This review summarizes the different tools and concepts that are commonly applied in air
quality monitoring. The monitoring of atmosphere is extremely important as the air quality is …

Recent developments in portable and handheld opto-chemical analytical instrumentation
over the last decade (2000–2010) are reviewed. First, the characteristics of typical …

Microbial spoilage of food is accompanied by a pronounced production of carbon dioxide
(CO 2). Sensors that visually highlight the presence of CO 2 inside the food packages can …

In this work we present a full-passive flexible multigas sensing tag for the determination of
oxygen, carbon dioxide, ammonia, and relative humidity readable by a smartphone. This tag …

We investigated the UV-Vis absorption, singlet-1 and singlet-2 fluorescence, as well as the
formation of several metalloporphyrins from equilibrial and kinetic aspects in aqueous …

New indicators for optical CO2 sensors are synthesized in two steps from the commercially
available diketo-pyrrolo-pyrrole (DPP) pigments Irgazin Ruby and Irgazin Scarlet. After …

In this work, a radiofrequency identification (RFID) tag with an optical indicator for the
measurement of gaseous oxygen is described. It consists of an O2 sensing membrane of …

A portable sensor has been developed for in situ measurements of pH within aqueous
environments. The sensor design incorporates microfluidic technology, allowing for the use …

The synthesis and photophysical properties of a series of yellow-green to blue-green
emitting heteroleptic, cyclometalated Pt (II)(acac) complexes based on substituted …

A new system for CO 2 measurement (0–100%) based on a paired emitter–detector diode
arrangement as a colorimetric detection system is described. Two different configurations …