Buiculescu Valentin, Dinu Livia Alexandra, Veca Lucia Monica, Pârvulescu Cătălin, Mihai Madalina, Brîncoveanu Oana, Comănescu Florin, Brașoveanu Costin, Stoian Marius, Baracu Angela Mihaela
National Institute for Research and Development in Microtechnologies (IMT Bucharest), 126A Erou Iancu Nicolae Street, 077190, Voluntari (Ilfov), Romania.
Mikrochim Acta. 2024 May 10;191(6):323. doi: 10.1007/s00604-024-06397-y.
Bilayer graphene (Bl-Gr) and sulphur-doped graphene (S-Gr) have been integrated with LiTaOsurface acustic wave (SAW) sensors to enhance the performance of NO detection at room temperature. The sensitivity of the Bl-Gr SAW sensors toward NO, measured at room temperature, was 0.29º/ppm, with a limit of detection of 0.068 ppm. The S-Gr SAW sensors showed 0.19º/ppm sensitivity and a limit of detection of 0.140 ppm. The origin of these high sensitivities was attributed to the mass loading and elastic effects of the graphene-based sensing materials, with surface changes caused by the absorption of the NO molecules on the sensing films. Although there are no significant differences regarding the sensitivity and detection limit of the two types of sensors, the measurements in the presence of interferent gases and various humidity conditions outlined much better selectivity and sensing performances towards NO gas for the Bl-Gr SAW sensors.
双层石墨烯（Bl-Gr）和硫掺杂石墨烯（S-Gr）已与钽酸锂表面声波（SAW）传感器集成，以提高室温下NO检测的性能。在室温下测量的Bl-Gr SAW传感器对NO的灵敏度为0.29º/ppm，检测限为0.068 ppm。S-Gr SAW传感器的灵敏度为0.19º/ppm，检测限为0.140 ppm。这些高灵敏度的来源归因于基于石墨烯的传感材料的质量负载和弹性效应，以及传感膜上NO分子吸收引起的表面变化。尽管两种类型的传感器在灵敏度和检测限方面没有显著差异，但在存在干扰气体和各种湿度条件下的测量结果表明，Bl-Gr SAW传感器对NO气体具有更好的选择性和传感性能。
