Novel SnO₂ based optical sensor for detectin of low ammonia concentration in water at room temperatures

• Published in: Semiconductor Physics Quantum Electronics & Optoelectronics
• Date: 2005
• Main Authors: Pisco, M., Consales, M., Viter, R., Smyntyna, V., Campopiano, S., Giordano, M., Cusano, A., Cutolo, A.
• Format: Article
• Language: English
• Published: Інститут фізики напівпровідників імені В.Є. Лашкарьова НАН України 2005
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/120646
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Novel SnO₂ based optical sensor for detectin of low ammonia concentration in water at room temperatures / M. Pisco, M. Consales, R. Viter, V. Smyntyna, S. Campopiano, M. Giordano, A. Cusano, A. Cutolo // Semiconductor Physics Quantum Electronics & Optoelectronics. — 2005. — Т. 8, № 1. — С. 95-99. — Бібліогр.: 6 назв. — англ.

In the work, presented are preliminary experimental results on the capability of a metal oxide (MO) based optical sensor to perform ammonia detection in water environment at room temperature. The electro-spray pyrolysis technique was used to deposit SnO₂ films on the distant end of standard silica optical fiber (SOF). Reflection spectra of the studied samples were preliminarily characterized in the range of 1520 to 1620 nm by using a tunable laser and an optical spectrum analyzer. Single wavelength reflectance measurements were carried out to test the sensing performances for detecting the ammonia of concentration from 4 to 20 ppm. High sensitivity to the target analyte and fast response times were observed. From the results obtained, the detection limit close to a sub-ppm level was achieved.