CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yu Liang,Wei Li,Xuan Wang,Run Zhou,Hao Ding
TiO 2 –ZnO/Au ternary heterojunction nanocomposite was fabricated by producing TiO 2 nanosheets first using solvent-thermal method followed by Au deposition and ZnO deposition respectively. The TiO 2 nanosheets provide a relatively large surface area for the good dispersion of ZnO nanoparticles and Au particles and sufficient contact with the medium, which contribute to the excellent photocatalytic performances of TiO 2 –ZnO/Au heterojunction composite. The phases and structures, morphologies, surface and optical properties of the ternary heterojunction composite are well-characterized. Subsequently, the photocatalytic hydrogen generation of TiO 2 –ZnO/Au is evaluated under visible light irradiation. TiO 2 –ZnO/Au ternary heterojunction composite has efficient light absorption ability and excellent performances in photocatalytic hydrogen generation (1068 μmol/g under the irradiation of visible light for 4 h) and antibacterial properties (reaching 98.2%). TiO 2 –ZnO/Au ternary heterojunction nanocomposite has a large potential to be used in areas such as interior wall coating.
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CHEMISTRY-A EUROPEAN JOURNAL
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2021
·Vol. 27
·期 63
·15706-15715
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IF 5.236
Shang Chen,Kangjia Tao,Xin Chen,Yongqiang Meng,Manyun Wang,Ji Zhou,Chao Chen,Yulin Wang,Kwun Nam Hui,Christopher W. Bielawski,Jianxin Geng
Graphical A Li host material that features vertically aligned channels composed of graphene, carbon nanotubes (CNTs), and decorated ZnO particles (designated ZnO@G-CNT-C) has been prepared by using an ice-template method through oriented freezing. The Li host material not only suppresses the formation of Li dendrites but also reduces the overpotential of Li nucleation. The usability of ZnO@G-CNT-C as Li host was confirmed in full cells with a LiFePO 4 cathode. Lithium (Li) metal is regarded as the ultimate anode material for use in Li batteries due to its high theoretical capacity (3860 mA h g −1 ). However, the Li dendrites that are generated during iterative Li plating/stripping cycles cause poor cycling stability and even present safety risks, and thus severely handicap the commercial utility of Li metal anodes. Herein, we describe a graphene and carbon nanotube (CNT)-based Li host material that features vertically aligned channels with attached ZnO particles (designated ZnO@G-CNT-C) and show that the material effectively regulates Li plating and stripping. ZnO@G-CNT-C is prepared from an aqueous suspension of Zn(OAc) 2 , CNTs, and graphene oxide by using ice to template channel growth. ZnO@G-CNT-C was found to be mechanically robust and capable of guiding Li deposition on the inner walls of the channels without the formation of Li dendrites. When used as an electrode, the material exhibits relatively low polarization for Li plating, fast Li-ion diffusion, and high Coulombic efficiency, even over hundreds of Li plating/stripping cycles. Moreover, full cells prepared with ZnO@G-CNT-C as Li host and LiFePO 4 as cathode exhibit outstanding performance in terms of specific capacity (155.9 mA h g −1 at 0.5 C), rate performance (91.8 mA h g −1 at 4 C), cycling stability (109.4 mA h g −1 at 0.5 C after 800 cycles). The methodology described can be readily adapted to enable the use of carbon-based electrodes with well-defined channels in a wide range of contemporary applications that pertain to energy storage and delivery.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Shixiong Zhai,Kaili Jin,Man Zhou,Zhuizhui Fan,Hong Zhao,Xiaoyan Li,Yaping Zhao,Fengyan Ge,Zaisheng Cai
In this work, a novel flexible electrode composed of porous carbonized cotton, ZnO nanoparticles and CuS micro-spheres is prepared by two-step method. Benefitting from the synergistic effect of eletrochemical double layer capacitance and pseudo capacitance, the porous carbonized cotton/ ZnO/CuS composite (pCcZC) electrode shows excellent specific capacitance (1830 mF cm −2 at 2 mA cm −2 ), high rate performance (74% retention with the current density increasing from 2 to 10 mA cm −2 ) and outstanding cycle stability (14.8% loss of initial capacitance after 5000 cycles). The flexible and lightweight carbonized cotton as current collector directly makes the electrode binder-free, flexible and wearable. Additionally, the flexible symmetrical supercapacitor based on pCcZC electrodes achieves a superior energy density of 0.27 Wh cm −2 at 4.26 W cm −2 , and can succesfully light the LED, which manifests its great applied potential in the new generation of portable and wearable energy storage devices.
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RSC Advances
·
2019
·Vol. 9
·期 70
·41209-41217
·
IF 3.049
Xiaoxuan Di,Feng Guo,Zihan Zhu,Zhonghao Xu,Ziqi Qian,Qian Zhang
A novel ZnO–GO/CGH composite was prepared using an in situ synthesis process for photodegradation of methylene blue under visible light illumination. The chitin–graphene composite hydrogel (CGH) was used to provide uniform binding of the nano ZnO–GO composite to the hydrogel surface and prevent their agglomeration. GO provides multi-dimensional protons and electron transport channels for ZnO with a flower-like structure, which possessed improved photo-catalytic activity. SEM analysis indicates that the hydrogel has good adsorption properties with rougher surfaces and porous microstructure, which enables it to adsorb the dyes effectively. Under synergetic enhancement of adsorption and photo-catalysis, catalytic activity and nano ZnO–GO/CGH recycling improved greatly. Synthesized nano ZnO–GO/CGH showed high dye removal efficiency of 99%, about 2.2 times that of the pure chitin gel under the same condition. This suggests the potential application of the new photocatalytic composites to remove organic dyes from wastewater.
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ACS Applied Nano Materials
·
2019
·
IF 0
Junxing Hao,Caoling Li,Kangbing Wu,Chengguo Hu,Nianjun Yang
The magnetic-bead-based electrochemical enzyme-linked immunoassay (MB-eElisa) represents an attractive approach to develop cost-effective systems that are suitable for sensing complex biological samples. Its sensitivity essentially depends on the transduction efficiency of enzyme catalytic reactions into electrochemical responses. Here, an ultrahigh signal-to-noise alkaline phosphatase (ALP)-based MB-eElisa system is developed with a renewable zinc oxide-reduced graphene oxide composite modified carbon paste electrode (ZnO@rGO/CPE). This biosensing system employs one antibody decorated MB (MB-Ab1) to capture a model tumor marker—carcinoembryonic antigen (CEA)—from samples, while other antibody coated gold nanoparticles-ALP bioconjugates (Ab2-AuNPs-ALP) convert 1-naphthyl phosphate (1-NPP) into electroactive 1-naphthol (1-NP). Benefitting from the unique electrochemical properties of a ZnO@rGO/CPE, including nearly zero background and significantly enhanced responses toward the hydrolyzed 1-NP in the presence of trace surfactants, the MB-eElisa system detects selectively CEA in a calibration range of 0.01–6.0 ng mL–1 and with a detection limit of 4.0 pg mL–1 (S/N = 3). Such a system was further applied to the detection of CEA in serum samples of cancer patients. The combination of MB-based ALP-linked immunoassay with a ZnO@rGO/CPE thus establishes a reusable and inexpensive electrochemical sensing platform for the rapid and sensitive detection of ultratrace biomarkers in complex biological samples.
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RSC Advances
·
2019
·Vol. 9
·期 5
·2666-2672
·
IF 3.049
Yuzhi Zhang,Yunlong Zhang,Yunfeng Guo,Lingnan Wu,Yangqiao Liu,Lixing Song
AuPd nanoparticle-decorated graphene-coated ZnO nanorod (ZNR) array electrodes (ZNR@Gr/AuPd) were synthesized via electrostatic self-assembly followed by solution reduction methods. The morphologies of ZNR@Gr/AuPd were characterized with scanning electron microscopy (SEM), transmission electron microscopy (TEM), and atomic force microscopy (AFM), which indicated that ZNR was well-coated by graphene with 3–5 layers and uniformly decorated with AuPd nanoparticles (about 5 nm). UV-Vis diffuse reflectance and photoluminescence spectra were obtained to analyze the optical properties. The photoelectrochemical (PEC) properties were also evaluated; the results indicated that the photocurrent density was 2.27 mA cm−2 at 0.8 V versus Ag/AgCl, which was 7.1 times that of bare ZNR. The sample also displayed enhanced PEC stability (91.3%), which prevented photocorrosion. Finally, a proposed PEC mechanism of ZNR@Gr/AuPd was illustrated to explain the charge transfer and the role of graphene and AuPd nanoparticles in the improvement of PEC performance and stability. The ZNR@Gr/AuPd electrode shows excellent PEC performance and stability, exhibiting promising potential in the generation of H2.
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Journal of Coatings Technology and Research
·
2019
·Vol. 16
·期 4
·1077-1088
·
IF 1.584
Arukalam Innocent O.,Li Ying
The anticorrosion and barrier properties of poly(dimethylsiloxane) (PDMS)–ZnO nanocoating transition from superhydrophobic to hydrophobic state have been evaluated. The main objective was to appraise the durability performance of anticorrosion and barrier properties of the pristine superhydrophobic coating and its hydrophobic state after long-term exposure to marine water. Thus, water wettability, surface features, and corrosion resistance, as well as barrier performance of the 1H, 1H, 2H, 2H-perfluorodecyltrichlorosilane-modified PDMS–ZnO coating were evaluated after 15 cycles (1 h to 60 days) of immersion in 3.5 wt.% NaCl solution. The evaluations were made by use of surface analytical, physicochemical, and electrochemical techniques. The results show that the coating transformed from superhydrophobic state (after 1 h) to hydrophobic state (after 60 days). The transition was due to effect of corrosiveness of the salty water and disappearance of the surface air layer with consequent reduction in the surface roughness and increase in the porosity of the coating. Correspondingly, the value of the impedance modulus decreased from 4.257 × 10 9 Ω cm 2 (after 1 h) to 7.175 × 10 8 Ω cm 2 (after 60 days). The trend of coating film ( R cf ) and charge transfer ( R ct ) resistances with immersion time was found to be somewhat stable after 40-day immersion time. The observed high values of impedance modulus (| Z | f =0.01 Hz ), R cf and R ct after 60 days of immersion clearly demonstrate that the anticorrosion property and barrier performance of the transformed hydrophobic PDMS–ZnO coating were good.
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Frontiers of Materials Science
·
2019
·Vol. 13
·期 1
·43-53
·
IF 1.701
Wu Pengcheng,Liu Chang,Luo Yan,Wu Keliang,Wu Jianning,Guo Xuhong,Hou Juan,Liu Zhiyong
ZnO nanocone arrays (NCAs) decorated with black TiO 2 nanoparticles (B-TiO 2 NPs) were uniformly anchored on the surface of carbon cloth (CC) directly by a simply electrochemical deposition method. Thus a novel B-TiO 2 NPs/ZnO NCAs-CC hierarchical heterostructure was formed. It displayed superior performance and achieved a higher photocurrent over 0.4 mA$cm -2 before the onset of the dark current, attributed to the separation of the photogenerated electron-hole pair. Based on the B-TiO 2 NPs/ZnO NCAs-CC heterostructure, the catalyst was fabricated for promoting the separation of charge carriers. Moreover, the introduction of Ti 3+ and oxygen vacancies on the surface of TiO 2 NPs expanded the absorption band edge and enhanced the electrical conductivity as well as the charge transportation on the catalytic surface. It indicates that the B-TiO 2 NPs/ZnO NCAs-CC composite is beneficial to the improvement of the photoelectrochemical (PEC) activity.
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CATALYSIS TODAY
·
2019
·
IF 4.888
Le Yang,Rui Ma,Hui Zeng,Zebao Rui,Yongdan Li
This work provides a facile strategy to prepare core-shell structured catalysts with MOF-templated metal active species embedded carbon matrix core and a functional metal oxide shell in a controllable way. The procedure features with the facile introduction of functional shell metal oxide and delivery of MOF morphology. Co(II/Ⅲ)@ZnO hexagonal prisms are fabricated with this procedure and ZIF-67 as the template. When being used in the selective oxidation of vanillyl alcohol to produce vanillin, ZnO shell plays an important role by faciliating redox of Co 3+ /Co 2+ for promoting vanillyl alcohol oxidation to vanillin and protecting the Co species against leaching into the reaction system. Co(II/Ⅲ)@ZnO exhibits a conversion of 20% with a selectivity of 80% after a 2 h reaction and shows stability after 3 catalytic cycles.
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MOLECULES
·
2019
·Vol. 24
·期 3
·503
·
IF 3.06
Lisha Ai,Yejing Wang,Gang Tao,Ping Zhao,Ahmad Umar,Peng Wang,Huawei He
Silk sericin (SS) is a type of natural macromolecular protein with excellent hydrophilicity, biocompatibility and biodegradability, but also has very poor mechanical properties. To develop sericin-based wound dressings, we utilized polyvinyl alcohol (PVA) to reinforce the mechanical property of sericin by blending PVA and sericin, then modified zinc oxide nanoparticles (ZnO NPs) on SS/PVA film with the assistance of polydopamine (PDA) to endow SS/PVA film with antibacterial activity. Scanning electron microscopy, energy dispersive spectroscopy and X-ray powder diffraction demonstrated ZnO NPs were well grafted on PDA-SS/PVA film. Fourier transform infrared spectra suggested PDA coating and ZnONPs modification did not alter the structure of sericin and PVA. Water contact angle and swelling tests indicated the excellent hydrophilicity and swellability of ZnO NPs-PDA-SS/PVA composite film. Mass loss analysis showed ZnO NPs-PDA-SS/PVA film had excellent stability. The mechanical performance test suggested the improved tensile strength and elongation at break could meet the requirement of ZnO NPs-PDA-SS/PVA film in biomaterial applications. The antibacterial assay suggested the prepared ZnO NPs-PDA-SS/PVA composite film had a degree of antimicrobial activity againstEscherichia coliandStaphylococcus aureus. The excellent hydrophilicity, swellability, stability, mechanical property and antibacterial activity greatly promote the possibility of ZnO NPs-PDA-SS/PVA composite film in antibacterial biomaterials application.Keywords:ZnO nanoparticles;polydopamine;sericin;mechanical performance;antibacterial activity
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Xiaoxiao Sun,Chao Liu,A.M. Omer,Wuhuan Lu,Shuxing Zhang,Xun Jiang,Hongjie Wu,Di Yu,Xiao-kun Ouyang
To develop relatively green and ecofriendly smart vehicles for colon-specific drug delivery, carboxymethyl cellulose (CMC) and chitosan (CS) pH-sensitive biopolymers were used in this study. To overcome the weaknesses of CMC carriers, such as poor mechanical performance and an explosive drug release, zinc oxide (ZnO) nanoparticles were incorporated into CMC beads and then coated with a CS layer via a self-assembly technique to form core–shell polyelectrolyte complexes. An anticancer drug, 5-fluorouracil (5-FU), used as a model drug, was loaded into ZnO/CMC/CS bio-nanocomposite beads. Fourier transform infrared spectroscopy , scanning and transmission electron microscopy , and thermogravimetric analysis were used to characterize the chemical structure, morphological changes, and thermal properties of the developed drug carrier, respectively. By studying their swelling and in vitro 5-FU release profiles under simulated gastrointestinal conditions, the pH sensitivity of the developed bio-nanocomposite hydrogel beads could be investigated. The obtained beads with reduced porosity could effectively encapsulate 5-FU and showed self-sustained release behavior depending on the concentrations of CMC, CS, and ZnO nanoparticles. The developed beads also demonstrated a capacity for biodegradation. The results indicated that the ZnO/CMC/CS bio-nanocomposite beads exhibited pH-sensitivity and could be applied efficiently as biodegradable carriers for colon-specific 5-FU delivery.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Ying Liang,Mingqian Wang,Zhicheng Zhang,Guohong Ren,Yajun Liu,Shishan Wu,Jian Shen
We have constructed biocompatible antibacterial nanoplatforms on the basis of a hybrid hydrogel via simple electrostatic interaction embedded with thin layer graphene oxide (GO) sheets modified with zinc oxide quantum dots (ZnO QDs). The materials possess favorable antibacterial efficacy, thereby providing excellent killing effect for Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive) compared with materials that have single diagnosis and treatment mode. The excellent performance stems from the combined effects of hyperthermia produced under the near-infrared irradiation of GO sheets, reactive oxygen species, the release of Zn 2+ from ZnO QDs under acidic environment, and the antibacterial activity of hydrogel. The synergy of antibacterial nanoplatforms can be used for wound anti-inflammatory in vivo indicated by the wound healing results. The hybrid hydrogel causes no evident side effects to major organs in mice during wound healing. Therefore, the biocompatible multimodal therapeutic nanoplatforms have great potential for antibacterial activity and wound healing.
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