Carbon molecular sieve-functionalized graphene sensors for highly sensitive detection of ethanol
Carbon molecular sieve-functionalized graphene sensors for highly sensitive detection of ethanol
复制标题
用于高灵敏度乙醇检测的碳分子筛功能化石墨烯传感器
DOI：
10.1016/j.carbon.2022.01.023
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发表时间：
2022
期刊：
影响因子：
10.9
通讯作者：
Hiroshi Mizuta
中科院分区：
文献类型：
--
作者：
Sankar Ganesh Ramaraj;Manoharan Muruganathan;Osazuwa G. Agbonlahor;Hisashi Maki;Yosuke Onda;Masashi Hattori;Hiroshi Mizuta
石墨烯的表面功能化使其能够应用于低浓度挥发性有机化合物的轻松检测。在本文中，我们证明了使用化学气相沉积（CVD）制备的石墨烯纳米带（GNRs）的碳分子筛（CMS）功能化将其乙醇气体传感性能提高了三个数量级。使用氦离子显微镜和拉曼光谱确认GNR上CMS层的存在。使用透射电子显微镜证实GNR的CMS官能化的孔隙率。与CVD GNR场效应晶体管（FET）不同，CMS功能化GNR FET（CMSF-GFET）显示出50 ppb的灵敏度，并且传感性能随着温度的升高而提高。CMSF-GFET的高灵敏度可以归因于CMSs的催化活性和吸附的乙醇分子之间的偶极相互作用，这导致增强的石墨烯-乙醇电荷转移和货车德瓦尔斯相互作用。使用电荷中性点视差（CNPD）方法研究了这种电荷转移对所施加的调谐电压的依赖性。结果发现，CNPD值随着乙醇气体浓度的增加而增加，证实CMS官能化诱导吸附的乙醇分子和GNR表面之间的偶极相互作用。
The surface functionalisation of graphene enables its application for the facile detection of low-concentration volatile organic compounds. Herein, we demonstrated that the carbon molecular sieve (CMS) functionalisation of graphene nanoribbons (GNRs) prepared using chemical vapour deposition (CVD) enhances their ethanol gas sensing performance by three orders of magnitude. The presence of the CMS layer on the GNRs was confirmed using helium ion microscopy and Raman spectroscopy. The porosity of the CMS functionalization of GNRs was confirmed using transmission electron microscopy. Unlike the CVD GNR field-effect transistor (FET), the CMS-functionalised GNR FET (CMSF-GFET) showed a sensitivity of 50 ppb, and the sensing performance improved with an increase in temperature. The high sensitivity of the CMSF-GFET can be attributed to the catalytic activity of the CMSs and the dipole interaction between the adsorbed ethanol molecules, which led to enhanced graphene-ethanol charge transfer and van der Waals interaction. The dependence of this charge transfer on the applied tuning voltage was investigated using the charge neutrality point disparity (CNPD) method. It was found that the CNPD value increased with an increase in the ethanol gas concentration, confirming that the CMS functionalisation induced the dipole interaction between the adsorbed ethanol molecules and the GNR surface.