapid chemical reaction equilibrium, getting a more stable EMF output.
Starting Page	545
Ending Page	549
Page Count	5
Volume Number	11
e-ISSN	17500443
Issue Number	Issue 9, Sep (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/mnl/11/9
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/mnl.2016.0240
Journal	Micro & Nano Letters
Publisher Date	2016-09-01
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	C-sensor Chemical Sensor CO2 Conventional Solid Electrolyte Potentiometric Sensor D-sensor Deposition by Sputtering Electric Potential Electrochemical Electrodes Electrochemical Sensor Electrochemistry And Electrophoresis Electrodes Sensor Electrolyte Electromotive Force EMF Output EMF Value Epitaxy Gas Sonsor Gold Li3PO4 Lithium Compound Lithium Phosphate Magnetron Sputtering Method Metallic Thin Film Partial Pressure Potentiometric Gas Sensor Rapid Chemical Reaction Equilibrium Response Characteristic Solid Electrolyte Solid Electrolytes Solid Surface Structure Sputter Deposition Structure Surface Modulator/Detector Array T-sensor Temperature 420 DegC to 500 DegC Thermal Evaporated Thin Film Growth Thin Film Sonsor Thin-film Electrode Based Potentiometric Sensor Thin-hlm Electrodes Three-phase Interface Area Vacuum Deposition
Content Type	Text
Resource Type	Article

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