Miniaturized micro-machined catalytic gas sensors offer great advantages regarding power consumption
and response time. In combination with a porous catalyst layer high sensitivity can be achieved. However,
often this approach does not provide sufficient long-term stability. In this article a miniaturized catalytic
gas sensor for hydrogen detection is presented based on colloidally prepared and stabilized platinum
nanoparticles as a catalytic layer. Due to its miniaturized design and the highly porous catalyst, a very
short response time of