[1] Wanna Y, Srisukhumbowornchai N, Tuantranont A et al. The effect of carbon nanotube dispersion on CO gas sensing characteristics of polyaniline gas sensor[J]. Journal of Nanoscience and Nanotechnology, 6, 3893-3896(2006). http://www.ncbi.nlm.nih.gov/pubmed/17256348

[2] Russell P S J. Photonic-crystal fibers[J]. Journal of Lightwave Technology, 24, 4729-4749(2006).

[3] Choi H Y, Park K S, Park S J et al. Miniature fiber-optic high temperature sensor based on a hybrid structured Fabry-Perot interferometer[J]. Optics Letters, 33, 2455-2457(2008). http://www.europepmc.org/abstract/MED/18978885

[4] Duan D W, Zhu T, Rao Y J et al. A miniature extrinsic Fabry-Perot interferometer strain sensor based on hollow-core photonic cryatal fiber[J]. Acta Optica Sinica, 28, 17-20(2008).

[5] Wong W C, Chan C C, Chen L H et al. Highly sensitive miniature photonic crystal fiber refractive index sensor based on mode field excitation[J]. Optics Letters, 36, 1731-1733(2011). http://www.ncbi.nlm.nih.gov/pubmed/21540984

[6] Mathew J, Semenova Y, Farrell G. Effect of coating thickness on the sensitivity of a humidity sensor based on an Agarose coated photonic crystal fiber interferometer[J]. Optics Express, 21, 6313-6320(2013). http://www.opticsinfobase.org/abstract.cfm?uri=oe-21-5-6313

[7] Ji Y S, Fu G W, Fu X H et al. Sensing characteristics of Mach-Zehnder interferometer based on the fused tapered photonic crystal fiber sensor[J]. Acta Optica Sinica, 33, 1006005(2013).

[8] Fu X H, Xie H Y, Zhu H B et al. Experimental research of curvature sensor based on tapered photonic crystal fiber Mach-Zehnder interferometer[J]. Acta Optica Sinica, 35, 0506002(2015).

[9] Feng X, Feng W L, Tao C Y et al. Hydrogen sulfide gas sensor based on graphene-coated tapered photonic crystal fiber interferometer[J]. Sensors and Actuators B: Chemical, 247, 540-545(2017). http://www.sciencedirect.com/science/article/pii/S0925400517304872

[10] Feng X, Yang X Z, Huang G J et al. Hydrogen sulfide gas sensor based on Cu ion-deposited graphene-coated tapered photonic crystal fiber[J]. Acta Photonica Sinica, 46, 0923002(2017).

[11] Villatoro J, Finazzi V, Minkovich V P et al. Temperature-insensitive photonic crystal fiber interferometer for absolute strain sensing[J]. Applied Physics Letters, 91, 091109(2007). http://scitation.aip.org/content/aip/journal/apl/91/9/10.1063/1.2775326

[12] Niu L, Zhao C L, Gong H P et al. Curvature sensor based on two cascading abrupt-tapers modal interferometer in single mode fiber[J]. Optics Communications, 333, 11-15(2014). http://www.sciencedirect.com/science/article/pii/S0030401814006543

[13] Jha R, Villatoro J, Badenes G et al. Refractometry based on a photonic crystal fiber interferometer[J]. Optics Letters, 34, 617-619(2009). http://europepmc.org/abstract/med/19252570

[14] Yablon A D, Bise R T. Low-loss high-strength microstructured fiber fusion splices using GRIN fiber lenses[J]. IEEE Photonics Technology Letters, 17, 118-120(2005).

[15] Xiao L M, Demokan M S, Jin W et al. Fusion splicing photonic crystal fibers and conventional single-mode fibers: microhole collapse effect[J]. Journal of Lightwave Technology, 25, 3563-3574(2007). http://www.opticsinfobase.org/abstract.cfm?uri=jlt-25-11-3563

[16] Barrera D, Villatoro J, Finazzi P et al. Low-loss photonic crystal fiber interferometers for sensor networks[J]. Journal of Lightwave Technology, 28, 3542-3547(2010). http://www.opticsinfobase.org/JLT/abstract.cfm?uri=JLT-28-24-3542

[17] Golczak S, Kanciurzewska A, Fahlman M et al. Comparative XPS surface study of polyaniline thin films[J]. Solid State Ionics, 179, 2234-2239(2008). http://www.sciencedirect.com/science/article/pii/S0167273808005675