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Open research questions in Graphene research and applications

62 unresolved questions extracted from the limitations and future-work sections of 432 Graphene research and applications papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Further research could investigate the use of chemisorption of individual hydrogen atoms on graphene for quantum technologies. The development of new quantum devices using ultra-long-range spin coupling could be explored. Theoretical models could be developed to understand the mechanisms underlying the observed ultra-long-range spin coupling.

    Ultra-long-range spin coupling in graphene revealed by atomically resolved spin excitations · 2026 · DOI

  • The challenge of combining atomic scale control with sufficiently strong long-range interactions remains a gap in the field. Prior research has focused on enhancing spin lifetimes and coherence times, but has not demonstrated ultra-long-range spin coupling.

    Ultra-long-range spin coupling in graphene revealed by atomically resolved spin excitations · 2026 · DOI

  • Converting triplet excitons into singlet excitons due to the moderately large singlet-triplet energy gap (ΔEST). Achieving high RISC rates. Developing efficient blue emitters for ultrahigh-definition displays.

    Topological structure optimization of B,N-doped nanographenes for deep-blue emitters · 2026 · DOI

  • Imaging magnetotransport at the nanoscale is challenging due to the need for high sensitivity and resolution. The complex interplay of intrinsic MR, carrier hydrodynamics, interface resistance, and device geometry makes it difficult to interpret experimental results.

    Direct imaging of magnetotransport at graphene-metal interfaces with a single-spin quantum sensor · 2026 · DOI

  • The complexity of the tight-binding model. The limitation of the model to small deformations. The need for further miniaturization of devices and its components.

    Band structure of stress-strain graphene taking into account dislocation and disclination loops · 2026 · DOI

  • Agglomeration of graphene nanoparticles. Increased porosity with higher graphene content. Limited understanding of the relationship between graphene content and wear resistance.

    Grafen Takviye Miktarının Fe Esaslı Hibrit Nanokompozitlerin Mekanik ve Aşınma Özellikleri Üzerindeki Etkisi · 2026 · DOI

  • By pumping high-quality graphite with an intense MIR pulse, we provide direct spectroscopic evidence of robust Floquet-induced gaps in both the VB and CB of graphite, despite the presence of photo-excitation and interlayer coupling. The Floquet-induced gap, Floquet sideband and relaxation of photo-excited carriers are disentangled through their distinct timescales. Note that while the carrier relaxation time slightly increases from monolayer graphene to bulk graphite42, carrier relaxation occurs on a timescale of at least several hundred femtoseconds, much longer than the 114 fs temporal window of Floquet-induced gap, allowing the gap to be detected before scattering sets in. Such large timescale mismatch enables the formation of Floquet-induced gap despite the presence of additional scattering channels, and here the short pump and probe pulses are important for the successful detection of such gaps. 7 -0.50.00.5-0.50.00.5-0.50.00.5-0.50.00.5-0.50.00.5-0.10.00.1-0.10.00.1-0.10.00.1-0.10.00.1-0.10.00.1E-EF (eV)Intensity (a.u.)ΔV (meV)E-EF (eV)Intensity (a.u.)(a)Δt (fs)ky (Å-1)E-EF (eV)Δt = -200 fs0 fs33 fs200 fs67 fs(b)(c)(d)(e)(f)(g)(h)(i)(j)ћω -200 fs0 fs33 fs67 fs200 fsΔVΔVk1k11k3k9k1k11-0.50.00.5-0.4-0.20.0k32001000-2000200(k)(l) The observation of Floquet-induced avoided-crossing gaps in bulk graphite opens opportunities for exploring light-field-engineered phases in graphite. Looking forward, several important questions remain to be addressed both experimentally and theoretically. First of all, regarding the interplay between coherent light-field dressing and scattering following photo-excitation: if a longer pump pulse with strong enough light-field strength is applied, can the light-induced hybridization gap still survive and be detected experimentally? Secondly, for the photon energy used here, the dispersion at the corresponding kz resembles that of monolayer graphene. What happens if the probe photon energy is tuned to access different kz values? Will the splitting of the Dirac cone affect the Floquet-induced gaps? Finally, a central question is what light-induced emergent phenomena can be realized in graphite? How do they differ from those in monolayer graphene, and what exotic phases can be achieved in graphite beyond those predicted in graphene? Addressing these questions will pave the way toward harnessing Floquet engineering to design and control novel quantum phases in bulk materials. Acknowledgement This work is supported by the National Natural Science Foundation of China (Grant No. 12234011,12421004), Tsinghua University Initiative Scientific Research Program (Grant No. 20251080106), the National Natural Sci- ence Foundation of China (Grant No. 52388201, 12327805), and New Cornerstone Science Foundation through the XPLORER PRIZE.

    Robust Floquet-indued gap in irradiated graphite · 2026 · DOI

  • While the paper establishes that layer-selective hydrogenation-dehydrogenation cycles operate with 12.5 s duration at specified gate voltages (Vt and Vb), the scalability and cycling stability of this electrochemical process over hundreds or thousands of cycles, and degradation mechanisms in the ionic gate structure, remain unexplored.

    Layer-selective hydrogenation and proton transport in twisted bilayer graphene · 2026 · DOI

  • The control measurements on AB bilayers show that full insulating transitions require sequential application of large potentials to opposite sides, but the paper does not characterize the intermediate conduction states or quantify the energy barriers for proton penetration across the graphene layers as a function of applied gate voltage.

    Layer-selective hydrogenation and proton transport in twisted bilayer graphene · 2026 · DOI

  • Conventional graphene synthesis methods have limitations, such as requiring high temperatures, vacuum systems, or hazardous chemicals. There is a need for a simpler and potentially more sustainable route for producing graphene.

    Laser-induced graphene for micro- and nano-manufacturing: fundamentals, processing approaches, and emerging applications · 2026 · DOI

  • Laser-induced graphene has evolved into a multifunc- tional platform technology that combines simple pro- cessing, scalability, and multifunctionality. Its open-air, lithography-free fabrication, compatibility with diverse precursors and substrates, and seamless integration with flexible device architectures have enabled broad applica- tions in biosensing, physical and chemical sensing, and energy storage and conversion systems. These strengths position LIG as a highly attractive material platform for next-generation wearable, portable, and sustainable elec- tronic technologies. At the same time, several important challenges still need to be addressed before LIG can be more widely translated into practical systems. Long-term environ- mental and mechanical stability remains a key concern under repeated deformation, prolonged humidity expo- sure, and chemically harsh conditions. However, recent efforts in encapsulation strategies, composite integration, structural design optimization, and substrate engineering have already begun to improve the operational durabil- ity of LIG-based devices. Poor adhesion to flexible sub- strates also continues to limit reliability, yet approaches based on surface activation, interfacial modification, embedded device architectures, and transfer-free fabri- cation are showing clear promise in strengthening inter- facial robustness. In parallel, variations in morphology, conductivity, and electrochemical activity across large areas still hinder reproducible manufacturing, although increasing attention is being given to better control of laser parameters, atmosphere-assisted processing, real- time monitoring, and data-driven optimization. Despite growing recognition of the need for standardization, progress toward broadly accepted LIG-specific protocols and benchmarking frameworks remains limited. In the absence of broadly accepted LIG-specific standards, com- parative tables, synthesis maps, and reporting checklists may serve as practical interim tools for improving cross- study benchmarking and supporting more reliable scale- up. Another critical issue is the limited understanding of defect engineering. Nevertheless, growing efforts that combine advanced spectroscopy, in situ characterization, and theoretical modeling are beginning to clarify how defects, edge sites, heteroatom doping, and local bonding configurations govern LIG performance. These ongoing developments suggest that the current limitations of LIG are not static barriers, but rather active research frontiers that are steadily being addressed. Looking forward, the impact of LIG is likely to extend well beyond conventional sensing and energy devices toward emerging fields such as bioelectronics, soft robot- ics, environmental remediation, and smart packaging. Future progress will depend not only on improved mate- rial quality, but also on more predictive and integrated manufacturing strategies, including AI-assisted optimi- zation of laser parameters, multimaterial co-writing with metals, oxides, or functional polymers, and hybrid addi- tive manufacturing-LIG systems for three-dimensional Choi and Ko Micro & Nano Manufacturing (2026) 2:12 and application-specific device construction. More systematic advances in interface engineering, defect control, standardized performance evaluation, and scal- able process design will be essential for bridging the gap between laboratory demonstrations and practical deploy- ment. Overall, LIG should be recognized not merely as a synthesis route for graphene-like materials, but as an enabling manufacturing strategy for flexible, sustainable, and high-performance electronic systems.

    Laser-induced graphene for micro- and nano-manufacturing: fundamentals, processing approaches, and emerging applications · 2026 · DOI

  • The fragility and limited tunability of even-denominator states in conventional GaAs heterostructures. The need for direct probes of exchange statistics to confirm the non-Abelian nature of the 5/2 state.

    Cascade of even-denominator fractional quantum Hall states in mixed-stacked multilayer graphene · 2026 · DOI

  • Direct probes of exchange statistics to confirm the non-Abelian nature of the 5/2 state. Experimental studies of non-Abelian quasiparticles in mixed-stacked graphene. Further tuning of correlated topological phases in this system.

    Cascade of even-denominator fractional quantum Hall states in mixed-stacked multilayer graphene · 2026 · DOI

  • The experiment is limited by the inherent twist-angle disorder in the sample. The QTM junction is modelled as a three-plate capacitor, which may not capture all the complexities of the system.

    Imaging the flat bands of magic-angle graphene reshaped by interactions · 2026 · DOI

  • Further studies can use the QTM to explore other quantum materials and regimes. The QTM can be used to probe the electronic properties of materials in previously inaccessible regimes. Theoretical models can be developed to better understand the QTM's capabilities and limitations.

    Imaging the flat bands of magic-angle graphene reshaped by interactions · 2026 · DOI

  • The study does not investigate the long-term stability of the nanofluids. The study only considers a limited range of concentrations (1, 3, and 5%). The study does not compare the results with other types of nanofluids.

    Synthesis of graphene oxide via ball milling and characterization of its nanofluid properties · 2026 · DOI

  • Investigating the long-term stability of graphene oxide nanofluids. Evaluating the potential of graphene oxide nanofluids for other applications. Comparing the results with other types of nanofluids.

    Synthesis of graphene oxide via ball milling and characterization of its nanofluid properties · 2026 · DOI

  • The use of diversified reducing agents for producing rGO. The application of reduced graphene oxide in smart textiles, electronics, photonics, battery and supercapacitors, health monitoring, biomedical and nanomedicine fields.

    Biological reduction of graphene oxide and its application onto cotton fabric for multifunctional properties · 2026 · DOI

  • The current methods of reduction are not cost-effective and environment-friendly. There is a need for a biological reduction method that is cost-effective and environment-friendly.

    Biological reduction of graphene oxide and its application onto cotton fabric for multifunctional properties · 2026 · DOI

  • The role of molecular topology in MR-TADF properties has not been fully investigated. The impact of planarity on the photophysical properties of B,N-doped nanographenes is not well understood.

    Topological structure optimization of B,N-doped nanographenes for deep-blue emitters · 2026 · DOI

  • To apply the technique to other materials and devices to study magnetotransport phenomena. To further develop the scanning single-spin quantum magnetometer for improved sensitivity and resolution.

    Direct imaging of magnetotransport at graphene-metal interfaces with a single-spin quantum sensor · 2026 · DOI

  • Further studies can investigate the electronic properties of other non-centrosymmetric mixed-stacked multilayer graphene systems. Theoretical models can be developed to describe the electronic properties of these systems. Experimental techniques can be improved to explore the emergent correlated and topological electronic states.

    Intrinsic Layer Polarization and Multi-flatband Transport in Non-centrosymmetric Mixed-Stacked Multilayer Graphene · 2026 · DOI

  • The electronic properties of non-centrosymmetric mixed-stacked multilayer graphene are not well understood. The interplay between spontaneous symmetry breaking and Berry curvatures is not fully explored.

    Intrinsic Layer Polarization and Multi-flatband Transport in Non-centrosymmetric Mixed-Stacked Multilayer Graphene · 2026 · DOI

  • The study identifies a gap in the understanding of the effects of vacancy defects on the buckling behavior of graphene nanoplates. The study aims to contribute to the understanding of the behavior of graphene nanoplates with vacancy defects.

    Effects of size and atomic defects on the buckling of single-layer and double-layer graphene nanoplates using AFEM · 2026 · DOI

  • Further study of the pairing mechanism is needed. Investigation of superconductivity in other types of graphene. Analysis of the potential applications of superconducting rhombohedral graphene.

    Superconductivity from dual-surface carriers in rhombohedral graphene · 2026 · DOI

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62 open questions have been extracted from the limitations and future-work passages of 432 Graphene research and applications papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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