A planar optical glass-slide-based dimethylamine (DMA) sensor was fabricated with composite thin film of cresol red and titanium dioxide as the sensing layer and tin-diffused planar glass slide as the substrate. The UV-visible spectrum before and after analyte exposure was investigated to detect the color transformation of sensing layer and to select a laser light source wavelength (532 nm). DMA detection response along with time were performed on an optical waveguide system at room temperature. Experimental results show that this sensing film had not only fast response (6 s) but also rapid recovery (21 s) (${0.004}\;{{\rm mg/m}^3}$). Besides, detection is available for DMA solution as low as ${0.0008}\;{{\rm mg/m}^3}$ concentration with signal-to-noise ratio (S/N) 5.29. The sensing film is stable for one month at ambient temperature, and the response reaction is reversible.

中文翻译：

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含甲酚红/ TiO ₂复合薄膜的平面光波导基二甲基胺传感器

以甲酚红和二氧化钛的复合薄膜为感测层，以锡扩散的平面玻璃片为基底，制备了一种基于平面光学玻璃片的二甲基胺（DMA）传感器。研究了分析物暴露之前和之后的紫外可见光谱，以检测传感层的颜色变化并选择激光光源波长（532 nm）。DMA检测响应随时间在室温下在光波导系统上执行。实验结果表明，该感测膜不仅具有快速响应（6 s），而且具有快速恢复（21 s）（$ {0.004} \; {{\ rm mg / m} ^ 3} $）。此外，DMA解决方案还可以检测到低至$ {0.0008} \; {{\ rm mg / m} ^ 3} $信噪比（S / N）为5.29的浓度。感测膜在环境温度下稳定一个月，并且反应是可逆的。