Martínez-Aviño Adria, de Diego-Llorente-Luque Maria, Molins-Legua Carmen, Campíns-Falcó Pilar
MINTOTA Research Group, Departament de Química Analítica, Facultat de Química, Universitat de València, Dr. Moliner 50, 46100 Burjassot, Valencia, Spain.
Polymers (Basel). 2022 Oct 12;14(20):4285. doi: 10.3390/polym14204285.
Sustainable and green sensors based on polydimethyl siloxane (PDMS) or cellulose polymers, as a case of study of the use of portable instrumentation joined to a smartphone, have been tested. A smartphone camera was used to obtain images and was also coupled to a minispectrometer, without and with an optical fiber probe to register spectra. To study light influence on the analytical signal, light-emitting diode (LED), halogen light and daylight have been assayed. A corrective palette of 24 colors and a set with 45 colors from different color ranges were used as the validation set. The results indicated that halogen light was the best option to obtain the spectra. However, for digital image analysis, it was the LED light that gave a greater approximation of the RGB values of the real colors. Based on these results, the spectra and the RGB components of PDMS solid sensors doped with 1,2-naphtoquinone-4-sulfonate (NQS) for the determination of ammonium in water or urea in urine, PDMS doped with Griess reagent for developing the assay of nitrite in waters and cellulose sensors for the determination of hydrogen sulfide in the atmospheres have been obtained. The results achieved were good in terms of sensitivity and linearity and were comparable to those obtained using a laboratory benchtop instrument. Several rules for selecting the most suitable light source to obtain the spectra and/or images have been established and an image correction method has been introduced.
基于聚二甲基硅氧烷（PDMS）或纤维素聚合物的可持续绿色传感器，作为将便携式仪器与智能手机结合使用的一个案例研究，已经过测试。使用智能手机摄像头获取图像，并且还将其与微型光谱仪耦合，在有无光纤探头的情况下记录光谱。为了研究光对分析信号的影响，对发光二极管（LED）、卤素灯和日光进行了测试。使用24种颜色的校正调色板和来自不同颜色范围的45种颜色的集合作为验证集。结果表明，卤素灯是获取光谱的最佳选择。然而，对于数字图像分析，LED灯能更接近真实颜色的RGB值。基于这些结果，已获得用于测定水中铵或尿液中尿素的掺杂1,2 - 萘醌 - 4 - 磺酸盐（NQS）的PDMS固体传感器的光谱和RGB成分、用于开展水中亚硝酸盐测定的掺杂格里斯试剂的PDMS以及用于测定大气中硫化氢的纤维素传感器的光谱和RGB成分。在灵敏度和线性方面取得的结果良好，并且与使用实验室台式仪器获得的结果相当。已经建立了几条选择最合适光源以获取光谱和/或图像的规则，并引入了一种图像校正方法。
