Highly sensitive optical fiber oxygen sensor based on dye entrapped core-shell silica nanoparticles

2011 ◽  
Author(s):  
Chen-Shane Chu ◽  
Yu-Lung Lo ◽  
Ti-Wen Sung
Keyword(s):  
Optical Fiber ◽  
Silica Nanoparticles ◽  
Oxygen Sensor ◽  
Core Shell ◽  
Highly Sensitive

Novel optical oxygen sensing by phosphorescence quenching of palladium porphyrin self-assembled film on alumina plate

2000 ◽  
Vol 04 (02) ◽  
pp. 179-184 ◽  
Author(s):  
YUTAKA AMAO ◽  
KEISUKE ASAI ◽  
ICHIRO OKURA
Keyword(s):  
Oxygen Pressure ◽  
Oxygen Sensor ◽  
Response Times ◽  
Oxygen Sensing ◽  
Fast Response ◽  
Phosphorescence Quenching ◽  
Highly Sensitive ◽  
Optical Oxygen Sensor ◽  
Self Assembled ◽  
Quenching By Oxygen

An optical oxygen sensor based on the phosphorescence quenching of palladium tetrakis(4-carboxyphenyl)porphyrin (PdTCPP) self-assembled film (SAM) on alumina plate was developed. The phosphorescence intensity of PdTCPP film decreased with increasing oxygen pressure, indicating that the film can be used as an optical oxygen-sensing device based on phosphorescence quenching by oxygen. The ratio I0/I100 as a sensitivity measure of the sensing film is estimated to be 17.7, showing that the film is a highly sensitive device for oxygen pressure. The film obeyed Stern–Volmer plots with a multisite model and possessed good operational stability and a fast response. Response times are 36 s for deoxygenated to oxygenated conditions and 148 s for the reverse conditions.

Novel core–shell (TiO2@Silica) nanoparticles for scattering medium in a random laser: higher efficiency, lower laser threshold and lower photodegradation

Nanoscale ◽  
2013 ◽  
Vol 5 (24) ◽  
pp. 12512 ◽  
Author(s):  
Ernesto Jimenez-Villar ◽  
Valdeci Mestre ◽  
Paulo C. de Oliveira ◽  
Gilberto F. de Sá
Keyword(s):  
Silica Nanoparticles ◽  
Core Shell ◽  
Random Laser ◽  
Scattering Medium ◽  
Laser Threshold
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