Physisorption vs. chemisorption of probe molecules on boron nitride nanomaterials: the effect of surface curvature

Literature Information

Publication Date 2013-06-07
DOI 10.1039/C3CP51728D
Impact Factor 3.676
Authors

Albert Rimola, Mariona Sodupe


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Abstract

The adsorption of H2O, NH3 and HCOOH as polar probe molecules and C6H6 and CH4 as non-polar ones on a series of zig-zag (n,0) single-walled boron nitride nanotubes (BNNTs) and on a boron-nitride mono-layer (BNML) has been studied by means of B3LYP-D* periodic calculations. Computed electrostatic potential maps for the pristine BN nanomaterials indicate that the smaller the radius, the larger the polar character. Polar molecules are found to be strongly chemisorbed on small radius BNNTs by means of dative interactions between electron donor atoms of the molecules and B atoms of the BNNTs, H-bonding, as well as dispersive forces. Remarkably, for HCOOH interacting with the (4,0) BNNT, this dative interaction is accompanied by a proton transfer to the nanotube. The corresponding computed adsorption energies decrease sharply with increasing tube radius, gradually approaching the values for physisorption on the BNML. Adsorption of non-polar molecules, mainly dictated by π-stacking (C6H6) and CH–π (CH4) dispersion interactions, is found to be energetically more favorable when physisorbed on large radius BNNTs, the most stable adducts being formed on the BNML.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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