TY - JOUR
T1 - Volatile organic compounds optical fiber sensor based on lossy mode resonances
AU - Elosua, Cesar
AU - Arregui, F. J.
AU - Zamarreño, C. R.
AU - Bariain, Candido
AU - Luquin, Asuncion
AU - Laguna, Mariano
AU - Matias, Ignacio R.
PY - 2012/10
Y1 - 2012/10
N2 - An optical fiber sensor to monitor volatile organic compounds (VOCs) has been developed. The sensing material used is the organometallic [Au 2Ag 2(C 6F 5) 4(NH 3) 2] n: its optical properties show reversible changes in presence of organic vapors. The main idea consists of using the sensing features of this material to prepare a sensor based on wavelength modulation: specifically, it meets the conditions required to induce lossy mode resonances (LMRs). The sensor works in transmission configuration, depositing the sensing compound along a segment of a plastic cladding silica (PCS) fiber where the cladding was previously removed. The method followed to deposit the sensing coating is the Layer by Layer (LbL), which allows the LMR spectral location to be tuned by means of controlling the sensing coating thickness. A spectral shift to blue is observed when the device is in presence of different organic solvents: actually, it shows a linear relation between the LMR spectral shift and the vapor concentration with a sensitivity of 0.131 nm ppm -1 from 0 to 250 ppm (v/v) of methanol. In this range, the total spectral shift is around 30 nm. The cross sensitivity to relative humidity is very low (a maximum shift of 1 nm from 40 to 60% R.H.) and negligible in the case of temperature between 20 °C and 60 °C.
AB - An optical fiber sensor to monitor volatile organic compounds (VOCs) has been developed. The sensing material used is the organometallic [Au 2Ag 2(C 6F 5) 4(NH 3) 2] n: its optical properties show reversible changes in presence of organic vapors. The main idea consists of using the sensing features of this material to prepare a sensor based on wavelength modulation: specifically, it meets the conditions required to induce lossy mode resonances (LMRs). The sensor works in transmission configuration, depositing the sensing compound along a segment of a plastic cladding silica (PCS) fiber where the cladding was previously removed. The method followed to deposit the sensing coating is the Layer by Layer (LbL), which allows the LMR spectral location to be tuned by means of controlling the sensing coating thickness. A spectral shift to blue is observed when the device is in presence of different organic solvents: actually, it shows a linear relation between the LMR spectral shift and the vapor concentration with a sensitivity of 0.131 nm ppm -1 from 0 to 250 ppm (v/v) of methanol. In this range, the total spectral shift is around 30 nm. The cross sensitivity to relative humidity is very low (a maximum shift of 1 nm from 40 to 60% R.H.) and negligible in the case of temperature between 20 °C and 60 °C.
KW - Layer by Layer
KW - Lossy mode resonances
KW - Optical fiber sensor
KW - Organometallic material
KW - Self referenced measurement
UR - https://www.scopus.com/pages/publications/84867036151
U2 - 10.1016/j.snb.2012.07.048
DO - 10.1016/j.snb.2012.07.048
M3 - Article
AN - SCOPUS:84867036151
SN - 0925-4005
VL - 173
SP - 523
EP - 529
JO - Sensors and Actuators B: Chemical
JF - Sensors and Actuators B: Chemical
ER -