Preparation of Graphene/ITO Nanorod Metamaterial/U-Bent-Annealing Fiber Sensor and DNA Biomolecule Detection.

Wen Yang,Xiangtai Xi,Shouzhen Jiang,Chao Zhang,Weiwei Yue,Yang Sun,Jing Yu,Yiming Shen

doi:10.3390/nano9081154

Wen Yang, Xiangtai Xi + Show 6 more

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https://doi.org/10.3390/nano9081154

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Journal: Nanomaterials	Publication Date: Aug 12, 2019
Citations: 22	License type: CC BY 4.0

Affiliation: Shandong Normal University

Abstract

In this paper, a graphene/ITO nanorod metamaterial/U-bent-annealing (Gr/ITO-NM/U-bent-A)-based U-bent optical fiber local surface plasmon resonance (LSPR) sensor is presented and demonstrated for DNA detection. The proposed sensor, compared with other conventional sensors, exhibits higher sensitivity, lower cost, as well as better biological affinity and oxidize resistance. Besides, it has a structure of an original Indium Tin Oxides (ITO) nanocolumn array coated with graphene, allowing the sensor to exert significant bulk plasmon resonance effect. Moreover, for its discontinuous structure, a larger specific surface area is created to accommodate more biomolecules, thus maximizing the biological properties. The fabricated sensors exhibit great performance (690.7 nm/RIU) in alcohol solution testing. Furthermore, it also exhibits an excellent linear response (R2 = 0.998) to the target DNA with respective concentrations from 0.1 to 100 nM suggesting the promising medical applications of such sensors.

Highlights

In recent years, local surface plasmon resonance (LSPR) sensors have attached much attention in environmental pollution, food safety, drug testing, and military [1,2,3,4,5] due to their excellent electrical and optical characteristics [6,7]
Numerous fiber structures have been studied to enhance the performance of the LSPR sensor
Various materials have been widely used as the sensing surface of the U-bent LSPR sensor, exhibiting great performance in the detection of water, gas, and even DNA molecules [15,16,17,18]

Summary

Introduction

Local surface plasmon resonance (LSPR) sensors have attached much attention in environmental pollution, food safety, drug testing, and military [1,2,3,4,5] due to their excellent electrical and optical characteristics [6,7]. Numerous fiber structures have been studied to enhance the performance of the LSPR sensor (e.g., tapered fiber structures [8,9], partially uncoated fiber [10], side polished fiber [11], grating fiber structures [12], D-shaped fiber structures [13], as well as U-bent structures [14]). U-bent structures are considered one of the most promising LSPR sensors due to advantages including excellent evanescent field (big index difference) and simple detection (small tip volume).

Results

Conclusion