Chemical gas sensors are used in a large variety of applications spanning from security and industrial safety to consumer products. Binary n-type semiconductor oxides such as tin oxide (SnO2), indium oxide (In2O3) or zinc oxide (ZnO) have been extensively investigated as gas-sensing materials since the 1950’s. These metal oxide sensors detect small amounts of a gaseous species present in air from a change in electrical resistance. Titanium dioxide (TiO2) in particular is ideal for environmental monitoring, as its sensor response is insensitive to ambient humidity in contrast to SnO2.
TiO2 nanoparticles were made by flame spray pyrolysis and the gas-sensing properties were tested by DC electrical measurements. A high sensitivity of the flame made TiO2 nanoparticles towards low concentrations of volatile organic compounds was shown. For example, the sensor resistance decreases under pulses of isoprene at low concentrations in a dry N2/O2 atmosphere. This behavior is typical for anatase titania as an n-type semiconductor. The response time was within a few seconds during the backward and forward cycle. The high stability and sensitivity of flame-made TiO2 nanoparticles demonstrated show the high potential for their use as gas sensing material.
Diese Website wird in älteren Versionen von Netscape ohne graphische Elemente dargestellt. Die Funktionalität der Website ist aber trotzdem gewährleistet. Wenn Sie diese Website regelmässig benutzen, empfehlen wir Ihnen, auf Ihrem Computer einen aktuellen Browser zu installieren. Weitere Informationen finden Sie auf
The content in this site is accessible to any browser or Internet device, however, some graphics will display correctly only in the newer versions of Netscape. To get the most out of our site we suggest you upgrade to a newer browser.