resumo
Electromechanical response of materials is a key property for various applications ranging from actuators to sophisticated nanoelectromechanical systems. Here electromechanical properties of the single-layer graphene transferred onto SiO2 calibration grating substrates is studied via piezoresponse force microscopy and confocal Raman spectroscopy. The correlation of mechanical strains in graphene layer with the substrate morphology is established via Raman mapping. Apparent vertical piezoresponse from the single-layer graphene supported by underlying SiO2 structure is observed by piezoresponse force microscopy. The calculated vertical piezocoefficient is about 1.4 nm V-1, that is, much higher than that of the conventional piezoelectric materials such as lead zirconate titanate and comparable to that of relaxor single crystals. The observed piezoresponse and achieved strain in graphene are associated with the chemical interaction of graphene's carbon atoms with the oxygen from underlying SiO2. The results provide a basis for future applications of graphene layers for sensing, actuating and energy harvesting.
palavras-chave
MONOLAYER GRAPHENE; STRAIN
categoria
Science & Technology - Other Topics
autores
Rodrigues, GD; Zelenovskiy, P; Romanyuk, K; Luchkin, S; Kopelevich, Y; Kholkin, A
nossos autores
Andrei Kholkin
Investigador Jubilado
Gonçalo da Cunha Rodrigues
Bolseiro de investigação
Konstantin Nikolaevich Romanyuk
Investigador Júnior
Sergey Luchkin
Estudante de doutoramentoProjectos
Nanolectromechanics of graphene (PTDC/CTM-NAN/121313/2010)
CICECO - Aveiro Institute of Materials (UID/CTM/50011/2013)
NANOMOTION - Nanoelectromechanical Motion in Functional Materials (NANOMOTION)
agradecimentos
G.d.C.R., K.R., and A.K. acknowledge the financial support of the Portuguese Foundation for Science and Technology (FCT) and CICECO - Aveiro Institute of Materials via the grants PTDC/CTM-NAN/121313/2010 and UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when applicable co-financed by FEDER under the PT2020 Partnership Agreement. K.R. is grateful to the financial support of FCT via his post-doctoral grant SFRH/BPD/88362/2012. The work was partly supported by the European Commission within FP7 Marie Curie Initial Training Network 'Nanomotion' (grant agreement no 290158). The equipment of the Ural Center for Shared Use 'Modern nanotechnology' UrFU was used. The research was made possible in part by the Ministry of Education and Science of the Russian Federation (UID RFMEFI59414X0011). Y.K. is grateful for the financial support of CNPq and FAPESP.