Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 241, Issue -, Pages 607-613Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.10.124
Keywords
Carbon dots; Aerogel; VOCs; Gas sensors; Fluorescence quenching; Phenylenediamines
Funding
- Planning and Budgeting Committee (PBC) of the Israeli Council for Higher Education
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Detection of aromatic volatile organic compounds (VOCs) is important for monitoring occupational hazards, industrial safety, and environmental applications. Here, we present a new in-situ-synthesized carbon dot aerogel matrix and demonstrate its application for sensing aromatic VOCs. The composite aerogel exhibited high specific surface area and pore diameter, enabling efficient adsorption of the organic vapors. In particular, the excitation-dependent luminescence emission properties of the carbon dots were retained upon embedding within the aerogel host, and provided a sensitive transduction mechanism through both shifts and quenching of the fluorescence emissions. We show that distinct fluorescence shifts and degrees of quenching were induced by different aromatic VOC. In particular, the C-dot-aerogel sensor could distinguish between isomers of phenylenediamine, an important achievement which has not been previously demonstrated in VOC sensing platforms. (C) 2016 Elsevier B.V. All rights reserved.
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