Non-covalent Functionalization of Graphene to Tune Its Band Gap and Stabilize Metal Nanoparticles on Its Surface
Metadatos
Mostrar el registro completo del ítemEditorial
American Chemical Society
Fecha
2020-07-22Referencia bibliográfica
ACS Omega 2020, 5, 18849−18861 [https://dx.doi.org/10.1021/acsomega.0c02006]
Patrocinador
Spanish Government RTI2018101558-B-C21; Junta de Andalucia PAIDI FQM273 RMN342; University of Jaen EI_FQM6-2019Resumen
Controlling graphene conductivity is crucial for its potential applications. With this focus, this paper shows the effect
of the non-covalent bonding of a pyrimidine derivative (HIS) on the electronic properties of graphene (G). Several G-HIS hybrids
are prepared through mild treatments keeping unaltered the structures of both G and HIS. The attachment of HIS to G occurs by
π−π stacking of the HIS-aromatic residue with the G surface. This partially blocks the pz electrons of G, giving rise to the splitting of
both the valence and conduction bands. Moreover, the width of the splitting is directly related to the HIS content. This fact allows
the fine-tuning of the band gap of G-HIS hybrids. Furthermore, HIS keeps its metal-complexing ability in the G-HIS hybrids. Taking
advantage of this, a G-HIS−Cu(0) composite was prepared by H2 plasma reduction of a precursor of the G-HIS−Cu(II) type. GHIS−
Cu(0) contains Cu(0) clusters stabilized on the G surface due to interactions with the COO− functions of HIS. In an
analogous hybrid, G-HIS−Au(0), the Au(0) NPs are also stabilized by COO− functions. This material, consisting of the coupling of
Au(0) NPs and G-HIS, photocatalyzed water reduction under visible light radiation producing 12.5 μmol·g−1·h−1of hydrogen.