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Real-Time Detection of Sub-ppm Aromatic Compounds in Alcohol by Surface Plasmon Resonance Using Label-Free Graphene

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Authors

Cho, Sung Hwan; Suh, Jun Min; Kim, Wontaek; Kim, Jaehyun; Kim, Yeong Jae; Lee, Tae Hyung; Kim, Jae Young; Sim, Jaegun; Choi, Seung Won; Hong, Byung Hee; Kim, So Young; Jang, Ho Won

Issue Date
2025-01
Publisher
WILEY
Citation
Energy & Environmental Materials, Vol.8 No.1, p. e12801
Abstract
The increasing importance of high-purity isopropyl alcohol (IPA) in semiconductor processing technology has led to a higher demand for technologies capable of detecting impurities in IPA. Although accurate and various impurity detection technologies have been developed, most of them have limitations in real-time and repeatable detection of impurities. Herein, for the first time, surface plasmon resonance (SPR) sensor was developed utilizing graphene transferred Au film (Au/graphene) to detect sub-ppm levels of 2,4-dinitrophenol (2,4-DNP) dissolved in IPA and this sensor demonstrates the ability to detect 2,4-DNP in real-time with great reversibility. The adsorption of 2,4-DNP to graphene is found to be stronger than that for Au film because of noncovalent graphene pi-pi stacking interaction, and the effect of graphene is demonstrated through density function theory (DFT) calculations and enhancement in sensing performance of Au/graphene sensor. Additionally, the presence of noncovalent pi-pi stacking interaction between 2,4-DNP and graphene has been demonstrated by confirming the p-doping effect of graphene-based solution field-effect transistor measurements and consecutive Raman spectra analysis. This study offers experimental and theoretical insights into the adsorption kinetics of 2,4-DNP dissolved in IPA and provides promising perspectives for real-time sensing technology utilizing label-free graphene to detect impurities in high-purity cleaning agents.
URI
https://hdl.handle.net/10371/216385
DOI
https://doi.org/10.1002/eem2.12801
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  • College of Natural Sciences
  • Department of Chemistry
Research Area Nanofabrication and characterization, Nanomaterials Synthesis, Quantum mechanics and molecular dynamics simulation, 나노재료 합성, 나노제조 및 특성화, 양자역학 및 분자역학 시뮬레이션

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