Romanian Journal of Information Science and Technology (ROMJIST)

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ROMJIST is a publication of Romanian Academy,
Section for Information Science and Technology

Editor – in – Chief:

Academician Dan Dascalu

Secretariate (office):
Adriana Apostol
Adress for correspondence: romjist@nano-link.net (after 1st of January, 2019)

Editing of the printed version: Mihaela Marian (Publishing House of the Romanian Academy, Bucharest)

Technical editor
of the on-line version:
Lucian Milea (University POLITEHNICA of Bucharest)

Sponsors:
• National Institute for R & D
in Microtechnologies
(IMT Bucharest), www.imt.ro
• Association for Generic
and Industrial Technologies (ASTEGI), www.astegi.ro

ROMJIST Volume 22, No. 1, 2019, pp. 30-40, Paper no. 616/2019
 

Florin Comanescu, Anca Istrate, Munizer Purica
Assessing by Raman spectroscopy the quality of CVD graphene transferred on oxidized silicon and quartz substrates

ABSTRACT: We present the results of a study regarding CVD graphene transfer from copper foil to other substrates - oxidized silicon and quartz by means of electrochemical delamination. Transfer results were examined by means of Raman spectroscopy using a laser at 633 nm and confocal optical microscopy to identify graphene in good optical contrast conditions. Characteristic Raman bands of graphene - D, G and 2D are certifying if a transfer process has been performed successfully. The quality of the transferred graphene are evidenced by the modifications in the main graphene Raman bands D, G, 2D from which quality (I2D/IG) and defect (ID/IG) ratio’s were extracted. We are also highlighting critical steps in the transfer process. The final step of Polymethyl methacrylate (PMMA) removal is the most critical one due to the partially folding of graphene. After transfer defects are induced in graphene which is confirmed by the increase of the ratio of the intensity of the D band to the G (ID/IG).

KEYWORDS: Raman spectroscopy, CVD graphene, graphene transfer by electrochemical delamination, transferred graphene quality

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