Sensing performance of Pd nanogap supported on an elastomeric substrate in a wide temperature range of –40 to 70 °C

Seyoung Park, Soo Min Lee, Jin Kyo Jeong, Donggu Kim, Hyunsoo Kim, Hyun Sook Lee, Wooyoung Lee

Research output: Contribution to journalArticlepeer-review


We examined the effect of environmental temperature (–40 to 70 °C) on the hydrogen sensing performance of a Pd nanogap sensor supported on an elastomeric polydimethylsiloxane (PDMS) substrate. Sensing tests were conducted using various sensors with different gap widths, prepared with different tensile strains. All sensors operated in an “On-Off” mode with a rapid response time of ~1 s at the operating temperatures. The sensing performance was significantly influenced by the high thermal contraction/expansion properties of the PDMS substrate, depending on the environmental temperature. At subzero temperatures (0, –20, and −40 °C), the sensing performance was improved owing to the gap narrowing. At high temperatures (above 40 °C), it decreased owing to the gap broadening. The detection limit was 300 ppm at subzero temperatures but >1% at high temperatures. The results reveal that the Pd nanogap sensor on PDMS is more suitable for detecting H2 at subzero temperatures. In addition, the sensor showed excellent reproducibility for hundreds of sensing cycles at 25 °C and −40 °C. Furthermore, the sensor was stable to high humidity (above 70 RH%) at 25 °C. Our study demonstrated that the Pd nanogap sensor on a PDMS substrate is a possible candidate for use as an on-board safety H2 sensor in hydrogen-electric vehicles.

Original languageEnglish
Article number130716
JournalSensors and Actuators B: Chemical
Publication statusPublished - 2021 Dec 1

Bibliographical note

Funding Information:
This research was supported by the Basic Science Research Program ( 2017M3A9F1052297 ) of National Research Foundation of Korea (NRF), the Technology Innovation Program ( 20013621 , Center for Super Critical Material Industrial Technology ) funded by the Ministry of Trade, Industry & Energy ( MOTIE , South Korea), and the Priority Research Centers Program ( 2019R1A6A1A11055660 ) of NRF. H.-S. Lee thanks the Basic Research in Science and Engineering Program ( 2021R1A2C1013690 ) of NRF. Here, NRF is funded by Ministry of Science and ICT in South Korea

Publisher Copyright:
© 2021 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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