We have successfully fabricated sub-100 nm nanogaps in Pd-Ni alloy thin films on an elastomeric substrate by simple stretching. The nanogaps-containing Pd-Ni films were utilized as hydrogen-sensing sponges and their performance was demonstrated to dominate over the performance of similar mobile thin films comprised of pure Pd in major aspects such as the response time, sensitivity in high H2 concentrations, and H2 detection limit. Notably, Pd87.5Ni12.5 hydrogen sensing sponges showed ultra-high sensitive and reversible On-Off behaviors and low detection limit of ∼100 ppm, which were attributed to the reduced nanogap width and the enhanced volume expandability of Pd-Ni lattice. The effects of Ni added to Pd and a search for an optimum Ni concentration were also systematically studied.
Bibliographical noteFunding Information:
This work was supported by the Priority Research Centers Program ( 2010-0028296 ), the Development of hydrogen storage alloys program funded by POSCO, and the Converging Research Center Program through the Ministry of Education, Science, and Technology (No. 2010K001430 ). TL thanks the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2011-0028594 ). SM thanks the RIC Program of MKE and LINC program of MEST in Woosuk University for financial support.
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Condensed Matter Physics
- Energy Engineering and Power Technology