Wang Boyi, Hashishin Takeshi, Dao Dzung Viet, Zhu Yong
School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan 430070, China.
Faculty of Advanced Science & Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan.
Sensors (Basel). 2022 May 22;22(10):3926. doi: 10.3390/s22103926.
To stabilize the detection signal of palladium-based hydrogen sensors on paper substrates, a graphite intermediate layer was painted on the surface of paper. The graphite-on-paper (GOP) substrate offers advantages such as good thermo-electrical conductivity, low cost, and uncomplicated preparation technology. Quasi-1-dimensional palladium (Pd) thin films with 8 nm and 60 nm thicknesses were deposited on the GOP substrates using the vacuum evaporation technique. Thanks to the unique properties of the GOP substrate, a continuous Pd microfiber network structure appeared after deposition of the ultra-thin Pd film. Additionally, the sensing performance of the palladium-based hydrogen sensor was not affected, whether using GOP or paper substrate at 25 °C. Surprisingly, heating-induced loss of sensitivity was restrained due to the increased electrical conductivity of the GOP substrate at 50 °C.
为了稳定纸基钯基氢传感器的检测信号，在纸表面涂覆了一层石墨中间层。纸基石墨（GOP）衬底具有热电导率良好、成本低和制备工艺简单等优点。采用真空蒸发技术在GOP衬底上沉积了厚度为8nm和60nm的准一维钯（Pd）薄膜。由于GOP衬底的独特性能，在超薄Pd膜沉积后出现了连续的Pd微纤维网络结构。此外，在25℃下，无论使用GOP衬底还是纸基衬底，钯基氢传感器的传感性能均不受影响。令人惊讶的是，在50℃时，由于GOP衬底电导率的增加，加热引起的灵敏度损失得到了抑制。
