Reflective Diffraction Gratings From Hydrogels as Biochemical Sensors

Chang, Chun‐Li; Ding, Zhao; Patchigolla, Venkata N. L. R.; Ziaie, Babak; Savran, Cagri A.

doi:10.1109/jsen.2012.2189382

Cited by 17 publications

(14 citation statements)

References 26 publications

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“…The disadvantage of grating-based sensors is that the light beam is incident through the sample solution usually, which may give some inaccuracies if the sample is absorptive [29][30][31]. In our proposal, the light is incident on the bottom grating, that does not have any interaction with an external medium (gas or liquid) filled in the gap and surface region of top grating, as shown in the inlet in Fig.…”

Section: Sensing Performance Analysismentioning

confidence: 99%

Fano resonance and tunability of optical response in double-sided dielectric gratings

Zheng

Zhao

Qian

et al. 2016

Optics Communications

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Section: Sensing Performance Analysismentioning

confidence: 99%

Fano resonance and tunability of optical response in double-sided dielectric gratings

Zheng

Zhao

Qian

et al. 2016

Optics Communications

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“…They measure the pH value of a given fluid by observing optical parameters such as absorption, reflection, transmission of optical power, and fluorescence. On the other hand, wavelength-modulated pH sensors use a pH-sensitive hydrogel with an optical-fiber Bragg grating [36], a long period grating [37], or a reflective diffraction grating [38]. Constructing intensity-modulation pH sensors is easy, but their sensitivity is low, and fluctuations in the light intensity affect the pH measurement.…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive and Wide-Dynamic-Range Multichannel Optical-Fiber pH Sensor Based on PWM Technique

Khan

Kang

2016

Sensors

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In this study, we propose a highly sensitive multichannel pH sensor that is based on an optical-fiber pulse width modulation (PWM) technique. According to the optical-fiber PWM method, the received sensing signal’s pulse width changes when the optical-fiber pH sensing-element of the array comes into contact with pH buffer solutions. The proposed optical-fiber PWM pH-sensing system offers a linear sensing response over a wide range of pH values from 2 to 12, with a high pH-sensing ability. The sensitivity of the proposed pH sensor is 0.46 µs/pH, and the correlation coefficient R2 is approximately 0.997. Additional advantages of the proposed optical-fiber PWM pH sensor include a short/fast response-time of about 8 s, good reproducibility properties with a relative standard deviation (RSD) of about 0.019, easy fabrication, low cost, small size, reusability of the optical-fiber sensing-element, and the capability of remote sensing. Finally, the performance of the proposed PWM pH sensor was compared with that of potentiometric, optical-fiber modal interferometer, and optical-fiber Fabry–Perot interferometer pH sensors with respect to dynamic range width, linearity as well as response and recovery times. We observed that the proposed sensing systems have better sensing abilities than the above-mentioned pH sensors.

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“…More recently, environmentally sensitive hydrogels used as smart chemo-mechanical transducers have been exploited to fabricate passive wireless chemical sensors using MEMS technology [2][3][4]. These smart polymeric materials having a reversible swelling/shrinking behavior in response to physiological parameters such as pH, temperature, and blood glucose can be utilized in various biomedical applications as actuators, chemical sensors, and drug delivery systems [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

A wireless chemical sensor using ferroparticles embedded hydrogel

Park

Song

Chitnis

et al. 2013

2013 Transducers &Amp; Eurosensors XXVII: The 17th International Conference on Solid-State Sensors, Actuators and Microsystems

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In this paper, we present a wireless chemical sensor using ferroparticles-embedded hydrogel (ferrogel). Chemically triggered reversible swelling and de-swelling of ferrogel immobilized on top of a planar inductor results in a modulated inductance through two competing mechanisms; ferroparticle density and magnetic field passing through the volume-changing ferrogel. Overall, the effect of the magnetic flux passing through the ferrogel dominates, thus increasing the inductance as the ferrogel swells. The resulting inductance change can be remotely monitored through wireless tracking of the coil self-resonant frequency. A pH sensor based on poly (methacrylic acid-co-acrylamide) hydrogel was fabricated and tested. The test was carried out in a laser machine acrylic chamber with buffers of varying pH values flowing through while monitoring the resonant frequency with a network analyzer. The sensor shows sensitivity of 200 kHz/pH between pH values of 6 to 5 and 105 kHz/pH from 5 to 4 with approximately 30 minutes of response time.

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Reflective Diffraction Gratings From Hydrogels as Biochemical Sensors

Cited by 17 publications

References 26 publications

Fano resonance and tunability of optical response in double-sided dielectric gratings

Fano resonance and tunability of optical response in double-sided dielectric gratings

Highly Sensitive and Wide-Dynamic-Range Multichannel Optical-Fiber pH Sensor Based on PWM Technique

A wireless chemical sensor using ferroparticles embedded hydrogel

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