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.
Highlights
Fast and easy detection of dimethyl methylphosphonate (DMMP) has been the focus of much research [1,2,3,4,5,6]
Hollow ball-like nano-Fe2O3 was synthesized by a template-free hydrothermal method at a low temperature
After the relative thickness of the sensing film was optimized to 20 μg/mm2, the DMMP
Summary
Fast and easy detection of dimethyl methylphosphonate (DMMP) has been the focus of much research [1,2,3,4,5,6]. Several methods have been developed to detect DMMP at the ppm level [4,7,8,11,12,13]. Because of their high sensitivity and rapid response as well as their room temperature working conditions, quartz crystal microbalance (QCM)-based sensors have become the most popular choice [14,15,16,17,18]. The key challenge for a QCM gas sensor is how to adopt an appropriate sensing film material for the analyte to be detected
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