Work Function Maps and Surface Topography Characterization of Nitroaromatic-Ended Dendron Films on Graphite

Abstract

Surface topography and work function maps were simultaneously obtained for carbon surfaces modified by a dendritic molecule: 3,5-Bis (3,5-dinitrobenzoylamino) benzoic acid. The dendrons were spontaneously assembled onto highly ordered pyrolytic graphite samples, exhibiting an increase in the surface potential. This fact is consistent with the incorporation of an electron-acceptor functional group that remains electroactive on the surface.

Tuning the work function of graphene toward application as anode and cathode

“…The electrodes in these devices either inject or extract an electron from the semiconductor. Any mismatch of the WFs between organic semiconductors and electrodes results in high contact resistance, which decreases the charge injection and extraction efficiency [21][22][23]. Therefore, clever design of graphene with both high electron injection (low WF) and high hole injection (high WF) abilities is in demand [24][25][26][27][28][29].…”

Different synthetic pathways of nanoparticle-cored dendrimers (NCDs): Effects on the properties and their application as redox active centers

“…The immobilization of NCDs on GC electrodes through self‐assembly was carried out as schematically shown in Scheme . It has been demonstrated that the free dendron is capable to rapidly self‐assemble on carbon surfaces through its aromatic moieties . Thus, the presence of dendrons in the NCDs was exploited to act as a linker to efficiently immobilize the modified NPs onto carbon surface, while the nitro groups were expected to provide redox activity .…”

KPFM and DFT as tools to correlate the charge distribution and molecular orientation of dendritic adsorbates on different surfaces

“…The adsorption of G1-NO 2 dendrons on HOPG, from exploring the electrochemical behavior through the electro-active nitroso/hydroxylamine couple, was previously reported by our group [26][27][28]. G1-NO 2 is physisorbed on the carbon surface favoured by π-π stacking interactions between the aromatic rings of the dendrons and the benzene ring structure of HOPG [26,27].…”

“…Previously, our group has worked on the adsorption of 3,5-bis (3,5dinitrobenzoylamino) benzoic acid (G1-NO 2 ) on HOPG. The physicochemical and electrical properties of these dendron layers were evaluated by electrochemical techniques [26] and KPFM in air [27]. In a subsequent study, this was extended to a second generation of nitro dendrons (G2-NO 2 ) [28].…”