2D SnO2 Nanosheets: Synthesis, Characterization, Structures, and Excellent Sensing Performance to Ethylene Glycol.
2D SnO2 Nanosheets: Synthesis, Characterization, Structures, and Excellent Sensing Performance to Ethylene Glycol.
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二维 SnO2 纳米片：合成、表征、结构以及对乙二醇的优异传感性能
DOI：
10.3390/nano8020112
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发表时间：
2018-02-16
期刊：
影响因子：
--
通讯作者：
Zhao H
中科院分区：
文献类型：
--
作者：
Wan W;Li Y;Ren X;Zhao Y;Gao F;Zhao H
以锡酸钠和氢氧化钠为原料，在无水乙醇和去离子水的混合溶剂中，在较低温度130℃下，采用无底物水热法制备了二维SnO2纳米片。形貌、微观结构和表面性能的表征结果表明，SnO2纳米片由直径为6 ~ 12 nm的定向SnO2纳米颗粒组成，具有四方金红石结构。x射线衍射（XRD）和高分辨率透射电镜（FETEM）结果表明，SnO2纳米颗粒的优势暴露表面为（101），而不是（110）。生长和形成应遵循定向附着机制。在较低的最佳工作电压3.4 V下，SnO2纳米片对乙二醇表现出优异的传感响应。对400 ppm乙二醇的响应在3.4 V时达到395。即使在5、10和20 ppm的低浓度下，传感器对乙二醇的响应也分别达到了6.9、7.8和12.0。在5 ~ 1000ppm范围内，SnO2纳米片的响应与乙二醇浓度呈线性关系。所制备的SnO2纳米颗粒具有接近Debye长度的小尺寸、较大的比表面积、（101）表面的高能量暴露面以及SnO2纳米颗粒在纳米片上的协同作用，具有优异的传感性能。
Two dimensional (2D)SnO2 nanosheets were synthesized by a substrate-free hydrothermal route using sodium stannate and sodium hydroxide in a mixed solvent of absolute ethanol and deionized water at a lower temperature of 130 °C. The characterization results of the morphology, microstructure, and surface properties of the as-prepared products demonstrated that SnO2 nanosheets with a tetragonal rutile structure, were composed of oriented SnO2 nanoparticles with a diameter of 6–12 nm. The X-ray diffraction (XRD) and high-resolution transmission electron microscope (FETEM) results demonstrated that the dominant exposed surface of the SnO2 nanoparticles was (101), but not (110). The growth and formation was supposed to follow the oriented attachment mechanism. The SnO2 nanosheets exhibited an excellent sensing response toward ethylene glycol at a lower optimal operating voltage of 3.4 V. The response to 400 ppm ethylene glycol reaches 395 at 3.4 V. Even under the low concentration of 5, 10, and 20 ppm, the sensor exhibited a high response of 6.9, 7.8, and 12.0 to ethylene glycol, respectively. The response of the SnO2 nanosheets exhibited a linear dependence on the ethylene glycol concentration from 5 to 1000 ppm. The excellent sensing performance was attributed to the present SnO2 nanoparticles with small size close to the Debye length, the larger specific surface, the high-energy exposed facets of the (101) surface, and the synergistic effects of the SnO2 nanoparticles of the nanosheets.
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