Lee Nam Hee, Baek Un-Bong, Nahm Seung-Hoon
Department of Chemistry, KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea.
Energy Materials Metrology, Korea Research Institute of Standards and Science, 267 Gajeong-ro, Yuseong-gu, Daejeon 34113, Korea.
Sensors (Basel). 2019 Jul 10;19(14):3050. doi: 10.3390/s19143050.
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 (H) 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 H were measured. In addition, sensing tests performed over a wide range of H concentrations confirmed that the sensor had a detection limit as low as 1 ppm. Furthermore, the sensor reacted within approximately 50 s at all H 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.
采用纸上铅笔法制造的纸质传感器，因其低成本和高再现性，有望在许多领域得到广泛应用。在此，通过使用金属掩膜和铅笔将钯（Pd）纳米颗粒（NPs）应用于纸上印刷的电子电路来实现氢气（H）检测。我们证实铅笔能产生多层石墨烯，然后将经过表征的Pd NPs添加到铅笔痕迹中。为评估该传感器的气敏能力，测量了其在有和没有H存在时的灵敏度和反应速率。此外，在广泛的H浓度范围内进行的传感测试证实该传感器的检测限低至1 ppm。此外，该传感器在所有测试的H浓度下约50 s内作出反应。该传感器在1 ppm时的恢复时间为32 s，在1000 ppm时为78 s。还使用不同尺寸的Pd NPs进行传感测试，以阐明传感速率与催化剂尺寸之间的关系。实验结果证实了制造具有卓越传感能力和响应速率的纸质气体传感器的可能性。
