Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 346, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2021.130454
Keywords
3D printed sensor; Optoelectronic device; Nanoparticles; Chemical sensing; Optical signal processing
Funding
- National Natural Science Foundation of China [31171684]
- Brew Microorganisms Technology and Application of Key Laboratory Project in Sichuan Province [NJ2020-03]
- Chongqing science and technology commission [CSTC2018jcyjAX0062, CSTC2015shmszxl20097]
- Chongqing Graduate Tutor Team Construction Project
- Analytical and Testing Center of Chongqing University for TEM
- sharing fund of Chongqing University's large equipment
- Scientific Research Foundation for High-level Talents of Chongqing City Management College [2020kyqd01, 2017kyqd01, 2017kyqd02]
- Application Technology Extension Center of Intelligent Precision Rehabilitation and Eldercare of Chongqing City Management College [KYPT201703]
- Research and Innovation Team Program of Chongqing City Management College [KYTD201710]
- Foundation for Higher Education Young Key Teacher of Chongqing
- project of science and technology research program of Chongqing Education Commission of China [KJQN201903312]
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In this study, a novel, portable, and automatic dual-readout device for carbamate pesticides detection was designed, fabricated, and functionally verified with low detection limits. The device integrated a low-cost, disposable microfluidic chip for nanomaterials and pesticides samples delivery, achieving dual-readout signals (fluorescence and color change) based on the cross-responsive mechanism of AuNPs. Additionally, a fluorescence difference patterns (spectra-fingerprint) were produced for specificity recognition among carbamate pesticides, indicating good selectivity and potential for home-based testing and environmental monitoring.
In the current study, we report here the design, fabrication and functional verification of a novel, portable and automatic dual-readout device for carbamate pesticides detection applications with low detection limits. This device integrated a 3D printed, low cost and disposable microfluidic chip to deliver nanomaterials and pesticides samples. Based on the cross-responsive mechanism and the agglomeration effect of AuNPs, two model signals (fluorescence and color change, dual-readout) were achieved from the response between pesticides and sensing materials. Simultaneously, a novel and unique fluorescence difference patterns (spectra-fingerprint) were produced based on cross-responsive mechanism for specificity recognition. The difference maps including color difference image and fluorescence difference spectra presented good selectivity among carbamate pesticides (six kinds of carbamate pesticides were successfully distinguished) or other categories in low concentration. By use of this dual-signal model, the device could achieve the lowest detectable concentrations for carbamate pesticides at ppb level with the practicability, reproducibility and stability estimated. Importantly, with the features of integration and instrumentation, the detector could be further employed for the home-based testing and environmental monitoring.
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