Biomaterials Science
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2020
·Vol. 9
·期 5
·1795-1804
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IF 6.183
Dan-Lei Yang,Ya-Nan Cui,Qian Sun,Mei Liu,Hao Niu,Jie-Xin Wang
The accumulation of bacteria at the margin of dental resin composites is the main reason for secondary caries, which may further cause failure of prosthodontics. Therefore, antibacterial activity is highly required. However, the addition of antibacterial agents or fillers weakens the mechanical or aesthetic properties of composites. In this work, regular-shaped SiO2–ZnO complex clusters (CCs) constructed by spray-drying technology can enhance the antibacterial activity while maintaining the mechanical and aesthetic properties of dental resin composites. The results show that the regular shape and closely packed structure of nanoparticle clusters were not corrupted by the introduction of ZnO particles. As compared to resin composites filled with SiO2 nanoparticle clusters, the comprehensive performances of composites containing SiO2–ZnO CCs were further improved, and the composites filled with 70 wt% Si66Zn4 (CCs composed of 66/70 SiO2 and 4/70 of ZnO) exhibited superior antibacterial capability (antibacterial ratio >99.9%) and acceptable depth of cure, degree of conversion, and biocompatibility. The cooperation of different fillers is highly essential for resin composites to achieve enhanced multifunctional performance.
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SURFACE & COATINGS TECHNOLOGY
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2020
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IF 3.784
Meiling Zhang,Jing Yu,Jun Wang
Slippery liquid-infused porous surfaces (SLIPSs) are gaining remarkable amount of interest because of their exceptional liquid and solid repellency properties, their tolerance to high pressures and transparency. The lubricant layer may be depleted, leading to the loss of the “slippery” characteristics of the SLIPSs. Herein, we aimed to increase the lubricant storage capacity to enhance the long-term stability of SLIPSs through the construction of a hierarchical structure on the alloy substrates; the SLIPS herein thus represents a new kind of anti-corrosion material. By comparing the wetting speed of the lubricant and shear resistance properties, we showed that SLIPS with a ZnO/Co 3 O 4 /SiO 2 hierarchical structure provided the best lubricant wettability among the samples investigated herein; the lubricant was contained in the interior of this sample, thus providing the highest shear-tolerance observed. We also investigated the anti-corrosion property of SLIPSs that comprised ZnO/Co 3 O 4 /SiO 2 . The hierarchical structure had enough space to store the lubricant, which provided excellent corrosion protection for the alloy substrate.
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SENSORS AND ACTUATORS B-CHEMICAL
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2020
·
IF 7.1
Kun Li,Xiaofang Li,Xiao Chang,Xurong Qiao,Ya Xiong,Fujun Xia,Qingzhong Xue
ABSTRACT The demand of acetone gas sensors with great response value and fast response/recovery time to low concentration acetone is increasing in practical diagnosis for diabetes. In this work, metal-organic frameworks (MOFs) derived flower-like ZnO/Co 3 O 4 heterojunctions based sensor is prepared by a simple solution mixing method at room temperature. The sensor shows high acetone response value, short response/recovery time, excellent selectivity and good stability. For example, the response value of ZnO/Co 3 O 4 heterojunctions based sensor is up to 120 % towards 500 ppb acetone at 300 ℃, which is about 30-fold enhancement than these of intrinsic ZnO and Co 3 O 4 . Moreover, its minimal detection limitation is 100 ppb acetone and it shows ultra-fast response/recovery time for ppb-level acetone (22 s/27 s@500 ppb). The excellent acetone sensing properties of flower-like ZnO/Co 3 O 4 heterojunctions based sensor is attributed to the sharp resistance variation of heterojunction interface between ZnO and Co 3 O 4 and the ultra-fast gas transport channel provided by ZnO nanosheets. This finding provides important insights and useful guidance for the detection of ppb-level acetone.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Zhen Qin,Hang Sun,Yanan Tang,Zhiyong Chang,Shengyan Yin,Zhenning Liu
Inspired by the characteristics that plant leaves are beneficial for solar light absorption, we have prepared a bio-inspired hierarchical assembly of carbonized spinach leaves@Au/ZnO (CS@Au/ZnO) for solar energy utilization. CS@Au/ZnO shows a low light reflectance of 5% and a high specific surface area of 311.41 m 2 /g. CS@Au/ZnO demonstrates higher photocatalytic degradation efficiency: more than 97% of Rhodamine B (RhB) and 61% of ciprofloxacin (CIP) could be degraded in 180 min under the visible light irradiation. In addition, we also tested the photocatalytic H 2 production performance of CS@Au/ZnO and the H 2 evolution rate is 2.384 mmol g −1 h −1 under simulated solar light. CS@Au/ZnO shows a high cycling stability in recyclable photocatalytic degradation and photocatalytic water splitting. Moreover, CS@Au/ZnO shows a swift and steady photocurrent of about 63.6 μA/cm 2 , illustrating a high sensitivity to solar light. The enhanced photocatalysis performance of CS@Au/ZnO could be ascribed to the naturally optimized macroporous structure of CS with high conductivity, which could enhance the light harvesting and carrier transport, simultaneously. Moreover, modification of AuNPs can broaden the light response range of ZnONRs and reduce the probability of electron-hole recombination. Due to the wide availability of plant leaves, CS@Au/ZnO assembly has broad application prospects in photocatalytic degradation of organic pollutions, photovoltaic devices , and photocatalytic H 2 evolution.
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CERAMICS INTERNATIONAL
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2020
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IF 3.83
Jian Ding,Shuqun Chen,Ning Han,Yi Shi,Peng Hu,Hongyi Li,Jinshu Wang
Gas response control through structural and defect engineering in metal oxides are critical approaches to realize high performance sensors. Herein, we present the fabrication of ZnO thin films containing nanosized structures and high concentration of zinc interstitials for NO 2 and ethanol monitoring. The target materials were fabricated by aerosol assisted chemical vapour deposition (AACVD) method on ceramic and glass substrates, and were characterized by complementary analytical techniques. The obtained ZnO nanoparticulate and nanopyramidal thin films yielded an outstanding response of ~41 to 1 ppm NO 2 and ~236 towards 100 ppm ethanol, respectively. The reasons accounting for such an enhancement were revealed by the surface-depletion model in ZnO and the chemisorption energies of oxygen molecules on Zn i -enriched crystal facets.
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BIOSENSORS & BIOELECTRONICS
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2020
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IF 10.257
Tao Liu,Qiang Zhao,Ying Xie,Danfeng Jiang,Zhenyu Chu,Wanqin Jin
Currently, the large-scale and controllable fabrication of nanostructures on substrates remains a great challenge for further practical applications. In this work, a novel 3D aloe-like Au–ZnO nanocomposite was designed for in situ synthesis on an ITO substrate, achieving real-time detection of trace catechol (CC) in water. A seed-assisted hydrothermal approach was proposed to control the crystal distribution and growth direction to build a ZnO aloe-like architecture. To eliminate the natural weak conductivity of ZnO, Au nanoparticles were further deposited on all ZnO arrays to construct Au–ZnO micro/nanostructures. The synergetic effects derived from the aloe-like ZnO with a large specific area and Au nanoparticles with high conductivity resulted in both high electrocatalysis and fast electron transfer in enzymatic reactions . After laccase immobilization , the as-prepared biosensor exhibited specific recognition of catechol among other dihydroxybenzenes and phenol with an ultrahigh sensitivity of 131 μA mM −1 , as well as an extremely wide linear range from 75 nM to 1100 μM and an ultralow detection limit of 25 nM. In addition, in the detection of real lake samples, this biosensor showed satisfactory anti-interference ability and provided reliable assay results.
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Nano-Micro Letters
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2020
·Vol. 12
·期 1
·1-13
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IF 12.264
Liu Sisi,Li Ming-Yu,Zhang Jianbing,Su Dong,Huang Zhen,Kunwar Sundar,Lee Jihoon
AbstractSection
Highlights
High performance Al nanostructures/ZnO quantum dots heterostructure photodetectors with a controllable geometry of the Al nanostructures are demonstrated.
Light utilization of the photoactive layers is significantly boosted with the Al nanostructures.
The light confinement effect is inherently determined by the geometries of the Al nanostructures.
AbstractSection
Abstract
Light confinement induced by spontaneous near-surface resonance is inherently determined by the location and geometry of metallic nanostructures (NSs), offering a facile and effective approach to break through the limitation of the light-mater interaction within the photoactive layers. Here, we demonstrate high-performance Al NS/ZnO quantum dots (Al/ZnO) heterostructure UV photodetectors with controllable morphologies of the self-assembled Al NSs. The Al/ZnO heterostructures exhibit a superior light utilization than the ZnO/Al heterostructures, and a strong morphological dependence of the Al NSs on the optical properties of the heterostructures. The inter-diffusion of Al atoms into ZnO matrixes is of a great benefit for the carrier transportation. Consequently, the optimal photocurrent of the Al/ZnO heterostructure photodetectors is significantly increased by 275 times to ~ 1.065 mA compared to that of the pristine ZnO device, and an outstanding photoresponsivity of 11.98 A W −1 is correspondingly achieved under 6.9 mW cm −2 UV light illumination at 10 V bias. In addition, a relatively fast response is similarly witnessed with the Al/ZnO devices, paving a path to fabricate the high-performance UV photodetectors for applications.
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OPTICAL MATERIALS
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2020
·
IF 2.779
Ya Nan Wang,Jin Li
ZnO-based semiconductor photocatalysts have emerged from many catalysts and become research hotspots as non-toxic, odorless, and readily available raw materials. Ce-doped ZnO and graphene composites with different concentrations (0 wt%, 1 wt%, 2 wt%, 3 wt%, 4 wt%) were only synthesized by hydrothermal method . The results show that Ce was successfully doped in ZnO by substituting zinc vacancy and compounded with graphene, and distributed uniformly in ZnO lattice. In terms of optical properties , compared with pure ZnO, the absorption of visible light is enhanced, the light response range is widened, the number of electrons that transition back to the ground state is reduced, which indicates that the photocarriers are effectively separated. Compared with the degradation efficiency of pure ZnO (20.28%), ZGCeO series samples showed superior photocatalytic performance, among which ZGCeO2 (2 wt%) samples had the highest photocatalytic activity and catalytic efficiency, and the degradation rate reached 99.12% within 80 min. In this experiment, 2 wt% is the best doping ratio.
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CERAMICS INTERNATIONAL
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2020
·
IF 3.83
Fei Li,Li Zhuang,Wenwei Zhan,Manxi Zhou,Gang Sui,Aosong Zhou,Gang Bai,Wei Xiao,Xiaoping Yang
ZnO decorated ZnFe 2 O 4 nanoparticles were synthesized and combined with reduced graphene oxide (rGO) to form ZnFe 2 O 4 @ZnO@rGO ternary hierarchical nanocomposites by a controllable method. The microstructure, morphology, and microwave absorption performance of the ZnFe 2 O 4 @ZnO@rGO nanocomposites were investigated in detail. The permittivity and permeability of the composites can be effectively regulated by controlling the content of ZnO and rGO to achieve a good impedance matching. Due to the synergistic effect of dielectric loss and magnetic loss, the ZnFe 2 O 4 @ZnO@rGO nanocomposites exhibited strong wave absorption and wide absorption bandwidth. The optimal reflection loss (RL) of the ZnFe 2 O 4 @ZnO@rGO nanocomposites reached −35.2 dB at 12.0 GHz with a thickness of 2.0 mm and the effective absorption bandwidth was 3.7 dB. The ZnFe 2 O 4 @ZnO@rGO hierarchical architecture produced lots of heterogeneous interfaces which made a significant contribution to the wave absorption performance. The combination of interfacial polarization, dipole polarization, and eddy current loss enhanced the microwave absorption capacity of the ZnFe 2 O 4 @ZnO@rGO system. This work provides a feasible approach for the design and preparation of wave absorption materials with tunable permittivity and permeability.
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SENSORS AND ACTUATORS A-PHYSICAL
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2020
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IF 2.904
Gulgina Mamtmin,Renagul Abdurahman,Yin Yan,Patima Nizamidin,Abliz Yimit
A highly sensitive and selective optical sensor device based on a porphyrin-coated ZnO thin film/K + ion-exchanged glass composite optical waveguide (COWG) layer was developed. The surface of the ZnO film was coated with a thin film of 5,10,15,20-tetrakis-(4-methoxyphenyl) porphyrin by the spin-coating or immersion method. The optical properties of the films were probed by UV–vis and Fourier-transform infrared spectroscopies. The gas sensing performance was also examined in detail. The high sensitivity, room temperature operation, good selectivity, and reproducibility of the sensor render it a promising candidate for industrial use and in environmental monitoring.
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APPLIED SURFACE SCIENCE
·
2019
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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
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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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