All-Organic Waveguide Sensor for Volatile Solvent Sensing

Nitišs, Edgars; Tokmakovs, Andrejs; Busenbergs, Janis; Rutkis, Mārtiņš

doi:10.1007/s13320-019-0543-z

Cited by 8 publications

(3 citation statements)

References 46 publications

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“…Using the same approach, the LOD of the concentration were 1.3% for ethanol and 2.5% for isoprene. The sensitivity of our mid-IR waveguide is better than the refractive-index-based sensing using a visible waveguide because of the strong characteristic mid-IR C–H vibrational absorption 37 .…”

Section: Resultsmentioning

confidence: 99%

Detection of volatile organic compounds using mid-infrared silicon nitride waveguide sensors

Zhou

Husseini

et al. 2022

Sci Rep

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Mid-infrared (mid-IR) sensors consisting of silicon nitride (SiN) waveguides were designed and tested to detect volatile organic compounds (VOCs). SiN thin films, prepared by low-pressure chemical vapor deposition (LPCVD), have a broad mid-IR transparent region and a lower refractive index (nSiN = 2.0) than conventional materials such as Si (nSi = 3.4), which leads to a stronger evanescent wave and therefore higher sensitivity, as confirmed by a finite-difference eigenmode (FDE) calculation. Further, in-situ monitoring of three VOCs (acetone, ethanol, and isoprene) was experimentally demonstrated through characteristic absorption measurements at wavelengths λ = 3.0–3.6 μm. The SiN waveguide showed a five-fold sensitivity improvement over the Si waveguide due to its stronger evanescent field. To our knowledge, this is the first time SiN waveguides are used to perform on-chip mid-IR spectral measurements for VOC detection. Thus, the developed waveguide sensor has the potential to be used as a compact device module capable of monitoring multiple gaseous analytes for health, agricultural and environmental applications.

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Section: Resultsmentioning

confidence: 99%

Detection of volatile organic compounds using mid-infrared silicon nitride waveguide sensors

Zhou

Husseini

et al. 2022

Sci Rep

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“…The sensor was expected to be fully operational for 1–2 years. Fiber optic gas sensors are also possible using inorganic compounds [ 13 , 14 ]. It is possible to detect benzene, acetone, and isopropyl alcohol vapors by coating an optical fiber with nanocrystalline zinc oxide.…”

Section: Introductionmentioning

confidence: 99%

Curcuma longa-Based Optical Sensor for Hydrochloric Acid and Ammonia Vapor Detection

Juárez

Carrión

et al. 2023

Sensors

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In this research, we present a prototype optical system that offers significant advances in detecting hydrochloric acid (HCl) and ammonia (NH3) vapors. The system utilizes a natural pigment sensor based on Curcuma longa that is securely attached to a glass surface support. Through extensive development and testing with HCl (37% aqueous solution) and NH3 (29% aqueous solution) solutions, we have successfully demonstrated the effectiveness of our sensor. To facilitate the detection process, we have developed an injection system that exposes C. longa pigment films to the targeted vapors. The interaction between the vapors and the pigment films triggers a distinct color change, which is then analyzed by the detection system. By capturing the transmission spectra of the pigment film, our system allows a precise comparison of these spectra at different concentrations of the vapors. Our proposed sensor exhibits remarkable sensitivity, allowing the detection of HCl at a concentration of 0.009 ppm using only 100 µL (2.3 mg) of pigment film. In addition, it can detect NH3 at a concentration of 0.03 ppm with a 400 µL (9.2 mg) pigment film. Integrating C. longa as a natural pigment sensor in an optical system opens up new possibilities for detecting hazardous gases. The simplicity and efficiency of our system, combined with its sensitivity, make it an attractive tool in environmental monitoring and industrial safety applications.

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“…In recent years, photonic integrated circuits (PICs) based on polymeric materials have gained increasing attention by scientific community for an ever widening range of applications including optoelectronics 1 , sensors 2 , 3 , lighting 4 and optical computing 5 .…”

Section: Introductionmentioning

confidence: 99%

Identification of dyes and matrices for dye doped polymer waveguide emitters covering the visible spectrum

Paz

Caño‐García

Geday

et al. 2022

Sci Rep

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Polymer based photonic devices offer the possibility cost effective roll-to-roll manufacture of photonic devices. The incorporation of luminescent dopants within a solid polymer waveguide allows for the generation of light within the device avoiding tedious mechanical light coupling. However, when a dopant is embedded in a solid matrix, depending on its concentration and the nature of materials involved, the emitted light may be quenched due to aggregation effects. In this work, thin films and ridge waveguides processed by UV-photolithography have been successfully obtained from a selection of standard photopolymerizable organic monomers, SU8, EpoCore and OrmoStamp doped with a selection of standard dyes like Rhodamine-B, Coumarin-540A and Pyrromethene-580. All structures were manufactured on glass substrates. An analysis of the solubility and optical properties including band gap energy, absorption coefficient ($$\alpha $$ α ) and fluorescence of the doped photoresists at different concentrations has been performed. Photoresists doped with Rhodamine-B shows a higher energy of indirect allowed band gap transition (2.04–2.09 eV) compared to previously reported pure Rhodamine-B thin films (1.95–1.98 eV). Fabrication protocols of dye doped photoresists covering the entire visible spectrum is established.

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All-Organic Waveguide Sensor for Volatile Solvent Sensing

Cited by 8 publications

References 46 publications

Detection of volatile organic compounds using mid-infrared silicon nitride waveguide sensors

Detection of volatile organic compounds using mid-infrared silicon nitride waveguide sensors

Curcuma longa-Based Optical Sensor for Hydrochloric Acid and Ammonia Vapor Detection

Identification of dyes and matrices for dye doped polymer waveguide emitters covering the visible spectrum

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