JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2024
·
IF 3.2
Bo Wang,Zihao Pan,Ziyan Zhao,Bo Zhou,Xuejian Liu,Zhengren Huang,Yan Liu
In this paper, we designed two series of the ZnO-B 2 O 3 -SiO 2 (ZBS) glass to explore their applicability for joining AlN ceramic. The density, flexural strength, structure, characteristic temperature, coefficient of thermal expansion (CTE) and crystallization behavior of the ZBS glass with varying ZnO and B 2 O 3 content were systematically studied. The results show that as B 2 O 3 content increase, the glass network is disrupted with the transition from three-dimensional shelf-like structure [BO 4 ] to two-dimensional layers [BO 3 ], increasing the number of the broken bonds, while an increase in ZnO results in a more compact glass network structure. We also found that both glass transition temperature (T g ) and softening temperature (T S ) exhibit a declining trend with the increase in B 2 O 3 and ZnO. Zn 2 SiO 4 and ZnAl 2 O 4 , began to precipitate after heat treatments in all the samples except 60ZnO-30B 2 O 3 –10SiO 2 (abbreviated as B30), where the diffraction peaks do not appear in Zn 2 SiO 4 but in Zn 4 B 6 O 13 . Notably, Zn 2 SiO 4 is the main phase for most samples while the main phase of B30 sample is ZnAl 2 O 4 . The CTE increases from 4.6 to 5.03 (× 10 –6 / °C) and 4.23 to 4.73 (× 10 –6 / °C) with an increase of B 2 O 3 and ZnO content, respectively. Among these, the CTE of B30 sample is compatible with that of AlN ceramic substrate. The optimal shear strength, 60.32±10.26 MPa, was achieved with B30 samples at 750 °C. The high strength was attributed to the interfacial reaction that leads to strong chemical bonding and the uniform distribution of the ZnAl 2 O 4 in the interlayer, which reinforces the strength of the interlayer itself.
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Polymer Chemistry
·
2024
·
IF 4.1
Junyan Zhao,Yu Rao,Hengyuan Zhang,Zhichen Zhu,Lihua Yao,Gaojian Chen,Hong Chen
ZnO–polymer core–shell nanoparticles were successfully prepared using a simple in situ open-to-air PET-RAFT method. The utilization of vinyltriethoxysilane (VTES) modified ZnO NPs as catalysts for polymerization, along with the grafting of polymers onto the ZnO NPs, offers significant antibacterial properties. The cationic monomer methacrylamide guanidine hydrochloride (MAGH) and the glycomonomer 2-methacrylamido glucopyranose (MAG) were grafted onto the ZnO NPs surface, further enhancing the antibacterial properties by promoting contact with bacteria and specific recognition of E. coli FimH proteins, leading to a significant improvement in the antibacterial ability compared with ZnO NPs. By combining the photocatalytic and antibacterial properties of ZnO NPs, the preparation of a core–shell material with good antibacterial properties was successfully achieved, providing a new strategy for the synthesis of antimicrobial materials.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Haiyan Yao,Yuan Fan,Emine Sumeyra Turali Emre,Na Li,Min Ge,Jiaolong Wang,Junchao Wei
Bacterial infections is one of the main factors delaying the wound healing, which has become a serious challenge for healthcare systems. Zinc oxide nanoparticles (ZnO NPs), which show broad-spectrum and excellent antibacterial activity, tend to aggregate easily and therefore hardly penetrate into bacterial biofilms, showing limited anti-biofilm properties. Herein, alginate (ALG) modified ZnO NPs (ZnO@ALG) were prepared via the combination of mussel-inspired method and “thiol-Michael” click reaction, which showed excellent dispersion and biocompatibility. Besides, the interactions between ZnO@ALG and bacteria was much better than that of ZnO NPs, and makes the bacteria produced more reactive oxygen species (ROS) than bare ZnO NPs. The anti-planktonic activity of ZnO@ALG (250 μg/mL) could reach almost 100 %, which was 2–3 times higher than that of bare ZnO NPs. In addition, the ZnO@ALG could significantly accelerate the healing of S. aureus infected wounds, and the wound healing rate of ZnO@ALG group was about 79.2 %, which was significantly higher than that of ZnO NPs (∼65.8 %). This study demonstrates that the ZnO@ALG holds a great potential in the anti-planktonic and anti-biofilm fields, and the ALG-modification method can be an effective strategy to enhance the antibacterial properties of nanomaterials.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yuhong Zhang,Yanchang Liu,Junlong Liu,Zhihao Qu,Siye Tian,Hang Liu
Here, Ce-doped ZnO flower-like nanosheets are prepared by one-step hydrothermal method . The sensor based on Ce–ZnO composite exhibits excellent gas-sensing properties to acetone. Compared with pure ZnO, the response of Ce–ZnO composite is increased by 5.5 times, and the optimum operating temperature is reduced by 60 °C. The gas-sensing properties of the sensor to acetone under different humidity conditions are investigated. The redox reaction of Ce element increases the anti-humidity of Ce–ZnO sensor. Finally, the gas sensing mechanism of Ce–ZnO nanomaterial and anti-humidity principle are discussed in detail. The result can provide a new material for develop high sensitivity acetone sensor and a new anti-humidity strategy for designing gas sensing materials.
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IEEE SENSORS JOURNAL
·
2025
·
IF 4.5
Peizhe Wang,Tingyu Zhang,Yanrong Wang,Beixi An,Zhengkun Wu,Yifan Yang,Ruiqi Han,Erqing Xie
Ethylene glycol is a type of volatile organic compound, and its respiratory products pose significant risks to human and biological cells. Therefore, it is necessary to monitor the concentration of ethylene glycol in the environment. Metal oxide semiconductors exhibit good response to ethylene glycol gas. However, previous reports on ethylene glycol sensors have drawbacks such as high operating temperature and high- energy consumption, which cannot perfectly meet the needs of practical life. In this work, the photosensitive material ZnO was chosen as the sensing material for ethylene glycol, and the rare earth element Er was composite into it, achieving high response to ethylene glycol under 70 °C ultraviolet light. The results showed that the response value of 7% Er/ZnO to 100ppm ethylene glycol was as high as 156.6, while retaining high selectivity for ethylene glycol gas. The combination of high response value of ethylene glycol and lower operating temperature near room temperature indicates that the sensor based on 7% Er/ZnO achieves a balance between sensitivity, response value, and operating temperature. UV spectroscopy and PL spectroscopy characterization confirmed that the energy levels of Er2O3 composite ZnO changed, effectively extending the lifetime of photo generated carriers. The mechanism of device performance optimization was analyzed through photocurrent testing. This work has basically achieved the photoactivation of ZnO gas sensors, providing ideas for the practical application of ethylene glycol gas monitoring.
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JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 13
·5345-5358
·
IF 3.5
Zhang Min,Deng Xingping,Yang Hua,Ding Yao,Ran Longzheng,Zhang Liang
Abstract Sulfonamides are detected in various water environments and threaten aquatic ecosystems. To remove sulfonamides, many previous studies have focused on preparing metal–organic framework-derived carbon materials (MOFs-CMs) applied in persulfate activation. In this study, Fe-based MOFs derived from porous carbon materials were obtained by facile one-pot hydrothermal and pyrolysis. The catalyst can overcome passivation in alkaline environments and showed a high peroxydisulfate (PDS) activation performance. Unlike traditional modifications, ZnO was added during the synthesis process to control the morphology characteristics of the catalyst. FeZn–MOF-CMs in this study displayed a high sulfadiazine removal efficiency of 99.6% in alkaline conditions, and exhibited high resistance to common anions and organic matter. The surface morphology could be controlled by different amounts of ZnO additions and the free radical pathway was the main mechanism in the PDS system. This study provides a facile synthesis method for the preparation of porous carbon materials from Fe-based MOFs. Graphical abstract
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ACS Sensors
·
2024
·
IF 8.2
Chengming Sui,Mingxue Zhang,Yueyue Li,Yilin Wang,Yuanzhen Liu,Ziqi Liu,Jihao Bai,Fengmin Liu,Geyu Lu
Bimetallic nanocrystals (NCs) have obtained significant attention due to their unique advantages of the intrinsic properties of individual metals and synergistic enhancements resulting from the electronic coupling between two constituent metals. In this work, Pd@Pt core–shell NCs were prepared through a facile one-pot solution-phase method, which had excellent dispersion and uniform size. Concurrently, ZnO nanosheets were prepared via a hydrothermal method. To explore their potential in nitrogen dioxide (NO2) gas sensing applications, sensitive materials based on ZnO nanosheets with varying mass percentages of Pd@Pt NCs were generated through an impregnation process. The sensor based on 0.3 wt % Pd@Pt-ZnO exhibited remarkable performance, demonstrating a substantial response (Rg/Ra = 60.3) to 50 ppb of NO2 at a low operating temperature of 80 °C. Notably, this sensor reached an outstanding low detection limit of 300 ppt. The enhancement in gas sensing capabilities can be attributed to the sensitization and synergistic effects imparted by the exceptional catalytic activity of Pd@Pt NCs, which significantly promoted the reaction. This research introduces a novel approach for the utilization of core–shell structured bimetallic nanocrystals as modifiers in metal-oxide-semiconductor (MOS) materials for NO2 detection.
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Coatings
·
2025
·Vol. 15
·期 1
·63
·
IF 2.8
Yu Wang,Lei Ma,Yanan Niu,Huachao Ma,Yuguang Lv,Kuilin Lv
Throughout millions of years of biological evolution, shell structures have developed a highly complex layered organic–inorganic structure that makes them effective against a wide range of external impacts, including mechanical stress and chemical corrosion. Therefore, shell-like biomimetic materials are considered to possess high strength and toughness. Nevertheless, although shell structures have exhibited superior performance across multiple domains, understanding of their structural complexities and corrosion protection mechanisms remains relatively limited within the scope of human knowledge. In this study, alternating ZnO–graphene/epoxy coatings featuring shell-like structures were synthesized, and their anticorrosion properties were evaluated through the incorporation of ZnO to enhance the dispersion of graphene. Electrochemical impedance spectroscopy (EIS) tests showed that with an increased number of ZnO–graphene layers, the coating resistance of the bionic composite coating also increased: from 8.21 × 107Ω·cm2of the pure epoxy coating to 7.64 × 108Ω cm2. The composite coating, comprising three alternating layers of zinc oxide and four layers of epoxy resin, exhibited an electrochemical impedance two orders of magnitude greater than that of pure epoxy resin following immersion in a 3.5% sodium chloride solution, demonstrating excellent corrosion resistance. The results showed that with increased ZnO–graphene layers, ZnO–graphene disperses more uniformly in water and has greater rigidity.
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OPTICAL MATERIALS
·
2024
·
IF 3.8
Qian Qiao,Tongge Zhao,Jian Zheng,Huiting Yin,Yuan Zhang,Jinhao Zang,Xun Yang,Haoyu Li,Taotao Rao,Xuan Yu,Xiaoming Yu
Self-powered poly (3-hexylthiophene)/zinc oxide (P3HT/ZnO) heterojunction ultraviolet photodetectors decorated by silver nanoparticles (Ag NPs) were fabricated by sol-gel and spin-coating techniques. The ultraviolet photoresponse performance of the P3HT/ZnO heterojunction photodetectors influenced by the position of plasmonic Ag NPs was investigated. The responsivity and detectivity of the P3HT/Ag/ZnO photodetector with placed Ag NPs at the interface of ZnO and P3HT layers enhanced to 1.92 and 1.15 times compared to the reference devices. When the Ag NPs embedded into ZnO layer , the responsivity, detectivity and external quantum efficiency were 16.42 mA/W, 5.97 × 10 11 Jones, and 5.36 %, respectively, which were 5.77 times, 4.64 times and 5.77 times to that of the pristine P3HT/ZnO photodetector. The enhancement mechanism of plasmonic metallic nanoparticles to the performance of the photodetectors was discussed in details. This study presents a simple route to high performance self-powered photodetectors.
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Desalination and Water Treatment
·
2024
·
IF 1
Ling Yu,Yiqiao Xie,Mengxiao Liu,Lianyu Liu,Zhi Chen,Yang Yu
The wide-spread micropollutants in water have posed severe risks to human health and eco-environment. However, the current treatment techniques generally suffer from low efficiency, high cost and unpractical application feasibility. In this study, a piezoelectric membrane was fabricated by embedding zinc oxide (ZnO) nanorods with several micrometer length into polytetrafluoroethylene nanofiber membrane and applied for the removal of carbamazepine (CBZ) from water. After the sintering, the prepared membrane showed a narrower pore size distribution with the average pore size of ∼1.7 µm. The addition of ZnO nanorods could significantly improve the piezoelectric property of the membrane. During the membrane filtration, the peroxymonosulfate could be effectively activated by the prepared piezoelectric membrane with 2 % ZnO dosage to generate free radicals, achieving about 83.1 % of CBZ from water. According to the radical quenching tests and electron spin-resonance analysis, the hydroxyl radical, sulfate radical, singlet oxygen and superoxide radical greatly participated in the CBZ removal. The CBZ removal efficiency in the US/PMS/PTFE@ZnO-2 system was decreased by 18.2 % after continuous 5-cycle operation, but the performance could be easily renewed by methanol rinsing, demonstrating its attractive reusability and application potential on the efficient removal of micropollutants from water.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shuaifei Mao,Jiantong Ge,Lingling Zhang,Yannan Dai,Sheng Jiang,Yafei Chen,Chunli Jiang,Chunhua Luo,Bobo Tian,Hechun Lin,Hui Peng,Chun-Gang Duan
The advent of artificial photoelectric synapse devices has attracted considerable attention due to their potential to reshape the landscape of neuromorphic computing. A critical challenge impeding their wider application is the typically short image retention time these devices exhibit. In this study, a strategy is developed to address this obstacle by combining the formation of heterojunction and defect-trapping effects. A Cu 2 ZnSnS 4 (CZTS) film is prepared via low-temperature annealing to form a type II heterojunction with ZnO . The two-terminal device based on this heterojunction shows excellent synaptic functionality. The wide absorption of CZTS film in the visible light spectrum enables the device to achieve a broadband response, which is crucial for realizing the simulation of Pavlov’s associative memory. Its utility in encoding encrypted information is demonstrated through the capability to simulate Morse code. Most importantly, the device exhibits image memory for periods exceeding 1100 s, highlighting its exceptional performance in visual memory retention. These results contribute to the development of CZTS-based photoelectric synaptic devices with broad response characteristics and non-volatile memory capabilities.
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ChemSusChem
·
2024
·
IF 7.5
Shiyan Deng,Huiyao Li,Wenhao Tang,Youlan Zou,Shuang Deng
Graphical The advantages of quantum size effect and lithiophilic characteristics of ZnO QDs ensure the sufficient contact and uniform distribution with PEO chains, enhance the REDOX kinetics at the Li/PEO interface and the stability of Li anode. Li/PEO/Li and Li/PEO/LiFePO 4 cells with 3 wt.% ZnO QDs electrolyte fillers can work steadily and provide considerable reversible capacity. PEO-based solid polymer electrolyte (PEO SPE) is regarded as one of the most promising solid electrolytes due to its exceptional flexibility, cost-effectiveness, and ease of integration. However, its commercialization is hindered by inadequate ionic conductivity and unstable interface. By incorporating proper ZnO quantum-dots (QDs) fillers with enhanced surface activity, the ion transport inner the PEO-based electrolyte can be improved along with enhanced REDOX kinetics at the Li/PEO interface. The ionic conductivity reaches 5.97×10 −4 S cm −1 at 60 °C. Moreover, ZnO QDs exhibit a quantum size effect and possess lithiophilic characteristics that promote uniform nucleation and redeposition of Li + while forming a stable Li−Zn alloy. This inhibits lithium dendrite formation and enhances the stability of Li anode. Li//Li cell with 3 % ZnO QDs works steadily for more than 2100 h at 60 °C with 0.1 mA cm −2 . The assembled Li//LiFePO 4 cell provides a reversible capacity of 134.91 mAh g −1 after200 cycles at 0.1 C.
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