title: Anisotropic MoS2Nanosheets Grown on Self-Organized Nanopatterned Substrates.
abstract: Manipulating the anisotropy in 2D nanosheets is a promising way to tune or trigger functional properties at the nanoscale. Here, a novel approach is presented to introduce a one-directional anisotropy in MoS2nanosheets via chemical vapor deposition (CVD) onto rippled patterns prepared on ion-sputtered SiO2/Si substrates. The optoelectronic properties of MoS2are dramatically affected by the rippled MoS2morphology both at the macro- and the nanoscale. In particular, strongly anisotropic phonon modes are observed depending on the polarization orientation with respect to the ripple axis. Moreover, the rippled morphology induces localization of strain and charge doping at the nanoscale, thus causing substantial redshifts of the phonon mode frequencies and a topography-dependent modulation of the MoS2workfunction, respectively. This study paves the way to a controllable tuning of the anisotropy via substrate pattern engineering in CVD-grown 2D nanosheets.
authors.affiliation: Laboratorio MDM, IMM-CNR, via C. Olivetti 2, I-20864, Agrate Brianza (MB), Italy.
authors.forename: Christian
authors.initials: C
authors.lastname: Martella
authors.affiliation: Dipartimento di Fisica, Università di Genova, via Dodecaneso 33, I-16146, Genova (Ge), Italy.
authors.forename: Carlo
authors.initials: C
authors.lastname: Mennucci
authors.affiliation: Laboratorio MDM, IMM-CNR, via C. Olivetti 2, I-20864, Agrate Brianza (MB), Italy.
authors.forename: Eugenio
authors.initials: E
authors.lastname: Cinquanta
authors.affiliation: Laboratorio MDM, IMM-CNR, via C. Olivetti 2, I-20864, Agrate Brianza (MB), Italy.
authors.forename: Alessio
authors.initials: A
authors.lastname: Lamperti
authors.affiliation: Istituto dei Sistemi Complessi (ISC)-CNR, U.O.S. Sapienza, 00185, Roma, Italy.|Dipartimento di Fisica, Università "La Sapienza,", P.le A. Moro 2, I-00185, Roma, Italy.
authors.forename: Emmanuele
authors.initials: E
authors.lastname: Cappelluti
authors.affiliation: Dipartimento di Fisica, Università di Genova, via Dodecaneso 33, I-16146, Genova (Ge), Italy.
authors.forename: Francesco
authors.initials: F
authors.lastname: Buatier de Mongeot
authors.affiliation: Laboratorio MDM, IMM-CNR, via C. Olivetti 2, I-20864, Agrate Brianza (MB), Italy.
authors.forename: Alessandro
authors.initials: A
authors.lastname: Molle
keywords: 2D materials; anisotropy; molybdenum disulfide; self-organized nanopatterning; transition metal dichalcogenides