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利用旋转甩涂法将亚甲基蓝(MB)掺杂的硬脂酸溶液涂成薄膜固定在钾离子(K+)交换玻璃光波导表面上,研制了MB-硬脂酸复合薄膜/K+交换玻璃光波导传感器,并对酸性气体进行了检测.该复合薄膜与氯化氢(HCl)气体作用时,薄膜颜色从深蓝色变为浅蓝色,导致薄膜对倏逝波的吸收降低,使传感器的输出光强度增强.结果表明,在室温下该传感器对低浓度的氯化氢气体仍具有较好的重复性和选择性响应,可检测到体积分数为1×10-6%的HCl气体,响应和恢复时间分别为7和20 s,相对标准偏差为±6.06%.该传感器具有灵敏度高、响应-恢复速度快、可逆性好、成本低和容易制备等特点。
A MB-stearic acid composite thin film / K + exchange glass optical waveguide sensor was fabricated by spin-coating the methylene blue (MB) -doped stearic acid solution onto a K (K + , And the acid gas was detected.When the composite film and hydrogen chloride (HCl) gas act, the color of the film changes from dark blue to light blue, resulting in the film to reduce the absorption of evanescent wave, so that the output intensity of the sensor enhanced. The results show that the sensor still has good repeatability and selective response to low concentrations of hydrogen chloride gas at room temperature. The detection of HCl gas volume fraction of 1 × 10-6%, the response and recovery time were 7 and 20 s with a relative standard deviation of ± 6.06% .The sensor has the characteristics of high sensitivity, fast response-recovery, good reversibility, low cost and easy preparation.