We present a unique three-dimensional palladium (Pd)-decorated crumpled reduced graphene oxide ball (Pd-CGB) nanocomposite for hydrogen (H₂) detection in air at room temperature. Pd-CGB nanocomposites were synthesized using a rapid continuous flame aerosol technique. Graphene oxide reduction and metal decoration occurred simultaneously in a high-temperature reducing jet (HTRJ) process to produce Pd nanoparticles that were below 5 nm in average size and uniformly dispersed in the crumpled graphene structure. The sensors made from these nanocomposites were sensitive over a wide range of H₂ concentrations (0.0025–2%) with response value, response time, and recovery time of 14.8%, 73 s, and 126 s, respectively, at 2% H₂. Moreover, they were sensitive to H₂ in both dry and humid conditions. The sensors were stable and recoverable after 20 cycles at 2% H₂ with no degradation associated with volume expansion of Pd. Unlike two-step methods for fabricating Pd-decorated graphene sensors, the HTRJ process enables single-step formation of Pd- and other metal-decorated graphene nanocomposites with great potential for creating various gas sensors by simple drop-casting onto low-cost electrodes.

中文翻译：

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使用火焰合成的钯装饰的皱纹还原氧化石墨烯纳米复合材料在室温下进行氢气感测。

我们提出了一种独特的三维钯（Pd）装饰的皱纹还原氧化石墨球（Pd-CGB）纳米复合材料，用于在室温下的空气中检测氢气（H ₂）。使用快速连续火焰气溶胶技术合成了Pd-CGB纳米复合材料。氧化石墨烯的还原和金属装饰在高温还原射流（HTRJ）过程中同时发生，以生产平均尺寸小于5 nm且均匀分散在皱折的石墨烯结构中的Pd纳米颗粒。由这些纳米复合材料制成的传感器在宽范围的H ₂浓度（0.0025–2％）内敏感，在2％H _2下的响应值，响应时间和恢复时间分别为14.8％，73 s和126 s。。而且，他们对H敏感₂在干燥和潮湿的条件下。传感器在2％H _2下经过20个循环后稳定且可恢复，且无与Pd体积膨胀相关的降解。与制造Pd修饰的石墨烯传感器的两步法不同，HTRJ工艺能够一步形成Pd修饰的金属修饰的石墨烯纳米复合材料，并具有通过简单的直接浇铸到低成本电极上来制造各种气体传感器的巨大潜力。