Environmental Science and Engineering Institute, Guangzhou University, 510006, Guangzhou, China.
Talanta. 2011 May 15;84(3):977-82. doi: 10.1016/j.talanta.2011.02.047. Epub 2011 Mar 4.
In the present work, two morphologies of SiO(2) nanomaterials (SiO(2) nanotubes and nanoparticles) have been successfully synthesized in supercritical fluids (SCFs). The cataluminescence (CTL) features of the two SiO(2) nanomaterials to some common harmful gases were compared, and the results showed that SiO(2) nanotubes had better CTL sensing characteristic to some common harmful gases. The SiO(2) nanotubes not only had uniform size and shape with a high specific surface area, but also exhibited superior sensitivity and selectivity to ethyl acetate vapor. Using the SiO(2) nanotubes as sensing material, a CTL sensor for ethyl acetate vapor was developed. The proposed sensor showed high sensitivity and specificity to ethyl acetate at optimal temperature of 293°C, a wavelength of 425 nm and a flow rate of 345 mL/min. With a detection limit of 0.85 ppm, the linear range of CTL intensity versus concentrations of ethyl acetate vapor was 2.0-2000 ppm. None or only very low levels of interference were observed while the foreign substances such as acetone, acetaldehyde, acetic acid, formaldehyde, ammonia, ethanol, benzene and methanol were passing through the sensor. This method allows rapid determination of gaseous ethyl acetate at workshop.
在本工作中，我们成功地在超临界流体（SCFs）中合成了两种形貌的二氧化硅纳米材料（二氧化硅纳米管和纳米颗粒）。比较了这两种二氧化硅纳米材料对一些常见有害气体的催化发光（CTL）特性，结果表明，二氧化硅纳米管对一些常见有害气体具有更好的 CTL 传感特性。二氧化硅纳米管不仅具有均匀的尺寸和形状，具有高的比表面积，而且对乙酸乙酯蒸气表现出优异的灵敏度和选择性。我们使用二氧化硅纳米管作为传感材料，开发了一种用于乙酸乙酯蒸气的 CTL 传感器。在最佳温度 293°C、波长 425nm 和流速 345mL/min 的条件下，该传感器对乙酸乙酯表现出高灵敏度和特异性。CTL 强度与乙酸乙酯蒸气浓度的线性范围为 2.0-2000ppm，检测限为 0.85ppm。当丙酮、乙醛、乙酸、甲醛、氨、乙醇、苯和甲醇等杂质通过传感器时，几乎没有或只有很低的干扰。该方法可用于车间中快速测定气态乙酸乙酯。
