... 2008
Keywords:
Trace ammonia
Optical sensor
Dual lifetime referencing (DLR)
abstract
Dual lifetime referencing is applied to trace ammonia sensors. Two schemes are presented to achieve
luminescence lifetime ... Sensors and Actuators B 139 (2009) 132–138
Contents lists available at ScienceDirect
Sensors and Actuators B: Chemical
journal homepage: www.elsevier.com/locate/...
... techniques.
4.1. Metal-oxide gas sensors
The ammonia sensors that have been manufactured in the
largest quantities are without doubt metal-oxide gas sensors,
mostly based on SnO
2
sensors [7]. A lot of ... optimising
the ammonia sensitivity of SnO
2
based ammonia sensors are
Pd, Bi and AlSiO
3
[64] or Pt and SiO
2
[65].
The lowest ammonia detection limit found in literature...