Study on Combined Optical and Electrochemical Analysis Using Indium‐tin‐oxide‐coated Optical Fiber Sensor

Śmietana, Mateusz; Niedziałkowski, Paweł; Białobrzeska, Wioleta; Burnat, Dariusz; Sezemsky, Petr; Koba, Marcin; Straňák, Vítězslav; Siuzdak, Katarzyna; Ossowski, Tadeusz; Bogdanowicz, Robert

doi:10.1002/elan.201800638

Cited by 20 publications

(7 citation statements)

References 37 publications

(50 reference statements)

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“…In general, current follows E , and the changes in current show capacitive character. Capacitive current originates from the alternate charging and discharging of the electrical double layer formed at the electrode–electrolyte interface . The magnitude of this current is mainly related to the area of the sensor’s surface.…”

Section: Resultsmentioning

confidence: 99%

“…Capacitive current originates from the alternate charging and discharging of the electrical double layer formed at the electrode−electrolyte interface. 52 The magnitude of this current is mainly related to the area of the sensor's surface. However, reducing the ITO-coated area would also affect the LMR, mainly its absorption depth profile.…”

Section: Experimental Studies On the Dielectric Layer Impact On The E...mentioning

confidence: 99%

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Electro-Optically Modulated Lossy-Mode Resonance─A New Approach for Label-Free Sensing

Śmietana,

Burnat,

Curda

et al. 2024

ACS Photonics

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In this work, we report studies on the impact of thin dielectric layer formation on the optical, electrochemical, and electro-optically modulated responses of an indium tin oxide (ITO)-coated optical fiber sensor. The properties of ITO, such as optical transparency, high refractive index, and electrochemical activity, make it possible to obtain a lossy-mode resonance (LMR) effect in the optical domain and simultaneously use the sensor as an electrode in the electrochemical domain. The dielectric layer has been obtained on the ITO surface with precision down to a single nanometer using the atomic layer deposition (ALD) method. It is considered a reference to forming a biological or chemical layer during label-free sensing applications of such dual-domain sensors. It has been found that the sensor responds in both optical and electrochemical domains to the formation of a coating on the ITO surface. Numerical and experimental studies have proven that there is also a strong impact of the dielectric layer on the electro-optical modulation effectiveness. Changes in ITO's refractive index and extinction coefficient at its interface with the layer are induced by the modulation of free charge carriers' density. It has been shown that changes in the thickness of the dielectric layer, down to tenths of nanometers, can be precisely monitored when modulation is applied. Such an attribute is hardly possible when standard optical measurements, i.e., without modulation are considered. The findings open new opportunities for using electro-optical modulation in label-free sensing and biosensing, especially when small biological species or their low concentrations are targeted.

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Section: Resultsmentioning

confidence: 99%

Section: Experimental Studies On the Dielectric Layer Impact On The E...mentioning

confidence: 99%

Electro-Optically Modulated Lossy-Mode Resonance─A New Approach for Label-Free Sensing

Śmietana,

Burnat,

Curda

et al. 2024

ACS Photonics

Self Cite

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“…We concluded that the ITO could lead to the enhancement of the electrochemical signals and the optical signals based on the LMR phenomenon. In the past, it has already been demonstrated that dual-domain sensing capability in electrochemical and optical domains can be offered by LMR sensors based on ITO film [ 50 ]. Moreover, ITO is assumed to be selective for the detection of the antibiotic ciprofloxacin.…”

Section: Introductionmentioning

confidence: 99%

Design Considerations of an ITO-Coated U-Shaped Fiber Optic LMR Biosensor for the Detection of Antibiotic Ciprofloxacin

Vikas

Saccomandi

2023

Biosensors

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The extensive use of antibiotics has become a serious concern due to certain deficiencies in wastewater facilities, their resistance to removal, and their toxic effects on the natural environment. Therefore, substantial attention has been given to the detection of antibiotics because of their potential detriment to the ecosystem and human health. In the present study, a novel design of indium tin oxide (ITO) coated U-shaped fiber optic lossy mode resonance (LMR) biosensor is presented for the sensitive detection of the antibiotic ciprofloxacin (CIP). The performance of the designed U-shaped LMR sensor is characterized in terms of its sensitivity, full width at half maximum (FWHM), the figure of merit (FOM), and the limit of detection (LOD). For the proposed U-shaped LMR sensing probe, the various crucial factors such as the thickness (d) of the ITO layer, sensing region length (L), and bending radius (R) are optimized. The thickness of the ITO layer is optimized in such a way that two LMR curves are observed in the transmission spectrum and, thereafter, the performance parameters are evaluated for each LMR. It is observed that the designed U-shaped LMR sensor with optimized parameters shows an approximately seven-fold enhancement in sensitivity compared to the straight-core fiber optic LMR sensor. The numerical results revealed that the designed U-shaped fiber optic LMR biosensor can provide a maximum sensitivity of 17,209.9 nm/RIU with the highest FOM of 91.42 RIU−1, and LOD of 6.3 × 10−5 RIU for the detection of CIP hydrochloride in the concentration range of 0.001 to 0.029 mol∙dm−3. Thus, it is believed that the designed LMR biosensor can practically explore its potential use in environmental monitoring and biomedical applications and hence, opens a new window of opportunity for the researchers working in the field of U-shaped fiber optic LMR biosensing.

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“…Specifically, we determine the refractive index and electroactive species with the LMR fiber sensor under an applied potential. LMR sensors with an ITO electrode were reported by Śmietana et al, [30][31][32] who investigated the sensor's optical response, effect of electrolyte, and applicability to biosensing (specifically, to avidin-biotin interaction). Our present study introduces two types of novel LMR sensing techniques for determining refractive indices of materials during the potential application.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Lossy Mode Resonance‐based Fiber Optic Sensing for Electroactive Species

et al. 2022

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We present an electrochemical‐lossy mode resonance (LMR) sensing method that detects refractive indices and electroactive species. The LMR peaks of indium‐tin‐oxide in the transmittance‐wavelength spectra were significantly shifted as the applied potential between 1.0 and −0.5 V at 209 nm/V. The modulation was exploited for sensing the refractive index and electroactive species (ferrocyanide and methylene blue) in two ways: peak‐wavelength tracking and potential scanning. The potential‐scanning technique produced clear potential LMR peaks in the transmittance‐potential spectra for the first time, which were corresponded to the external refractive index. Meanwhile, the limits of detection of ferrocyanide and methylene blue were 7.5 and 25.3 μM, respectively, in peak‐wavelength tracking and 18.2 and 20.8 μM, respectively, in the potential scanning technique.

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Study on Combined Optical and Electrochemical Analysis Using Indium‐tin‐oxide‐coated Optical Fiber Sensor

Cited by 20 publications

References 37 publications

Electro-Optically Modulated Lossy-Mode Resonance─A New Approach for Label-Free Sensing

Electro-Optically Modulated Lossy-Mode Resonance─A New Approach for Label-Free Sensing

Design Considerations of an ITO-Coated U-Shaped Fiber Optic LMR Biosensor for the Detection of Antibiotic Ciprofloxacin

Electrochemical Lossy Mode Resonance‐based Fiber Optic Sensing for Electroactive Species

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