Integrating Water‐Soluble Graphene into Porphyrin Nanohybrids
Source abstract
Abstract
Exfoliation of graphite by a positively charged pyrene derivative was achieved in water and electronic communication by non-invasive electrostatic interaction with a negatively charged porphyrin was accomplished and proven photospectroscopically. The oppositely charged components were assembled through layer by layer deposition. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
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Research context
OpenAlex topics: Graphene research and applications · Molecular Junctions and Nanostructures · Nanopore and Nanochannel Transport Studies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (55)
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48. Notable is however that the equilibrium between free and graphene immobilized1prevents a quantitative emission quenching. Repeatedly performed cycles to remove free1at this state would only lower the effective concentration of graphene/1. Attempts to sediment the final graphene/1dispersion during several hours lead to no further changes in the emission of1. Such a trend prompts to a fully equilibrated system namely free1versus graphene immobilized1.
49. Importantly all features decay within 2 ps–notably faster than in1–leaving only those behind that characterize the excited state of1in its aggregated form (Figure S4).
50. Additionally the1emission was probed upon 340 nm excitation (Figure S6). In the first set of experiments only the concentration of2was changed. Similar to the trends observed with NG/1 in the presence of variable amounts of2the excimer‐like emission converts to the monomer‐like emission of1. In the second set of experiments where only the concentrations of1were varied the same monomer‐like emission evolves. Taken the aforementioned results into consideration we postulate the thermodynamic stabilization of1/2(Figure S7).
51. Reference experiments with a positively charged porphyrin did not yield similar results wherefore a direct interaction with the porphyrin and desorption of the pyrene can be excluded.
52. Interestingly the annotated changes occur despite the lower NG/1concentration when compared to just1indicating a stronger electronic interaction in the presents of NG. This conclusion is borrowed from comparing the relative absorptions of1 which in NG/1are barely visible (Figure 1A).
53. In line with the stronger quenching is the lack of any detectable emission lifetime that falls within the 100 ps time window of our instrumental detection.
54. The corresponding Raman spectrum of NG/1/2as shown in Figure S10 further supports the integrity of the hybrid.
55. In an alternative approach NG/1/2was sequentially deposited onto a poly(styrenesulfonate) (PSS) modified ITO. Here the best deposition performance was found when depositing NG/1during 150 min while applying a cathodic bias of 1V. For the subsequent immobilization of2the aforementioned conditions were used–vide supra.