The present invention provides for novel hydrogen sensors and methods for
making same. In some embodiments, such novel hydrogen sensors are
continuous-range hydrogen sensors comprising Pd--Ag nanoparticles arrayed
as nanowires or two-dimensional shapes on a resistive surface. Such
continuous-range hydrogen sensors are capable of measuring a wide range
of hydrogen gas concentration over a wide temperature range. Unlike
existing hydrogen sensors that experience a large change in resistance at
a certain hydrogen concentration, the continuous-range hydrogen sensor of
the present invention changes resistance continuously over a broad range
of hydrogen concentration. This continuous change varies slowly with
hydrogen concentration and is predictable such that the continuous-range
hydrogen sensor can be used to measure hydrogen concentration
continuously from a few ppm to 40,000 ppm level or higher over a broad
range of temperatures (e.g., -40.degree. C. to +150.degree. C.).