Graphene-coated microfiber Bragg grating for high-sensitivity gas sensing

Wu, Yu; Yao, Baicheng; Zhang, Anqi; Rao, Yunjiang; Wang, Zegao; Yang, Cheng; Gong, Yuan; Zhang, Weili; Chen, Yuanfu; Chiang, Kin Seng

doi:10.1364/ol.39.001235

Cited by 181 publications

(84 citation statements)

References 16 publications

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“…Deposition of graphene and its derivatives on fiber surface could enhance the performance of optical fiber devices (Wu et al, 2014;Sridevi et al, 2016). However, the lack of efficient transfer techniques limited the usage of graphene and GO for fiber device with cylindrical shape and small diameter.…”

Section: Functionalization Of Go-dlpg Sensormentioning

confidence: 99%

Graphene oxide functionalized long period grating for ultrasensitive label-free immunosensing

Liu

Cai

et al. 2017

Biosensors and Bioelectronics

112

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We explore graphene oxide (GO) nanosheets functionalized dual-peak long period grating (dLPG) based biosensor for ultrasensitive label-free antibody-antigen immunosensing. The GO linking layer provides a remarkable analytical platform for bioaffinity binding interface due to its favorable combination of exceptionally high surface-to-volume ratio and excellent optical and biochemical properties. A new GO deposition technique based on chemical-bonding in conjunction with physical-adsorption was proposed to offer the advantages of a strong bonding between GO and fiber device surface and a homogeneous GO overlay with desirable stability, repeatability and durability. The surface morphology of GO overlay was characterized by Atomic force microscopy, Scanning electron microscope, and Raman spectroscopy. By depositing the GO with a thickness of 49.2 nm, the sensitivity in refractive index (RI) of dLPG was increased to 2538 nm/RIU, 200% that of non-coated dLPG, in low RI region (1.333-1.347) where bioassays and biological events were usually carried out. The IgG was covalently immobilized on GO-dLPG via EDC/NHS heterobifunctional cross-linking chemistry leaving the binding sites free for target analyte recognition. The performance of immunosensing was evaluated by monitoring the kinetic bioaffinity binding between IgG and specific anti-IgG in real-time. The GO-dLPG based biosensor demonstrates an ultrahigh sensitivity with limit of detection of 7 ng/mL, which is 10-fold better than non-coated dLPG biosensor and 100-fold greater than LPG-based immunosensor. Moreover, the reusability of GO-dLPG biosensor has been facilitated by a simple regeneration procedure based on stripping off bound anti-IgG treatment. The proposed ultrasensitive biosensor can be further adapted as biophotonic platform opening up the potential for food safety, environmental monitoring, clinical diagnostics and medical applications.

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Section: Functionalization Of Go-dlpg Sensormentioning

confidence: 99%

Graphene oxide functionalized long period grating for ultrasensitive label-free immunosensing

Liu

Cai

et al. 2017

Biosensors and Bioelectronics

112

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“…Meanwhile, it has been shown that the graphene layer can be tightly coated onto a nanowire due to van der Waals forces [16][17][18]. Sketched in Fig.…”

Section: The Plasmons Resonator Based On Graphene-coated Insb Nanowirementioning

confidence: 99%

Magnetically tunable non-reciprocal plasmons resonator based on graphene-coated nanowire

Zhu¹,

Cryan²,

Gao³

et al. 2015

Opt. Mater. Express

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Abstract:In this paper we propose a magnetically tunable plasmons resonator based on a graphene-coated nanowire. Due to the magneto-optical effect under an external magnetic field, the circumferential propagation of graphene plasmons on a magneto-optical nanowire becomes non-reciprocal with the modal indices depend on plasmons traveling directions (clockwise or anti-clockwise). When coupled with a graphene sheet waveguide, the two components form a graphene plasmons filter for which the shift direction of transmittance spectrum is determined by the direction of input plasmons. The resonant wavelengths of resonator are obtained through resonant cavity theory and verified by numerical solutions. Furthermore, the non-reciprocal transmittance enables such structures to achieve the function of a plasmons isolator where the isolation could be tuned by the amplitude of an external magnetic field and the enabled plasmons propagation direction could be switched by reversing the direction of external magnetic field. Under proper structural parameters and magnetic field, an isolation ratio over 25 dB is obtained. The proposed magnetically tunable plasmons resonator may provide new inspiration to graphene plasmonics devices. 2015 Optical Society of America

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“…Thus alternative approaches for enhancing SRI sensitivity constantly pursued. As such, coating of graphene (oxide) or carbon nanotubes (CNTs) on the etched FBG surface to redistribute the evanescent field were used for gas or bio-sensing with high sensitivity [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Refractometer probe based on a reflective carbon nanotube-modified microfiber Bragg grating

et al. 2016

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A carbon nanotube (CNT)-modified microfiber Bragg grating (MFBG) is proposed to measure the refractive index with strong enhancement of the sensitivity in low refractive index region. The introduction of the CNT layer influences evanescent field of the MFBG and causes modification of the reflection spectrum. With the increase of the surrounding refractive index (SRI), we observe significant attenuation to the peak of the Bragg resonance while its wavelength almost remains unchanged. Our detailed experimental results disclose that the CNT-MFBG demonstrates strong sensitivity in the low refractive index range of 1.333~1.435, with a peak intensity up to -53.4 dBm/RIU, which is 15-fold higher than that of the uncoated MFBG. Therefore, taking advantage of the CNT-induced evanescent field enhancement, the reflective MFBG probe presents strong sensing capability in biochemical fields.

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Graphene-coated microfiber Bragg grating for high-sensitivity gas sensing

Cited by 181 publications

References 16 publications

Graphene oxide functionalized long period grating for ultrasensitive label-free immunosensing

Graphene oxide functionalized long period grating for ultrasensitive label-free immunosensing

Magnetically tunable non-reciprocal plasmons resonator based on graphene-coated nanowire

Refractometer probe based on a reflective carbon nanotube-modified microfiber Bragg grating

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