Type

Journal Article

Authors

Yuliya Semenova
Qiang wu
Vishnu Kavungal
Dejun Liu
Gerald Farrell
Arun Mallik

Subjects

Engineering

Topics
detection limit electrical and electronics air optical properties electrical and computer engineering silica gel coated spherical micro resonator ammonia gas concentration ultra high sensitivity detection

Silica Gel Coated Spherical Micro resonator for Ultra-High Sensitivity Detection of Ammonia Gas Concentration in Air (2018)

Abstract A silica gel coated microsphere resonator is proposed and experimentally demonstrated for measurements of ammonia (NH3) concentration in air with ultra-high sensitivity. The optical properties of the porous silica gel layer change when it is exposed to low (parts per million (ppm)) and even ultra-low (parts per billion (ppb)) concentrations of ammonia vapor, leading to a spectral shift of the WGM resonances in the transmission spectrum of the fiber taper. The experimentally demonstrated sensitivity of the proposed sensor to ammonia is estimated as 34.46 pm/ppm in the low ammonia concentrations range from 4 ppm to 30 ppm using an optical spectrum analyser (OSA), and as 800 pm/ppm in the ultra-low range of ammonia concentrations from 2.5 ppb to 12 ppb using the frequency detuning method, resulting in the lowest detection limit (by two orders of magnitude) reported to date equal to 0.16 ppb of ammonia in air. In addition, the sensor exhibits excellent selectivity to ammonia and very fast response and recovery times measured at 1.5 and 3.6 seconds, respectively. Other attractive features of the proposed sensor are its compact nature, simplicity of fabrication.
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Full list of authors on original publication

Yuliya Semenova, Qiang wu, Vishnu Kavungal, Dejun Liu, Gerald Farrell, Arun Mallik

Experts in our system

1
Yuliya Semenova
TU Dublin
Total Publications: 136
 
2
Qiang wu
TU Dublin
Total Publications: 90
 
3
Vishnu Kavungal
TU Dublin
Total Publications: 11
 
4
Dejun Liu
TU Dublin
Total Publications: 24
 
5
Gerald Farrell
TU Dublin
Total Publications: 212
 
6
Arun Mallik
TU Dublin
Total Publications: 26