MATERIALS RESEARCH BULLETIN
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2023
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IF 5.4
Meijing Ning,Ke Zhao,Lijia Zhao,Sheng Cao,Jialong Zhao,Yonghui Gao,Xi Yuan
ZnO nanoparticles (NPs) are considered the most promising materials for electron transport layer (ETL) in quantum dot light-emitting diodes (QLEDs). Herein, we employed a synergistic strategy of Mg doping and ZnMgO shell coating to modify the defect states and energy levels of ZnO NPs. Mg doping mitigated the exciton luminescence quenching caused by charge transfer. A ZnMgO shell was also applied to coat the Mg-doped ZnO (ZMO) NPs to passivate surface oxygen defects further. Consequently, QLEDs utilizing ZMO@ZnMgO ETL demonstrate external quantum efficiency and maximum current efficiency of 9.0 % and 11.5 cd A −1 . This work shows an effective defect passivation strategy to enhance the performance of red-emitting InP-based QLEDs.
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Chem Catalysis
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2023
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IF 9.4
Rong Wang,Yue Peng,Jane Chung,Zhen Chen,Xiyang Wang,Haibo Yin,Yimin A. Wu,Jingshan Luo,Junhua Li
Summary The electrocatalytic reduction of CO 2 is an attractive method for reducing greenhouse gases and producing chemical feedstocks. However, the activation of C=O bonds limits the reaction kinetics; therefore, understanding the mechanism of C=O bond activation can guide the design of high-performance catalysts. Here, we investigate the C=O bond activation mechanism during the electroreduction of CO 2 to CO on ZnO. Using in situ experimental techniques and quantum chemical calculations , we find that defects in ZnO promote the formation of Zn–ZnO x interfaces during CO 2 reduction, which mediates an intimate-junction exciton state by the metal semiconductor heterophase. This promotes the formation of CO 2 radicals, exposing electron donation centers for CO 2 adsorption and redox centers for cleaving stable C=O bonds. The internal electric field generated by the heterojunction enhances the initial C=O activation by facilitating the interaction between the metalized Zn d-orbital and the O π -orbital in CO 2 .
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ACS Applied Nano Materials
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2023
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IF 5.9
Hanlin Li,Xiaohui Fang,Chen Kang,Zhoutao Sun,Hongmei Liu,Xinping Zhang
Rapid trace gas identification is challenging due to the low adsorptivity of gaseous molecules on solid substrates under ambient conditions. In this article, we present a gas sensor utilizing a capillary serving as a surface-enhanced Raman scattering (SERS) probe. The capillary is decorated with densely distributed Ag/ZnO nanocomposites within its microchannel, resulting in an enlarged specific surface area that enhances gas adsorption and chemical enhancement and provides abundant SERS hotspots. The introduction of gas into the capillary leads to the immediate appearance of distinctive Raman characteristic peaks, and the entire measurement process can be performed under ambient conditions. The detection limit for gases of NO2 and SO2 reaches as low as 0.1 ppb. Furthermore, the sensor exhibits the capability to identify components of mixed gases as well as effectively detect NO2 in vehicle exhaust emissions. With all of these advantages, the SERS-active capillary demonstrates promising potential for practical applications, particularly in the rapid and accurate identification of trace-level gases.
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ACS Applied Materials & Interfaces
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2023
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IF 9.5
Nitong Bu,Lin Wang,Di Zhang,Huimin Xiao,Xiaoman Liu,Xianrui Chen,Jie Pang,Chen Ma,Ruojun Mu
Biodegradable gelatin (G) food packaging films are in increasing demand as the substitution of petroleum-based preservative materials. However, G packaging films universally suffer from weak hydrophobicity in practical applications. Constructing a hydrophobic micro/nanocoating with low surface energy is an effective countermeasure. However, the poor compatibility with the hydrophilic G substrate often leads to the weak interfacial adhesion and poor durability of the hydrophobic coating. To overcome this obstacle, we used (3-aminopropyl) triethoxysilane (APS) as an interfacial bridging agent to prepare a highly hydrophobic, versatile G nanocomposite film. Specifically, tannic acid (TA)-modified nanohydroxyapatite (n-HA) particles (THA) were introduced in G matrix (G-THA) to improve the mechanical properties. Micro/nanostructure with low surface energy composed of nanozinc oxide (Nano-ZnO)/APS/stearic acid (SA) (NAS) was constructed on the surface of G-THA film (G-THA/NAS) through one-step spray treatment. Consequently, as-prepared G-THA/NAS film presented excellent mechanics (tensile strength: 7.6 MPa, elongation at break: 292.7%), water resistance ability (water contact angle: 150.4°), high UV-shielding (0% transmittance at 200 nm), degradability (100% degradation rate after buried in the natural soil for 15 days), antioxidant (78.8% of 2,2-diphenyl-1-picrylhydrazyl radical scavenging activity), and antimicrobial (inhibition zone against Escherichia coli: 15.0 mm and Staphylococcus aureus: 16.5 mm) properties. It should be emphasized that the bridging function of APS significantly improves the interfacial adhesion ability of the NAS coating with more than 95% remaining area after the cross-cut adhesion test. Meanwhile, the G-THA/NAS film could maintain stable and long-lasting hydrophobic surfaces against UV radiation, high temperature, and abrasion. Based on these multifunctional properties, the G-THA/NAS film was successfully applied as a liquid packaging material. To sum up, we provide a feasible and effective method to prepare high-performance green packaging films.
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高影响因子
Journal of Materials Chemistry A
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2023
·Vol. 11
·期 42
·22859-22867
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IF 11.9
Jinhong Yang,Haoran Peng,Chong Lin,Qingjiang Pan,Lixue Qi,Li Li,Keying Shi
To overcome the drawbacks of low sensitivity and limited selectivity exhibited by metal oxide sensitive materials, a metal–organic framework (MOF) derived composite (marked as UZZ) was constructed via a combined wet chemical method. UiO-66 was used as the precursor with the introduction of ZnO. The ZrO2 component in UZZ retains the unique octahedral configuration of UiO-66; on its folded surface, a large number of ZnO particles grow, whose sizes range from 20 to 40 nm. The composite exhibits excellent gas sensitivity to NO2 at room temperature. Exemplarily, the gas sensitive response to 100 ppm NO2 is 40.35, with a response time of 1.4 s and a detection limit as low as the 50 ppb level, and the stability is up to 8 weeks. The presence of numerous oxygen vacancies and n–n type heterojunctions on the surface of the UZZ composite synergistically enhances the gas-sensing performance. This finding provides a significant reference for developing new efficient and high-sensitivity metal oxide sensitive materials based on MOFs.
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Chemical Engineering and Processing-Process Intensification
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2023
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IF 4.3
Mohammad Zahir Akbari,Yifeng Xu,Chuanzhou Liang,Zhikun Lu,Siyuan Shen,Lai Peng
Nanocomposite-based photocatalytic degradation of sulfamethoxazole (SMX) is frequently used for wastewater treatment. However, applying various nanoparticles led to different removal efficiencies and levels of environmental toxicity. Herein, we synthesized and characterized ZnO@VC to enhance the photocatalytic degradation of SMX. Effects of SMX concentration, catalyst dosage, pH, water matrix and role of reactive oxygen specious (ROS) were evaluated. Results confirmed 97.69±0.95% (5 mg L −1 SMX/0.05 g L −1 catalyst) removal efficiency followed pseudo-first-order kinetic. Higher SMX concentration and higher catalyst dosage reduced degradation efficiency because of the prevention of catalyst active-sites and limiting light availability. SMX removal efficiency was slightly reduced in synthetic wastewater (SWW) and tap water (TW) by anions scavenging ROS. Due to pH reliance of SMX anionic-density, the degradation efficiency was positively and negatively impacted by acidic and basic environment, and pH values below and over the catalyst point of zero charge (PZC), respectively. Quenching test revealed that some specious of ROS play more important role in photocatalytic degradation of SMX. Two degradation pathways of SMX photocatalytic decomposition were described. The synthesized catalyst showed good stability in terms of reusability. The results revealed that ZnO@VC with high detoxification ability (97%) could be a promising photocatalyst for treatment of antibiotics from water and wastewater.
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SURFACE & COATINGS TECHNOLOGY
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2023
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IF 5.4
Ying Liu,Lian Zhang,Jing Hu,Bo Cheng,Junlong Yao,Yong Huang,Hao Yang
Transparent superhydrophobic coating has been widely investigated for their great potential applications in self-cleaning windows, solar panels, lenses, and optoelectronic devices. Herein, we reported a robust ZnO coating with high transmittance and superhydrophobicity, which was prepared by a facile sol-gel method and post-modification with hexadecyltrimethoxysilane. To well control the surface morphology and roughness of the ZnO coating, CTAB was added in the precursor. When the concentration of Zn 2+ was 1.2 mol/L, and the ratio of CTAB/Zn 2+ was 0.1, the prepared ZnO coating showed 91.2 % transmittance at a wavelength of 600 nm. A drop of water with a near spherical shape on the coating exhibited a water contact angle of 162.0° ± 1.7° and rebounding back and forth for 7 times in 260.3 ms. Moreover, the ZnO coating shows remarkable stability against water dripping impact, sand impact abrasion and scratching test, while retaining its superhydrophobicity. Furthermore, the ZnO coating also shows self-cleaning, UV-blocking and anti-bioadhesion properties. The prepared transparent superhydrophobic ZnO coating may open a new gate to a variety of practical applications, including windshields, eyeglasses, windows for tall buildings and medical glass, ect.
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APPLIED SURFACE SCIENCE
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2023
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IF 6.7
Tingzhan Wang,Jingkun Chen,Jiaxuan Chen,Xuan Yao,Gang Chen,Zheng Jiao,Jing-Tai Zhao,Shuai Cheng,Xue-Chun Yang,Qianli Li
N-butanol gas is a common volatile organic compound (VOC) that can pose a threat to human health and pollute the atmospheric environment. However, the n-butanol gas sensors suffer from low response and selectivity. Herein, we synthesized the Ga-doped ZnO (ZOG) sensors by one-step hydrothermal treatment and subsequent calcination. The oxygen vacancies content of 1-ZOG has increased by 46 % compared to pure ZnO. Rich oxygen vacancies can increase the response signal of 1-ZOG to 174.78 in darkness for 100 ppm n-butanol, which is 2.4 times that of ZnO. Furthermore, the gas sensing performance of 1-ZOG is improved by light excitation. Under UV irradiation, the response of 1-ZOG sensor to 100 ppm n-butanol is 3.6 times that of pure ZnO, up to 636.81. Meanwhile, the response signal of 1-ZOG to n-butanol is at least 6.32 times that of other gases under UV light, showing ultra-high selectivity. This study proved that both Ga doped and photo-excited are effective strategies for improving the sensitivity and selectivity of ZnO based gas sensors.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2023
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IF 5.7
Meng Cao,Wen Bin Hong,Xiao Dong Yang,Xiao Jian Yan,Lei Li,Shu Ya Wu,Xiao Long Zhang,Xiang Ming Chen
The transportation of Zn 2+ in acetic acid (HOAc) or Zn(OAc) 2 water solution was considered crucial for the successful cold sintering of ZnO ceramics. However, our work shows that ZnO ceramics can even be densified by cold sintering with the aid of solid Zn(OAc) 2 ·2 H 2 O without introducing extra free water. DSC-TG analysis reveals that pure Zn(OAc) 2 ·2 H 2 O is dehydrated completely into solid Zn(OAc) 2 during heating in an open environment, while it melts in ZnO-Zn(OAc) 2 ·2 H 2 O mixture or a high-pressure and semi-closed circumstance due to the strongly suppressed dehydration. Consequently, molten Zn(OAc) 2 ·2 H 2 O acts as the transient liquid medium for the dissolution-precipitation process at over 100 °C, and plays a dominant role in the densification, microstructural evolution , and mechanical robustness of the cold-sintered ZnO ceramics. The densification mechanism is confirmed by the pressure-time curves, and reveals a novel strategy for cold sintering of water-insoluble ceramics by introducing molten hydrated salt or alkali as the transient liquid medium.
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CERAMICS INTERNATIONAL
·
2023
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IF 5.2
Hong-Min Cong,Zheng-Bai Zhao,Yang Wang,Xu-Dong Yang,Ye Fang,Chao Yan
The increasing demand for effective thermal management in electronic devices has highlighted the crucial importance of researching composite materials with exceptional thermal conductivity in the field of electronics. A novel hybrid filler consisting of hexagonal boron nitride (BN) and needle-like zinc oxide nanowires (ZnO NWs) was designed and synthesized in this work, then used to prepare thermally conductive composites by mixing it with polyvinyl alcohol (PVA) using the ice template method and hot-pressing process. The results demonstrated that a filler loading of 20 wt% yielded the highest thermal conductivity for the composite, reaching an impressive in-plane thermal conductivity of 1.77 Wm −1 k −1 , which was 3.4 times higher than that of the conventional frozen pure PVA. This substantial improvement in thermal conductivity is mainly attributed to the synergistic effect achieved through the ice template method to construct a conventional orientation structure combined with the presence of BN-ZnO NWs hybrid filler. In addition, this composite also has good mechanical properties and thermal stability, etc. Our study shows that the BN-ZnO NWs/PVA thermally conductive composite demonstrates excellent potential as a thermal interface material for various applications in the field of thermal management of electronic devices.
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CHEMOSPHERE
·
2023
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IF 8.8
Peng Wang,Wanqian Cai,Fangyuan Yu,Ping Zhou,Mei Lin,Cong Lin,Tengfei Lin,Min Gao,Chunlin Zhao,Xiangqi Li,Xiao Wu
The decaying photocatalytic rate caused by carrier recombination is a thorny problem that has not been properly solved. Improvement of photocatalysis can be achieved through structural innovation, diversification of catalytic modes, or a combination of both. Herein, effective separation of photo-generated carriers in Bi 0·5 Na 0·5 TiO 3 /ZnO composites was achieved by heterojunction construction for energy band regulation and synchronously mechanical energy harvesting from piezoelectric effect. The formation of heterojunctions between Bi 0·5 Na 0·5 TiO 3 and ZnO was confirmed by electron microscopy and analysis of X-ray photoelectron spectroscopy spectra. The degradation performance of Rhodamine B, a representative industrial dye contaminant, was optimized through the formation of Bi 0·5 Na 0·5 TiO 3 /ZnO heterojunctions and ultrasonic vibration harvesting. Their band structures were described in detail and electrochemical tests were performed to substantiate a novel Z-scheme heterostructure that can explain the carrier separation and transfer processes in catalysis. The piezoelectric polarization field generated by the piezoelectric effect of both Bi 0·5 Na 0·5 TiO 3 and ZnO coordinates perfectly with the photocatalysis , enabling the piezo-photocatalysis. Our research opens a promising avenue in alleviating charge carrier complexation through heterojunction construction and mechanical strain for future pollutants degradation via catalysis.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Meiran Chen,Yumin Guo,Jungu Xu,Jingjing Wu,Xin Tang
The development of heterostructure electrolytes represents a promising strategy for enhancing the performance of solid oxide fuel cells for the intermediate-temperature solid oxide fuel cell (IT-SOFC). In this work, a p–n semiconductor ZnO-SNT heterostructured electrolyte based on p-type Sr2Nb1.9Ti0.1O7–δ (SNT) and n-type ZnO nanoparticles is proposed. In addition, its structural characterization and electrochemical performance are also investigated. Particular attention is paid to the effect of the commercial ZnO particle size on the electrical conductivity. It was revealed that the resulting ZnO-SNT electrolyte exhibited a desirable heterostructure and was enriched with oxygen vacancies. Electrochemical studies demonstrated that the 6ZnO-4SNT fuel cell achieved a peak power density of 570 mW cm–2 at 550 °C, with an open-circuit voltage of 1.06 V, and an ionic conductivity of 0.163 S cm–1. Meanwhile, such optimal cell performance was yielded at an average size of 30 nm for the ZnO, which indicated that the interfacial area plays a crucial role in the ionic conductivity of the ZnO-SNT composites. Further investigation of the rectification properties showed that there was a pronounced p–n rectification effect in the ZnO-SNT heterostructure. Building upon this finding, the band alignment effect was exploited to explain the electron-blocking and ion-promoting behavior of such p–n heterojunctions. Our findings not only show that ZnO-SNT nanocomposites are promising electrolytes but also provide insights into the development of effective IT-SOFC electrolytes utilizing semiconductor heterostructure materials.
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