High thermal conductivity in semiconducting Janus and non-Janus diamanes. (15th October 2020)

• Record Type: Journal Article
• Authors: Raeisi, Mostafa; Mortazavi, Bohayra; Podryabinkin, Evgeny V.; Shojaei, Fazel; Zhuang, Xiaoying; Shapeev, Alexander V.
• Is Part Of: Carbon. Volume 167(2020)
• Page Start: 51
• Page End: 61
• Publication Date: 2020-10-15
• Subjects: Diamane -- 2D materials -- Semiconductors -- Thermal conductivity -- Machine learning; Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2020.06.007
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: Most recently, F-diamane monolayer was experimentally realized by the fluorination of bilayer graphene. In this work we elaborately explore the electronic and thermal conductivity responses of diamane lattices with homo or hetero functional groups, including: non-Janus C2 H, C2 F and C2 Cl diamane and Janus counterparts of C4 HF, C4 HCl and C4 FCl. Noticeably, C2 H, C2 F, C2 Cl, C4 HF, C4 HCl and C4 FCl diamanes are found to show electronic diverse band gaps of, 3.86, 5.68, 2.42, 4.17, 0.86, and 2.05 eV, on the basis of HSE06 method estimations. The thermal conductivity of diamane nanosheets was acquired using the full iterative solutions of the Boltzmann transport equation, with substantially accelerated calculations by employing machine-learning interatomic potentials in obtaining the anharmonic force constants. According to our results, the room temperature lattice thermal conductivity of graphene and C2 H, C2 F, C2 Cl, C4 HF, C4 HCl and C4 FCl diamane monolayers are estimated to be 3636, 1145, 377, 146, 454, 244 and 196 W/mK, respectively. The underlying mechanisms resulting in significant effects of functional groups on the thermal conductivity of diamane nanosheets were thoroughly explored. Our results highlight the substantial role of functional groups on the electronic and thermal conduction responses of diamane nanosheets.