Superiority of Graphene over Polymer Coatings for Prevention of Microbially Induced Corrosion

Scientific Reports
Ajay KrishnamurthyNikhil Koratkar

Abstract

Prevention of microbially induced corrosion (MIC) is of great significance in many environmental applications. Here, we report the use of an ultra-thin, graphene skin (Gr) as a superior anti-MIC coating over two commercial polymeric coatings, Parylene-C (PA) and Polyurethane (PU). We find that Nickel (Ni) dissolution in a corrosion cell with Gr-coated Ni is an order of magnitude lower than that of PA and PU coated electrodes. Electrochemical analysis reveals that the Gr coating offers ~10 and ~100 fold improvement in MIC resistance over PU and PA coatings respectively. This finding is remarkable considering that the Gr coating (1-2 nm) is ~25 and ~4000 times thinner than the PA (40-50 nm), and PU coatings (20-80 μm), respectively. Conventional polymer coatings are either non-conformal when deposited or degrade under the action of microbial processes, while the electro-chemically inert graphene coating is both resistant to microbial attack and is extremely conformal and defect-free. Finally, we provide a brief discussion regarding the effectiveness of as-grown vs. transferred graphene films for anti-MIC applications. While the as-grown graphene films are devoid of major defects, wet transfer of graphene is shown to introduce lar...Continue Reading

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Citations

Jan 18, 2017·ACS Nano·Alex Yong Sheng EngMartin Pumera
Aug 14, 2019·Advanced Healthcare Materials·Antoine BourrierCécile Delacour
Oct 10, 2020·Environmental Science and Pollution Research International·Anandkumar BalakrishnanJohn Philip
Dec 10, 2020·IScience·Tian Zhang, Pier-Luc Tremblay
Feb 13, 2018·ACS Nano·Govinda ChilkoorVenkataramana Gadhamshetty
Oct 16, 2021·Advanced Materials·Sandhya SusarlaPulickel M Ajayan
Nov 16, 2021·Frontiers in Microbiology·Abhilash Kumar TripathiRajesh Kumar Sani

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Methods Mentioned

BETA
scanning electron microscopy
transmission electron microscopy
cyclic voltammetry
X-ray
chemical vapor deposition
PCR

Software Mentioned

Bowtie2
QIIME
fastq
fastqs
Casava
UPARSE
USEARCH

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