Catalyst Proximity-Induced Functionalization of h‑BN
with Quat Derivatives
Posted on 2019-08-27 - 15:36
Inert single-layer
boron nitride (h-BN) grown on a catalytic metal
may be functionalized with quaternary ammonium compounds (quats) that
are widely used as nonreactive electrolytes. We observe that the quat
treatment, which facilitates the electrochemical transfer of two-dimensional
materials, involves a decomposition of quat ions and leads to covalently
bound quat derivatives on top of the 2D layer. Applying tetraoctylammonium
and h-BN on rhodium, the reaction product is top-alkylized h-BN as
identified with high-resolution X-ray photoelectron spectroscopy.
The alkyl chains are homogeneously distributed across the surface,
and the properties thereof are well-tunable by the choice of different
quats. The functionalization further weakens the 2D material–substrate
interaction and promotes easy transfer. Therefore, the functionalization
scheme that is presented enables the design of 2D materials with tailored
properties and with the freedom to position and orient them as required.
The mechanism of this functionalization route is investigated with
density functional theory calculations, and we identify the proximity
of the catalytic metal substrate to alter the chemical reactivity
of otherwise inert h-BN layers.
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Hemmi, Adrian; Cun, Huanyao; Tocci, Gabriele; Epprecht, Adrian; Stel, Bart; Lingenfelder, Magalí; et al. (2019). Catalyst Proximity-Induced Functionalization of h‑BN
with Quat Derivatives. ACS Publications. Collection. https://doi.org/10.1021/acs.nanolett.9b01792
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AUTHORS (11)
AH
Adrian Hemmi
HC
Huanyao Cun
GT
Gabriele Tocci
AE
Adrian Epprecht
BS
Bart Stel
ML
Magalí Lingenfelder
Ld
Luis Henrique de Lima
MM
Matthias Muntwiler
JO
Jürg Osterwalder
MI
Marcella Iannuzzi
TG
Thomas Greber
CATEGORIES
KEYWORDS
reaction productelectrochemical transferquat treatmentquaternary ammonium compounds2 D materialstop-alkylized h-BNfunctionalization routefunctionalization schemequat ionsalkyl chainsnonreactive electrolytesh-BN layersquat derivativesX-ray photoelectron spectroscopyQuat Derivatives Inert single-layer boron nitridechemical reactivitycatalyst Proximity-Induced Functionalizationtheory calculations2 D layermetal substrate