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Sensors 2018, 18(12), 4304; https://doi.org/10.3390/s18124304

Highly Sensitive Detection of 4-Methylimidazole Using a Terahertz Metamaterial

1
Pohang Accelerator Laboratory, 80 Jigokro-127-beongil, Nam-Gu, Pohang, Gyeongbuk 37673, Korea
2
Research Group of Food Processing, Korea Food Research Institute, 245, Nongsaengmyeong-ro, Iseo-myeon, Wanju-gun, Jeollabuk-do 55365, Korea
3
Research Group of Consumer Safety, Korea Food Research Institute, 245, Nongsaengmyeong-ro, Iseo-myeon, Wanju-gun, Jeollabuk-do 55365, Korea
*
Author to whom correspondence should be addressed.
Received: 17 October 2018 / Revised: 3 December 2018 / Accepted: 4 December 2018 / Published: 6 December 2018
(This article belongs to the Section Physical Sensors)
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Abstract

In this study, we demonstrated a highly sensitive detection method of 4-methylimidazole (4-MeI), a carcinogenic material, by using a terahertz (THz) metamaterial at a THz region. The THz metamaterials were fabricated with a metal array, using an electric-field-coupled inductor-capacitor (ELC) resonator structure, and a finite-difference time-domain (FDTD) simulation showed good agreement with the experimental results. We measured the THz spectra of the metamaterials to detect the 4-MeI concentrations of 0, 1, 2, 5, 10, 15, and 20 mg/L. The resonance frequency of the metamaterial was shifted by, approximately, 8 GHz and transmittance at the resonance frequency increased to 2 × 10−3, as the concentration was increased, up to 20 mg/L. Our study provides new insight into the application of metamaterials in detecting carcinogens, using a THz technique. View Full-Text
Keywords: THz spectroscopy; 4-methylimidazole; metamaterial; carcinogen detection THz spectroscopy; 4-methylimidazole; metamaterial; carcinogen detection
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Shin, H.J.; Jang, H.W.; Ok, G. Highly Sensitive Detection of 4-Methylimidazole Using a Terahertz Metamaterial. Sensors 2018, 18, 4304.

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