Correction to: A review on nanomaterial-modified optical fiber sensors for gases, vapors and ions

Correction to: Microchimica Acta

https://doi.org/10.1007/s00604-019-3351-7

The published version of this article, unfortunately, contains error. Corrections in Figs. 1, 3 and 5 were incorrectly carried out. Given in this article are the correct figures.

Fig. 1

a Experimental set up of an Fe₃O_4-graphene FPI for NH₃ sensing (sensing material is coated at the end of the fiber tip). b Dip wavelength shift of graphene coated FPI and Fe₃O_4-graphene coated FPI with NH₃ concentration ranging from 1.5-150 ppm. c. Time response curve of graphene coated FPI and Fe₃O_4-graphene coated FPI with NH₃ concentration from 1.5-150 ppm. d Cross-sensitivity study of graphene coated FPI and Fe₃O_4-graphene coated FPI at 150 ppm NH₃ gas. e FESEM image of nano-carbon. f Spectral response of nano-carbon coated FPI with NH₃ sensing concentration ranging from 3-3000 ppm. g Response function characteristics of nano-carbon FPI in terms of wavelength shift with NH₃ concentration from 3-3000 ppm at 60 secs, 120 secs, and 180 secs respectively. h Time response curve of nanocarbon FPI at different ppm levels for nano-carbon. Reprinted with permission from [103, 116]. Copyright of Royal Society of Chemistry

Fig. 3

a Coating process of PAA-CNTs/PAH nanofilms and cryptophane -A-6Me layer on to the inner surface of PCF cladding air holes. b Simulation model of PCF-LPG with sensing film coated on to the cladding air holes and its cladding mode LP₁₁ in plane A and plane E. c Dip wavelength shift with respect to change in CH₄ concentration from 0%-3.5%. d Sensor time response graph for 210 nm thickness film for exposure of 1.5% CH₄ concentration. Reprint with permission from Ref. [176]. Copyright of The Optical Society

Fig. 5

a Sketch of rGO coated side polished optical fiber sensing probe with its cross section and its SEM images. b Optical power variation of rGO coated side polished optical fiber sensor with varied toluene concentration from 40 to 196 ppm. c Optical power variation of rGO coated side polished optical fiber sensor as a function of time with toluene concentration of 196 ppm. d Schematic diagram of the process for the fabrication of the U-bent SPR sensor. e Response of SPR spectrum of coated graphene/AgNPs U-bent sensor with different concentrations of aqueous ethanol. f Shift of the SPR sensor coated with graphene/AgNPs and PVA/AgNPs with different concentrations of aqueous ethanol. g Time response curve of graphene/AgNPs SPR sensor for aqueous ethanol concentration of 50%. Reprinted with permission from Ref. [85, 190]. Copyright of The Optical Society and Elsevier

The original article has been corrected.