Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 252, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2021.119515
Keywords
Aggregation-induced emission; Fluorescent sensor; Sensor array; Volatile organic compounds
Categories
Funding
- National Natural Science Foundation of China [51703135]
- Talents Project from Organization Department of Beijing [2017000020124G088]
- Beijing Municipal Education Commission
- Beijing Key Laboratory of Optical Materials and Photonic Devices
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The study synthesized a D-pi-A fluorophore DEBAB with AIE and ICT properties, which was applied in fabricating a portable gas-phase sensor capable of detecting methanol and ethanol with a detection limit as low as 8.02 ppm. The results suggest that hydrogen-bonding may be formed between DEBAB and alcohols, intensifying the AIE efficacy while influencing the ICT process.
The design strategy of aggregation-induced emission (AIE) fluorophores with donor-pi-acceptor (D-pi-A) conjugation structure has greatly contributed to the development of luminescent materials and devices, including volatile organic compounds (VOCs) sensors. In this work, a D-pi-A fluorophore DEBAB was synthesized, showing both AIE and intramolecular charge transfer (ICT) properties as confirmed by spectroscopic data and quantum chemical calculations. Furthermore, there is notable emission-enhancement when DEBAB is exposed to small-molecule alcohols, such as methanol and ethanol. Based on this phenomenon, a portable film sensor was fabricated, capable of detecting methanol and ethanol in gas phase, with detection limit (DL) as low as 8.02 ppm. Our systematic investigation suggests that hydrogen-bonding may be formed between DEBAB and alcohols, intensifying the AIE efficacy while influencing the ICT process. This working mechanism is supported by density functional theory (DFT) calculations including electrostatic potential mapping and molecular total energy. In addition, a sensor array was fabricated on a cellulose paper strip, showing different levels of emission changing in response to alcohols. Thus the detection and differentiation of methanol and ethanol are enabled. (C) 2021 Elsevier B.V. All rights reserved.
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