Abstract
Reliable field techniques for sensing and mapping environmental contamination has the potential to revolutionize environmental monitoring, among which smartphone-based sensors (SPSs) are playing an increasing role owing to the low cost and the widespread ownership of smartphone. How to integrate more functions on SPSs has been a hot field of research. In this study, a dual-functional SPS for colorimetric and chemiluminescence detection were developed through simple and efficient light path design within an integrated 3D-printed attachment, and the smartphone application design makes it possible for simpler analysis, storage and transmission of data. In colorimetric detection, due to the use of white LED and diffraction grating, this sensor could determinate samples in various color, and five contaminants, including fluoride, ammonia nitrogen, orthophosphate, turbidity, and chlorine, were detected with good reliability. The chemiluminescence determination of H2O2 indicated broader potential application fields. As a successful case study, this SPS was used to map the fluoride concentration of surface water in Suzhou (China) with good sensitivity (0.06 mg/L limit of detection, 0.1∼2 mg/L linear range). In summary, the dual-functional and on-site sensing capabilities of this SPS show prospects in the field of environmental monitoring, even in medical diagnosis, food safety and so on.
Published Version
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