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Title: Reduction of Graphene Oxide Thin Films by Cobaltocene and Decamethylcobaltocene

Abstract

Reduced graphene oxide (RGO) films have been prepared by immersion of graphene oxide (GO) films at room temperature in nonaqueous solutions containing simple, outer-sphere metallocene reductants. Specifically, solutions of cobaltocene, cobaltocene and trifluoroacetic acid (TFA), and decamethylcobaltocene each showed activity for the rapid reduction of GO films cast on a wide variety of substrates. Each reactant increased the conductivity of the films by several orders of magnitude, with RGO films prepared with either decamethylcobaltocene or cobaltocene and TFA possessing the highest conductivities (~104 S m–1). X-ray photoelectron spectroscopy suggested that while all three reagents lowered the content of carbon–oxygen functionalities, solutions of cobaltocene and TFA were the most effective at reducing the material to sp2 carbon. Separately, Raman spectra and atomic force micrographs indicated that RGO films prepared with decamethylcobaltocene consisted of the largest graphitic domains and lowest macroscopic roughness. Cumulatively, the data suggest that the outer-sphere reductants can affect the conversion to RGO but the reactivity and mechanism depend on the standard potential of the reductant and the availability of protons. This work both demonstrates a new way to prepare high-quality RGO films on a wide range of substrate materials without annealing and motivates future work to elucidate themore » chemistry of RGO synthesis through the tunability of outer-sphere reductants such as metallocenes.« less

Authors:
; ; ; ORCiD logo; ORCiD logo
Publication Date:
Research Org.:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1415332
Alternate Identifier(s):
OSTI ID: 1508282
Grant/Contract Number:  
SC006628; SC0006628
Resource Type:
Published Article
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Name: ACS Applied Materials and Interfaces Journal Volume: 10 Journal Issue: 2; Journal ID: ISSN 1944-8244
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; electrochemical; graphene oxide; metallocene; outer-sphere reductant; reduced graphene oxide

Citation Formats

MacInnes, Molly M., Hlynchuk, Sofiya, Acharya, Saurabh, Lehnert, Nicolai, and Maldonado, Stephen. Reduction of Graphene Oxide Thin Films by Cobaltocene and Decamethylcobaltocene. United States: N. p., 2017. Web. doi:10.1021/acsami.7b15599.
MacInnes, Molly M., Hlynchuk, Sofiya, Acharya, Saurabh, Lehnert, Nicolai, & Maldonado, Stephen. Reduction of Graphene Oxide Thin Films by Cobaltocene and Decamethylcobaltocene. United States. doi:10.1021/acsami.7b15599.
MacInnes, Molly M., Hlynchuk, Sofiya, Acharya, Saurabh, Lehnert, Nicolai, and Maldonado, Stephen. Thu . "Reduction of Graphene Oxide Thin Films by Cobaltocene and Decamethylcobaltocene". United States. doi:10.1021/acsami.7b15599.
@article{osti_1415332,
title = {Reduction of Graphene Oxide Thin Films by Cobaltocene and Decamethylcobaltocene},
author = {MacInnes, Molly M. and Hlynchuk, Sofiya and Acharya, Saurabh and Lehnert, Nicolai and Maldonado, Stephen},
abstractNote = {Reduced graphene oxide (RGO) films have been prepared by immersion of graphene oxide (GO) films at room temperature in nonaqueous solutions containing simple, outer-sphere metallocene reductants. Specifically, solutions of cobaltocene, cobaltocene and trifluoroacetic acid (TFA), and decamethylcobaltocene each showed activity for the rapid reduction of GO films cast on a wide variety of substrates. Each reactant increased the conductivity of the films by several orders of magnitude, with RGO films prepared with either decamethylcobaltocene or cobaltocene and TFA possessing the highest conductivities (~104 S m–1). X-ray photoelectron spectroscopy suggested that while all three reagents lowered the content of carbon–oxygen functionalities, solutions of cobaltocene and TFA were the most effective at reducing the material to sp2 carbon. Separately, Raman spectra and atomic force micrographs indicated that RGO films prepared with decamethylcobaltocene consisted of the largest graphitic domains and lowest macroscopic roughness. Cumulatively, the data suggest that the outer-sphere reductants can affect the conversion to RGO but the reactivity and mechanism depend on the standard potential of the reductant and the availability of protons. This work both demonstrates a new way to prepare high-quality RGO films on a wide range of substrate materials without annealing and motivates future work to elucidate the chemistry of RGO synthesis through the tunability of outer-sphere reductants such as metallocenes.},
doi = {10.1021/acsami.7b15599},
journal = {ACS Applied Materials and Interfaces},
number = 2,
volume = 10,
place = {United States},
year = {2017},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1021/acsami.7b15599

Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

Figures / Tables:

Table 1 Table 1: Reported Methods for the Preparation of RGO and the Resulting Conductivity

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