A surface engineering approach is exploited to enhance the performance of H2 sensors consisting of a single-wall carbon nanotube film/graphene 3D electrode decorated with catalytic Pt nanoparticles using atomic layer deposition (Pt-NPs/SWCNTs/Gr). Specifically, C-band ultraviolet (UVC) radiation has been applied on the Pt-NPs/SWCNTs/Gr sensors for up to 20 minutes to activate the carbon surface and enhanced H2 sensitivity and response speed have been obtained. Remarkably, at the optimal UVC irradiation of 10 minutes (intensity of 4.6 mW/cm2), the H2 gas response was enhanced by up to 4.3 fold, together with an enhanced response speed by 3.6 times as compared to that of the as-made Pt-NPs/SWCNTs/Gr sensors before the UVC irradiation. Specifically, a high H2 response up to 32% has been achieved at 10% H2 concentration. This enhancement can be attributed to desorption of residual molecules adsorbed on the SWCNTs and graphene surfaces during the sensor fabrication using UVC irradiation. This result illustrates the importance of the carbon surface activation in development of high-performance H2 sensors using carbon nanostructures. The obtained high performance in the Pt-NPs/SWCNTs/Gr sensors can be attributed to the large sensing surface area of SWCNT films with carbon surface activated using UVC treatment, the catalytic benefit of the conformally coated Pt-NPs, and high mobility signal transport through graphene. In addition, this result demonstrates that the UVC irradiation can provide an effective, non-destructive, and facile method to activate the carbon surface on sensors composed of carbon nanostructures.

中文翻译：

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紫外线激活 Pt 纳米粒子/SWCNT/石墨烯纳米杂化物增强 H钪 敏感性


采用表面工程方法来增强 H2 传感器的性能，该传感器由单壁碳纳米管膜/石墨烯 3D 电极组成，并使用原子层沉积 (Pt-NPs/SWCNTs/Gr) 装饰有催化 Pt 纳米颗粒。具体来说，C 波段紫外线 (UVC) 辐射已应用于 Pt-NP/SWCNT/Gr 传感器长达 20 分钟，以激活碳表面，并获得了增强的 H2 灵敏度和响应速度。值得注意的是，在 10 分钟的最佳 UVC 照射（强度为 4.6 mW/cm2）下，与原始 Pt 相比，氢气响应增强高达 4.3 倍，响应速度增强 3.6 倍-UVC 照射前的 NPs/SWCNTs/Gr 传感器。具体来说，在 10% 的氢气浓度下，氢气响应高达 32%。这种增强可归因于在使用 UVC 照射的传感器制造过程中吸附在单壁碳纳米管和石墨烯表面上的残留分子的解吸。这一结果说明了碳表面活化在开发使用碳纳米结构的高性能氢气传感器中的重要性。 Pt-NP/SWCNT/Gr 传感器获得的高性能可归因于使用 UVC 处理激活碳表面的 SWCNT 薄膜的大传感表面积、保形涂层 Pt-NP 的催化优势以及高迁移率信号传输通过石墨烯。此外，这一结果表明，UVC 照射可以提供一种有效、非破坏性且简便的方法来激活由碳纳米结构组成的传感器上的碳表面。