Next Article in Journal
Automatic Classification Using Machine Learning for Non-Conventional Vessels on Inland Waters
Previous Article in Journal
In-Situ Data-Driven Buffeting Response Analysis of a Cable-Stayed Bridge
Open AccessArticle

Hydrogen Sensing Using Paper Sensors with Pencil Marks Decorated with Palladium

1
Department of Chemistry, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea
2
Energy Materials Metrology, Korea Research Institute of Standards and Science, 267 Gajeong-ro, Yuseong-gu, Daejeon 34113, Korea
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(14), 3050; https://doi.org/10.3390/s19143050
Received: 21 June 2019 / Revised: 6 July 2019 / Accepted: 8 July 2019 / Published: 10 July 2019
(This article belongs to the Section Chemical Sensors)
Paper-based sensors fabricated using the pencil-on-paper method are expected to find wide usage in many fields owing to their low cost and high reproducibility. Here, hydrogen (H2) detection was realized by applying palladium (Pd) nanoparticles (NPs) to electronic circuits printed on paper using a metal mask and a pencil. We confirmed that multilayered graphene was produced by the pencil, and then characterized Pd NPs were added to the pencil marks. To evaluate the gas-sensing ability of the sensor, its sensitivities and reaction rates in the presence and absence of H2 were measured. In addition, sensing tests performed over a wide range of H2 concentrations confirmed that the sensor had a detection limit as low as 1 ppm. Furthermore, the sensor reacted within approximately 50 s at all H2 concentrations tested. The recovery time of the sensor was 32 s at 1 ppm and 78 s at 1000 ppm. Sensing tests were also performed using Pd NPs of different sizes to elucidate the relationship between the sensing rate and catalyst size. The experimental results confirmed the possibility of fabricating paper-based gas sensors with a superior sensing capability and response rate. View Full-Text
Keywords: hydrogen; H2 sensing; paper-based sensor; pencil marks; palladium; chemiresistor hydrogen; H2 sensing; paper-based sensor; pencil marks; palladium; chemiresistor
Show Figures

Graphical abstract

MDPI and ACS Style

Lee, N.H.; Baek, U.-B.; Nahm, S.-H. Hydrogen Sensing Using Paper Sensors with Pencil Marks Decorated with Palladium. Sensors 2019, 19, 3050.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map

1
Back to TopTop