摘要
Strain engineering,as a powerful strategy to tune the optical and electrical properties of two-dimensional(2D)materials by deforming their crystal lattice,has attracted significant interest in recent years.2D materials can sustain ultra-high strains,even up to 10%,due to the lack of dangling bonds on their surface,making them ideal brittle solids.This remarkable mechanical resilience,together with a strong strain-tunable band structure,endows 2D materials with a broad optical and electrical response upon strain.However,strain engineering based on 2D materials is restricted by their nanoscale and strain quantification troubles.In this study,we have modified a homebuilt three-points bending apparatus to transform it into a four-points bending apparatus that allows for the application of both compressive and tensile strains on 2D materials.This approach allows for the efficient and reproducible construction of a strain system and minimizes the buckling effect caused by the van der Waals interaction by adamantane encapsulation strategy.Our results demonstrate the feasibility of introducing compressive strain on 2D materials and the potential for tuning their optical and physical properties through this approach.
基金
the European Research Council(ERC)under the European Union's Horizon 2020 research and innovation program(Nos.755655,ERC-StG 2017 project 2DTOPSENSE)
the Ministry of Science and Innovation(Spain)through the project PID2020-115566RB-I00
the EU FLAG-ERA project To2Dox under the program PCI2019-111893-2
H.L.acknowledges the grant from China Scholarship Council(CSC)under No.201907040070
Ana B.thanks the ERC Union's Horizon 2020 program(No.851929 StG 2019 project 3DScavengers)
the Spanish Ministry of Science and Innovation AEI/10.13039/501100011033(No.PID2019-110430GB-C21)
the EU ERDF(FEDER Operational Program(2014-2020)
A way of making Europe)and the Consejería de Economía,Conocimiento,Empresas y Universidad de la Junta de Andalucía(Nos.P18-RT-3480,EMERGIA and US-1381057).
