Volatile Organic Compound Sensing Array and Optoelectronic Filter System using Ion-Pairing Dyes with a Wide Visible Spectrum

Donghyun Kim, Ki Seob Hwang, Won Gun Koh, Chanmin Lee, Jun Young Lee

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


An ideal dye-based sensing array has essential design requirements, including facile preparation methodology, tolerance to water vapor, a broad range of color-responsive changes, and a simple readout system. Here, a brief synthetic route is developed for ion-pairing dyes exhibiting unusual chromatic changes across the entire visible spectrum. It requires only mixing and precipitation under mild conditions. The dyes are applied to a sensing array containing 12 sensing elements with different initial states. Owing to the numerous color variations of the dyes, the color map generated by the array is highly simple yet sufficiently accurate to distinguish among the different functional groups (such as amines, aldehydes, and carboxylic acids) as well as carbon chain lengths. Principle component analysis (PCA) demonstrates that volatile organic compounds (VOCs) can be well classified according to the color changes of the sensing array. The ion-pairing dyes are embedded into 3D stacked nanofibers via electrospinning, and function as effective harmful-gas (e.g., formaldehyde) sensors with sub-ppm theoretical detection limits (0.15 ppm). Finally, the 3D stacked nanofibers can be employed in an optoelectronic filter system that automatically checks for formaldehyde in the surroundings and also confirms the effective removal of the detected formaldehyde by the gas filter cartridge.

Original languageEnglish
Article number2203671
JournalAdvanced Materials
Issue number35
Publication statusPublished - 2022 Sept 1

Bibliographical note

Funding Information:
This work was supported by Korea Institute of Industrial Technology through “Development of inside solutions module to reduce harmful environmental factors in the atmosphere (EH‐22‐0010)” and “Development of eco‐friendly production system technology for total periodic resource cycle (EO‐22‐0007).”

Publisher Copyright:
© 2022 The Authors. Advanced Materials published by Wiley-VCH GmbH.

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering


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