Jin Zhang

Peking University | PKU · Department of Chemistry

2D transitional metal dichalcogenides (TMDs) have attracted great interest for their advantageous application in room‐temperature broadband photodetectors. Developing effective strategies to optimize the photo‐carrier dynamical process of monolayer TMDs is still urgently necessary to extend wavelength range and reduce dark current due to the theore...

As a typical kind of high‐performance fibers, heterocyclic aramid fibers are widely used to reinforce resins to prepare advanced lightweight composites with high mechanical performances. However, their poor interfacial shear strength limits the combination with resins and leads to undesirable interfacial strength of composites. Thus, heterocyclic a...

Graphdiyne (GDY) is an artificial carbon allotrope that is conceptually similar to graphene but composed of sp ‐ and sp ² ‐hybridized carbon atoms. Monolayer GDY (ML‐GDY) is predicted to be an ideal two‐dimensional (2D) semiconductor material with a wide range of applications. However, its synthesis has posed a significant challenge, leading to dif...

As the most promising candidates for the implementation of in-sensor computing, retinomorphic vision sensors can constitute built-in neural networks and directly implement multiply-and-accumulation operations using responsivities as the weights. However, existing retinomorphic vision sensors mainly use a sustained gate bias to maintain the responsi...

Poly(p‐phenylene‐benzimidazole‐terephthalamide) (PBIA) fibers with excellent mechanical properties are widely used in fields that require impact‐resistant materials such as ballistic protection and aerospace. The introduction of heterocycles in polymer chains increases their flexibility and makes it easier to optimize the fiber structure during spi...

Heterocyclic aramid fibers, a typical kind of high-performance fibers, have been widely used in aerospace and protection fields because of their excellent mechanical properties. However, the application of heterocyclic aramid fibers as a reinforcement is hindered by the weak interfacial combination with matrix materials, especially epoxy. Tradition...

The chirality structure of a single-walled carbon nanotube (SWNT) strongly depends on the composition of catalyst used in the chemical vapor deposition process. In this study, we develop a porous magnesia supported manganese-rhenium (MnRe/MgO) catalyst for chirality-selective synthesis of SWNTs. Detailed characterizations reveal that (6,5) tubes wi...

By virtue of remarkable biocompatibility and their promising applications in biomedical fields, biomass‐regenerated fibers, such as wool keratin fiber and cellulose fiber, have attracted extensive attention. However, the insufficient mechanical performance still hinders their yarn manufacturing capability and further large‐scale applications. Herei...

The characterization of interlayer coupling in two-dimensional van der Waals heterostructures (vdWHs) is essential to understand their quantum behaviors and structural functionalities. Interlayer shear and layer-breathing (LB) phonons carry rich information on interlayer interaction, but they are usually too weak to be detected via standard Raman s...

Bilayer graphene provides a versatile platform for exploring a variety of intriguing phenomena and shows much promise for applications in electronics, optoelectronics, etc. Controlled growth of large-area bilayer graphene is therefore highly desired yet still suffers from a slow growth rate and poor layer uniformity. Meanwhile, graphene wrinkles, i...

Synthetic high-performance fibers present excellent mechanical properties and promising applications in the impact protection field. However, fabricating fibers with high strength and high toughness is challenging due to their intrinsic conflicts. Herein, we report a simultaneous improvement in strength, toughness, and modulus of heterocyclic arami...

Realizing efficient hydrogenation of N2 molecules in the electrocatalytic nitrogen reduction reaction (NRR) is crucial in achieving high activity at a low potential because it theoretically requires a higher equilibrium potential than other steps. Analogous to metal hydride complexes for N2 reduction, achieving this step by chemical hydrogenation c...

The chiral charge density wave is a many-body collective phenomenon in condensed matter that may play a role in unconventional superconductivity and topological physics. Two-dimensional chiral charge density waves provide the building blocks for the fabrication of various stacking structures and chiral homostructures, in which physical properties s...

Developing a convenient method to determine the complete structure of single-walled carbon nanotubes (SWNTs) is important to achieve the fully controlled growth of this nanomaterial. However, approaches that can identify handedness at the atomic level with simple equipment, operation, and data analysis are still lacking. Here, the SWNTs/graphene (G...

Negative thermal expansion (NTE) is an effect of a material contracting upon heating, and NTE materials are useful for the preparation of zero thermal expansion (ZTE) composite materials for applications in energy conversion and electronic devices. In this work, the NTE behaviour of graphdiyne (GDY) was observed and studied by temperature-dependent...

Outside back cover image: An optically modulated dual‐mode memristor array based on core‐shell CsPbBr3@graphdiyne nanocrystals is developed, which can emulate both the artificial synapses and neurons in the dark and illumination conditions, respectively. Based on this dual‐mode memristor, a power‐free artificial nociceptive signal processing system...

Morphology significantly affects material's electronic, catalytic, and magnetic properties, especially for 2D crystals. Abundant achievements have been made in the morphology engineering of high‐symmetry 2D materials, but for the emerging low‐symmetry ones, such as ReS2, both the morphology control technique and comprehension are lacking. Here, the...

Vertical graphene (VG) arrays show exposed sharp edges, ultra‐low electrical resistance, large surface‐to‐volume ratio, and low light reflectivity, thus having great potential in emerging applications, including field emission, sensing, energy storage devices, and stray light shields. Although plasma enhanced chemical vapor deposition (PECVD) is re...

Two-dimensional (2D) semiconductors are promising in channel length scaling of field-effect transistors (FETs) due to their excellent gate electrostatics. However, scaling of their contact length still remains a significant challenge because of the sharply raised contact resistance and the deteriorated metal conductivity at nanoscale. Here, we cons...

Lithium metal is the most promising anode for lithium batteries, but the growth of lithium dendrites leads to rapid attenuation of battery capacity and a series of safety problems during the plating/stripping process. Utilization of carbon materials for improving the Li metal anode stability represents a feasible strategy; particularly, the high af...

Artificial synapses and neurons are crucial milestones for neuromorphic computing hardware, and memristors with resistive and threshold switching characteristics are regarded as the most promising candidates for the construction of hardware neural networks. However, most of the memristors can only operate in one mode, that is, resistive switching o...

Synthetic high-performance fibers, such as polyaramid fibers, have attracted particular attention owing to their excellent mechanical properties and promising applications in safety protection fields. However, fabricating fibers with high strength and toughness is challenging due to their intrinsic conflicts. Herein, we report a simultaneous improv...

The development of human society has set unprecedented demands for advanced fiber materials, such as lightweight and high-performance fibers for reinforcement of composite materials in frontier fields and functional and intelligent fibers in wearable electronics. Carbonene materials composed of sp2-hybridized carbon atoms have been demonstrated to...

Graphdiyne (GDY), a two-dimensional (2D) carbon material with diacetylenic linkages (-C≡C-C≡C-) structures, has attracted enormous attention in various fields. However, the controlled synthesis of GDY films is still challenging because of the low alkyne coupling efficiency and out-of-plane growth. Here, we employed a highly efficient Cu(II)-N,N,N',...

Employing Al foil current collector at the potassium anode side is an ideal choice to entail low‐cost and high‐energy potassium metal battery (PMB). Nevertheless, the poor affinity between potassium and planar Al can cause uneven K plating/stripping and hence undermined anode performance, which remains a significant challenge to be addressed. Herei...

The electron density of state near saddle points in an electronic band structure is greatly enhanced, forming the well-known Van Hove singularity (VHS), which leads to strengthened electron–photon coupling. However, the VHS-related electron–phonon interaction is rarely studied. Here we report the first observation of intra-mini valley phonon scatte...

Alloying is widely applied to tailor properties of 2D materials. Here, we develop a space‐confined chemical vapor deposition (CVD) strategy to homogeneously grow 100 μm‐sized monolayer 1T’‐MoTe2 in batches. Aberration‐corrected annular dark‐field scanning transmission electron microscopy combined with density functional theory calculations is appli...

New electronic devices require high‐frequency responsive electrochemical capacitors, and the appreciable capacitance density and a fast rate capability, which depend greatly on the electrode material. For more details of the latest advances in the design and controllable fabrication of carbon‐related electrode materials, such as planar 2D, random 3...

Poly(p‐phenylene‐benzimidazole‐terephthalamide) (PBIA) fibers, a kind of heterocyclic aramid fibers, possess extraordinary mechanical properties and advanced applications in aerospace, military protection, and other civilian areas. However, harsh application scenarios are putting forward even stringent requirements for the mechanical performances a...

High-quality single-walled carbon nanotubes (SWNTs) were synthesized on layered double hydroxides (LDHs) containing Fe and FeCo by CO chemical vapor deposition (CVD). Systematic investigations were performed to study the effects of temperature and catalyst composition on the diameter and chirality distributions of SWNTs. It was revealed that both c...

The edges of two-dimensional (2D) materials can exhibit special structure and thus distinctive properties differing from the interior, such as the modified photoluminescence emission, the improved electrocatalytic activity, and the enhanced nonlinear optical response. In this work, we report the observation of abrupt enhancement of Raman scattered...

Photonic topological insulators with robust boundary states can enable great applications for optical communication and quantum emission, such as unidirectional waveguide and single-mode laser. However, because of the diffraction limit of light, the physical insight of topological resonance remains unexplored in detail, like the dark line that exis...

With the continuous progress in electronic devices, thermal interface materials (TIMs) are urgently needed for the fabrication of integrated circuits with high reliability and performance. Graphene as a wonderful additive is often added into polymer to build composite TIMs. However, owing to the lack of a specific design of the graphene skeleton, t...

Raman scattering spectroscopy has been a necessary and accurate tool not only for characterizing lattice structure of materials, but also for probing electron-photon and electron-phonon interactions. In the quantum picture, electrons at ground states can be excited to intermediate energy levels by photons at different k-points in the Brillouin zone...

The assembly of single-walled carbon nanotubes (CNTs) into high-density horizontal arrays is strongly desired for practical applications, but challenges remain despite myriads of research efforts. Herein, we developed a non-destructive soft-lock drawing method to achieve ultraclean single-walled CNT arrays with a very high degree of alignment (angl...

. Surface passivation can eliminate the charge doping of monolayer transition metal dichalcogenides (TMDs) during the device fabrication, which is important for the large‐scale production of ultra‐stable materials and high‐performance devices. The uniformity and atomical thickness of the passivating layers with a low dielectric constant (κ) are ess...

The past two decades witnessed the thriving of non-conventional nanoparticles in catalytic synthesis of single-walled carbon nanotubes (SWNTs). However, most of the SWNTs are limited to growing on a flat surface which usually suffers low output, thus making the evaluation of SWNT chirality distribution challenging. In this work, we report a solid m...

High‐frequency responsive electrochemical capacitors (ECs), which can directly convert alternating current (AC) to direct current (DC), are getting more essential for the rapid development of electronic devices. In order to satisfy the requirements of ECs with fast rate capability, appreciable capacitance density, numerous efforts have been made to...

Bulk synthesis of single-walled carbon nanotubes (SWNTs) using solid catalyst has been challenging, despite of recent breakthrough in the chirality-specific growth on the flat substrate surface. In this work, we propose a porous magnesia support rhenium catalyst for bulk synthesis of SWNTs. It is found that the well-dispersed catalyst with a high m...

A SiC supported iron (Fe–SiC) catalyst was developed for chemical vapor deposition (CVD) growth of carbon nanotubes. Using CO as the carbon source, sole Fe–SiC catalyst was mostly inactive for synthesizing carbon nanotubes and only trace amount of carbon deposits was produced. In contrast, the powder Fe–SiC catalyst could be activated by pressing t...

Grain boundaries (GBs) play a central role in the fracture of polycrystals. However, the complexity of GBs and the difficulty in monitoring the atomic structure evolution during fracture greatly limit the understanding of the GB mechanics. Here, in situ aberration-corrected scanning transmission electron microscopy and density functional theory cal...

Graphdiyne (GDY), with specific configuration of sp- and sp2-hybridized carbon atoms, is a kind of two-dimensional carbon allotrope. A series of approaches have been developed to synthesisze thin films of GDY, however, the controlled synthesis of GDY films on arbitrary metal substrates with good crystallinity still remains challenging. Herein, we p...

Non-invasive, high-throughput spectroscopic techniques can identify chiral indices (n,m) of carbon nanotubes down to the single-tube level1–6. Yet, for complete characterization and to unlock full functionality, the handedness, the structural property associated with mirror symmetry breaking, also needs to be identified accurately and efficiently7–...

High‐density horizontally aligned single‐walled carbon nanotube (SWNT) arrays with high‐purity semiconducting tubes are promising materials for energy‐efficient electronics. However, realizing high density and high semiconducting purity through the direct‐growth method is still a challenge. Here the problem is overcome through a spatially confined...

Colloidal quantum dots are promising photoactive materials that enable plentiful photonic and optoelectronic applications ranging from lasers, displays and photodetectors to solar cells1–9. However, these applications mainly utilize the linear optical properties of quantum dots, and their great potential in the broad nonlinear optical regime is sti...

Memory plays a vital role in modern information society. High‐speed and low‐power nonvolatile memory is urgently demanded in the era of big data. However, ultrafast nonvolatile memory with nanosecond‐timescale operation speed and long‐term retention is still unavailable. Herein, an ultrafast nonvolatile memory based on van der Waals heterostructure...

Synthesis of high‐quality single‐walled carbon nanotubes arrays with pure semiconducting type is crucial for the fabrication of integrated circuits in nanoscale. However, the naturally grown carbon nanotubes usually have diverse structures and properties. Here the bicomponent catalyst using Au and ZrO2 is designed and prepared. The Au nanoparticle...

A magnesium‐modification strategy was developed for anchoring catalyst nanoparticles on sapphire, leading to a higher performance by offering a stronger metal‐support interaction (SMSI). We realized homogeneous horizontal single‐walled carbon nanotube (SWNT) arrays with a highest density of 110 tubes μm⁻¹ on an entire 10×10 mm² magnesium‐modified s...

In‐situ growth of high‐density single‐walled carbon nanotube (SWNT) arrays with homogeneity is highly desirable for integrated circuits. However, disastrous migration and aggregation of catalyst nanoparticles on substrate has greatly limited the area of as‐grown SWNT arrays. Herein, we develop a magnesium‐assisted catalyst anchoring strategy to res...

Two-dimensional (2D) graphdiyne (GDY) is a promising floating-gate material for flexible optoelectronic flash memory owing to its fascinating electrical and optical properties. However, research in GDY-based flash memory is still in its infancy owing to the huge challenge in the synthesis of large-area and ultrathin GDY films with high quality and...

Single-walled carbon nanotubes (SWNTs) emerge as a promising material to advance carbon nanoelectronics. However, synthesizing or assembling pure metallic/semiconducting SWNTs required for interconnects/integrated circuits, respectively, by a conventional chemical vapor deposition method or by an assembly technique remains challenging. Recent studi...

Grain boundaries (GBs) are significant microstructures that dominate properties of polycrystalline two-dimensional (2D) materials. Low-symmetry rhenium disulfide monolayers provide an ideal platform to investigate diverse configurations of GBs and their orientation-dependent characteristics. Here, we utilize the preferential deposition of platinum-...

Carbon nanotubes (CNTs)—especially single-walled CNTs—are promising for device applications. Although CNTs have excellent intrinsic properties, their diverse band structures bring difficulties to improving the performances of CNT-based devices. Therefore, band engineering is necessary. For diverse electrical properties, selective enrichment of CNTs...

When excited by circularly polarized light, the Raman scattered light may have the same or opposite helicity as the incident light determined by the helicity selection rule. For two‐dimensional (2D) transition metal dichalcogonides (TMDCs), the helicity selection rule can be broken down due to the strong Fröhlich exciton–phonon interaction. However...

With the rapidly increasing power density and integration level in electronic devices, the development of the next generation of thermal interface materials (TIMs) with substantially high thermal conductivity is essential for various device technologies. Graphene, exhibiting ultrahigh in‐plane thermal conductivity, is investigated intensely for imp...

Recently, various synthetic methods have been developed to synthesize graphdiyne (GDY) in the aspect of controlled layer and different morphologies. The ideal GDY should have a large crystal domain size with only one atomic layer and possess excellent mechanical, electronic, optical, and magnetic intrinsic properties. However, there is still a gap...

Graphdiyne (GDY), an emerging type of carbon allotropes, possesses fascinating electrical, chemical, and mechanical properties to readily spark energy applications in the realm of Li‐ion and Na‐ion batteries. Nevertheless, rational design of GDY architectures targeting advanced K‐ion storage has rarely been reported to date. Herein, the first examp...

Mixed dimensional van der Waals (vdW) heterostructures constructed by one-dimensional (1D) and two-dimensional (2D) materials exhibit extra degree of freedom to modulate the electronic and optical properties due to the combination of different dimensionalities. The charge transfer at the interface between 1D and 2D materials plays a crucial role in...

Graphdiyne (GDY), a 2D carbon allotrope, is predicted to possess high carrier mobility and an intrinsic bandgap. However, the controlled synthesis of mono‐ or few‐layer GDY with good crystallinity remains challenging because of the instability of the monomers. Herein, a rapid and catalyst‐free synthetic method is presented for few‐layer GDY involvi...

Recently in Nature Materials, the Fu group reported a sphere diameter engineering (SDE) strategy for modulating the band gap of monolayer MoS2, which exhibited high precision, reliability, uniformity, and flexibility with a tuning range of 360 meV. This work provides new ideas for engineering two-dimensional materials, commonly regarded as flatland...

Controlled synthesis of single‐walled carbon nanotubes (SWNTs) is important for further application of carbon nanotubes. SWNT horizontal arrays with specific chirality can be enriched using carbide solid catalysts on substrates. However, it remains a big challenge to increase the production by continuous loading the carbide solid catalysts on subst...

Controlled synthesis of single‐walled carbon nanotubes (SWNTs) is important for further application of carbon nanotubes. SWNT horizontal arrays with specific chirality can be enriched using carbide solid catalysts on substrates. However, it remains a big challenge to increase the production by continuous loading the carbide solid catalysts on subst...

Mixed-dimensional van der Waals (vdW) heterostructures composed of one-dimensional (1D) and two-dimensional (2D) materials have exhibited great potential in nanoelectronics and nano-optoelectronics. In this study, we present a vertical point p-n junction (VPpnJ), in which a vertical stacked molybdenum disulfide (MoS2)/ tungsten diselenide (WSe2) p-...

The growth kinetics play key roles in determining the chirality distribution of the grown single-walled carbon nanotubes (SWCNTs). However, the lack of comprehensive understandings on the SWCNT's growth mechanism at the atomic scale greatly hinders SWCNT chirality-selective synthesis. Here, we establish a general model, where the dislocation theory...