Influence of dopants on the impermeability of graphene / Mallineni S. S. K.,Boukhvalov D. W.,Zhidkov I. S.,Kukharenko A. I.,Slesarev A. I.,Zatsepin A. F.,Cholakh S. O.,Rao A. M.,Serkiz S. M.,Bhattacharya S.,Kurmaev E. Z.,Podila R. // NANOSCALE. - 2017. - V. 9, l. 18. - P. 6145-6150.

ISSN/EISSN:

2040-3364 / 2040-3372

Type:

Article

Abstract:

Graphene has attracted much attention as an impermeable membrane and a protective coating against oxidation. While many theoretical studies have shown that defect-free graphene is impermeable, in reality graphene inevitably has defects in the form of grain boundaries and vacancies. Here, we study the effects of N-dopants on the impermeability of few-layered graphene (FLG) grown on copper using chemical vapor deposition. The grain boundaries in FLG have minimal impact on their permeability to oxygen as they do not provide a continuous channel for gas transport due to high tortuosity. However, we experimentally show that the N-dopants in FLG display multiple configurations that create structural imperfections to selectively allow gas molecules to permeate. We used a comprehensive array of tools including Raman spectroscopy, X-ray photoelectron spectroscopy, optically stimulated electron emission measurements, and density functional theory of N-doped graphene on copper to elucidate the effects of dopant configuration on the impermeability of graphene. Our results clearly show that oxygen can permeate through graphene with non-graphitic nitrogen dopants that create pores in graphene and oxidize the underlying Cu substrate while graphitic nitrogen dopants do not show any changes compared to the pristine form. Furthermore, we observed that the work function of graphene can be tuned effectively by changing the dopant configuration.

Author keywords:

NITROGEN-DOPED GRAPHENE; WATER DESALINATION; FUNCTIONALIZATION; MEMBRANES; SHEETS; FILMS

DOI:

10.1039/c7nr00949f

Web of Science ID:

ISI:000401146200046

Соавторы в МНС:

Другие поля

Поле	Значение
Month	MAY 14
Publisher	ROYAL SOC CHEMISTRY
Address	THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Language	English
EISSN	2040-3372
Keywords-Plus	NITROGEN-DOPED GRAPHENE; WATER DESALINATION; FUNCTIONALIZATION; MEMBRANES; SHEETS; FILMS
Research-Areas	Chemistry; Science \& Technology - Other Topics; Materials Science; Physics
Web-of-Science-Categories	Chemistry, Multidisciplinary; Nanoscience \& Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied
Author-Email	rpodila@g.clemson.edu
ResearcherID-Numbers	Boukhvalov, Danil/F-7517-2017 Serkiz, Steven/T-4718-2017 Zhidkov, Ivan/L-3543-2013
ORCID-Numbers	Serkiz, Steven/0000-0002-9048-5085 Zhidkov, Ivan/0000-0001-8727-4730 Cholakh, Seif/0000-0002-9313-6614 Podila, Ramakrishna/0000-0003-0472-2361
Funding-Acknowledgement	Russian Federation {[}MK-1145.2017.2]; Government of Russian Federation {[}02.A03.21.0006]; Russian Federal Agency of Science Organizations 437 {[}01201463326]; Clemson University; Ministry of Education and Science of the Russian Federation {[}3.7372.2017/BCh]; Savannah River National Labs {[}LDRD-2015-00058]
Funding-Text	XPS measurements were supported by the grant program of the President of Russian Federation (Grant No. MK-1145.2017.2), the Government of Russian Federation (Act 211, Agreement No. 02.A03.21.0006), and the Russian Federal Agency of Science Organizations 437 (Project ``Electron{''} No. 01201463326). R. P. acknowledges Clemson University for providing startup funds. D. W. B. acknowledges support from the Ministry of Education and Science of the Russian Federation (Project No. 3.7372.2017/BCh). S. B., S. S., and A. M. R. thank Savannah River National Labs LDRD-2015-00058 for funding.
Number-of-Cited-References	28
Usage-Count-Last-180-days	12
Usage-Count-Since-2013	14
Journal-ISO	Nanoscale
Doc-Delivery-Number	EU6LT