Journal
CHEMICAL SCIENCE
Volume 8, Issue 7, Pages 4771-4778Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7sc01331k
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Funding
- European Research Council under the European Union [320403]
- China Scholarship Council
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The adsorption of catechol (1,2-dihydroxybenzene) on graphene nanoplatelets (GNPs) is investigated electrochemically and spectroscopically. The reversible adsorption of catechol on GNPs is Langmuirian with an adsorption constant of (0.2 +/- 0.002) mM(-1) at low adsorbate concentrations (<= 100 mM). At higher concentrations (>100 mM) the adsorption of catechol on GNPs is shown to undergo a flat to vertical concentration driven phase transition. The kinetics of desorption are measured with a single particle electrochemical technique. The study of individual impacts allows the determination of the rate of catechol desorption from GNPs to be k = 0.08 +/- 0.01 s(-1) with first order kinetics. The method provides a powerful and efficient generic approach to study adsorption and, importantly, desorption of molecules on nanomaterials, as well as giving insight into the modification process.
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