Interfacial Self-Assembly of Atomically Precise Graphene Nanoribbons into Uniform Thin Films for Electronics Applications

Shekhirev, Mikhail; Vo, Timothy H.; Pour, Mohammad Mehdi; Lipatov, Alexey; Lyding, Joseph W.; Sinitskii, Alexander

doi:10.1021/acsami.6b12508

Cited by 25 publications

(52 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Following the scooping transfer the cGNR-COFs adopt orientations in which the lateral spacing between cGNRs (2.5 nm) lies on an axis perpendicular to the surface and remains out of focus leaving only the πstacking and linker-linker distances to be observed by in-plane elastic scattering. Most notably, the HR-TEM demonstrates that the crystalline domain size (> 400 nm 2 ) is 1-2 orders of magnitude larger than previously reported solution processable GNR films formed via π-stacking alone 27 . cGNR-COFs not only self-assemble into larger crystallites but macromolecular reticulation through directional covalent bonds allows for the rational design of highly anisotropic materials.…”

mentioning

confidence: 55%

Reticular Growth of Graphene Nanoribbon 2D Covalent Organic Frameworks

Veber¹,

Diercks²,

Rogers³

et al. 2019

Preprint

View full text Add to dashboard Cite

Synthesis and characterization covalent organic frameworks (COFs) from a small molecule diamine and polydisperse cove type GNRs (c-GNRs) functionalized with aldehydes. The cGNR-COF films were found to contain crystalline regions (>100 nm2) of imine linked GNRs that could be chemically exfoliated into bilayer/trilayers utilizing a sonication protocol with o-dichlorobenzene (o-DCB).

show abstract

mentioning

confidence: 55%

Reticular Growth of Graphene Nanoribbon 2D Covalent Organic Frameworks

Veber¹,

Diercks²,

Rogers³

et al. 2019

Preprint

View full text Add to dashboard Cite

show abstract

“…GNRs can easily aggregate in the solid state and in solution due to the strong π-π interactions between their large conjugated sp 2 -carbon planes. Both physical approaches (i.e., sonication exfoliation [26] and chemical treatment with a strong acid [53]) have been tested for enhancing the liquid-phase GNR dispersion. However, these approaches generally have limited dispersion effects and visible agglomerates remain.…”

Section: Synthetic Strategies Toward Liquid-phase-processable Gnrsmentioning

confidence: 99%

“…Müllen and colleagues reported that alkyl chain-substituted HBCs formed a discotic liquidcrystalline phase associated with high charge-carrier mobility [59][60][61]. In comparison with smaller HBCs, the supramolecular behavior of GNRs in the liquid phase is less frequently investigated, mainly due to their poor liquid-phase dispersibility [53,62,63]. Although alkyl chain-functionalized GNRs can self-organize into monolayers at the solid-liquid interface ( Figure 1F), their poor dispersibility in organic solvents limits the diversity of GNR supramolecular nanostructures.…”

Section: Supramolecular Nanostructures Of Peo-functionalized Gnrsmentioning

confidence: 99%

Synthetic Engineering of Graphene Nanoribbons with Excellent Liquid-Phase Processability

Niu

Liu

Mai

et al. 2019

Trends in Chemistry

View full text Add to dashboard Cite

Over the past decade, the bottom-up synthesis of structurally defined graphene nanoribbons (GNRs) with various topologies has attracted significant attention due to the extraordinary optical, electronic, and magnetic properties of GNRs, rendering them suitable for a wide range of potential applications (e.g., nanoelectronics, spintronics, photodetectors, and hydrothermal conversion). Remarkable achievements have been made in GNR synthesis with tunable widths, edge structures, and tailor-made functional substitutions. In particular, GNRs with liquid-phase dispersibility have been achieved through the decoration of various functional substituents at the edges, providing opportunities for revealing unknown GNR physiochemical properties. Because of the promise of liquid-phase dispersible GNRs, this mini-review highlights recent advances in their synthetic strategies, physiochemical properties, and potential applications. In particular, deep insights into the advantages and challenges of their syntheses and chemical methodologies are provided to encourage future endeavors and developments. Bottom-up Synthesis of Structurally Defined Graphene Nanoribbons Graphene nanoribbons (GNRs), defined as nanometer-wide strips of graphene, have attracted significant attention as candidates for next-generation semiconductor materials [1-6]. Quantum confinement effects provide GNRs with semiconducting properties, namely, with a finite bandgap that critically depends on their width and edge structures [7-10]. In the past decade, significant effort has been devoted to the synthesis of high-quality GNRs with narrow widths and smooth edges [9,11,12]. Two main strategies have been established for the synthesis of GNRs thus far: 'topdown' and 'bottom-up' approaches. The top-down approach includes the lithographic etching of graphene and unzipping of carbon nanotubes [13-17]. However, these methods generally suffer from low yields and poor structural precision, leading to GNRs with uncontrollable widths and edge structures. Moreover, to achieve precise bandgap control, GNRs should be narrower than 5 nm, which is at the precision limit for the start-of-the-art top-down techniques. In contrast, bottom-up strategies based on the 'on-surface synthesis' or 'solution-based chemical synthesis', namely, 'graphitization' and 'planarization' of tailor-made three-dimensional (3D) polyphenylene precursors, allows access to structurally well-defined GNRs with tunable widths as well as atomically precise edges, including armchair, zigzag, and cove structures [18-22]. Moreover, the precise positioning of heteroatom dopants in GNRs can be realized via this strategy, opening up another pathway for tailoring their optical and electronic properties [23-26]. The liquid-phase processability of GNRs is essential for investigating their fundamental physiochemical properties in solution and for the fabrication of nanoelectronic devices via dip coating or drop casting GNR dispersions on solid substrates [1,27-39].

show abstract

“…38 These solvents, in which a certain amount of GNRs could be dispersed for hours, are promising for the solution processing of nanoribbons. Noteworthy, we recently demonstrated that another solvent that proved to be very effective for dispersing graphene and carbon nanotubes, chlorosulfonic acid, 23,30 can be also be used to form stable solutions of GNRs 14,46 at concentrations as high as 15 mg mL À1 , 46 but for some applications it is preferable to have GNRs dispersed in less corrosive solvents.…”

Section: Dispersions Of Gnrs and Their Optical Propertiesmentioning

confidence: 99%

“…These nanoribbons already have been a subject of several theoretical [39][40][41] and experimental studies. 2,5,[42][43][44][45][46][47][48] We investigated chevron GNRs in solution and found that their optical properties depend on their aggregation state. We also found that in addition to forming bulk aggregates of the p-p stacked nanoribbons, on surfaces GNRs can assemble to form long one-dimensional (1D) structures.…”

Section: Introductionmentioning

confidence: 99%