Journal Pre-proofs An ultrasensitive immunosensor based on manganese dioxide-graphene nano- platelets and core shell Fe 3 O 4 @Au nanoparticles for label-free detection of carcinoembryonic antigen Preeyanut Butmee, Gamolwan Tumcharern, Gerald Thouand, Kurt Kalcher, Anchalee Samphao PII: S1567-5394(19)30607-3 DOI: https://doi.org/10.1016/j.bioelechem.2019.107452 Reference: BIOJEC 107452 To appear in: Bioelectrochemistry Received Date: 6 September 2019 Revised Date: 23 December 2019 Accepted Date: 23 December 2019 Please cite this article as: P. Butmee, G. Tumcharern, G. Thouand, K. Kalcher, A. Samphao, An ultrasensitive immunosensor based on manganese dioxide-graphene nanoplatelets and core shell Fe 3 O 4 @Au nanoparticles for label-free detection of carcinoembryonic antigen, Bioelectrochemistry (2019), doi: https://doi.org/10.1016/ j.bioelechem.2019.107452 This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. © 2019 Published by Elsevier B.V.