Ultrathin SnO2 nanorods: template- and surfactant-free solution phase synthesis, growth mechanism, optical, gas-sensing, and surface adsorption properties.
Ultrathin SnO2 nanorods: template- and surfactant-free solution phase synthesis, growth mechanism, optical, gas-sensing, and surface adsorption properties.
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DOI：
10.1021/ic902131a
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发表时间：
2010-01
影响因子：
4.6
通讯作者：
Guangcheng Xi;Jinhua Ye
中科院分区：
文献类型：
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作者：
Guangcheng Xi;Jinhua Ye
首次成功开发了一种新型的无模板剂和表面活性剂的低温溶液相方法，用于控制合成超薄SnO(2)单晶纳米棒。超薄SnO(2)单晶纳米棒的直径为2.0+/-0.5 nm，小于其激子玻尔半径。超薄SnO(2)纳米棒具有高比表面积(191.5 m(2) g(-1))。这种薄的SnO(2)单晶纳米棒是SnO(2)纳米结构家族中的新型材料，具有很强的量子限域效应。它的形成取决于反应温度以及尿素溶液的浓度。基于对时间依赖性晶体演化过程的详细观察，提出了一种非经典结晶过程，即奥斯特瓦尔德熟化过程和定向附着机制。重要的是，这种结构的SnO(2)表现出强烈的结构诱导的气敏性能增强，并且与其他结构的SnO(2)（例如纳米带和微米棒的粉末）相比，在乙醇检测中表现出大大增强的气敏性能。此外，这些超细SnO(2)纳米棒通过巨大的表面吸附表现出优异的去除废水中有机污染物的能力。这些特性主要归功于其较高的表面积与体积比和超薄直径。这项工作为合成超薄纳米棒提供了一种新颖的低温、绿色且廉价的途径，为传感器、太阳能电池、催化剂、水处理和其他应用提供了新的材料形式。
A novel template- and surfactant-free low temperature solution-phase method has been successfully developed for the controlled synthesis of ultrathin SnO(2) single-crystalline nanorods for the first time. The ultrathin SnO(2) single-crystalline nanorods are 2.0 +/- 0.5 nm in diameter, which is smaller than its exciton Bohr radius. The ultrathin SnO(2) nanorods show a high specific area (191.5 m(2) g(-1)). Such a thin SnO(2) single-crystalline nanorod is new in the family of SnO(2) nanostrucures and presents a strong quantum confinement effect. Its formation depends on the reaction temperature as well as on the concentration of the urea solution. A nonclassical crystallization process, Ostwald ripening process followed by an oriented attachment mechanism, is proposed based on the detailed observations from a time-dependent crystal evolution process. Importantly, such structured SnO(2) has shown a strong structure-induced enhancement of gas-sensing properties and has exhibited greatly enhanced gas-sensing property for the detection of ethanol than that of other structured SnO(2), such as the powders of nanobelts and microrods. Moreover, these ultrathin SnO(2) nanorods exhibit excellent ability to remove organic pollutant in wastewater by enormous surface adsorption. These properties are mainly attributed to its higher surface-to-volume ratio and ultrathin diameter. This work provides a novel low temperature, green, and inexpensive pathway to the synthesis of ultrathin nanorods, offering a new material form for sensors, solar cells, catalysts, water treatments, and other applications.