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 30.11.2014   Карта сайта     Language По-русски По-английски
Новые материалы
Экология
Электротехника и обработка материалов
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Статистика публикаци


30.11.2014

 Proton transport through one-atom-thick crystals




Journal name:

Nature

Year published:


DOI:

doi:10.1038/nature14015



Received


Accepted


Published online








Graphene is increasingly explored as a possible platform for developing novel separation technologies1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19. This interest has arisen because it is a maximally thin membrane that, once perforated with atomic accuracy, may allow ultrafast and highly selective sieving of gases, liquids, dissolved ions and other species of interest2, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19. However, a perfect graphene monolayer is impermeable to all atoms and molecules under ambient conditions1, 2, 3, 4, 5, 6, 7: even hydrogen, the smallest of atoms, is expected to take billions of years to penetrate graphene’s dense electronic cloud3, 4, 5, 6. Only accelerated atoms possess the kinetic energy required to do this20, 21. The same behaviour might reasonably be expected in the case of other atomically thin crystals22, 23. Here we report transport and mass spectroscopy measurements which establish that monolayers of graphene and hexagonal boron nitride (hBN) are highly permeable to thermal protons under ambient conditions, whereas no proton transport is detected for thicker crystals such as monolayer molybdenum disulphide, bilayer graphene or multilayer hBN. Protons present an intermediate case between electrons (which can tunnel easily through atomically thin barriers24) and atoms, yet our measured transport rates are unexpectedly high4, 5 and raise fundamental questions about the details of the transport process. We see the highest room-temperature proton conductivity with monolayer hBN, for which we measure a resistivity to proton flow of about 10 Ω cm2 and a low activation energy of about 0.3 electronvolts. At higher temperatures, hBN is outperformed by graphene, the resistivity of which is estimated to fall below 10−3 Ω cm2 above 250 degrees Celsius. Proton transport can be further enhanced by decorating the graphene and hBN membranes with catalytic metal nanoparticles. The high, selective proton conductivity and stability make one-atom-thick crystals promising candidates for use in many hydrogen-based technologies.


www.ihim.uran.ru/localfiles/nature14015.pdf






 


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  • Chen Wev .  honorary member of ISSC science council

  • Harton Vladislav Vadim  honorary member of ISSC science council

  • Lichtenstain Alexandr Iosif  honorary member of ISSC science council

  • Novikov Dimirtii Leonid  honorary member of ISSC science council

  • Yakushev Mikhail Vasilii  honorary member of ISSC science council

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