Conducting Nanofibers: Diagonal Scrolling of 2D Nanosheets into 1D Nanostructures via In Situ Self-Assembly

Abstract

Scrolling mechanism is considered as a significant process to tune the dimensionality of nanostructures. Remarkably, rolling of ultrathin two-dimensional (2D) layered graphene nanosheets into one-dimensional (1D) nanotubes perceived versatile applications in nanomedicine and organic electronics. Nevertheless, this exceptional phenomenon is observed in limited 2D π-conjugated systems until now, and it is essential to extend it toward feasible organic systems. Herein, we reported two porphyrin-derived systems (P1 and P2), in which P2 composed of porphyrin and benzothiadiazole with directional amide hydrogen-bonding moiety acts as a good electron donor–acceptor system. Consequently, P2 showed high-conducting 1D nanofibers from the diagonal scrolling of 2D nanosheets via in situ self-assembly. Photophysical properties of P2 revealed J-type aggregates in cyclohexane, while P1 exists as monomers. Cyclic voltammetry analysis of P2 showed the ease of oxidation compared to P1 owing to the efficient electron transfer from donor to acceptor derivative. Microscopic analysis suggests that P2 depicts 2D nanosheets with an average diameter of 1–3 μm upon diagonal scrolling of 1D nanofibers of width 1–1.5 μm and length several micrometers. Electrochemical impedance analysis revealed that 1D nanofibers of P2 depict electrical conductivity in the range of 1.5 ± 0.2 S/cm. Thereby, these derivatives highlight that NIR absorption and their efficient optoelectronic characteristics promote the alternatives for inorganic semiconductors in organic electronics.

Structurally directed thienylenevinylene self-assembly for improved charge carrier mobility: 2D sheets vs. 1D fibers

“…S3a, ESI †). 22,23 Sharp IR bands at 2920 and 2852 cm À1 for both T1 and T2 may be due to the alkyl chain interdigitation in the self-assembled state. 24,25 Also, the -CH 2 -scissoring band at 1466 cm À1 was probed to confirm the arrangement of the alkyl chains.…”

Conducting 1D nanostructures from light-stimulated copper-metalated porphyrin–dibenzothiophene

“…Hence, the protonation and anion binding of P Fb -DBT and P Cu -DBT not only regulate the optical and electrochemical properties in the solution state but also have an impact on molecular packing, as we can conclude from the formation of nanoflakes and 1D nanostructures. 44–50…”

“…Hence, the protonation and anion binding of P Fb -DBT and P Cu -DBT not only regulate the optical and electrochemical properties in the solution state but also have an impact on molecular packing, as we can conclude from the formation of nanoflakes and 1D nanostructures. [44][45][46][47][48][49][50] Furthermore, powder X-ray diffraction analyses of neutral and charged samples were recorded and they were found to be crystalline and amorphous in nature under different conditions (Fig. 6a).…”

Metalloporphyrin-Decorated Titanium Dioxide Nanosheets for Efficient Photocatalytic Carbon Dioxide Reduction

“…Self-assembly photocatalysis with excellent activity has drawn wide attention in recent years. − In this work, MTCPP/TiO 2 was fabricated by a layer-by-layer self-assembly process. First, abundant carboxyl and hydroxyl on porphyrin were adsorbed by metal ions.…”