Nanomaterials
·
2022
·Vol. 13
·期 1
·39
·
IF 5.719
Yuan-Dong Xu,Yan-Ping Jiang,Xin-Gui Tang,Qiu-Xiang Liu,Zhenhua Tang,Wen-Hua Li,Xiao-Bin Guo,Yi-Chun Zhou
Resistive random-access memory (RRAM) is a promising candidate for next-generation non-volatile memory. However, due to the random formation and rupture of conductive filaments, RRMS still has disadvantages, such as small storage windows and poor stability. Therefore, the performance of RRAM can be improved by optimizing the formation and rupture of conductive filaments. In this study, a hafnium oxide-/aluminum-doped zinc oxide/hafnium oxide (HfO2/Al-ZnO/HfO2) tri-layer structure device was prepared using the sol–gel method. The oxygen-rich vacancy Al-ZnO layer was inserted into the HfO2layers. The device had excellent RS properties, such as an excellent switch ratio of 104, retention of 104s, and multi-level storage capability of six resistance states (one low-resistance state and five high-resistance states) and four resistance states (three low-resistance states and one high-resistance state) which were obtained by controlling stop voltage and compliance current, respectively. Mechanism analysis revealed that the device is dominated by ohmic conduction and space-charge-limited current (SCLC). We believe that the oxygen-rich vacancy concentration of the Al-ZnO insertion layer can improve the formation and rupture behaviors of conductive filaments, thereby enhancing the resistive switching (RS) performance of the device.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Liyong Du,Guoli Yang,Yi Liu
The research on the synthesis of three-dimensional (3D) porous structures has garnered significant interest among scholars. In this study, ZnSnO 3 /ZnO heterostructures are prepared using butterfly wings as biotemplates, resulting in the formation of a hierarchical porous network structure characterized by regular ridges and pillars. Subsequently, we construct a resistive gas sensor utilizing these ZnSnO 3 /ZnO heterostructures, which exhibits not only a relatively high responses (14.7) but also rapid response and recovery speed (1 s/6 s) when exposed to 100 ppm n-propanol at 220 °C. Furthermore, the sensor demonstrates a low limit of detection (LOD) of 432 ppb, strong repeatability, good long-term stability (80 days), and excellent anti-humidity properties (S 84 % /S 33 % ≈ 0.84). The enhanced gas sensing performance is primarily attributed to the formation of ZnSnO 3 /ZnO n-n heterostructures, the increase in oxygen vacancies, and the presence of ordered open porous structures. Consequently, ZnSnO 3 /ZnO heterostructures show significant potential for the detection of n-propanol gas in practical applications. This work also presents a promising strategy for the development of homogeneous/heterogeneous materials with a 3D open porous structure, which can be applied in surface-related fields.
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Scientific Reports
·
2025
·Vol. 15
·期 1
·1-16
·
IF 3.9
Dong Yuqi,Qiao Qing-an,Wang Ruping,Yang Yueyue,Cai Honglan,Gao Hongwei
Environmental pollution caused by industrial waste is an increasing concern, and the design and development of efficient photocatalysts offer promising approaches to address this issue. A series of novel Zn 0.6 Cd 0.4 S/ZnO/g-C 3 N 4 composites were prepared through a calcination‒hydrothermal method. Under visible light, these materials demonstrated exceptional performance in the photodegradation of methylene blue (MB), rhodamine B (RhB), and tetracycline (TC). Among the composite materials, Z 0.6 C 0.4 S/ZnO/CN-35% exhibited the highest degradation efficiencies for MB (98.52%), RhB (99.45%), and TC (98.20%), demonstrating excellent reusability as well. The photocatalytic performance of the catalysts was assessed across various water sources and different pH conditions. The findings revealed that the degradation efficiency for contaminants in seawater, lake water, and tap water closely mirrored that observed in deionized water, suggesting wide adaptability among different aqueous solutions. The exceptional photocatalytic performance of the composite materials can be attributed primarily to the efficient separation and migration of holes (h + ) and electrons (e − ) via well-contacted interfaces. Free radical capture experiments confirmed that hydroxyl radicals (·OH) and superoxide ion radicals (·O 2 - ) play crucial roles in the reaction process. The photocatalytic mechanism was also revealed via density functional theory (DFT) calculations. This work introduced an innovative strategy to design and fabricate novel photocatalysts, emphasizing their extensive applications from both theoretical and experimental aspects.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Xiangyu Han,Hong Chen,Zuozhu Yin,Yuhua Chen,Zhen Hong,Yidan Luo,Mingshan Xue
Epoxy resins are widely used in microelectronic packaging for wearable devices due to their excellent insulating properties and superb chemical stability. However, the performance of epoxy resins in high-temperature and humid environments is hindered by moisture condensation, which reduces thermal conductivity and may lead to the failure of electronic components. Herein, we propose a dual bio-inspired composite membrane based on ZnO/SiC/epoxy resin. It synergistically integrates high thermal conductivity, which is more than 50 % higher than pristine epoxy resin, and superior superhydrophobicity, with a water contact angle: 160° ± 1°. Addressing a critical gap in multifunctional thermal management materials, unlike previous studies that focused on a single function, such as vertically aligned boron nitride (BN) composites for thermal conductivity or ZIF-8/POTS coatings for hydrophobicity, this study innovatively combines polyurethane-modified ZnO and SiC with 1H,1H,2H,2H-perfluorooctyltriethoxysilane (POTS) to achieve dual functionality. POTS-modified ZnO/SiC coatings form layered micro/nano-roughness and low surface energy through covalent Si-O-Si and C-F bonding, outperforming conventional physically roughened surfaces. The cost-effective coating method replaces complex layer-by-layer deposition, ensuring uniform dispersion and industrial viability. This work not only addresses the trade-off between thermal management and environmental resilience, but also pioneers a scalable strategy for next-generation electronics packaging, especially for 5 G and wearable technologies. By demonstrating synergistic material design and proven long-term stability, this research sets a benchmark for the use of multifunctional composites in demanding operating environments.
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Materials
·
2017
·Vol. 10
·期 11
·1267
·
IF 2.654
Baokang Dang,Yipeng Chen,Xiaoping Shen,Bo Chen,Qingfeng Sun,Chunde Jin
A polyethylene/wood-fiber composite loaded with nano-ZnO was prepared by a facile hot-press method and was used for the photocatalytic degradation of organic compounds as well as for microwave absorption. ZnO nanoparticles with an average size of 29 nm and polyethylene (PE) powders were dispersed on the wood fibers’ surface through a viscous cationic polyacrylamide (CPAM) solution. The reflection loss (RL) value of the resulting composite was −21 dB, with a thickness of 3.5 mm in the frequency of 17.17 GHz. The PE/ZnO/wood-fiber (PZW) composite exhibited superior photocatalytic activity (84% methyl orange degradation within 300 min) under UV light irradiation. ZnO nanoparticels (NPs) increased the storage modulus of the PZW composite, and the damping factor was transferred to the higher temperature region. The PZW composite exhibited the maximum flexural strength of 58 MPa and a modulus of elasticity (MOE) of 9625 MPa. Meanwhile, it also displayed dimensional stability (thickness swelling value of 9%).Keywords:wood fiber composite;photocatalytic activity;microwave absorption;thermomechanical
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Qi Tang,Kang Wang,Xiaoming Ren,Qunchao Zhang,Weiwei Lei,Tao Jiang,Dean Shi
Antibacterial polymer membranes have been widely used in many fields of our daily life. In this study, porous PA6 membrane with ZnO nanoparticles attaching on to the surface of inner pore walls is prepared. Firstly, SMA (styrene maleic anhydride copolymer) is used to graft onto the surface of ZnO nanoparticle in DMF (dimethylformamide). Then the pre-treated ZnO nanoparticles (ZnO-SMA) are added into SEBS (Styrene-ethylene-butylene-styrene copolymer)/PA6 (60/40 wt/wt) blends with co-continuous morphology. The effects of SMA molecular structure (molecular weight and maleic anhydride content) used for ZnO-SMA nanoparticles on their dispersion states in SEBS/PA6/ZnO-SMA nanocomposites are investigated. When SMA3 (MAH = 8 wt%, Mn = 250,000 g mol −1 ), which has relatively higher molecular weight and lower MAH content, is used as the pre-treating agent, ZnO-SMA3 nanoparticles tend to be dispersed at the phase interface in SEBS/PA6/ZnO-SMA nanocomposites. However, when SMA2 (MAH = 23 wt%, Mn = 110,000 g mol −1 ) with relatively lower molecular weight and higher MAH content is used, no ZnO-SMA2 nanoparticles locate at the interface but stay within PA6 phase. Porous PA6 membranes are obtained by selectively etching SEBS phase out with xylene. It can be found that porous PA6 membrane containing ZnO-SMA3 nanoparticles still exhibits much better antibacterial property (R = 3.76) toward S. aureus even at a very low ZnO content (0.5 wt%). This result should be ascribed to almost all the ZnO-SMA3 nanoparticles being exposed to the surface of inner pore walls of PA6 membrane. This work proposes an effective method to prepare porous polymer membrane with functional nanoparticles selectively located at the inner pore walls.
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Current Nanoscience
·
2024
·Vol. 20
·期 4
·543-553
·
IF 1.4
Liu Yurong,Zeng Xiaolong,Zhu Lin,Wang Cong,Geng Kuiwei,Yao Ruohe
Background: The development of high-performance piezoelectric pressure sensors with outstanding sensitivity, good linearity, flexibility, durability, and biocompatibility is of great significance for smart robotics, human healthcare devices, smart sensors, and electronic skin. Thus,
considerable progress has been achieved in enhancing the piezoelectric property of PVDF-TrFEbased composite pressure sensors by adding various ZnO nanostructures in PVDF-TrFE polymer acting as a nucleating agent and dielectric material. Aims: In this work, flexible pressure sensors with
a sandwich structure based on PVDFTrFE/ nano-ZnO composite sensing film were fabricated using a simple spin-coating method and post-annealing process, while electrospinning and high-voltage polarization processes were not adopted. Methods: Poly (vinylidene fluoride-trifluoroethylene) (PVDF-TrFE)/nano-ZnO
composite films were prepared via spin coating to fabricate flexible piezoelectric pressure sensors. ZnO nanoparticles (ZnO NPs), tetrapod ZnO (T-ZnO) and ZnO nanorods (ZnO NRs) were used as nano-fillers for piezoelectric PVDF-TrFE, to enhance the beta-crystal ratio as well as the crystallinity
of PVDF-TrFE. The structural and surface morphologies of the composite films were investigated using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Results: Among three different types of ZnO nanostructures with a concentration
range (0-7.5 wt%), the sensor with 0.75 wt% ZnO NRs nanofiller exhibits a maximum output voltage of 1.73 V under an external pressure of 3 N and a maximum sensitivity of 586.3 mV/N at the range of 0-3 N. Further, the sensor can generate a clear piezoelectric voltage under bending and twisting
deformation as well as compression and tensile deformation. Conclusion: To summarize, the addition of different concentrations of nano-ZnO can remarkably improve the piezoelectric performance of the composite sensor, and ZnO NRs can achieve better piezoelectric properties of the sensor
as compared to ZnO NPs and T-ZnO. In addition, the sensor with 0.75 wt% ZnO NRs as nanofiller has the highest piezoelectric response, which is about 2.4 times that of the pure PVDF-TrFE sensor. It is demonstrated that the sensor has great potential applications in wearable health monitoring
systems and mechanical stress measurement electronics.
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TALANTA
·
2018
·
IF 4.244
Linlin Xu,Hua Zhang,Yue Tian,Anxin Jiao,Feng Chen,Ming Chen
The prospect of wielding surface-enhanced Raman spectroscopy (SERS) as a powerful technique for ultrasensitive detection of organic molecules in wastewater has received extensive attention in environmental surveillance. Based on ultraviolet (UV, 405 nm) laser irradiation of ZnO nanorods in HAuCl 4 solution, ZnO@Au nanorods with controllable Au nanoparticles were successfully fabricated and established as an advanced SERS-based substrate. The reduction of Au ions was driven by the generation of electron-hole pairs via UV laser excitation of semiconductor-based nanomaterials , resulting in the moderate overgrowth of Au nanoparticles on the ZnO nanorods. The Au composition-dependent SERS analysis of crystal violet (CV) molecules revealed that the ZnO@Au nanorods with 16.21% Au contents exhibited optimized SERS activity in comparison with other nano-substrates in this paper. Furthermore, the detection limit of light-resistant methyl blue (MB) dye molecules was achieved at nanomole (nM) level of 10 −9 M (0.8 μg/L), providing ultrasensitive detection of organic pollution in wastewater. Even after twenty recycles, the excellent reusability of this novel substrate with 65% original SERS intensity was achieved by subsequently eliminating the residual MB molecules via photocatalytic degradation. Therefore, the as-prepared ZnO@Au nanorods can serve as a cost-effective, clean, reusable and active SERS substrate for ultrasensitive monitoring of light-resistant organic pollutant in natural ecosystems.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Yong Xia,Libo Zhao,Yunyun Luo,Rahman Hebibul,Jiuhong Wang,Lei Li,Guoxi Luo,Xiangyang Zhou,Zhuangde Jiang
Unlike previous work generally adopting high temperature annealing (≥500 °C) to suppress defects in hydrothermal grown ZnO, this work suppressed ZnO defects by optimizing overall process parameters of low temperature electrospinning-hydrothermal hybrid process (≤300 °C) with Taguchi method and Analysis of Variance (ANOVA). Sum ratio of defect peaks to eigen peaks (SRDE) in room-temperature photoluminescence (PL) spectrum was proposed to evaluate defect conditions in 27 experiments (L 27 (3 8 )). With the optimal process, good crystal quality (SRDE = 0.31) was achieved at low temperature (200 °C), of which the SRDE decreased by 68.04% compared with the initial counterpart. Then confirmation experiment was conducted to validate the selected levels, and results of signal-to-noise ratio (SNR) showed good agreement with the predicted ones. Besides, the response time and recovery time of the ZnO photodetectors with optimal process were decreased by 72.5% and 79.3%, respectively, compared with the initial ones. This method can also be used to fabricate ZnO materials with other wanted defect features.
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POLYMER COMPOSITES
·
2025
·
IF 4.7
Yujing Li,Yongke Tan,Weibo Zhou,Zhengchuan Hu,Yuhui Ao,Ming Li
With the rapid development of communication and electronic devices, it is desirable for carbon fiber (CF) reinforced composites exhibiting good mechanical properties and electromagnetic shielding performance simultaneously. Graphene oxide (GO)/ZnO/DSPE heterogeneous structure has been designed and prepared for enhancing mechanical strength and electromagnetic shielding properties of carbon fiber reinforced plastics (CFRP). Zinc oxide nanowires (ZnO NWs) uniformly, firmly, and vertically aligned on the surface of CF assisted by GO and polymer film phospholipid-polyethylene glycol (DSPE). The flexural strength (945.3 MPa), flexural modulus (75.5 GPa) and interlamellar shear strength (92.9 MPa) of the modified composite were increased by 71.8%, 90.2%, and 93.5%, respectively, compared with the untreated composites. Moreover, the CF composite also showed a strong electromagnetic absorption capacity; its electromagnetic shielding efficiency reached 42.89 dB, compared to the original fiber composite, increased by 65.40%. The enhancement could be attributed to a more conductive path in the composites originating from GO nanosheet and DSPE, effective reflection of vertical alignment ZnO on CF.
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Polymer-Plastics Technology and Materials
·
2018
·
IF 0
Ying Pan,Hongting Zhao
A hybrid coating containing zinc oxide (ZnO) nanoparticles, polyethyleneimine and sodium alginate was fabricated on the surface of polyethylene terephthalate (PET) fabric using layer-by-layer (LbL) self-assembled method. The construction of ZnO based coating on the surface of PET fabric resulted reduced DTG peak value compared with that of pure PET. Compared with the pure PET fabric, 4 bilayers coating obviously improved the fire resistance of PET fabric, as evidenced by the obvious reduction (39%) of peak heat release rate. UV transmission intensities of ZnO coated PET fabrics are lower at 320–400 nm than that of pure PET fabric.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yandong Xu,Wenhao Su,Zihui Jing,Zhouyu Jiang,Mingliang Wang
The development of highly active photocatalysts for H 2 O 2 production is of significant practical importance for addressing environmental issues and energy shortages. In this study, an S-scheme heterojunction photocatalyst with strong redox performance was synthesized through the in-situ growth of the TpPa-Cl covalent organic framework (COF) material on the surface of Cu-loaded ZnO nanorods. The incorporation of Cu disrupts the charge shielding effect of ZnO, promotes the spatial separation of charge carriers, and enhances piezoelectric catalytic activity. Furthermore, the porous ultra-thin COF layer extends carrier lifetime and increases the contact area with reactants, endowing the composite with strong light absorption capacity and excellent oxygen reduction performance. Under the combined influence of the piezoelectric-photocatalytic dual electric field, the H 2 O 2 yield of the composite in pure water reached 1838.8 μmol g −1 h −1 , and the resulting H 2 O 2 solution can be directly utilized for pollutant removal and water disinfection. In situ X-ray photoelectron spectroscopy, density functional theory calculations, and electron spin resonance studies elucidate the S-scheme electron transfer mechanism, which accelerates the transfer of photogenerated carriers and enhances the utilization of electron-hole pairs. This research offers a novel approach for the design and development of catalysts aimed at efficient H 2 O 2 production.
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