Nanotubular SnO2 templated by cellulose fibers:: Synthesis and gas sensing
Nanotubular SnO2 templated by cellulose fibers:: Synthesis and gas sensing
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DOI：
10.1021/cm047819m
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发表时间：
2005-06-28
影响因子：
8.6
通讯作者：
Kunitake, T
中科院分区：
文献类型：
--
作者：
Huang, J;Matsunaga, N;Kunitake, T
以天然纤维素物质（滤纸）为模板制备了SnO 2纳米管材料，并用扫描电镜（SEM）和透射电镜（TEM）对其形貌进行了表征。以Sn（（OPr）-Pr-i）（4）为前驱体，采用溶胶-凝胶法在纤维素纤维表面包覆SnO 2凝胶层，然后在空气中煅烧，得到SnO 2纳米管作为天然纤维素纤维的中空复制品。通过在450 ℃下煅烧获得的纳米管是无定形的，并且由尺寸小于约100 μ m的细颗粒组成。5nm。外径为几十到两百纳米，壁厚为10-15纳米。在1100 ℃下煅烧产生管状多晶SnO 2纳米笼（外径100-200 nm），其由尺寸为10-20 nm的金红石相SnO 2纳米笼组成。在300-900 ℃的温度范围内检查由煅烧所制备的SnO 2片获得的粉末的热行为和结晶性质。通过在300和900 ℃下煅烧获得的纳米颗粒的尺寸分别为2.0和9.2 nm，与TEM观察相当一致。需要高于500摄氏度的煅烧温度以获得纯SnO 2。由SnO 2纳米管片制造传感器设置，并且测量传感器对于H-2、CO和环氧乙烷的性能。传感器信号S在450 ℃至100 ppm H-2时为16.5，与传统SnO 2传感器的信号相当。最后，讨论了传感器特性与纳米管片形态的关系。
SnO2 nanotubular materials were prepared by using a natural cellulosic substance (filter paper) as template, and their morphologies were determined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Cellulose fibers were first coated with SnO2 gel layers by the surface sol-gel process using Sn((OPr)-Pr-i)(4) as precursor, followed by calcination in air to give SnO2 nanotubular materials as hollow replicas of natural cellulose fibers. The nanotubes obtained by calcination at 450 degrees C were amorphous-like and composed of fine particles with sizes smaller than ca. 5 nm. The outer diameters are tens to two hundred nanometers, and wall thicknesses are 10-15 nm. Calcination at 1100 degrees C yielded tubelike polycrystalline SnO2 nanocages (outer diameter 100-200 nm), which were composed of rutile-phase SnO2 nanocrystallites with sizes of 10-20 nm. The thermal behavior and the crystalline property of the powder obtained from calcination of the as-prepared SnO2 sheet were examined in the temperature range of 300-900 degrees C. The sizes of the nanoparticle obtained by calcination at 300 and 900 degrees C were 2.0 and 9.2 nm, respectively, in fair agreement with TEM observation. Calcination temperatures above 500 degrees C are needed to obtain pure SnO2. A sensor setup was fabricated from the SnO2 nanotube sheet, and the sensor performance was measured for H-2, CO, and ethylene oxide. The sensor signal, S, was 16.5 at 450 degrees C to 100 ppm H-2, and was comparable to that of the conventional SnO2 sensor. Finally, the sensor characteristics were discussed in relation to the morphology of the nanotube sheet.