Highly Sensitive Carbon Nanotubes Coated Etched Fiber Bragg Grating Sensor for Humidity Sensing

Shivananju, Bannur Nanjunda; Yamdagni, Sumeet; Fazuldeen, R.; Kumar, A. K. Sarin; Nithin, S. P.; Varma, Manoj M.; Asokan, S.

doi:10.1109/jsen.2014.2312353

Cited by 50 publications

(34 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…CNTs, coated onto an etched FBG, provide the highest sensitivity found for conventional FBGs OFHS, which is 31 pm/%RH [33]. A representation of this optical device can be seen in Figure 4.…”

Section: Recent Trends In Optical Fiber Humidity Sensorsmentioning

confidence: 99%

Recent Developments in Fiber Optics Humidity Sensors

Ascorbe

Corres

Arregui

et al. 2017

Sensors

201

View full text Add to dashboard Cite

A wide range of applications such as health, human comfort, agriculture, food processing and storage, and electronic manufacturing, among others, require fast and accurate measurement of humidity. Sensors based on optical fibers present several advantages over electronic sensors and great research efforts have been made in recent years in this field. The present paper reports the current trends of optical fiber humidity sensors. The evolution of optical structures developed towards humidity sensing, as well as the novel materials used for this purpose, will be analyzed. Well-known optical structures, such as long-period fiber gratings or fiber Bragg gratings, are still being studied towards an enhancement of their sensitivity. Sensors based on lossy mode resonances constitute a platform that combines high sensitivity with low complexity, both in terms of their fabrication process and the equipment required. Novel structures, such as resonators, are being studied in order to improve the resolution of humidity sensors. Moreover, recent research on polymer optical fibers suggests that the sensitivity of this kind of sensor has not yet reached its limit. Therefore, there is still room for improvement in terms of sensitivity and resolution.

show abstract

Section: Recent Trends In Optical Fiber Humidity Sensorsmentioning

confidence: 99%

Recent Developments in Fiber Optics Humidity Sensors

Ascorbe

Corres

Arregui

et al. 2017

Sensors

201

View full text Add to dashboard Cite

show abstract

“…Moreover, the versatility of optical fibers to different functional nanocoatings has led to the integration with carbon allotropes for the development of optical fiber-based humidity sensors. Shivananju et al [147] reported an etched fiber Bragg grating (FBG) coated with CNTs at the etched region for humidity sensing. Due to the interaction between water molecules and the CNTs coating, the effective refractive index surrounding the core will change, resulting in a shift of the Bragg wavelength and a sensitivity of 31 pm/%RH within a linear detection range from 20-90 %RH.…”

Section: Humiditymentioning

confidence: 99%

“…The measured results obtained from the rGO/PS-coated optical microfiber exhibited a sensitivity of −0.224 dB/%RH and −4.118 dB/%RH for detection range 50.5-70.6 %RH and 79.5-85 %RH, correspondingly. Overall, Table 3 summarizes all carbon allotrope-based RH OFS and their respective sensing performance [134,[147][148][149][150][151][152][153][154][155][156][157][158][159][160][161][162].…”

Section: Humiditymentioning

confidence: 99%

Carbon Allotrope-Based Optical Fibers for Environmental and Biological Sensing: A Review

Yap

Chan

Tjin

et al. 2020

Sensors

View full text Add to dashboard Cite

Recently, carbon allotropes have received tremendous research interest and paved a new avenue for optical fiber sensing technology. Carbon allotropes exhibit unique sensing properties such as large surface to volume ratios, biocompatibility, and they can serve as molecule enrichers. Meanwhile, optical fibers possess a high degree of surface modification versatility that enables the incorporation of carbon allotropes as the functional coating for a wide range of detection tasks. Moreover, the combination of carbon allotropes and optical fibers also yields high sensitivity and specificity to monitor target molecules in the vicinity of the nanocoating surface. In this review, the development of carbon allotropes-based optical fiber sensors is studied. The first section provides an overview of four different types of carbon allotropes, including carbon nanotubes, carbon dots, graphene, and nanodiamonds. The second section discusses the synthesis approaches used to prepare these carbon allotropes, followed by some deposition techniques to functionalize the surface of the optical fiber, and the associated sensing mechanisms. Numerous applications that have benefitted from carbon allotrope-based optical fiber sensors such as temperature, strain, volatile organic compounds and biosensing applications are reviewed and summarized. Finally, a concluding section highlighting the technological deficiencies, challenges, and suggestions to overcome them is presented.2 of 43 of target molecules or physical parameters. In some instances, surface-modified carbon allotropes also permit multi-parameter detection capabilities of carbon allotrope-based OFS [7]. As such, an insight into the recent advances of carbon allotrope-based OFS can serve as a guideline to develop an effective detection approach for emerging real-world applications. Many review articles on carbon allotrope-based OFS mainly focus on a single type of carbon allotrope and the fundamental theory of carbon allotrope-based OFS [8,9]. Thus, this comprehensive review article encompasses the properties, preparation, sensing mechanisms, nanocoating deposition techniques, physical and biochemical sensing applications. This review aims to highlight the recent research work on carbon allotrope-based OFS that will serve as a reference guide for researchers to develop optimal detection approaches for physical parameters or trace level monitoring of chemical and biomolecules. Four groups of carbon allotropes, including carbon nanotubes (CNT), carbon dots (CDs), graphene, and nanodiamonds (NDs), will be studied. Commonly adopted synthesis approaches, classification of various deposition techniques for the integration of carbon allotropes as the thin film coating of OFS as well as numerous examples of these carbon allotrope-based OFS will also be outlined.

show abstract

“…Until now, there has been no report on the direct CVD growth of graphene on optical sensors or optical fibers. Recently, Shivananju et al have demonstrated the direct CVD growth of carbon nanotubes (CNT) on optical fiber Bragg gratings for various sensing applications, and Jingyu et al have demonstrated the direct CVD growth of graphene on solid glass . The above two techniques can be used for the direct growth of graphene on optical devices for various applications, including biochemical sensing.…”

Section: Fabrication Of Graphene Optical Sensorsmentioning

confidence: 99%

“…The most important advantages in optical sensing are lowering the limit of detection (LOD) and increasing the specificity of label‐free sensing . Accordingly, optical sensors have been explored for various sensing applications in recent decades, such as chemicals, bio‐sensing, pH, humidity, gas, light, temperature and more, using various nanomaterials . The most striking features of graphene‐based optical biochemical sensors are ultra‐high sensitivity and ultrafast speed, thereby posing great potential to replace some of the current electrical and optical sensors used for biochemical sensing applications.…”

Section: Introductionmentioning

confidence: 99%

The Roadmap of Graphene‐Based Optical Biochemical Sensors

Shivananju

Liu

et al. 2016

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

Graphene is a novel two‐dimensional material composed of a one‐atom‐thick planar sheet of sp2‐bonded carbon atoms perfectly arranged in a honeycomb lattice that has exceptional photonic and electronic properties. We believe that the true potential of graphene lies in optical sensors, especially for biochemical sensing in the diagnostics and health care sector. Graphene has extraordinary properties, such as a one‐atom thickness, extremely high surface‐to‐volume ratio, large surface area, ability to quench fluorescence, excellent biocompatibility, broadband light absorption, ultrafast response time, high mechanical strength, outstanding robustness, and flexibility. The working principle is based on whenever the biomolecules come into contact with graphene, the Fermi level shifts to either p‐type or n‐type, changing the opto‐electronic properties. The most important factors in graphene‐based optical sensing are lowering the limit of detection and increasing the specificity of label‐free biochemical sensing. This article comprehensively and critically reviews emerging graphene optical biochemical sensors. We first elaborate on their opto‐electronic properties, fabrication, numerical modeling and simulation, and then review various sensing applications, such as single‐cell detection, neural imaging and optogenetics, colorimetric multifunctional sensors, cancer diagnosis, protein and DNA sensing, and gas sensing. Finally, the roadmap of current and future trends in graphene‐based optical biochemical sensors is discussed.

show abstract

Highly Sensitive Carbon Nanotubes Coated Etched Fiber Bragg Grating Sensor for Humidity Sensing

Cited by 50 publications

References 28 publications

Recent Developments in Fiber Optics Humidity Sensors

Recent Developments in Fiber Optics Humidity Sensors

Carbon Allotrope-Based Optical Fibers for Environmental and Biological Sensing: A Review

The Roadmap of Graphene‐Based Optical Biochemical Sensors

Contact Info

Product

Resources

About