کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1278596 | 1497560 | 2012 | 6 صفحه PDF | دانلود رایگان |
We have investigated a lithography-free technique for On-Off type hydrogen sensors using a cracked palladium (Pd) film on an elastomeric substrate. Cracks were induced in a sputtered Pd film simply by undergoing hydrogen absorption and desorption processes. Compared to the same thickness of a Pd film on a Si/SiO2 substrate that relied on the electron scattering mechanism, a cracked Pd film on an elastomeric substrate operated as a reversible On-Off hydrogen sensor based on the crack open-close mechanism when exposed to hydrogen. The thickness of a Pd film on the elastomeric substrate plays a significant role in determining the sensing mode of the cracked Pd film. The cracked Pd film with a thickness of 9–11 nm on the elastomeric substrate showed reversible and perfect On-Off responses under a wide range of hydrogen concentrations with large current variations and a fast response time of less than 1 s.
► Palladium-sputtered elastomeric substrate only needs exposure to H2 for cracking.
► The cracked Pd films show nearly perfect reversible On-Off behaviors.
► The elastomeric substrate plays a key role in easing expansion and contraction of broken Pd pieces.
► The role of the film thickness in determining the sensing mode of the sensors is also examined.
Journal: International Journal of Hydrogen Energy - Volume 37, Issue 9, May 2012, Pages 7934–7939