A self-designed versatile and portable sensing device based on smart phone for colorimetric detection
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RESEARCH PAPER
A self-designed versatile and portable sensing device based on smart phone for colorimetric detection Binghan Li 1 & Jihong Wang 2 & Honghua Tu 2 & Zhijie Yang 1 & Dongfang Zhao 1 & Huanhuan Feng 1,3 & Jiao Yang 3,4 Received: 6 September 2020 / Accepted: 22 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract A UV-vis spectrometer, as a sort of important analytical instrument, has been widely used to analyze various substances. However, expensive equipment and skilled operators are required, which limits its broad applications for out-of-lab and daily measurements. In this work, a self-designed sensing device based on smart phone was developed as a sensitive, cost-effective, facile, and portable testing tool. The sensing device fabricated by 3D printing was used to lodge a sample solution and produce a light signal, and the optical sensor on a smart phone worked as a transducer. The light source in the device generated widewavelength radiation, which passed through an inner filter and only light of a designated wavelength reached the testing solution. The intensity of transmitted light was then measured by an optical sensor internally installed in most smart phones, where the signals were processed as well. The feasibility of our device was verified by detecting four kinds of common heavy metal ions in actual water samples, and the testing results showed good agreement with those obtained from the UV-vis spectrometer. This work is expected to shed some light on the construction of smart phone–based sensors, featuring decent portability, simple operation, low cost, high sensitivity, and good accuracy. Keywords Smart phones . Sensing device . Versatility . Potability . Colorimetric detection
Introduction Nowadays, analytical methods owning advantages of high sensitivity and precision, low cost, and fast response are very desirable for the determination of various substances. Numerous sensing platforms on the basis of various Supplementary Information The online version contains supplementary material available at https://doi.org/10.1007/s00216-02003024-6. * Huanhuan Feng [email protected] * Jiao Yang [email protected] 1
College of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen 518055, Guangdong, China
2
College of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen 518055, Guangdong, China
3
Flexible Printed Electronics Technology Center, Harbin Institute of Technology, Shenzhen 518055, Guangdong, China
4
College of Science, Harbin Institute of Technology, Shenzhen 518055, Guangdong, China
transducers including electrochemistry, colorimetry, surface plasma resonance (SPR), surface enhanced Raman scattering (SERS), and fluorescence [1–5] have been developed for such purpose. Among them, colorimetry with UV-vis spectrophotometer as transducer could be the most widely applied technique and covers numerous targets including ions, bioactive molecules, proteins, nucleic acids, and cells [5–10]. Though si
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