论文部分内容阅读
采用旋转甩涂法将甲基紫传感薄膜固定在特制的锡(Sn2+,Sn4+)掺杂玻璃光波导(Sn doped glass slide)表面,研究了该传感薄膜与HCl、H2S、以及SO2作用前后的可见吸收光谱的变化,并在此基础上研制了玻璃光波导酸性气体(HCl、H2S、SO2)传感元件。传感薄膜与酸性气体作用时,薄膜的颜色发生变化,从而降低薄膜对倏逝波的吸收,使传感器的输出光强度(信号)增强。本文采用流动注射法对酸性气体进行了检测。实验结果表明,在室温下,该传感元件对硫化氢气体具有明显的响应,而对相同浓度的其他酸性气体的响应相对较小,对浓度在6×10-4～2.5×10-5(V/V)的硫化氢气体具有良好的线性响应(R=0.9979,n=4),相对标准偏差(RSD)为±3.5%,具有响应快、可逆性和重复性好、容易制备、可以在室温下工作等特点。
The thin film of methyl violet sensor was fixed on the surface of Sn doped glass slide with tin (Sn2 +, Sn4 +) by spin-coating method. The effects of HCl, H2S and SO2 on the surface of Sn- The change of visible absorption spectrum was also studied. On the basis of this, a glass optical waveguide acid gas (HCl, H2S, SO2) sensing element was developed. Sensing film and acid gas, the color of the film changes, thereby reducing the film absorption of evanescent waves, so that the sensor output light intensity (signal) enhanced. In this paper, flow injection method for the detection of acid gas. The experimental results show that at room temperature, the sensing element has a significant response to hydrogen sulfide gas, while the response to other acid gases of the same concentration is relatively small. For the concentration of 6 ~ 10-4 ~ 2.5 × 10-5 V / V) has good linear response (R = 0.9979, n = 4) and relative standard deviation (RSD) of ± 3.5% with fast response, good reversibility and repeatability and easy preparation. Working at room temperature and other characteristics.