A fiber-optic formic acid gas sensor based on molybdenum disulfide nanosheets and chitosan works at room temperature

Li, Jin; Chen, Gaoliang; Meng, Fanli

doi:10.1016/j.optlastec.2022.107975

Cited by 16 publications

(8 citation statements)

References 26 publications

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“…Relative humidity (RH) reflects the ratio between the actual water vapor pressure in the air and the saturated water vapor pressure at the current temperature. Accurate measurement of RH is essential in various practical applications, including medical experiments, industrial production [1] , construction, agriculture [2] , and home monitoring [3] . Compared to conventional electronic hygrometers, optical fiber sensors offer numerous benefits such as small size, resistance to corrosion and electromagnetic radio frequency interference, high potential for intelligence and digitization, and ease of establishing large-scale optical fiber networks [4] .…”

Section: Introductionmentioning

confidence: 99%

Dual-parameter balloon-type fiber optic sensor based on MIL-101 moisture-sensitive material

刘,

杨,

董

et al. 2024

Advanced Fiber Laser Conference (AFL2023)

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MIL-101 is a humidity-sensitive metal-organic framework (MOF) material. In this paper, a balloon-type optical fiber sensor based on the metal-organic framework is proposed, which uses a hybrid structure of fiber Bragg grating (FBG) and balloon-type curved optical fiber, and the humidity-sensitive material (MIL-101) is coated near the geometric center of the balloon-type optical fiber to form a laminated film (LF) structure. When the material absorbs water molecules, its refractive index changes, thus realizing the humidity sensitivity and sensing the temperature using FBG. Based on the above sensing mechanism, the structure realizes the dual parameter detection of temperature and relative humidity. The experimental results show that the fiber optic sensor has a relative humidity sensitivity of 221.6 pm/%RH and a temperature sensitivity of -74.58 pm/℃. This composite structure fiber optic sensor combined with new materials provides good technical conditions for achieving the measurement of ambient temperature and relative humidity.

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Section: Introductionmentioning

confidence: 99%

Dual-parameter balloon-type fiber optic sensor based on MIL-101 moisture-sensitive material

刘,

杨,

董

et al. 2024

Advanced Fiber Laser Conference (AFL2023)

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“…However, their use in electrochemical sensors often necessitates high-temperature operating conditions between 200−400 °C, which is far from ideal. 22,23 In the development of a practical fluorescent sensor, probe selection is critical. Among potential candidates, a family of azomethine-based dyes, specifically 4-hydroxy-5-(2-hydroxybenzylideneamino)-naphthalene-2,7-disulfonic acid (Az-H), are particularly interesting, because of several alluring features.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Alternatively, metal-oxide semiconductor-based sensors have been developed to detect FA under different conditions. However, their use in electrochemical sensors often necessitates high-temperature operating conditions between 200–400 °C, which is far from ideal. , …”

Section: Introductionmentioning

confidence: 99%

An Azomethine-H-Based Fluorogenic Sensor for Formic Acid

Potter,

Debnath,

Drover

et al. 2023

ACS Appl. Mater. Interfaces

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Formic acid (FA) is an important C 1 -containing feedstock that serves as a masked source of dihydrogen gas (H 2 ). To encourage the adoption of cleaner (noncarbonaceous) energy sources, FA detection and sensing is thus of considerable interest. Here, we examine the use of a commercially available dye, azomethine-H (Az-H), for FA sensing. Solution studies confirm that FA quenches both the absorbance and the luminescence properties of Az-H. FA was additionally found to attenuate a known Az-H (E)-to-(Z) conformational change, suggesting an Az-H/FA interaction, possibly through hydrogen bonding; this phenomenon was probed using 1 H NMR spectroscopy. Moving toward a solidstate sensor, the Az-H probe was incorporated into a gelatin-based matrix. On exposure to FA, the luminescence of this system was found to increase in a FA-dependent manner, attributed to the formation of stable hydrogen-bonded structures, facilitating a (Z)-to-(E) isomerization via imine protonation, allowing for production of the more luminescent (E)-isomer. This fluorogenic signal was used as a FA sensor with an estimated detection limit of ca. 0.4 ppb FA vapor. This work constitutes an important step toward a highly sensitive FA sensor in both the solution and solid state, opening new space for the detection of organic acids in differing chemical environments.

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“…The optical evanescent field can be excited in microfibers or nanofibers, which can effectively improve their sensitivity to around medium and environment [1]. Based on this detection mechanism, different types of microfiber sensors have been theoretically and experimentally verified with extremely high sensitivity and efficient optical interference effects [2][3][4]. Among the numerous microfiber sensing devices, the optical fiber interferometers with complex structures have been carefully designed and fabricated relying on the microoperating systems with high spatial resolution [5].…”

Section: Introductionmentioning

confidence: 99%

Refractive index sensing performance demonstration of reflective microfiber long taper elaborated by silver and silicon nanoparticles using seawater samples

Dang¹,

Wang²,

Wang³

et al. 2023

Phys. Scr.

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A refractive index fiber probe has been proposed based on a long-tapered microfiber, which was obtained from a long single-mode microfiber by the oxyhydrogen-flame-scanning and stretching method using a multifunctional fiber tapering machine. This microfiber probe was used to detect the refractive index of seawater samples with different concentrations by demodulating the intensity of reflected light. The refractive index sensing performance of the long-tapered microfibers elaborated by the low refractive index UV glue distributing silver nanoparticles and silicon nanoparticles were experimentally demonstrated, compared and analyzed. More stable spectra and sensing performance was obtained for the silicon nanoparticles compared to that of silver nanoparticles. Although a high average refractive index sensitivity of 13.047 dBm/RIU was obtained for the long-tapered microfiber coated by two layers of silver nanoparticle UV films. However, the quality of the corresponding spectra was severely damaged, and the amplitude of light intensity at different wavelengths varied greatly. These problems can be well avoided for the silicon nanoparticle-decorated microfiber tapers, where the overall monotonic variation of the interference spectral intensity will greatly simplify the signal demodulation process and improve the reliability of the measurement results.

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A fiber-optic formic acid gas sensor based on molybdenum disulfide nanosheets and chitosan works at room temperature

Cited by 16 publications

References 26 publications

Dual-parameter balloon-type fiber optic sensor based on MIL-101 moisture-sensitive material

Dual-parameter balloon-type fiber optic sensor based on MIL-101 moisture-sensitive material

An Azomethine-H-Based Fluorogenic Sensor for Formic Acid

Refractive index sensing performance demonstration of reflective microfiber long taper elaborated by silver and silicon nanoparticles using seawater samples

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