A Perovskite-Based Paper Microfluidic Sensor for Haloalkane Assays
| Autor: | Huanghao Yang, Jie Zan, Qinxia Wu, Xiaofeng Chen, Lili Xie, Qiushui Chen, Caihou Lin, Zhijian Yang, Xiangyu Ou |
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| Rok vydání: | 2021 |
| Předmět: |
Photoluminescence
Materials science Haloalkane Wearable sensing Microfluidics microfluidic Nanoprobe Nanotechnology 02 engineering and technology 010402 general chemistry 01 natural sciences colorimetric Electron transfer anion exchange haloalkanes QD1-999 perovskite Original Research Perovskite (structure) chemistry.chemical_classification General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Chemistry chemistry Nanocrystal 0210 nano-technology |
| Zdroj: | Frontiers in Chemistry, Vol 9 (2021) Frontiers in Chemistry |
| ISSN: | 2296-2646 |
| DOI: | 10.3389/fchem.2021.682006 |
| Popis: | Detection of haloalkanes is of great industrial and scientific importance because some haloalkanes are found serious biological and atmospheric issues. The development of a flexible, wearable sensing device for haloalkane assays is highly desired. Here, we develop a paper-based microfluidic sensor to achieve low-cost, high-throughput, and convenient detection of haloalkanes using perovskite nanocrystals as a nanoprobe through anion exchanging. We demonstrate that the CsPbX3 (X = Cl, Br, or I) nanocrystals are selectively and sensitively in response to haloalkanes (CH2Cl2, CH2Br2), and their concentrations can be determined as a function of photoluminescence spectral shifts of perovskite nanocrystals. In particular, an addition of nucleophilic trialkyl phosphines (TOP) or a UV-photon-induced electron transfer from CsPbX3 nanocrystals is responsible for achieving fast sensing of haloalkanes. We further fabricate a paper-based multichannel microfluidic sensor to implement fast colorimetric assays of CH2Cl2 and CH2Br2. We also demonstrate a direct experimental observation on chemical kinetics of anion exchanging in lead-halide perovskite nanocrystals using a slow solvent diffusion strategy. Our studies may offer an opportunity to develop flexible, wearable microfluidic sensors for haloalkane sensing, and advance the in-depth fundamental understanding of the physical origin of anion-exchanged nanocrystals. |
| Databáze: | OpenAIRE |
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