Department of Electronics Technology, University Carlos III , Madrid, 28911, Spain.
Anal Chem. 2017 Feb 7;89(3):1697-1703. doi: 10.1021/acs.analchem.6b03901. Epub 2017 Jan 10.
In this work we present a full-passive flexible multigas sensing tag for the determination of oxygen, carbon dioxide, ammonia, and relative humidity readable by a smartphone. This tag is based on near field communication (NFC) technology for energy harvesting and data transmission to a smartphone. The gas sensors show an optic response that is read through high-resolution digital color detectors. A white LED is used as the common optical excitation source for all the sensors. Only a reduced electronics with very low power consumption is required for the reading of the optical responses and data transmission to a remote user. An application for the Android operating system has been developed for the power supplying and data reception from the tag. The responses of the sensors have been calibrated and fitted to simple functions, allowing a fast prediction of the gases concentration. Cross-sensitivity has also been evaluated, finding that in most of the cases it is negligible or easily correctable using the rest of the readings. The election of the target gases has been due to their importance in the monitoring of modified atmosphere packaging. The resolutions and limits of detection measured are suitable for such kinds of applications.
在这项工作中，我们提出了一种全被动的柔性多气体感应标签，用于通过智能手机读取氧气、二氧化碳、氨和相对湿度。该标签基于近场通信（NFC）技术，用于能量收集和数据传输到智能手机。气体传感器显示光学响应，通过高分辨率数字彩色探测器进行读取。一个白色的 LED 被用作所有传感器的通用光学激发源。对于光学响应的读取和向远程用户传输数据，仅需要非常低功耗的简化电子设备。已经为 Android 操作系统开发了一个应用程序，用于从标签供电和接收数据。已经对传感器的响应进行了校准和拟合到简单的函数，允许快速预测气体浓度。还评估了交叉灵敏度，发现大多数情况下可以忽略不计，或者可以使用其余读数轻松校正。目标气体的选择是由于它们在监测改良气氛包装中的重要性。测量的分辨率和检测限适用于此类应用。
