| Title: | Smartphone-Based Microfluidic Colorimetric Sensor for Gaseous Formaldehyde Determination with High Sensitivity and Selectivity |
| Author(s): | Guo XL; Chen Y; Jiang HL; Qiu XB; Yu DL; |
| Address: | "College of Information Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China. gxl@mail.buct.edu.cn. Institute of Microelectronics, Tsinghua University, Beijing 100084, China. ychen2011@tsinghua.edu.cn. Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada. jianghonglanhit@163.com. College of Information Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China. xbqiu@mail.buct.edu.cn. College of Information Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China. dyu@mail.buct.edu.cn" |
| ISSN/ISBN: | 1424-8220 (Electronic) 1424-8220 (Linking) |
| Abstract: | "Formaldehyde is one of the most dangerous air pollutants, which can cause sick building syndrome. Thus, it is very crucial to precisely determine formaldehyde with a low cost and simple operation. In this paper, a smartphone-based microfluidic colorimetric sensor is devised for gaseous formaldehyde determination with high sensitivity and selectivity. Specifically, a novel microfluidic chip is proposed based on the 4-aminohydrazine-5-mercapto-1,2,4-triazole (AHMT) method to determine formaldehyde; the chip consists of two reagent reservoirs, one reaction reservoir and a mixing column. In this design to prevent the fluid from flowing out while letting the gas molecule in, a hydrophobic porous poly tetra fluoroethylene (PTFE) membrane is put on the top of the reaction reservoir. Using the microfluidic chip sensor, a smartphone-based formaldehyde determination system is developed, which makes the measuring process automated and simple. As per the experiment results, the limit-of-detection (LOD) of the system is as low as 0.01 ppm, which is much lower than the maximum exposure concentration (0.08 ppm) recommended by the World Health Organization (WHO). Moreover, the sensor is hardly affected by acetaldehyde, volatile organic compounds (VOCs) or acidic-alkaline, which shows great selectivity. Finally, the performance of the proposed sensor is verified by using it for the determination of formaldehyde in a newly decorated house" |
| Keywords: | formaldehyde sensor microfluidic chip smartphone; |
| Notes: | "PubMed-not-MEDLINEGuo, Xiao-Liang Chen, Yan Jiang, Hong-Lan Qiu, Xian-Bo Yu, Du-Li eng buctrc201814/Central University Fund of China/ Switzerland 2018/09/21 Sensors (Basel). 2018 Sep 18; 18(9):3141. doi: 10.3390/s18093141" |
