Zinc oxide coated optical fiber long period gratings for sensing of volatile organic compounds

• Type: Article in International Conference Proceedings Book
• Date: 2016

Authors

Coelho, L (Author) FCUP; Viegas, D (Author) FCUP; Santos, JL (Author) FCUP; de Almeida, JMMM (Author) FCUP

Conference proceedings International

Title: OPTICAL SENSING AND DETECTION IV

Conference on Optical Sensing and Detection IV

Brussels, BELGIUM, APR 03-07, 2016

Indexing

ISI Web of Knowledge - 3 Citations

Scopus - 8 Citations

Other information

Authenticus ID: P-00M-88T

DOI: 10.1117/12.2219630

Abstract (EN): The detection of volatile organic compounds is accomplished with a sensing device based on a long period fiber grating (LPFG) coated with a zinc oxide (ZnO) thin layer with self-temperature compensation. The ZnO coating structure was produced onto the cladding of the fiber by thermal oxidation of a metallic Zn thin film. The morphological characterization of ZnO thin films, grown at the same time on silicon substrates, was performed using X-ray diffraction, X-ray Photoelectron Spectroscopy and Scanning Electron Microscope which shows very good agreement. LPFGs with 290 nm thick ZnO coating were fabricated and characterized for the detection of ethanol and hexane in vapor phase. For ethanol a sensitivity of 0.99 nm / g.m(-3) was achieved when using the wavelength shift interrogation mode, while for hexane a much lower sensitivity of 0.003 nm / g.m(-3) was measured, indicating a semi-selectivity of the sensor with a spectral resolution better than 3.2 g.m(-3).

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11