Sensors 2012, 12(4), 4594-4604; doi:10.3390/s120404594
Article

Template Free Synthesis of Hollow Ball-Like Nano-Fe2O3 and Its Application to the Detection of Dimethyl Methylphosphonate at Room Temperature

1 State Key Laboratory of Industrial Control Technology, Institute of Cyber Systems and Control, Zhejiang University, Hangzhou 310027, China 2 School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225002, China 3 Computer Learning Research Centre, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK
* Author to whom correspondence should be addressed.
Received: 8 March 2012; in revised form: 29 March 2012 / Accepted: 30 March 2012 / Published: 10 April 2012
(This article belongs to the Special Issue Sensing at the Nano-Scale: Chemical and Bio-Sensing)
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Abstract: This paper is focused on the template-free synthesis of nanosized ferric oxide (nano-Fe2O3) and its application in quartz crystal microbalance (QCM) resonators to detect dimethyl methylphosphonate (DMMP), a simulant of Sarin. The X-ray diffraction (XRD) patterns confirm that the synthesized samples are made of Fe2O3 and the scanning electron microscopy (SEM) pictures show that the samples have ball-like shapes. The DMMP sensors with a sensing film of hollow ball-like and solid ball-like Fe2O3 are fabricated and their sensing characteristics are compared. The sensitivity of the hollow ball-like Fe2O3 sensor is more than 500% higher than the one of the solid ball-like Fe2O3 sensor. The hollow ball-like nano-Fe2O3 can be synthesized by a novel low temperature hydrothermal method. The sensors with the hollow ball-like Fe2O3 film perform well in a range of 1 to 6 ppm, with a sensitivity of 29 Hz/ppm at room temperature, while the appropriate recoverability and selectivity are maintained. In addition, the performance of different thicknesses of the sensing film of the hollow ball-like nano-Fe2O3 is investigated and the optimized relative film thickness of the hollow ball-like nano-Fe2O3 is found to be 20 μg/mm2.
Keywords: nano-Fe2O3; quartz crystal microbalance (QCM); dimethyl methylphosphonate (DMMP); gas sensor

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MDPI and ACS Style

Fan, G.; Wang, Y.; Hu, M.; Luo, Z.; Zhang, K.; Li, G. Template Free Synthesis of Hollow Ball-Like Nano-Fe2O3 and Its Application to the Detection of Dimethyl Methylphosphonate at Room Temperature. Sensors 2012, 12, 4594-4604.

AMA Style

Fan G, Wang Y, Hu M, Luo Z, Zhang K, Li G. Template Free Synthesis of Hollow Ball-Like Nano-Fe2O3 and Its Application to the Detection of Dimethyl Methylphosphonate at Room Temperature. Sensors. 2012; 12(4):4594-4604.

Chicago/Turabian Style

Fan, Guokang; Wang, You; Hu, Meng; Luo, Zhiyuan; Zhang, Kaihuan; Li, Guang. 2012. "Template Free Synthesis of Hollow Ball-Like Nano-Fe2O3 and Its Application to the Detection of Dimethyl Methylphosphonate at Room Temperature." Sensors 12, no. 4: 4594-4604.

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