Ao Liu,Siyuan Lv,Li Jiang,Fangmeng Liu,Lianjing Zhao,Jing Wang,Xiaolong Hu,Zijie Yang,Junming He,Chenguang Wang,Xu Yan,Peng Sun,Kengo Shimanoe,Geyu Lu
In this work, we developed a NH 3 gas sensor based on polyaniline (PANI) composited with MoS 2 nanosheet-coated SnO 2 nanotubes (PMS) via electrostatic spinning, hydrothermal route and in-situ polymerization technique. The morphologies, nanostructures and compositions of the materials were obtained from X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Field emission scanning electron microscopy (FESEM), Transmission electron microscope (TEM) and Brunauer-Emmett-Teller method (BET). Thanks to nanostructure and the synergistic properties of PANI and MoS 2 /SnO 2 , the designed PMS gas sensor exhibited response signal of 10.9 towards 100 ppm NH 3 at room temperature and a low detection limit of 200 ppb with good response-recovery time, good repeatability, acceptable flexibility and excellent selectivity. This study offers a versatile platform to modify PANI for highly selective detection of NH 3 gas sensor at room temperature.
In this work, the Staphylococcus aureus ( S. aureus ) was firstly used as a template coupled with PVP in electrospinning experiments, Sn 2+ bonded with S. aureus and PVP to form nanofiber through electrospinning. Finally, we got the hierarchical mesoporous SnO 2 nanotube after calcination of the nanofiber . The hierarchical mesoporous SnO 2 nanotube as a gas sensor toward triethylamine (TEA) shows high sensitivity, better cycling stability and selectivity. The response and recovery time of the hierarchical mesoporous SnO 2 nanotube to 10 ppm TEA are about 19 s and 10 s.
Jiancheng Liu,Yu Yang,Yunying Xie,Fuchao Jia,Huijuan Niu,Xiaomei Wang,Tong Zhou,Guangchao Yin,Bo Liu
Isopropanol possessed enormous significance across various application fields from industry to healthcare. Detecting isopropanol was essential in leak detection and diagnosis of disease because it can assist diagnose of lung cancer and guarantee safety in industrial environment via discerning potential leaks. In this research, a simple hydrothermal method and subsequent sacrificial template strategy were used to fabricate in-situ growth SnO 2 nanotube arrays (SnO 2 NTs). Next, SnO 2 NTs was decorated with boron nitride quantum dots (BNQDs) in order to enhance the gas-sensing performances of the SnO 2 NTs. The BN/12-SnO 2 NTs exhibited the highest response (s = R a /R g ) of up to 7.9 for 100ppm IPA, which was 2.7 times that of the 12-SnO 2 NTs. The response and recovery times of the SnO 2 NTs-based sensor were around 10 s and 8 s, respectively. The optimal working temperature of BN-SnO 2 NTs was 260 ℃, which was significantly lower than that of the pure SnO 2 NTs sensor (320 ℃). The improved sensing performances were largely attributed to the sensitization effects of BNQDs and the one-dimensional hollow structure of SnO 2 NTs, which brought about the generation of more oxygen-active species on the surface of BN-SnO 2 NTs and a significant decrease in the activation energy of the redox reaction .
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