Peng Liu

Peng Liu
King Abdullah University of Science and Technology | KAUST · Division of Biological and Environmental Sciences and Engineering (BESE)

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198
Publications
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Introduction
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Publications

Publications (198)
Article
Ideal titanium implants are required to participate in bone repair actively to improve in situ osteointegration. However, the traditional surface functionalization methods of titanium implants are difficult to both achieve the active regulation and long-term stability of bioactive components. Here, a novel functionalized titanium which loaded with...
Article
Observing the morphology of insulating specimen in scanning electron microscope (SEM) is of great significance for the nanoscale semiconductor devices and biological tissues. However, the charging effect will cause image distortion and abnormal contrast when observing insulating specimen in SEM. A typical solution to this problem is using metal coa...
Article
Full-text available
Insufficient osseointegration and biofilm-associated bacterial infection are important challenges for clinical application of titanium (Ti)-based implants. Here, we constructed mesoporous polydopamine (MPDA) nanoparticles (NPs) loaded with luteolin (LUT, a quorum sensing inhibitor), which were further coated with the shell of calcium phosphate (CaP...
Article
In recent years, magnesium alloys (MgA) have been reckoned as the most promising material of biomedical importance on account of its excellent degradable properties and mechanical properties mimicking natural bone tissues. However, MgA are prone to rapid corrosion under physiological conditions, causing toxicity around the neighboring tissues. In a...
Article
Recently, photothermal therapy (PTT) has been recognized as a viable alternative strategy against bacterial biofilm infection. However, the hyperthermia required for PTT to ablate a biofilm usually induces damage in normal tissues/organs nearby. Herein, we developed zeolite-based imidazole framework (ZIF-8)-coated mesoporous polydopamine (MPDA) cor...
Article
The development of wound dressings combined with both efficient antibacterial activities and pro-healing functions has always been an intractable medical task for treating bacterial wound infection. Herein, we developed a novel hybrid hydrogel dressing loaded with two- dimensional polydopamine nanosheets (PDA NS) and the nitric oxide donor (BNN6) f...
Article
A double acid corrosion and subsequent hydrothermal treatment were used to fabricate a micro–nano-structured Ti substrates (Ti–M–N). Afterward, the mesoporous polydopamine (MPDA) nanoparticles as photothermal agent were prepared and immobilized on the surface of Ti–M–N samples, in order to obtain Ti–M–N-MPDA sample. Unique micro–nanostructure prope...
Article
Reducing bacterial infection and improving osseointegration are critical for the long-term use of orthopedic implants, especially for the infection related surgery. Here, mesoporous dopamine (MPDA) nanoparticles were loaded with nitric oxide (NO) donor, S-nitrosoglutathione (GSNO), and they were immobilized on the surface of titanium (Ti). When bac...
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Full-text available
Cross-linked polyethylene glycol-based resin (c-PEGR) is constructed by a ring-opening reaction of polyethylene glycol diglycidyl ether (PEGDE) with epoxy groups and polyether amine (PEA) with amino groups. By confining the hydroxyl groups with inferior oxidative stability to the c-PEGR backbone, the oxidation potential of the PEG-based polymer mat...
Article
Titanium (Ti) and titanium alloys have become widely used as biomedical materials in orthopedics because of their good machinability, corrosion resistance, low elastic modulus and excellent biocompatibility. However, when Ti-based implants are used for bone repair and replacement, they are easy to cause bacteria adhesion and aggregation, which lead...
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The torsion balance, consisting of a rigid balance beam suspended by a fine thread, is an ancient scientific instrument, yet it is still a very sensitive force sensor to date. As the force sensitivity is proportional to the lengths of the beam and thread, but inversely proportional to the fourth power of the diameter of the thread, nanomaterials sh...
Article
The carbon nanotube (CNT) is a compelling and promising material for industrial applications requiring high strength and rigidity. For a multi-walled CNT (MWCNT), the nominal tensile strength and Young's modulus (considering the whole cross-sectional area of the specimen) are key mechanical factors for the practical application of macroscopic fiber...
Article
By using superaligned carbon nanotube (SACNT) macrostructures as reinforcements, the one-step homoepitaxial growth of SACNT/graphite composites was achieved with a home-built experimental setup at temperatures as high as 2600 °C. Compared with traditional furnace heating method, this approach offers the advantages of increased convenience, high thr...
Article
Actively tunable acoustic metamaterials have attracted ever increasing attention. However, their tunable frequency range is quite narrow (tens of Hz) even under ultrahigh applied voltage (about 1,000 V). Here, we report a superbroad-band actively tunable acoustic metamaterials with the bandwidth over 400 Hz under a low voltage. In the actively tuna...
Article
The main task for medical-used titanium researches is to improve the in vivo osteointegration. In addition to mesenchymal stromal cells (MSCs)-osteoblasts lineage, macrophages also undertake irreplaceable roles in the osteointegration process of a titanium implant. The timely recruitment and efficient immunomodulation of macrophages is important. I...
Article
The high‐temperature transport properties of individual carbon nanotubes (CNTs) with a specified chiral index have been studied by Peng Liu, Kaili Jiang, and co‐workers in article number 2000103. Experimental results show that the resistivity increases with temperature T monotonically, the carrier concentration exponentially increases with 1/T, and...
Article
Carbon Nanotubes In article number 2000069, Peng Liu, Kaili Jiang, and co‐workers study the thermionic emission of individual carbon nanotubes with specified chiral index by selected area electron diffraction in transmission electron microscopy. Different from the traditional macroscopic materials, it is found that the emission of carbon nanotubes...
Article
We have studied the transmission of carbon nanotube film with ultrathin oxide coatings in the visible light range. It is found that the transmission is improved after coating. This is mainly due to Rayleigh scattering induced by the ultrathin oxide coatings. The improvement of the visible light transmission has important applications for a mobile p...
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Two-dimensional (2D) heterostructures based on the combination of transition metal dichalcogenides (TMDs) and transition metal oxides (TMOs) have aroused growing attention due to their integrated merits of both components and multiple functionalities. However, nondestructive approaches of constructing TMD-TMO heterostructures are still very limited...
Article
We studied high temperature thermionic electron emission from different types of individual suspended carbon nanotubes (CNTs) in a home‐made chip. When collecting emission electrons with an external electrode, we found that the collecting electric field influence the transport current in the CNTs, and the thermionic electron emission deviated from...
Article
The transport property of six individual carbon nanotube (CNT) with specified chiral index at high temperature was investigated on a home‐made apparatus. It was found that the resistivity of all individual CNTs increases with temperature monotonically, while the mobility decreases with temperature, and follows different laws at different temperatur...
Article
The inherent biological inertness of Ti substrates is a general challenge in orthopedic and dental clinical application. In this study, the strontium-containing phase change lysozyme coating was prepared on titanium via a supramolecular self-assembly method for accelerating osseointegration. Successful preparation of the Sr-incorporated lysozyme na...
Article
Photothermal treatment (PTT) involving combination therapeutic modalities were recently emerged as an efficient alternative for combating biofilm. However, PTT-related local high temperature may destroy the surrounding healthy tissues. Herein, we present an all-in-one photo-therapeutic nanoplatform consisting of L-arginine (L-Arg), indocyanine gree...
Article
Biomaterials-associated bacterial infection is one of the major causes of implant failure. The treatment of such an implant infection typically requires the elimination of bacteria and accelerating tissue regeneration around implants simultaneously. To address this issue, an ideal implanted material should have the dual functions of bacterial infec...
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Full-text available
Magnesium alloy (MgA) has been extensively used as orthopedic and cardiovascular scaffolds in virtue of its good biocompatibility, unique biodegradability and excellent mechanical properties. However, poor corrosion resistance and easy infection after implantation seriously limit the potential applications of MgA in the biomedical field. Herein, we...
Article
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Background: While the role of Polycomb group protein-mediated “cell memory” is well established in developmen- tal contexts, little is known about their role in adult tissues and in particular in post-mitotic cells. Emerging evidence assigns a pivotal role in cell plasticity and adaptation. PRC2-Ezh1α/β signaling pathway from cytoplasm to chromatin...
Article
In this study, vancomycin (Van)-loaded sodium alginate (SA) hydrogel coating was fabricated on micro-arc oxidation (MAO)-treated magnesium alloy (MgA) surface via the electrostatic interaction between polyethyleneimine and SA to enhance anticorrosion, hemocompatibility, and antibacterial properties of MgA substrate. The surface morphology and chemi...
Article
Biofilm formation is a main challenge in treatment of bone-implant-associated infections, resulting in tolerance to immune system and antibiotics. However, smart non-surgical or non-invasive treatment methods of combating established biofilm on an implant have been less reported. Herein, a therapeutic system consisting of mesoporous polydopamine na...
Article
Polymer materials with high biocompatibility and versatile functions are urgently required in biomedical field. The hydrophobic surface and inert traits of polymer materials usually encounter the severe biofouling and bacterial infection that hinder the potential application of polymers as biomedical materials. Although plentiful of antifouling or...
Article
In extreme environments, such as at ultra-high or ultra-low temperatures, the amount of tape used should be minimal so as to reduce system contamination and unwanted residues. However, tapes made from conventional materials typically lose their adhesiveness or leave residues difficult to remove under such conditions. Thus, the development of more v...
Article
The development of wires and cables that can tolerate extremely high temperatures will be very important for probing extreme environments, such as in solar exploration, fire disasters, high-temperature materials processing, aeronautics and astronautics. In this paper, a lightweight I high-temperature coaxial h-boron nitride (BN)/carbon nanotube (CN...
Article
To inhibit bacterial infection in situ and improve osseointegration are essentially important for long-term survival of an orthopedic implant, in particular for infection-associating revision surgery. Herein, we fabricate a functional molybdenum disulfide (MoS2)/polydopamine (PDA)-arginine-glycine-aspartic acid (RGD) coating on titanium (Ti) implan...
Article
Full-text available
Magnesium alloy (MgA) was widely used in biomedical field owing to its good biocompatibility and degradability. The surface of MgA was usually modified to improve its corrosion resistance, biocompatibility, and biological properties. Herein, we employed a layer-by-layer assembly technique to assemble both polyanionic and polycationic electrolytes o...
Article
Sclerostin is a negative regulator of the Wnt signaling pathway for osteoblast differentiation. In this study, osteoblasts were co-cultured with osteocytes (MLO-Y4 cells) on the surface of sclerostin antibody-conjugated TiO2 nanotube arrays (TNTs-scl). Field emission scanning electron microscopy (SEM), contact angle measurement and confocal laser s...
Article
Preventing bacterial infection and improving osseointegration of titanium (Ti) and its alloys are both highly crucial factors for their long-term successful implantation in clinic applications. However, the straightforward applications of antibacterial surfaces on Ti-based materials remain limited owing to their side effects on cytocompatibility. H...
Article
Full-text available
In this study, a type of bacteria enzyme-triggered antibacterial surface with a controlled release of Ag ions was developed. Firstly, chitosan-silver nanocomposites (Chi@Ag NPs) were in situ synthesized via using ascorbic acid as reducing agent. Chi@Ag NPs were characterized by transmission electron microscopy, ultraviolet–visible spectroscopy, X-r...
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Full-text available
We have studied the effects of adsorbates on the field emission (FE) properties of graphene edges at different temperatures using Joule heating. Using infrared imaging and spectral fitting, the temperature from room temperature to about 1000 K was measured accurately. It was found that adsorption induces the deviation of graphene edge field emissio...
Article
Maintaining the balance between bone formation and bone resorption as well as reducing bacterial infection are two major challenges for titanium (Ti) when it is used as the implant in orthopedic surgery. Because of its excellent properties, including anti-inflammatory, antimicrobial, promoting osteoblasts, and inhibiting osteoclasts growth, lactofe...
Article
Full-text available
Two-dimensional (2D) materials and their heterostructures, with wafer-scale synthesis methods and fascinating properties, have attracted significant interest and triggered revolutions in corresponding device applications. However, facile methods to realize accurate, intelligent, and large-area characterizations of these 2D nanostructures are still...
Article
Polyimide (PI) is a high-performance polymer with ultrahigh heat stability while carbon nanotube (CNT) possesses high mechanical strength, excellent electrical and thermal conductivity. Here we report a facile and low-cost method free from CNT pre-dispersion for fabricating super-aligned carbon nanotube (SACNT)/PI composite film which combines the...
Article
In orthopedic fields, effective anti-infection property and promotive biocompatibility on surface of titanium implants are two crucial factors for long-term successful implants. Herein, Ag nanoparticles (NPs) loaded TiO2 nanotubes (TNT) arrays were fabricated on Ti substrates with assistance of ultraviolet irradiation. Then, bioactive multilayer fi...
Article
With the super aligned carbon nanotube (SACNT) film, we have fabricated crystalline multiwall CNT (MWCNT) by adopting a high pressure and high temperature processing. The CNTs keep parallel to each other and distributed uniformly. XRD characterization shows peaks at small angle range, which can be assigned to the spacing of MWCNT crystal. The mecha...
Preprint
Full-text available
Two-dimensional (2D) materials and their heterostructures, with wafer-scale synthesis methods and fascinating properties, have attracted numerous interest and triggered revolutions of corresponding device applications. However, facile methods to realize accurate, intelligent and large-area characterizations of these 2D structures are still highly d...
Article
Effective and fast osseointegration are important for the survivals of titanium based orthopaedic impalnts. Previous studies confirmed that topographic features combining with inorganic ions had positive effects on biological functions of osteoblastic cells. In this study, we report an approach for fabricating Fe-incorporated micro-nano hierarchica...
Article
Full-text available
Two-dimensional (2D) materials have attracted interest because of their excellent properties and potential applications. A key step in realizing industrial applications is to synthesize wafer-scale single-crystal samples. Until now, single-crystal samples, such as graphene domains up to the centimeter scale, have been synthesized. However, a new ch...
Article
Aligned carbon nanotube (CNT) arrays are promising candidates for strain sensors owing to their scalable preparation and excellent conductivity and stretchability. However, aligned CNT arrays are limited by low strain sensitivity and buckling deformation. In addition, cross-stacked CNT array films layer-by-layer assembled on soft substrates exhibit...
Article
Full-text available
Van der Waals (vdW) heterostructures have received intense attention for their efficient stacking methodology with 2D nanomaterials in vertical dimension. However, it is still a challenge to scale down the lateral size of vdW heterostructures to the nanometer and make proper contacts to achieve optimized performances. Here, a carbon-nanotube-confin...
Article
The insufficient osseointegration and bacterial infection of titanium and its alloys remain the key challenges in their clinic applications, which may result in failure implantation. To improve osteogenetic and antibacterial properties, TiO2 nanotube arrays were fabricated on titanium substrates for loading of antibacterial drug. Then, TiO2 nanotub...
Article
In this study, micropatterns on polypropylene films were fabricated via plasma pretreatment and UV-initiated graft polymerization. Firstly, radio-frequency plasma, which does not significantly influence bulk attributes of substrates due to limited penetration depth, was utilized to activate polypropylene films. Then, different sizes of micropattern...
Article
Owing to the distinctively morphological and structural features, vertically-aligned graphene nanosheets (VGs) possess many unique properties and hold great promise for applications in various fields. For controllable preparation and wide application of VGs, the establishing reliable growth method and profound understanding of the growth mechanism...
Article
Scanning electron microscopy (SEM) plays an indispensable role in nanoscience and nanotechnology because of its high efficiency and high spatial resolution in characterizing nanomaterials. Recent progress indicates that the contrast arising from different conductivities or bandgaps can be observed in SEM images if single-walled carbon nanotubes (SW...
Article
Single-walled carbon nanotube (SWCNT) films with a high density exhibit broad functionality and great potential in nanodevices, as SWCNTs can be either metallic or semiconducting in behavior. The films greatly benefit from characterization technologies that can efficiently identify and group SWCNTs based on metallic or semiconducting natures with h...
Article
A vertical point heterostructure (VPH) is constructed by sandwiching a two-dimensional (2D) MoS2 flake with two cross-stacked metallic single-walled carbon nanotubes. It can be used as a field effect transistor with high on/off ratio and a light detector with high spatial resolution. Moreover, the hybrid 1D-2D-1D VPHs open up new possibilities for...
Article
In this study, a simple one-step co-deposition process was introduced to fabricate antibacterial surfaces for synthetic materials via UV-inducing dopamine polymerization combined with in situ formation of Ag nanoparticles. The successful formation of a composite coating was demonstrated by scanning electron microscopy. Antibacterial experiments inc...
Article
Full-text available
Carbon nanotube (CNT) is believed to be the most promising material for next generation IC industries with the prerequisite of chirality specific growth. For various approaches to controlling the chiral indices of CNTs, the key is to deepen the understanding of the catalytic growth mechanism in chemical vapor deposition (CVD). Here we show our disc...
Article
Anodization is a promising method to change the topography and wettability of titanium (Ti) implant. The formed TiO2 nanotubes (TiNTs) arrays could enhance the biological properties of Ti implants. In this study, to investigate the possibility of TiNTs arrays on a Ti implant surface as nano-reservoirs for small molecular drugs when using in orthope...
Article
Full-text available
To enhance long-term survival of titanium implants in patients with osteoporosis, chitosan/gelatin multilayers containing bone morphogenetic protein 2(BMP2) and an anti-osteoporotic agent of calcitonin (CT) are deposited on the Ti6Al4V (TC4) implants through layer-by-layer (LBL) electrostatic assembly technique. Here, the obtained titanium alloy im...
Article
Functionalization of magnesium alloy (Mg alloy) with multiple bioactivities is desired to obtain surfaces with improved biocompatibility and antibacterial property. In this article, an anticorrosive and antimicrobial coating was prepared on Mg alloy surface by layer-by-layer (LbL) assembly of polyelectrolytes. A polycationic copolymer (P(DOP-co-DMA...
Article
The aprotic Li-O2 battery has attracted a great deal of interest because, theoretically, it can store far more energy than today's batteries. Towards unlocking the energy capabilities of this neotype energy storage system, noble metal-catalyzed high surface area carbon materials have been widely used as the O2 cathodes, and some of them exhibit exc...
Article
To improve corrosion resistance and hemocompatibility of magnesium alloy (Mg alloy), a polymerized 2-methacryloyloxyethyl phosphorycholine (PMPC) coating was fabricated via surface thiol-ene photopolymerization onto Mg alloy treated by cathodic plasma electrolytic deposition (CPED). Surface morphology, chemical composition and phase composition of...
Article
To mimic extracellular microenvironment of endothelial cell, a bioactive multilayered structure of gelatin/chitosan pair, embedding with vascular endothelial growth factor (VEGF), was constructed onto NiTi alloy substrate surface via a layer-by-layer assembly technique. The successful fabrication of the multilayered structure was demonstrated by sc...
Article
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Single-walled carbon nanotubes (SWCNTs) illuminated by white light should appear colored due to resonance Rayleigh scattering. However, true-color imaging of SWCNTs on substrates has not been reported, because of the extremely low scattering intensity of SWCNTs and the strong substrate scattering. Here we show that Rayleigh scattering can be greatl...
Article
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Aligned carbon nanotube films coated with amorphous carbon were developed into novel templates by atomic layer deposition. Freestanding macroscopic metal-oxide nanotube films were then successfully synthesized by using these templates. The reactive amorphous carbon layer greatly improved the nuclei density, which ensured the high quality of the fil...
Article
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The work function (WF) of graphene is an essential parameter in graphene electronics. We have derived the WF of graphene by the thermionic emission method. Chemical vapor deposition (CVD)-grown single-layered polycrystalline graphene on copper foil is transferred to a cross-stacked carbon nanotube (CNT) film drawn from a super-aligned multiwalled C...