Jiao Zijie, Wang Lingyun, Xu Xiaotong, Xiang Jie, Huang Shuiming, Lu Tao, Hou Xueling
School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China.
Shanghai King Material Technology Ltd., East Huiwang Road, Jiading, Shanghai 201815, China.
Materials (Basel). 2024 Sep 5;17(17):4382. doi: 10.3390/ma17174382.
The development of a sensor capable of selectively detecting hydrogen levels in the environment holds immense importance for ensuring the safer utilization of hydrogen energy. In this study, a hydrogen sensor made of Ce-doped single-layer graphene (SLG)/SnO composite material was fabricated using a hydrothermal method. The study examined the impact of varying Ce doping concentrations on the hydrogen sensing capabilities of the SLG/SnO matrix. The results show that the SLG/SnO hydrogen sensor doped with 2 mol% Ce demonstrated optimal performance at a humidity of 20%. It operated most efficiently at 250 °C, with a response of 2.49, representing a 25.75% improvement over the undoped sample. The response/recovery times were 0.46/3.92 s, which are 54.9% shorter than those of the undoped sample. The enhancement in hydrogen sensitivity stems from the synergistic effect of Ce and SLG, which facilitates the coexistence of n-n and p-n heterojunctions, thereby increasing carrier mobility and refining grain structure. Analysis via X-ray photoelectron spectroscopy (XPS) reveals that Ce increases the material's oxygen vacancy concentration, enhancing its hydrogen sensitivity. Ce-doped SLG/SnO, with its robust hydrogen sensitivity, represents one of the leading candidates for future hydrogen gas sensors.
开发一种能够选择性检测环境中氢气水平的传感器对于确保氢能的安全利用具有极其重要的意义。在本研究中，采用水热法制备了一种由铈掺杂单层石墨烯（SLG）/SnO复合材料制成的氢气传感器。该研究考察了不同铈掺杂浓度对SLG/SnO基体氢气传感能力的影响。结果表明，掺杂2 mol%铈的SLG/SnO氢气传感器在湿度为20%时表现出最佳性能。它在250°C时运行效率最高，响应值为2.49，比未掺杂样品提高了25.75%。响应/恢复时间为0.46/3.92 s，比未掺杂样品短54.9%。氢气灵敏度的提高源于铈和SLG的协同效应，这促进了n-n和p-n异质结的共存，从而提高了载流子迁移率并细化了晶粒结构。通过X射线光电子能谱（XPS）分析表明，铈增加了材料的氧空位浓度，提高了其氢气灵敏度。铈掺杂的SLG/SnO具有强大的氢气灵敏度，是未来氢气传感器的主要候选材料之一。
