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A Near-Infrared Plasmonic Sensor Based on Wedge Fiber-Optic for Ultra-Sensitive Hg Detection

The growing number of serious diseases caused by ever-increasing heavy metal ions pollution have necessitated the use of ion sensors in healthcare and environment monitoring systems. Even with low concentrations heavy metal ions can cause significant harm, so ultra-sensitive on-site and label-free monitoring of heavy metal ions is of great importance. In this work, a simple, portable and high sensitivity optical fiber surface plasmon resonance (SPR) sensor is demonstrated for the detection of Hg 2+ . On the basis of the investigation of the effects of different incident angles, the optical fiber sensor adopts wedged tip probe with a 75° incident angle. The plasmonic sensor exhibits a superior refractive index bulk sensitivity of up to 13830 nm/RIU in near-infrared band, which is a further step in ultrasensitive sensing detection, compared with the traditional optical fiber SPR sensors. In addition, we validate the optical fiber sensor's performance for Hg 2+ sensing. By self-assembling monolayer of 1,6-Hexanedithiol (HDT) on the sensing surface, the Au-coated fiber-optic probe is modified to capture Hg 2+ . The lowest detection limit is found to be 0.324 ug/mL for the near-infrared band and the sensitivity can reach up to 0.22 nm/ (ug/mL) . The experimental results show the excellent promise for our sensor in applications of environmental monitoring due to high sensitivity, selectivity and low-cost.

Ketersediaan

Informasi Detail

Judul Seri

JOURNAL OF LIGHTWAVE TECHNOLOGY; Vol.40 No.24 December 15, 2022

No. Panggil

-

Penerbit

: .,

Deskripsi Fisik

p. 7946-7951

Bahasa

English

ISBN/ISSN

-

Klasifikasi

NONE

Tipe Isi

-

Tipe Media

-

Tipe Pembawa

-

Edisi

-

Subjek

SURFACE PLASMON RESONANCE
OPTICAL FIBER SENSOR
1 , 6 -HEXANEDITHIOL
HG 2+ DETECTION

Info Detail Spesifik

DOI: 10.1109/JLT.2022.3205607

Pernyataan Tanggungjawab

Lixia Li, Linlin Zhao, Xueyang Zong, Penglei Li, Kun Yu, Yufang Liu

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