H2 Sensors

The H2 signal transduction cascade involves an H2 sensor (HupUV), the regulatory soluble [NiFe] hydrogenase and a two-component regulatory system (HupT/HupR). 

The H2 sensor of R. eutropha belongs to a distinct subclass of [NiFe] hydrogenases... 

Kleihues L, Lenz O. Bernhard M, et al. 2000. The H2 sensor of Ralstonia eutropha is a member of the subclass of regulatory (NiFe) hydrogenases. J Bacteriol 182 2716-24. 

This work is divided into four main sections. First, in Part II, we discuss the influence of adsorbate effects on the conductivity of a-Si H material. In Part III the possibility of using a-Si H for thermistor applications is considered and justified. Part IV covers in some detail the studies of a-Si H-based MIS structures for hydrogen detection, while Parr. V deals with ACS devices based on a-Si H FETs. We will consider the specific example of a Pd MOSFET H2 sensor. 

In this section we will deal with the basic principles of H2 sensors based on the combination of a catalytic metal (Pd, for instance) with an a-Si H thin film. As for the sensitivity of these devices, we will explore the variation of... 

The studies made on the Pd MIS structure have demonstrated that H2 sensors can be reliable devices, with high sensitivity and fast response. On the basis of the investigated structures and results, it has been established that the main mechanism responsible for the sensitivity is the change in contact potential. Once the a-Si H film is in some way protected from contaminating gases or liquids, MIS H2 sensor performances are mainly determined, controlled, and limited by the quality, poisoning, and stability of the Pd film or of any suitable catalytic material used. 

The development of H2-based and syngas-based energy systems require multifaceted studies on hydrogen sources, hydrogen production, hydrogen separation, hydrogen storage, H2 utilization and fuel cells, H2 sensor, and safety aspects, as well... 

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