MoS2-based all-fiber humidity sensor for monitoring human breath with fast response and recovery

Abstract A humidity sensor is demonstrated using a MoS 2 -coated etched single-mode fiber (ESMF) and applied in human breath monitoring. Because of the interaction between MoS 2 nanosheets and the evanescent field of an ESMF, the light confined within fiber core could be tuned by ambient conditions. The optical frequency conductivity of MoS 2 changes with relative humidity variation, so does the transmission light power of the ESMF. A 14 fold enhancement of light power variation in response to human breaths is achieved compared with a bare ESMF. Fast response and recovery speed (0.066 s response and 2.395 s recovery time) enable this sensor to detect human breath in real time. The results also show the feasibility in monitoring different breath patterns related to the breath frequency and depth.

[1]  Bo Yang,et al.  Triaxial MRI-Compatible Fiber-optic Force Sensor , 2011, IEEE Transactions on Robotics.

[2]  Madan Dubey,et al.  Two-dimensional material nanophotonics , 2014, 1410.3882.

[3]  Youwei Du,et al.  Enhancement of magnetism by structural phase transition in MoS2 , 2015 .

[4]  R. Saatchi,et al.  Respiration rate monitoring methods: A review , 2011, Pediatric pulmonology.

[5]  F. Yasuma,et al.  Respiratory sinus arrhythmia: why does the heartbeat synchronize with respiratory rhythm? , 2004, Chest.

[6]  Filip Braet,et al.  Carbon nanomaterials in biosensors: should you use nanotubes or graphene? , 2010, Angewandte Chemie.

[7]  Jianlin Zhao,et al.  Erbium-doped fiber laser passively mode locked with few-layer WSe2/MoSe2 nanosheets , 2016, Scientific Reports.

[8]  Jr-Hau He,et al.  Few-Layer MoS2 with high broadband Photogain and fast optical switching for use in harsh environments. , 2013, ACS nano.

[9]  D. Late,et al.  Temperature dependent Raman spectroscopy of chemically derived few layer MoS2 and WS2 nanosheets , 2014 .

[10]  Zhi-mei Qi,et al.  Humidity sensor based on power leakage at resonance wavelengths of a hollow core fiber coated with reduced graphene oxide , 2016 .

[11]  J. Shan,et al.  Atomically thin MoS₂: a new direct-gap semiconductor. , 2010, Physical review letters.

[12]  Jun Zhang,et al.  Tungsten disulfide (WS2) based all-fiber-optic humidity sensor. , 2016, Optics express.

[13]  H. Zeng,et al.  Nonlinear Saturable Absorption of Liquid-Exfoliated Molybdenum/Tungsten Ditelluride Nanosheets. , 2016, Small.

[14]  Xiaodong He,et al.  MoS2 graphene fiber based gas sensing devices , 2015 .

[15]  Emiliano Schena,et al.  Optical Fiber-Based MR-Compatible Sensors for Medical Applications: An Overview , 2013, Sensors.

[16]  Lifeng Chi,et al.  High Performance Field‐Effect Ammonia Sensors Based on a Structured Ultrathin Organic Semiconductor Film , 2013, Advanced materials.

[17]  Jun Zhang,et al.  Reduced graphene oxide for fiber-optic humidity sensing. , 2014, Optics express.

[18]  Joonsuk Park,et al.  Molybdenum disulfide catalyzed tungsten oxide for on-chip acetone sensing , 2016 .

[19]  Hyun-Ho Yang,et al.  A simple breathing rate-sensing method exploiting a temporarily condensed water layer formed on an oxidized surface , 2015 .

[20]  Hua Zhang,et al.  The chemistry of two-dimensional layered transition metal dichalcogenide nanosheets. , 2013, Nature chemistry.

[21]  Luca Ottaviano,et al.  Response to NO2 and other gases of resistive chemically exfoliated MoS2-based gas sensors , 2015 .

[22]  F. Arregui,et al.  Optical fiber humidity sensor based on a tapered fiber coated with agarose gel , 2000 .

[23]  Limin Tong,et al.  Fiber optic relative humidity sensor based on the tilted fiber Bragg grating coated with graphene oxide , 2016 .

[24]  Dermot Diamond,et al.  Inherently conducting polymer modified polyurethane smart foam for pressure sensing , 2005 .

[25]  D. Gao,et al.  High temperature ferromagnetism in Cu-doped MoS2 nanosheets , 2016 .