CERAMICS INTERNATIONAL
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2019
·
IF 3.45
Weidong Zhang,Yuan Zheng,Xue Zhang,Qing Zhu,Lili Tian,Hongjing Wu,Hongxia Yan,Shuhua Qi
Graphene nanoplatelets (GNPs) based materials are promising and low-cost absorbers. To develop new varieties of these absorbers, two kinds of GNPs/ZnO nanocomposites (GNPs/ZnO nanorod arrays and GNPs/ZnO nanoneedles) were synthesized in this paper, and the microwave absorption performance (MAP) together with the relevant mechanism were investigated based on the different microstructures, followed by the discussion of the growth mechanism of ZnO nanorod and nanoneedle. The result reveals that GNPs/ZnO nanorod arrays have strong reflection loss (RL) up to −44.8 dB, and effective attenuation bandwidth (RL˂-10 dB) of 4.65 GHz. While, GNPs/ZnO nanoneedles possess effective attenuation bandwidth of 6.7 GHz that covered entire X-band, and the superb RL was −15.3 dB. According to the detail analysis, we found that the pathways of attenuation EM wave are the same, and the differences between each other are responsible for the different intensity of interface polarization and multiple-scattering, due to the different microstructures.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2019
·
IF 4.784
Songyan Wang,Yuqing Lu,Xiao-kun Ouyang,Xue Xue Liang,Di Yu,Li-Ye Yang,Fangfang Huang
Groundwater contaminated by arsenic endangers our health. Therefore, in this work, a novel composite adsorbent consisting of magnetic chitosan (MCS), zinc oxide (ZnO), and sodium alginate (Alg) was prepared to remove arsenic from groundwater. First, chitosan was coated on the surface of Fe 3 O 4 nanoparticles by coprecipitation. Then, MCS/ZnO@Alg gel beads were fabricated by combining MCS with ZnO and Alg , and crosslinking the composite material in the presence of Ca 2+ ions. The MCS/ZnO@Alg beads were characterized by SEM, FTIR spectroscopy , XRD, VSM, and XPS . The adsorption experiments revealed that the MCS/ZnO@Alg magnetic gel beads have high stability and As(V) adsorption capability, and adsorbed As(V) through chemical adsorption. The maximum As(V) adsorption capacity as determined from the Langmuir model was 63.69 mg/g. In addition, MCS/ZnO@Alg exhibited good recyclability and high sustainability. This work proves that the MCS/ZnO@Alg gel beads are an ideal candidate for addressing the grievous environmental threats caused by water pollution.
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Advanced Sustainable Systems
·
2019
·Vol. 3
·期 5
·1800167
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IF 0
Muhammad Sohail Riaz,Xiaotao Yuan,Yantao Zhao,Chenlong Dong,Shuying Nong,Zeeshan Ali,Fuqiang Huang
Innovative nano/microarchitectures, owing to their promising catalytic features, such as abundant active sites, high surface area, and enhanced ion transport, are ideal for oxygen electrocatalysis. Herein, an inventive approach is put forward to fabricate ternary metal sulfide hollow microcubes by a hydrothermal method between spherical porous ZnO with transition metal cations in the presence of urea followed by etching and sulfurization. The significant electrocatalytic activity toward oxygen evolution reaction (OER) with onset potential of 1.48 V (vs reversible hydrogen electrode (RHE)) is obsereved. The objective material shows an overpotential of 320 mV, to achieve a current density of 10 mA cm −2 for OER and excellent robustness with slight variation in potential after long-term chronopotentiometry test for 12 h. As expected, the material also exhibits oxygen reduction reaction (ORR) activity with a half wave potential of 0.8 V (vs RHE) and limited current density of 5.1 mA cm −2 . Meanwhile, further investigations confirm the near four-electron transport pathways for ORR. Such up-bottom etching followed by sulfurization method provide a new concept for engineering porous electrocatalysts.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Rui Gao,Xiaoli Cheng,Shan Gao,Xianfa Zhang,Yingming Xu,Hui Zhao,Lihua Huo
It is very necessary to quickly and selectively detect the abused drugs in real time, because of their bad influence on the central nervous system. So ZnO nanorod bundles were prepared by simple hydrothermal reaction combined with calcination in this paper, which were assembled into thick film gas sensor to detect three analogs of drugs. Such ZnO nanorod bundles gas sensor exhibited not only good gas response and selectivity , but also good reproducibility and stability to the saturated vapors of three kinds of drugs (C 10 H 15 NO, C 9 H 13 NO, C 8 H 9 NO 2 ) at 252 °C. The excellent gas response can be ascribed to its rough surface and the large number of holes formed by nanorod bundles accumulation, which are conducive to diffusion , adsorption and desorption of gas molecules on ZnO nanorods. The reaction mechanism was further analyzed and discussed by XPS.
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NANO
·
2019
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IF 1.293
Huanhuan Xu,Lihe Yan,Jinhai Si,Yanmin Xu,Xun Hou
Zinc oxide (ZnO) nanoparticles (NPs) are synthesized by one-step femtosecond laser ablation of zinc powders in n-methyl pyrrolidone (NMP) at room temperature. The as-prepared ZnO NPs are fairly stable, water-soluble and have abundant surface functional groups resulting in a strong fluorescence in the visible region. By further annealing the ZnO NPs in the reacting solvent up to 120 ∘ C, the photoluminescence (PL) intensity of material can be significantly enhanced. Besides, the PL of ZnO NPs can change from blue to green by controlling the annealing temperature. The products exhibit excellent temperature sensing with high temperature sensitivity and a 1.3% change per ∘ C response over a linear temperature sensing range (6–84 ∘ C ) in aqueous buffer, which matches well with the physiologically relevant temperatures. Hence, the ZnO nanoparticle system can serve as a promising candidate for practical fluorescent temperatures nanosensors which can be used for accurate temperature monitoring within biological systems.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Shuying Gao,Fu Yang,Changjian Song,Qiong Cai,Ruyi Wang,Shijian Zhou,Yan Kong
As an energy-efficient and environmental friendliness method, solar sunlight-driven photo-oxidation catalysis process for organic chemicals synthesis has gained enormous attention, but still faces huge challenge in developing highly-efficient photocatalysts material. Two-dimensional materials engineering and surface defect engineering of photocatalysts both provide an effective strategy to improve the catalytic activity. Inspired by this pathway, we design and synthesize ultrathin porous ZnO nanosheets featuring abundant oxygen vacancies specific to producing dihydroxybenzenes based on a photocatalytic oxidation process. Several valid characterizations had been employed to discern the structural character of the obtained model catalyst, revealing that the resultant ZnO sheets afford an average thickness of 3 nm, and abundant surface porosity, thereby contributing to the rich oxygen vacancies. Such a structure could generate a synergistic effect to enhance the optical absorption and improve the transportation rate of photogenerated charge carriers from the materials design. As expected, the specific ultrathin ZnO nanosheets exhibited a greatly-improved photocatalytic activity for oxidation of phenol to dihydroxybenzenes (31.5% conversion & almost 76.7% selectivity of DHB), near 3 and 4 times higher, respectively than its counterparts that one with few oxygen vacancies and Bulk-ZnO. Impressively, the obtained catalyst showed durable catalytic activity without any activity loss during the five recycling. Finally, the feasible oxidation mechanism was proposed and testified by the controlled scavenger experiments. This study provides a novel reference on how to design high-performance photocatalytic material.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2019
·Vol. 26
·期 6
·1306-1313
·
IF 5.16
Muhammad Sohail Riaz,Siwei Zhao,Chenlong Dong,Shuying Nong,Yantao Zhao,Muhammad Javed Iqbal,Fuqiang Huang
Graphical Selenized and phosphorized cobalt-nickel oxide microcubes formed by a novel strategy using a sacrificial ZnO spherical template are employed as an oxygen evolution reaction (OER) electrocatalyst. The selenized samples manifest desirable and robust OER performance, with comparable overpotential at 10 mA cm −2 (312 mV) as RuO 2 (308 mV) and better activity when the current reaches 13.7 mA cm −2 . Oxygen electrocatalysis is of remarkable significance for electrochemical energy storage and conversion technologies, together with fuel cells, metal-air batteries, and water splitting devices. Substituting noble metal-based electrocatalysts by decidedly effective and low-cost metal-based oxygen electrocatalysts is imperative for the commercial application of these technologies. Herein, a novel strategy is presented to fabricate selenized and phosphorized porous cobalt-nickel oxide microcubes by using a sacrificial ZnO spherical template and the resulting microcubes are employed as an oxygen evolution reaction (OER) electrocatalyst. The selenized samples manifest desirable and robust OER performance, with comparable overpotential at 10 mA cm −2 (312 mV) as RuO 2 (308 mV) and better activity when the current reaches 13.7 mA cm −2 . The phosphorized samples exhibit core–shell structure with low-crystalline oxides inside amorphous phosphides, which ensures superior activity than RuO 2 with the same overpotential (at 10 mA cm −2 ) yet lower Tafel slope. Such a surface doping method possibly will provide inspiration for engineering electrocatalysts applied in water oxidation.
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SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Hongtao Wang,Jihao Bai,Meng Dai,Kunpeng Liu,Yueying Liu,Linsheng Zhou,Fengmin Liu,Fangmeng Liu,Yuan Gao,Xu Yan,Lu Geyu
In this work, 2D/2D ZnO/g-C 3 N 4 heterojunction composite was synthesized through an ultrasonic mixing and subsequent calcination process. The gas-sensing performance to NO 2 was investigated at room temperature activated by visible/ultra-violet LED light sources. Noticeably, when ZnO/g-C 3 N 4 composite is illuminated by 460 nm light, it exhibits the highest response of 44.8 to 7 ppm NO 2 , and the response and recovery time is 142 and 190 s, respectively. Furthermore, it possesses excellent repeatability and selectivity to NO 2 , and the limit of detection is 38 ppb. In addition, the effect of humidity on the sensing performance under visible light was also investigated. The excellent gas-sensing performance is attributed to the absorbance of g-C 3 N 4 in the visible light region and the charge separation at the interface between ZnO and g-C 3 N 4 .
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Frontiers of Materials Science
·
2019
·Vol. 14
·期 1
·14-23
·
IF 1.701
Peng Mengke,Hu Fenyan,Du Minting,Mai Bingjie,Zheng Shurong,Liu Peng,Wang Changhao,Chen Yashao
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 fabricated bilayered nanoarrays of hydroxyapatite nanorods (HANRs) and ZnO nanorods (ZnONRs) onto the surface of MgA (MgA-MgO-HANRs-ZnONRs) via micro-arc oxidation (MAO) treatment, microwave-assisted hydrothermal and hydrothermal methods. The morphology and chemical composition of MgA-MgO-HANRs-ZnONRs was characterized by FE-SEM, XRD and EDS, indicating that HANRs-ZnONRs bilayered nanoarrays were fabricated on the surface of MgA-MgO. The surface of MgA-MgO-HANRs-ZnONRs exhibited excellent hydrophilicity as evidenced by the low water contact angle of 3°. Compared with the original MgA, the corrosion resistance of MgA-MgO-HANRs-ZnONRs was obviously improved with decreasing the corrosive current density ( i corr ) of 2 orders of magnitude. The MgA-MgO-HANRs-ZnONRs performed excellent antibacterial properties with the bactericidal rate of 96.5% against S. aureus and 94.3% against E. coli .
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Feiya Fu,Jiayuan Gu,Ruihong Zhang,Xinyi Xu,Xiaodong Yu,Lin Liu,Xiangdong Liu,Jinping Zhou,Juming Yao
Cellulose based Ag-functionalized ZnO nanocomposite (AZC) films were prepared using a green and easy scale-up strategy. Firstly, ZnO embedded cellulose (ZC) nanocomposite was synthesized from a cellulose-NaOH/zincate/urea solution through a biomimetic approach. Secondly, Ag nanoparticles (NPs) with a mean diameter of 53.2 nm were efficiently deposited onto the surface of embedded ZnO in cellulose matrix under UV irradiation (16 w), yielding the multi-hybrid AZC film. Owing to the porous structure of cellulose substrate and its rich hydroxyl group , the NPs in the ACZ films displayed good stability. Because of the formation of Schottky barriers in the Ag-ZnO regions, the catalytic activity of ACZ films increased by 20 times when compared to that of ZC sample. Furthermore, the AZC films could completely inhibit both S. aureus and E. coli growth. This facile and eco-friendly approach is expected to pave the way for constructing multifunctional cellulose material for various niche applications.
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NANOTECHNOLOGY
·
2018
·Vol. 30
·期 2
·025501
·
IF 3.404
Danqing Liu,Tianchan Li,Weicheng Huang,Zhuang Ma,Wei Zhang,Rui Zhang,Hong Yan,Bin Yang,Shaoqin Liu
Foodborne pathogens are perpetual threats to human and animal health. Detection of pathogens requires accurate, sensitive, rapid and point-of-care diagnostic assays. In this study, we described a simple and sensitive electrochemiluminescent (ECL) assay to detect the deadly bacteria Escherichia coli O157:H7 by {\rm{Ru}}{{({\rm{bpy}})}_{3}}^{2+}-coated ZnO nanorods arrays (NAs). The {\rm{Ru}}{{({\rm{bpy}})}_{3}}^{2+}-coated ZnO NAs were fabricated by immobilizing {\rm{Ru}}{{({\rm{bpy}})}_{3}}^{2+} on ZnO NAs with a large specific surface area and good conductivity. An {\rm{Ru}}{{({\rm{bpy}})}_{3}}^{2+}-2-(dibutylamino)-ethanol (DBAE) system coated on ZnO NAs exhibits high ECL intensity, rapid response and good stability. This system was further developed as an ECL immunosensor used in the detection of E. coli O157:H7. The proposed ECL immunosensor exhibits a broad detection range within the scope of 200–100 000 CFU ml−1 and quite a low detection limit of 143 CFU ml−1. The high specificity, remarkable reproducibility and good stability offer a sensitive, selective, and convenient pathway for detecting E. coli O157:H7 in the field of food safety and clinical diagnosis.
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Polymers
·
2018
·Vol. 10
·期 11
·1272
·
IF 2.935
Yifan Wang,Liang He,Bing Yu,Yang Chen,Youqing Shen,Hailin Cong
In this paper, we reported a pH responsive nano drug delivery system (NDDS) based on ZnO quantum dots (QDs) for controlled release of drugs. Zwitterionic poly(carboxybetaine methacrylate) (PCBMA) and poly(2-(dimethylamino) ethyl methacrylate) (PDMAEMA) were introduced to modify ZnO QDs, which can help enhance water stability, increase blood circulation time, and promote endocytosis. After tuning of PCBMA/PDMAEMA ratios, the ZnO@P(CBMA-co-DMAEMA) nanoplatform shows a sensitive switch from strong protein adsorption resistance (with negatively charged surface) at physiological pH to strong adhesion to tumor cell membranes (with positively charged surface) at the slightly acidic extracellular pH of tumors. Anti-cancer drug, Doxorubicin (DOX), molecules were demonstrated to be successfully loaded to ZnO@P(CBMA-co-DMAEMA) with a relatively large drug loading content (24.6%). In addition, ZnO@P(CBMA-co-DMAEMA) loaded with DOX can achieve lysosomal acid degradation and release of DOX after endocytosis by tumor cells, resulting in synergistic treatment of cancer, which is attributed to a combination of the anticancer effect of Zn2+and DOX.Keywords:Zinc oxide quantum dots (ZnO QDs);poly(carboxybetaine methacry late) (PCBMA);poly(2-(dimethylamino) ethyl methacrylate) (PDMAEMA);drug delivery
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