Organic adsorbates have higher affinities to fluorographene than to graphene

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F16%3A33161599" target="_blank" >RIV/61989592:15310/16:33161599 - isvavai.cz</a>

Výsledek na webu

<a href="http://www.sciencedirect.com/science/article/pii/S2352940716301275" target="_blank" >http://www.sciencedirect.com/science/article/pii/S2352940716301275</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.apmt.2016.09.016" target="_blank" >10.1016/j.apmt.2016.09.016</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Organic adsorbates have higher affinities to fluorographene than to graphene

Popis výsledku v původním jazyce

The large surfaces of two-dimensional carbon-based materials, such as graphene and fluorographene, are exposed to analytes, impurities and other guest molecules, so an understanding of the strength and nature of the molecule-surface interaction is essential for their practical applications. Using inverse gas chromatography, we determined the isosteric adsorption enthalpies and entropies of six volatile organic molecules (benzene, toluene, cyclohexane, n-hexane, 1,4-dioxane, and nitromethane) to graphene and graphite fluoride powders. The adsorption entropies of the molecules ranged from MINUS SIGN 17 to MINUS SIGN 34 cal/mol K and the maximum adsorption-induced entropy loss occurred for nitromethane at the high-energy sites. The enthalpies of bulkier adsorbates were almost coverage-independent on both surfaces and ranged from MINUS SIGN 11 to MINUS SIGN 14 kcal/mol. Despite the fact that fluorographene has lower surface energy than graphene and graphene represents an ideal surface for the π-π stacking, the adsorbates had lower adsorption enthalpies to fluorographene than to graphene by TILDE OPERATOR+D919%. These findings imply that bulkier airbone organic contaminants readily adsorb to the investigated surfaces and can modify the measured surface properties.

Název v anglickém jazyce

Organic adsorbates have higher affinities to fluorographene than to graphene

Popis výsledku anglicky

The large surfaces of two-dimensional carbon-based materials, such as graphene and fluorographene, are exposed to analytes, impurities and other guest molecules, so an understanding of the strength and nature of the molecule-surface interaction is essential for their practical applications. Using inverse gas chromatography, we determined the isosteric adsorption enthalpies and entropies of six volatile organic molecules (benzene, toluene, cyclohexane, n-hexane, 1,4-dioxane, and nitromethane) to graphene and graphite fluoride powders. The adsorption entropies of the molecules ranged from MINUS SIGN 17 to MINUS SIGN 34 cal/mol K and the maximum adsorption-induced entropy loss occurred for nitromethane at the high-energy sites. The enthalpies of bulkier adsorbates were almost coverage-independent on both surfaces and ranged from MINUS SIGN 11 to MINUS SIGN 14 kcal/mol. Despite the fact that fluorographene has lower surface energy than graphene and graphene represents an ideal surface for the π-π stacking, the adsorbates had lower adsorption enthalpies to fluorographene than to graphene by TILDE OPERATOR+D919%. These findings imply that bulkier airbone organic contaminants readily adsorb to the investigated surfaces and can modify the measured surface properties.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CF - Fyzikální chemie a teoretická chemie

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Applied Materials Today

ISSN

2352-9407

e-ISSN

—

Svazek periodika

5

Číslo periodika v rámci svazku

DEC

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

"142-149"

Kód UT WoS článku

000392950300017

EID výsledku v databázi Scopus

2-s2.0-84991833373