Key Laboratory for the Physics and Chemistry of Nanodevices and Department of Electronics, Peking University, Beijing 100871, China.
ACS Appl Mater Interfaces. 2015 May 13;7(18):9581-8. doi: 10.1021/acsami.5b01070. Epub 2015 May 1.
Multifunctional graphene magnetic/hydrogen sensors are constructed for the first time through a simple microfabrication process. The as-fabricated graphene sensor may act as excellent Hall magnetic detector, demonstrating small linearity error within 2% and high magnetic resolution up to 7 mG/Hz(0.5). Meanwhile the same graphene sensor is also demonstrated as high-performance hydrogen sensor with high gas response, excellent linearity, and great repeatability and selectivity. In particular, the graphene sensor exhibits high hydrogen response up to 32.5% when exposed to 1000 ppm hydrogen, outperforming most graphene-based hydrogen sensors. In addition the hydrogen-sensing mechanism of Pd-decorated graphene is systematically explored through investigating its transfer characteristics during gas detection. Our work demonstrates that graphene is a terrific material for multifunctional sensing, which may in principle reduce the complexity of manufacturing process, lower the number of sensors required in the sensing systems, and potentially derive new and more powerful functions.
首次通过简单的微制造工艺构建了多功能石墨烯磁/氢传感器。所制备的石墨烯传感器可用作优异的霍尔磁探测器，在 2%以内的线性误差小，磁分辨率高达 7 mG/Hz(0.5)。同时，相同的石墨烯传感器也被证明是高性能的氢气传感器，具有高气体响应、优异的线性度以及良好的重复性和选择性。特别是，当暴露于 1000 ppm 的氢气时，石墨烯传感器表现出高达 32.5%的高氢气响应，优于大多数基于石墨烯的氢气传感器。此外，通过研究其在气体检测过程中的传输特性，系统地探讨了 Pd 修饰的石墨烯的氢气传感机制。我们的工作表明，石墨烯是一种用于多功能传感的绝佳材料，这可能从原理上降低制造工艺的复杂性，减少传感系统所需的传感器数量，并可能衍生出新的、更强大的功能。
