In this study, we fabricated a surface acoustic wave (SAW) device using a langasite (LGS) substrate. The p-phenylenediamine-reduced graphene oxide (PrGO)-coated LGS substrate resulted in high response sensor systems for very short time scale detection of NO₂ and CO. With the catalytic reaction of PrGO, the resonant frequency of 100 ppm of NO₂ gas changed by ∼3.50 kHz, which is nearly eight times higher than that of the pristine LGS SAW device. Further, we conducted selectivity tests for NO, NH₃, H₂S, and CO gases; the results showed that the PrGO-coated LGS had higher selectivity for NO₂ compared to other gases. Accordingly, the underlying mechanism for the superior NO₂ sensing was discussed in relation to the morphological characteristics and configuration of PrGO. In addition, the effect of humidity on the SAW performance was studied under ambient NO₂.

在这项研究中，我们使用 langasite (LGS) 衬底制造了表面声波 (SAW) 器件。对苯二胺还原氧化石墨烯 (PrGO) 涂层的 LGS 基板产生了高响应传感器系统，用于在非常短的时间内检测 NO ₂和 CO。在 PrGO 的催化反应下，100 ppm NO ₂气体的共振频率变化了~3.50 kHz，几乎是原始 LGS SAW 器件的 8 倍。此外，我们还对 NO、NH ₃、H ₂ S 和 CO 气体进行了选择性测试；结果表明，与其他气体相比，PrGO 涂层的 LGS 对 NO ₂具有更高的选择性。因此，优越的 NO ₂的潜在机制讨论了与 PrGO 的形态特征和配置相关的传感。此外，在环境 NO ₂下研究了湿度对 SAW 性能的影响。