Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 312, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2020.127892
Keywords
Polyaniline (PANI); WO3 nanoplate; WO3@PANI nanocomposite; NH3 detection; Ultrasonic spray
Funding
- National Natural Science Foundation of China [51574205]
- National Key Research and Development Program of China [2016YFA02030000]
- Natural Science Foundation of Guangdong Province [2018B030311022]
- Guangdong Innovation Research Team for Higher Education [2017KCXTD030]
- High-level Talents Project of Dongguan University of Technology [KCYKYQD2017017]
- Engineering Research Center of None-Food Biomass Efficient Pyrolysis & Utilization Technology of Guangdong Higher Education Institutes [2016GCZX009]
- Program from Dongguan University of Technology [G200906-17]
- Postdoctoral Research Sponsorship in Henan Province [19030025]
- [2019M652570]
- [2019M652574]
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Low-temperature detection of ammonia (NH3) is of great significance in environmental control and human health. This paper reports an ultrasonic spray-assisted in-situ polymerization method to grow polyaniline (PANI) on the WO3 nanoplates derived by an intercalation-exfoliation process. The as-obtained WO3 @PANI (UWP-x) nanocomposites were designed with various aniline/WO3 molar ratios (x). The characterization analyses of chemical compositions and microstructure using XRD, XPS, FT-IR, SEM and TEM indicate that the WO3 @PANI samples consist of single-crystal WO3 nanoplates anchored with PANI nanoparticles. The NH3-sensing behaviors of the WO3@PANI nanocomposites were systematically evaluated. The WO3@PANI nanocomposites show higher NH3 -sensing performance than the WO3 nanoplates or PANI nanocrystals under same operating conditions. The optimized sample of UWP-2.5 is obviously sensitive to 0.5 ppm NH3, and exhibits a high response of 34 upon exposure to 100 ppm NH3 at room temperature with high stability and selectivity. Control experiments indicated that the ultrasonic spray process has played a vital role in forming PANI/WO3 nanocomposites with high NH3-sensing performance. Due to the proper anchoring and positive synergistic effect of PANI andWO(3) species, the newly-developed ultrasonic spray-assisted in-situ polymerization method provides a facile way to achieve high-performance room-temperature NH3-sensing materials.
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