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Gas Sensor Based on 3-D WO3 Inverse Opal: Design and Applications

1,2,*, 1,2, 1,2 and 1,2
Tianjin Key laboratory of Wireless Mobile Communications and Power Transmission, Tianjin Normal University, Tianjin 300387, China
College of Electronic and Communication Engineering, Tianjin Normal University, Tianjin 300387, China
Author to whom correspondence should be addressed.
Academic Editor: Giovanni Neri
Sensors 2017, 17(4), 710;
Received: 12 February 2017 / Revised: 21 March 2017 / Accepted: 21 March 2017 / Published: 29 March 2017
(This article belongs to the Collection Gas Sensors)
PDF [3047 KB, uploaded 29 March 2017]


A three-dimensional inverse opal (3DIO) WO3 architecture has been synthesized via a simple sacrificial template method. Morphology features of the 3DIO were characterized by scanning electron microscope (SEM) and its structure was characterized by X-ray diffraction (XRD). The shrinking ratio of the PMMA spheres was ~28.2% through measuring the distribution of the PMMA spheres and 3DIO WO3 center-to-center distance between the spheres and macropores, respectively. Beyond that, the 3DIO gas sensing properties were investigated systematically and the sensing mechanism of 3DIO WO3 was proposed. The results indicated that the response of the 3DIO sensor possessed excellent sensitivity to acetone gas, especially at trace levels. The 3DIO gas sensor response was ~7 to 5 ppm of acetone and could detect acetone low to 0.2 ppm effectively, which was in close proximity to the theoretical low detection limit of 0.14 ppm when Ra/Rg ≥ 1.2 was used as the criterion for reliable gas sensing. All in all, the obvious satisfaction of the gas-sensing properties was ascribed to the structure of the 3DIO, and the sensor could be a promising novel device in the future. View Full-Text
Keywords: WO3; acetone; gas sensing; monitoring; inverse opal WO3; acetone; gas sensing; monitoring; inverse opal

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Xing, R.; Du, Y.; Zhao, X.; Zhang, X. Gas Sensor Based on 3-D WO3 Inverse Opal: Design and Applications. Sensors 2017, 17, 710.

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