State of the art in fiber optics sensors for heavy metals detection

Shakya, Amit Kumar; Singh, Surinder

doi:10.1016/j.optlastec.2022.108246

Cited by 36 publications

(10 citation statements)

References 161 publications

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“…Fiber optic sensors (FOSs) are one of the promising detection platforms for quantifying heavy metals. 8 FOS devices offer adequate accuracy, sensitivity, and limit of detection (LoD) with on-site detection capabilities. 9,10 Optical fiber sensing techniques based on evanescent wave absorbance, interferometry, surface plasmon resonance, and fluorescence have been reported for detecting toxic heavy metal ions such as Pb(II), Hg(II), and Cd(II).…”

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confidence: 99%

“…To circumvent these limitations, several sensing techniques have been explored to develop a field-deployable chromium sensor with high sensitivity at an affordable cost. Fiber optic sensors (FOSs) are one of the promising detection platforms for quantifying heavy metals . FOS devices offer adequate accuracy, sensitivity, and limit of detection (LoD) with on-site detection capabilities. , Optical fiber sensing techniques based on evanescent wave absorbance, interferometry, surface plasmon resonance, and fluorescence have been reported for detecting toxic heavy metal ions such as Pb(II), Hg(II), and Cd(II). − However, there are seldom studies on FOSs for Cr(VI) detection.…”

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confidence: 99%

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Metal–Organic Framework-Based Fiber Optic Sensor for Chromium(VI) Detection

et al. 2023

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This study demonstrates a novel fiber optic sensing strategy for selective adsorption and rapid detection of Cr(VI) ions by exploiting a suitable metal−organic framework matrix and the characteristic spectral absorption of Cr(VI) at 395 nm wavelength, respectively. U-bent fiber optic sensor (U-FOS) probes that exhibit remarkably high evanescent wave-based absorbance sensitivity were employed to efficiently detect the Cr(VI) ions that are adsorbed to a stable zeolitic imidazolate framework (ZIF-67) matrix immobilized on the probe surface. A facile technique was developed for the fabrication of ZIF-67-coated U-FOS probes (FOS/ZIF-67) involving an in situ deposition process followed by heat treatment. Selectivity of the FOS/ZIF-67 probes to Cr(VI) was confirmed by optical absorption spectral investigations with 14 other heavy metals and interfering ions. The sensor performance was evaluated with a compact light-emitting diode-photodetectorbased setup. FOS/ZIF-67 probes demonstrate an ability to detect Cr(VI) ions with a limit of detection of 1 ppb and a wide linear dynamic range from 0.005 to 100 ppm within a short response time of 5 to 10 min. These sensors show good recovery rates with real water samples and a shelf-life of at least 4 weeks under ambient conditions, thereby demonstrating their viability for real-world application.

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confidence: 99%

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Metal–Organic Framework-Based Fiber Optic Sensor for Chromium(VI) Detection

et al. 2023

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“…Children are more susceptible to organ damage and neurotoxicity, which may cause behavioral disorders, learning problems, and impaired growth in children's development. [10][11][12][13][14] Therefore, it is crucial to continuously monitor HMIs in the environment to prevent or reduce the potential harm they may cause.…”

Section: Significance Of Heavy Metal Detectionmentioning

confidence: 99%

“…The Environmental Quality Standards Directive List has identified several heavy metals as prime substances of concern in water quality, including arsenic (As), cadmium (Cd), copper (Cu), chromium (Cr), iron (Fe), lead (Pb), mercury (Hg), nickel (Ni), and zinc (Zn). [12][13][14][15][16] Although these elements are essential to life in trace quantities, they are hazardous to human health at higher concentrations. Heavy metals are a class of pollutants that pose significant challenges due to their toxicity and non-biodegradable nature.…”

Section: Significance Of Heavy Metal Detectionmentioning

confidence: 99%

Paper-Based Electrical Sensors for Aqueous Heavy Metal Ion Detections

Sun¹,

Chen²,

Wong³

2023

Preprint

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Trace levels of heavy metals such as lead, cadmium, mercury, and arsenic can have harmful effects on human health, causing damage to organs and the nervous system. As a result, it is essential to monitor heavy metal concentrations continuously and in real-time, with detection limits of less than nanomolar to reduce their impact on the environment and human health. The development of paper-based microfluidics in recent years has made it a promising platform for lab-on-a-chip devices capable of detecting heavy metals on a large scale and on-site for environmental purposes. This review article will introduce commonly used paper-based electrical sensing (including electrochemical, FETs, and chemiresistive sensors), existing fabrication and analysis techniques, and various application areas for these heavy metal ion sensors. Additionally, the challenges that must be addressed for paper-based sensors to realize their full potential and future outlooks will be discussed.

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“…However, these techniques are relatively expensive and, in most cases, require a complex and rigorous pre-treatment of the sample to be analyzed. In contrast, the electrochemical method has aroused widespread attention because of its advantages, such as its simple operation, its quick responsiveness, low cost, and high selectivity [ 3 , 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

β-Cyclodextrin/CMK-8-Based Electrochemical Sensor for Sensitive Detection of Cu2+

Bao

Liu

et al. 2022

Molecules

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In this work, β-cyclodextrin (β-CD)/mesoporous carbon (CMK-8) nanocomposite was synthesized and used as an electrochemical sensing platform for highly sensitive and selective detection of Cu2+. The morphology and structure of β-CD/CMK-8 were characterized by scanning electron microscope (SEM) and X-ray diffraction (XRD). In addition, the dates from electrochemical impedance spectroscopy (EIS) and Cyclic voltammetry (CV) demonstrated that the β-CD/CMK-8 possessed a fast electronic transfer rate and large effective surface area. Besides this, the β-CD/CMK-8 composite displayed high enrichment ability toward Cu2+. As a result of these impressive features, the β-CD/CMK-8 modified electrode provided a wide linear response ranging from 0.1 ng·L−1 to 1.0 mg·L−1 with a low detection limit of 0.3 ng·L−1. Furthermore, the repeatability, reproducibility and selectivity of β-CD/CMK-8 towards Cu2+ were commendable. The sensor could be used to detect Cu2+ in real samples. All in all, this work proposes a simple and sensitive method for Cu2+ detection, which provides a reference for the subsequent detection of HMIs.

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State of the art in fiber optics sensors for heavy metals detection

Cited by 36 publications

References 161 publications

Metal–Organic Framework-Based Fiber Optic Sensor for Chromium(VI) Detection

Metal–Organic Framework-Based Fiber Optic Sensor for Chromium(VI) Detection

Paper-Based Electrical Sensors for Aqueous Heavy Metal Ion Detections

β-Cyclodextrin/CMK-8-Based Electrochemical Sensor for Sensitive Detection of Cu2+

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