Type

Journal Article

Authors

Gerald Farrell
Chongxiu Yu
Kuiru Wang
Binbin Yan
Xinzhu Sang
Tao Ma
Jinhui Yuan
Dejun Liu
Qiang wu
Yuliya Semenova
and 1 others

Subjects

Physics

Topics
optical fiber sensors sensitivity gas sensor gas detectors optical fiber couplers silicon compounds coatings high sensitivity

High Sensitivity Ammonia Gas Sensor Based on a Silica-Gel-Coated Microfiber Coupler (2017)

Abstract In this paper, a high-sensitivity ammonia gas sensor is proposed based on a silica-gel-coated microfiber coupler (MFC). The MFC structure is formed by the two tapered fibers with 3 μm waist diameter each, which were fabricated by using a customized microheater brushing technique. Silica gel coating was prepared by a sol-gel technique and applied on the surface of the MFC as a thin layer. The spectral characteristics of the proposed sensor were studied under various ammonia gas concentrations. The experimental results show that the coating thickness strongly affected the sensitivity of the MFC-based sensor to ammonia gas concentration. For the sensor with a 90 nm silica gel coating thickness, the highest measurement sensitivity is 2.23 nm/ppm for ammonia gas concentration, and the resolution is as good as 5 ppb, while the measured response and recovery times are ~50 and 35 s, respectively. Finally, it is demonstrated that the proposed sensor offers good repeatability and selectivity to ammonia gas.
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Full list of authors on original publication

Gerald Farrell, Chongxiu Yu, Kuiru Wang, Binbin Yan, Xinzhu Sang, Tao Ma, Jinhui Yuan, Dejun Liu, Qiang wu, Yuliya Semenova and 1 others

Experts in our system

1
Gerald Farrell
TU Dublin
Total Publications: 212
 
2
Chongxiu Yu
TU Dublin
Total Publications: 26
 
3
Kuiru Wang
TU Dublin
Total Publications: 7
 
4
Binbin Yan
TU Dublin
Total Publications: 9
 
5
Xinzhu Sang
TU Dublin
Total Publications: 14
 
6
Jinhui Yuan
TU Dublin
Total Publications: 24
 
7
Dejun Liu
TU Dublin
Total Publications: 24
 
8
Qiang wu
TU Dublin
Total Publications: 90
 
9
Yuliya Semenova
TU Dublin
Total Publications: 136