Enhanced NH3 gas sensing performance based on electrospun alkaline-earth metals composited SnO2 nanofibers
Enhanced NH3 gas sensing performance based on electrospun alkaline-earth metals composited SnO2 nanofibers
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DOI：
10.1016/j.jallcom.2014.08.153
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发表时间：
2015-01
影响因子：
6.2
通讯作者：
Shuang Xu;K. Kan;Ying Yang;Chao Jiang;Jun Gao;L. Jing;P. Shen;Li Li-Li;K. Shi
中科院分区：
文献类型：
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作者：
Shuang Xu;K. Kan;Ying Yang;Chao Jiang;Jun Gao;L. Jing;P. Shen;Li Li-Li;K. Shi
通过静电纺丝技术制备一维碱土金属复合 SnO2(Ae/SnO2) 纳米纤维，然后在 600°C 下热处理 5 小时。透射电子显微镜 (TEM) 研究表明，Ae/SnO2 的纳米颗粒尺寸为 5–7 nm，小于附着 20 nm 纳米颗粒的原始 SnO2 纳米棒。此外，Sr/SnO2 纳米复合材料表现出均匀的纳米管结构，壁厚约为 30 nm，其中所有纳米颗粒都通过颈部与其相邻纳米颗粒相连。与原始 SnO2 纳米棒相比，Sr/SnO2 纳米管在室温下对 NH3 气体表现出优异的传感响应、更低的检测限 (10 ppm)、更快的响应时间（6 s 到 2000 ppm∼16 s 到 10 ppm）和更好的可逆性。传感器性能的增强归因于 Sr/SnO2 更高的电导率。莫特-肖特基图 (M-S) 和电化学阻抗谱 (EIS) 测量表明 Sr/SnO2 纳米管的载流子密度是原始 SnO2 的 3 倍。
One-dimensional alkaline-earth metals composited SnO2(Ae/SnO2) nanofibres were fabricated via electrospinning technique, followed by thermal treatment at 600 °C for 5 h. Transmission electron microscopy (TEM) studies showed that the nanoparticles size of Ae/SnO2was 5–7 nm, which was smaller than the pristine SnO2nanorods attached by 20 nm nanoparticles. Moreover, Sr/SnO2nanocomposites showed uniform nanotubes structure with the wall thickness of about 30 nm, in which all the nanoparticles were connected to their neighbors by necks. The Sr/SnO2nanotubes exhibited an excellent sensing response toward NH3gas at room temperature, lower detection limit (10 ppm), faster response time (6 s towards 2000 ppm∼16 s towards 10 ppm) and better reversibility compared to the pristine SnO2nanorods. The enhanced sensor performances were attributed to the higher conductivity of the Sr/SnO2. Mott–Schottky plots (M–S) and electrochemical impedance spectroscopy (EIS) measurements indicated that the carrier density of Sr/SnO2nanotubes was 3 fold of that pristine SnO2.