Fabrication and characterization of a highly sensitive surface plasmon resonance based fiber optic pH sensor utilizing high index layer and smart hydrogel

Singh, Sadhna; Gupta, Banshi D.

doi:10.1016/j.snb.2012.06.089

Cited by 69 publications

(34 citation statements)

References 28 publications

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“…6.10. 9 The layer of silicon is added between silver and hydrogel for the enhancement of the sensitivity of the sensor as has been mentioned in Sec. 6.2.…”

Section: Silver/silicon/hydrogel Based Ph Sensormentioning

confidence: 99%

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SPR based Sensing Applications

Gupta¹,

Srivastava²,

Verma³

2015

Fiber Optic Sensors Based on Plasmonics

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“…6.10. 9 The layer of silicon is added between silver and hydrogel for the enhancement of the sensitivity of the sensor as has been mentioned in Sec. 6.2.…”

Section: Silver/silicon/hydrogel Based Ph Sensormentioning

confidence: 99%

“…Reprinted from Ref. [9] with permission from Elsevier. the pH causes the swelling of hydrogel under electrostatic repulsion due to the ionization of carboxylic groups.…”

Section: Silver/silicon/hydrogel Based Ph Sensormentioning

confidence: 99%

SPR based Sensing Applications

Gupta¹,

Srivastava²,

Verma³

2015

Fiber Optic Sensors Based on Plasmonics

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“…This architecture has been applied for the fabrication of different optical fiber sensors. For example, in [126] a pH sensor was fabricated by adding a pH-sensitive hydrogel to a SPR supporting coating. In addition, different sensors based on SPR have been developed for the detection of volatile organic compounds (VOC), such as alkanes [127,128] or ammonia [129].…”

Section: Resonance-based Sensorsmentioning

confidence: 99%

Nanostructured Materials in Optical Fiber Sensing

Hernáez¹

2013

TOOPTSJ

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This work comprehends a review of nanostructured materials employed in the fabrication of optical fiber sensors in the last years. The continuous advances in nanofabrication techniques have enabled to manipulate the matter precisely producing well defined nanostructurated coatings or repetitive patterns at nanoscale level. The interactions of light with these nano-organized materials or patterns at the nanoscale level enable to observe interesting phenomena, such as interferometry, fluorescence, absorbance, resonances and many others which can be exploited in the fabrication of sensing devices. A particular case consists of optical fiber sensors, where the light travelling through an optical fiber interacts with the sensitive layer. The properties of the sensitive layer, such as the organization, physical properties, chemical bounds etc. will determine the sensing characteristics of the final device. The utilization of some of the most common nanostructured materials, such as polymers, nanoparticles, metals, metal oxides or biological coatings are reviewed here.

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“…Research studies have attempted to detect pH in the following areas: potentiometric [12], micro-electro-mechanical systems (MEMS) [13], capacitive [14], surface acoustic waves [15], complementary metal–oxide–semiconductor (CMOS) [16], carbon nanotubes [17,18], chemiresistors [19,20], red green blue (RGB) colors array [21], fluorescent [22], surface plasmon resonance (SPR) [23,24], localized surface plasmon resonance (LSPR) [25,26], etc. …”

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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Fabrication and characterization of a highly sensitive surface plasmon resonance based fiber optic pH sensor utilizing high index layer and smart hydrogel

Cited by 69 publications

References 28 publications

SPR based Sensing Applications

SPR based Sensing Applications

Nanostructured Materials in Optical Fiber Sensing

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

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