Jian Zhu

Jian Zhu
Nankai University | NKU · School of Materials Science and Engineering

PhD

About

81
Publications
15,000
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5,921
Citations
Additional affiliations
September 2007 - July 2013
University of Michigan
Position
  • PhD Student

Publications

Publications (81)
Article
Flexible and stretchable thin-film transistors (TFTs) are crucial in skin-like electronics for wearable and implantable applications. Such electronics are usually constrained in performance owing to a lack of high-mobility and stretchable semiconducting channels. Tellurium, a rising semiconductor with superior charge carrier mobilities, has been li...
Article
Simulation of biological synaptic function by electronic devices based on two-dimensional (2D) semiconductors is an emerging research. However, large-scale integration of synaptic devices particularly on flexible substrate are challenging. Electrolyte-gated 2D thin film transistors with low temperature processability for large-scale production have...
Article
Full-text available
On‐skin electronics require minimal thicknesses and decent transparency for conformal contact, imperceptible wearing, and visual aesthetics. It is challenging to search for advanced ultrathin dielectrics capable of supporting the active components while maintaining bending softness, easy handling, and wafer‐scale processability. Here, self‐delamina...
Article
Full-text available
Multifunctional electrocatalysts are crucial to cost‐effective electrochemical energy conversion and storage systems requiring mutual enhancement of disparate reactions. Embedding noble metal nanoparticles in 2D metal–organic frameworks (MOFs) are proposed as an effective strategy, however, the hybrids usually suffer from poor electrochemical perfo...
Article
Active sites of two-dimensional (2D) electrocatalysts are often partially blocked owing to their inevitable stacking and hydrophobic polymeric binders in macroscale electrodes, therefore impeding their applications in efficient electrolyzers. Here, using layered double hydroxide (LDH) nanosheets as a model 2D electrocatalyst, we demonstrate that th...
Article
Full-text available
Hydrogen, a clean and flexible energy carrier, can be efficiently produced by electrocatalytic water splitting. To accelerate the sluggish hydrogen evolution reaction and oxygen evolution reaction kinetics in the splitting process, highly active electrocatalysts are essential for lowering the energy barriers, thereby improving the efficiency of ove...
Article
Full-text available
Coordination polymers (CPs) are a class of crystalline solids that are considered brittle, due to the dominance of directional coordination bonding, which limits their utility in flexible electronics and wearable devices. Hence, engineering plasticity into functional CPs is of great importance. Here, we report plastic bending of a semiconducting CP...
Article
Aqueous zinc-ion batteries (ZIBs) have gained wide attention for their low cost, high safety, and environmental friendliness in recent years. β-MnO2, a potential cathode material for ZIBs, has been restricted by its small channels for efficient charge storage. Herein, β-MnO2 nanorods with oxygen vacancies are fabricated by a K+-doping strategy to i...
Article
Full-text available
The wafer-scale fabrication of two-dimensional (2D) semiconductor thin films is the key to the preparation of large-area electronic devices. Although chemical vapor deposition (CVD) solves this problem to a certain extent, complex processes are required to realize the transfer of thin films from the growth substrate to the device substrate, not to...
Chapter
Metal-organic frameworks (MOFs) as one of the potential functional materials have drawn much attention in energy storage and conversion fields due to their inverse structures, high surface area, strong designability, and high modifiability. In particular, MOF-based electrolytes can serve as the medium for ion transport and control the rate of batte...
Article
Rechargeable aqueous zinc-ion batteries (ZIBs) featuring low cost, superior performance, and environmental benignity have attracted dramatic attention as a promising alternative energy storage system to lithium-ion batteries. Nevertheless, the development of ZIBs is still hindered by the limited selection of cathode materials due to the large solva...
Article
Full-text available
Understanding the effect of short channels on the performance of field‐effect transistors (FETs) from emerging low‐dimensional semiconductors is crucial to estimate their suitability in high‐density integrated circuits. To this end, intricate and costly equipment capable of nanoscale photolithography or e‐beam lithography is usually required to fab...
Article
Full-text available
Elastomeric dielectrics are crucial for reliably governing the carrier densities in semiconducting channels during deformation in soft/stretchable field‐effect transistors (FETs). Uncontrolled stacking of polymeric chains renders elastomeric dielectrics poorly insulated at nanoscale thicknesses, thereby thick films are usually required, leading to...
Article
Carboxylic acid-based metal-organic frameworks (MOFs) are normally passed for the “pre-catalysts” for oxygen evolution reaction (OER) due to the hydroxides constructed in-situ during its alkaline hydrolysis process (AHP) in lye. Whereas, it remains a mystery that they show advantageous activity over prototypical hydroxides when they are directly ac...
Article
Creating an insulation material combining crack and delamination resistance, mechanical flexibility, strong adhesion, and biocompatibility is vital for implantable bioelectronic devices of all types. Here, we describe a nanocomposite material addressing these technological challenges that have been designed using blueprints from biomaterials that c...
Article
Earth-abundant magnetite (Fe3O4) as cathode materials in aqueous zinc-ion batteries (ZIBs) is limited by its very low capacity and poor cycling. Here, a combined strategy based on carbon coating and electrolyte optimization is adopted to improve the performance of Fe3O4. The Zn-Fe3O4@C batteries display specific capacities of 93 mAh g⁻¹ and 81% cap...
Article
Recently discovered bismuth oxychalcogenide (Bi2O2Se) has aroused great interest due to its ultrahigh carrier mobility, tunable band gap and good environmental stability, making it a promising candidate for high-performance electronics and optoelectronics. Their synthesis by colloidal approaches represents a cost-effective alternative to well-estab...
Article
Full-text available
As a burgeoning family of crystalline porous copolymers, covalent organic frameworks (COFs) allow precise atomic insertion of organic components in the topology construction to form periodic networks and ordered nanopores. Their 2D networks bear great similarities to graphene analogs, and therefore are essential additions to the 2D family. Here, th...
Preprint
An insulation material combining crack and delamination resistance, flexibility, strong adhesion, and biocompatibility is vital for implantable bioelectronic devices of all types. Creating a material with the combination of all these properties is a particularly distinct challenge for implantable electrodes. Here we describe a nanocomposite materia...
Article
Fabrication of large-area and uniform semiconducting thin films of two-dimensional (2D) materials is paramount for the full exploitation of their atomic thicknesses and smooth surfaces in integrated circuits. In addition to elaborate vapor-based synthesis techniques for the wafer-scale growth of 2D films, solution-based approaches for high-quality...
Article
Full-text available
Stretchable conductors capable of precise micropatterning are imperative for applications in various wearable technologies. Metallic nanoparticles with low aspect ratios and miniscule sizes are preferred over metallic nanowires or nanoflakes for such applications. However, nanoparticles tend to lose mutual contact during stretching. Therefore, they...
Article
Stretchable conductors are important ingredients in the new emerging wearable systems. Here, intrinsically stretchable con­ductors (ISCs) based on carbon nanomaterials with a good balance of properties are prepared through synergistic combination of graphene and carbon black (CB) into the matrices of thermoplastic polyurethane (TPU). The inks are p...
Article
Full-text available
Nanoadditive manufacturing, a promising solution‐based technique for the precise control of electronic film growth and device fabrication, is summarized by Jian Zhu and co‐workers in article number 1806480. The focus is particularly on the approaches of Langmuir–Blodgett assembly and layer‐by‐layer assembly, with a summary of manufactured thin‐film...
Article
Full-text available
Controlled growth of metal–organic frameworks (MOFs) nanocrystals on requisite surfaces is highly desired for myriad applications related to catalysis, energy, and electronics. Here, this challenge is addressed by overlaying arbitrary surfaces with a thermally evaporated metal layer to enable the well‐aligned growth of ultralong quasi‐2D MOF nanoar...
Article
Full-text available
Developing active, stable, and cost‐effective water splitting catalysts is a critical step towards a sustainable energy future. Heterostructures of transition metal chalcogenides have emerged as important candidates for catalyzing oxygen evolution reaction (OER) or hydrogen evolution reaction (HER), due to the synergistic effects originating from t...
Article
Two-dimensional (2D) semiconductors have aroused tremendous interest due to their potential to revolutionize electronics industry and illustrate fundamental quantum physics related to electronics and optics. Any practical applications of 2D semiconductors rely on the production of high-quality 2D materials on a wafer scale. Solution-processed appro...
Article
Full-text available
Soft electronics that can simultaneously offer electronic functions and the capability to be deformed into arbitrary shapes are becoming increasingly important for wearable and bio-implanted applications. The past decade has witnessed tremendous progress in this field with a myriad of achievements in the preparation of soft electronic conductors, s...
Article
Full-text available
Most electronics consist of functional thin films with tens of nanometer thicknesses. It is usually challenging to control the growth of these thin films using conventional solution‐based approaches. Nanoadditive manufacturing, a method to deposit electronically desired molecules, polymers, or nanomaterials in a layer‐by‐layer (LbL) fashion, has em...
Article
Solution-processed two-dimensional materials offer a scalable route towards next-generation printed devices. In this report, we demonstrate fully inkjet-printed photodetectors using molybdenum disulfide (MoS2) nanosheets as the active material and graphene as the electrodes. Percolating films of semiconducting MoS2 with high electrical conductivity...
Article
Full-text available
In article number 1804058, Xian‐He Bu and co‐workers prepare flexible FexOy/nitrogen‐doped carbon (FexOy/NC‐MOG) electrode by facile electrospinning of Fe‐based metal–organic gels (MOGs) followed by high‐temperature carbonization. The tiny FexOy active sites are dispersed in nitrogen‐doped carbon substrates due to the homogeneous distribution of Fe...
Article
Aiming at the exploration of luminescent coordination polymer (LCP) systems for highly tunable luminophores, a new series of Cd(II) LCPs, namely [Cd2(tpt)2(CBA)2(H2O)2]·(PAH) (1), [Cd2(tpt)2(CBA)2]·(PAHs) (2–3) (tpt = 2,4,6-tri(pyridin-4-yl)-1,3,5-triazine, H2CBA = 4-(carboxymethyl) benzoic acid, PAHs = polycyclic aromatic hydrocarbons, coronene fo...
Article
Full-text available
The development of cost‐effective and flexible electrodes is demanding in the field of energy storage. Herein, flexible FexOy/nitrogen‐doped carbon films (FexOy/NC‐MOG) are prepared by facile electrospinning of Fe‐based metal–organic gels (MOGs) followed by high‐temperature carbonization. This approach allows the even mixing of fragile coordination...
Article
3D printing of functional inorganic nanowire has been accomplished with extruded nanowire-based inks obtained by incorporating nanofiller into polymeric matrics or thickeners. However, the presence of inactive additive poses critical challenge for fully realizing the functionality of the nanowires in the printed structures, which remains a fundamen...
Article
Organic donor–acceptor systems have attracted much attention due to their various potential applications. However, the rational construction and modulation of highly ordered donor–acceptor systems could be a challenge due to the complicated self‐assembly process of donor and acceptor species. Considering the well‐defined arrangement of species at t...
Article
Layer-by-layer (LBL) assembly produces nanocomposites with distinctively high volume fractions of nanomaterials and nanometer scale controlled uniformity. Although deposition of one nanometer scale layer at a time leads to high performance composites, this deposition mode is also associated with the slow multilayer build-up. Exponential LBL, spin c...
Article
Coordination polymers (CPs, including metal–organic frameworks, MOFs) have become an active topic in chemical and materials science. The construction of CPs depends heavily on the organic ligands as well as the metal centers, and the versatility of ligands contributes to the structural and property diversities of CPs. Here, the structural diversity...
Article
Full-text available
Viscoelastic properties are central for gels and other materials. Simultaneously, high storage and loss moduli are difficult to attain due to their contrarian requirements to chemical structure. Biomimetic inorganic nanoparticles offer a promising toolbox for multiscale engineering of gel mechanics, but a conceptual framework for their molecular, n...
Article
Interconnectivity of molecular or nanoscale components in three-dimensional networks (3DNs) is essential for stress transfer in hydrogels, aerogels, and composites. Entanglement of nanoscale components in the network relies on weak short-range intermolecular interactions. The intrinsic stiffness and rod-like geometry of known nanofibers limits the...
Article
Interconnectivity of molecular or nanoscale components in three-dimensional networks (3DNs) is essential for stress transfer in hydrogels, aerogels, and composites. Entanglement of nanoscale components in the network relies on weak short-range intermolecular interactions. The intrinsic stiffness and rod-like geometry of known nanofibers limits the...
Article
Recent developments in liquid-phase processing of carbon nanomaterials have established graphene as a promising candidate for printed electronics. Of great importance in the ink formulation is the stabilizer, which has to provide excellent dispersion stability and tunability in the liquid state, and also decompose into chemical moieties that promot...
Article
Artificial solids and thin films assembled from colloidal nanomaterials give rise to versatile properties that can be exploited in a range of technologies. In particular, solution-based processes allow for the large-scale and low-cost production of nanoelectronics on rigid or mechanically flexible substrates. To achieve this goal, several processin...
Article
Nanopatterning and layer-by-layer thinning of black phosphorus is demonstrated with conductive atomic-force-microscope anodic oxidation. The liquid-phase patterning byproduct is readily removed by water rinsing. An alternating current bias enables direct nanopatterning and thinning on insulating substrates such as SiO2 /Si. Field-effect transistors...
Article
Solid-state supercapacitors and micro­supercapacitors are fabricated from a pristine graphene ink by solution casting and inkjet printing. The devices exhibit high performance, with a volumetric device capacitance up to 17.8 F cm⁻³. With a simple fabrication process and robust tolerance to mechanical deformation, this work represents a promising te...
Article
Full-text available
Polymeric nanomaterials emerge as key building blocks for engineering materials in a variety of applications. In particular, the high modulus polymeric nanofibers are suitable to prepare flexible yet strong membrane separators to prevent the growth and penetration of lithium dendrites for safe and reliable high energy lithium metal-based batteries....
Preprint
Understanding and exploiting the remarkable optical and electronic properties of phosphorene require mass production methods that avoid chemical degradation. While solution-based strategies have been developed for scalable exfoliation of black phosphorus, these techniques have thus far employed anhydrous organic solvents in an effort to minimize ex...
Article
Significance Few-layered phosphorene, which is isolated through exfoliation from black phosphorus, has attracted great interest due to its unique electronic and optical properties. Although solution-based exfoliation methods have been developed for black phosphorus, these techniques have thus far used anhydrous organic solvents. This approach minim...
Article
Chiroptical materials found in butterflies, beetles, and other creatures are attributed to biocomposites with helical motifs and multiscale hierarchical organization. These structurally sophisticated materials self-assemble from primitive nanoscale building blocks - a process that is simpler and more energy efficient than many top-down methods curr...
Article
Layer-by-layer assembled 2D montmorillonite nanosheets are employed by M. C. Hersam and co-workers for high-performance, solution-processed dielectric thin films, as described on page 63. These spatially uniform sub-10-nm-thick dielectrics possess high areal capacitances and low leakage currents that enable low-voltage operation of complementary so...
Article
Gate dielectrics directly affect the mobility, hysteresis, power consumption, and other critical device metrics in high-performance nanoelectronics. With atomically flat and dangling bond-free surfaces, hexagonal boron nitride (h-BN) has emerged as an ideal dielectric for graphene and related two-dimensional semiconductors. While high-quality, atom...
Article
Over the past two decades, extensive research on single-walled carbon nanotubes (SWCNTs) has elucidated their many extraordinary properties, making them one of the most promising candidates for solution-processable, high-performance integrated circuits. In particular, advances in the enrichment of high-purity semiconducting SWCNTs have enabled rece...
Article
Chiral nanostructures exhibit strong coupling to the spin angular momentum of incident photons. The integration of metal nanostructures with semiconductor nanoparticles (NPs) to form hybrid plasmon-exciton nanoscale assemblies can potentially lead to plasmon-induced optical activity and unusual chiroptical properties of plasmon-exciton states. Here...
Article
Nature provides a vast array of solid materials that repeatedly and reversibly transform in shape in response to environmental variations. This property is essential, for example, for new energy-saving technologies, efficient collection of solar radiation, and thermal management. Here we report a similar shape-morphing mechanism using differential...
Conference Paper
Stretchable conductors are essential components of next generation electronic devices that can facilitate integration of human-machine interfaces. Despite the fundamental difficulties of combining stretchability and conductivity tremendous research and development efforts have been put into exploring possibilities envisioned from nanoscale building...
Article
Research in stretchable conductors is fuelled by diverse technological needs. Flexible electronics, neuroprosthetic and cardiostimulating implants, soft robotics and other curvilinear systems require materials with high conductivity over a tensile strain of 100 per cent (refs 1, 2, 3). Furthermore, implantable devices or stretchable displays need m...
Article
Materials assembled by layer-by-layer (LBL) assembly and vacuum assisted flocculation (VAF) have similarities but a systematic study of their comparative advantages and disadvantages is missing. Such a study is needed from both practical and fundamental perspectives aiming at better understanding of structure-property relations of nanocomposites an...
Article
Unraveling the complex interplay between thermal properties and hydration is a part of understanding the fundamental properties of many soft materials and very essential for many applications. Here we show that graphene oxide (GO) demonstrates a highly negative thermal expansion (NTE) coefficient owing to unique thermohydration processes related wi...
Article
Treatments of neurological diseases, diagnostics of brain malfunctions, and the realization of brain-computer interfaces require ultrasmall electrodes that are "invisible" to resident immune cells. Functional electrodes smaller than 50 μm are impossible to produce with traditional materials due to high interfacial impedance at the characteristic fr...
Conference Paper
Stable dispersions of nanofibers are virtually unknown for synthetic polymers. They can compliment analogous dispersions of inorganic components, such as nanoparticles, nanowires, nanosheets, etc as a fundamental component of a toolset for design of nanostructures and metamaterials via numerous solvent-based processing methods. As such, strong flex...
Article
Stable dispersions of nanofibers are virtually unknown for synthetic polymers. They can complement analogous dispersions of inorganic components, such as nanoparticles, nanowires, nanosheets, etc. as a fundamental component of a toolset for design of nanostructures and metamaterials via numerous solvent-based processing methods. As such, strong fle...
Article
Detailed understanding of the mechanism of dielectrophoresis (DEP) and the drastic improvement of its efficiency for small size-quantized nanoparticles (NPs) open the door for the convergence of microscale and nanoscale technologies. It is hindered, however, by the severe reduction of DEP force in particles with volumes below a few hundred cubic na...
Article
Single-walled carbon nanotube (SWNT) and other carbon-based coatings are being considered as replacements for indium tin oxide (ITO). The problems of transparent conductors (TCs) coatings from SWNT and similar materials include poor mechanical properties, high roughness, low temperature resilience, and fast loss of conductivity. The simultaneous re...
Article
We present a conformal and lightweight antenna technology based on E-textile conductors and polymer-ceramic composites. Unique advantages of the proposed technology are its structural integrity, light weight and conformity to the platform. E-textile conductors are fabricated with single wall carbon nanotube (SWNT) and Ag coated textiles. They demon...
Article
The inevitable contact of substrates with water during the traditional practice of layer-by-layer assembly (LBL) creates problems for multiple potential applications of LBL films in electronics. To resolve this issue, we demonstrate here the possibility of a LBL process using ionic liquids (ILs), which potentially eliminates corrosion and hydration...
Article
New transparent conductors (TCs) capable of replacing traditional indium tin oxide (ITO) are much needed for displays, sensors, solar cells, smart energy-saving windows, and flexible electronics. Technical requirements of TCs include not only high electrical conductivity and transparency but also environmental stability and mechanical property whic...
Conference Paper
Layer-by-layer (LBL) deposition of carbon nanotubes (CNTs) over fibers that are also reinforced with CNTs has been performed and shows promise for a scalable process for making conductive organic filaments. Descriptions of the fabrication of polymer filaments and LBL-deposition methods will be provided along with some results and examples of possib...
Conference Paper
Layer-by-layer (LBL) assembly advancement has recently been used for the fabrication of multilayer polymer films whose thicknesses increase exponentially. The exponential films provide the ability for loading of active molecules after the preparation of LBL polymer films. The significance of finding a unique approach to reversibly load-and-unload C...
Conference Paper
Single Walled Carbon Nanotube (SWNT) has aroused lots of interest due to its exceptional mechanical, electrical or thermal properties. Attempts to incorporate them into composites have always impeded by the bundling and entanglements between individual SWNTs. We developed here a method to efficiently disperse SWNTs in aqueous solutions by Sulfonate...
Article
Exponentially growing layer-by-layer (e-LBL) assembled films attracts a lot of attention mostly due to multiple practical applications in biology and medicine. However, e-LBL was observed only for a very limited number of polymers. This fact inevitably limits the area of research and functionalities that one can obtain for them. Also, it is fundame...
Article
Multilayered thin films prepared with the layer-by-layer (LBL) assembly technique are typically "brittle" composites, while many applications such as flexible electronics or biomedical devices would greatly benefit from ductile, and tough nanostructured coatings. Here we present the preparation of highly ductile multilayered films via LBL assembly...
Article
Efficient coupling of mechanical properties of SWNTs with the matrix leading to the transfer of unique mechanical properties of SWNTs to the macroscopic composites is a tremendous challenge of today's materials science. The typical mechanical properties of known SWNT composites, such as strength, stiffness, and toughness, are assessed in an introdu...
Conference Paper
Thin Conductive transparent films (TCFs) play an essential role in many optoelectonic devices, including Touch Screens, Liquid Crystal Displays (LCDs), Organic Light-Emitting Diodes (OLEDs), and Photovoltaics (PV) as electrodes. Indium Tin Oxide (ITO) was selected as an appropriate candidate for this application long ago in industry, due to its low...

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