JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Weiqiang Li,Qixiu You,Jingjing Zhang,Wen Li,Hengyi Xu
Green synthesis of antibacterial metal oxide nanoparticles is attractive for develop novel antibacterial agents. In this study, probiotic strain Lactobacillus plantarum ZDY2013 fermentation liquid (LFL) was utilized for the synthesis of zinc oxide nanoparticles (called as LFL-ZnO) via an ultrasound-microwave-facilitated procedure. SEM and TEM show the synthesized LFL-ZnO with a spherical morphology that are surrounded by LFL. Zeta potential and hydrodynamic sizes were − 25.533 ± 0.205 mV and 537.5 nm by dynamic light scattering (DLS) analyzer, respectively. X-ray diffraction (XRD) results revealed the hexagonal wurtzite structure of LFL-ZnO with a crystallite size of 41 nm. Fourier transform infrared (FTIR) spectrum and thermal gravimetric (TG) curve showed the structure differences between H-ZnO (synthesized by ddH 2 O instead of LFL) and LFL-ZnO. In addition, LFL-ZnO significantly inhibited the growth of methicillin-resistant Staphylococcus aureus (MRSA) with MIC = 100 μg/mL. The possible antibacterial mechanisms may be attributed to LFL-ZnO release a high concentration of Zn 2+ inducing the destruction of bacterial cell integrity resulting in the leakage of protein and reducing sugars. Meanwhile, CLSM results demonstrate the generation of reactive oxygen species (ROS) by LFL-ZnO is another important antibacterial mechanism. The synthesized LFL-ZnO has broad potential to be developed in pharmaceutics as an effective antimicrobial nanomaterial .
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
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IF 8.4
Dandi Zhou,Zhanjia Kang,Xiaohua Liu,Weiyu Yan,Haolin Cai,Jiaqiang Xu,Dongzhi Zhang
A Quartz crystal microbalance (QCM) ammonia sensor with ZnO nanoflowers (NFs) doped with cellulose acetate nanofiber (CA) nanofibers and polyaniline-modified nanocomposites (CA/PANI/ZnO) is presented in this paper. The CA/PANI composite was firstly produced by electrostatic spinning and further oxidative polymerization, and then three-dimensional self-assembled ZnO NFs was synthesized by further solvothermal method , and the two were blended to obtain the ternary CA/PANI/ZnO composite with high specific surface area. The morphology and elemental composition of the fabricated composite nanomaterials were tested and analyzed by a series of characterization techniques. The experimental results showed that the QCM sensor based on CA/PANI/ZnO composite nanomaterials at room temperature exhibited good performances over a wide range of ammonia concentrations (1–70 ppm), such as high sensitivity (4.54 Hz/ppm), short response recovery time (15 s/10 s), high linearity and high selectivity. The electrical parameters of the sensor are obtained by the impedance analyzer, and the quality factor is further calculated. The potential synergistic interaction between the composites is the key for ammonia adsorption. The results show that the sensor is expected to be a potential candidate for ammonia detection.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Hao Lv,Xinsu Zhang,Lulu Zhang,Yixuan Liu,Chong Geng,Shu Xu
The intrinsic hydrophilicity of ZnO nanocrystals (NCs) leads to their incompatibility with organic media. Current methods for hydrophobization of ZnO NCs involve complex processes, which hinder their mass production and application. In this work, we propose a mixed-ligand strategy for synthesis of size-controlled hydrophobic ZnO NCs by oxidation of organometallic zinc precursor in the presence of amine and trioctylphosphine oxide (TOPO). Growth kinetic study reveals the dual role of TOPO in accelerating the nucleation and inhibiting the growth of ZnO NCs, demonstrating the importance of TOPO dosage to rapid synthesis of ZnO NCs. Other factors governing the growth kinetic are systematically investigated to optimize the synthesis control for wide range of size tunability. Finally, monodispersed hydrophobic ZnO NCs with the size of 2–13 nm are produced through microfluidic reactor, and one “synthesis run” takes 3–30 min. The hydrophobic ZnO NCs exhibit superior photocatalytic performance than the hydrophilic ones in degradation of Sudan dyes, which is attributed to its strong affinity to the dye molecules. We expected the synthesis strategy will promote the development and applications of hydrophobic ZnO NCs in various fields of photocatalysis , sensors, and optoelectronics .
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
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IF 8.4
Yue Sun,Zhuo Liu,Yuchi Zhang,Le Han,Yan Xu
Doping noble metals into semiconductor based gas sensors was proved to be an effective strategy in improving gas response properties. Here, we report a silver/silver (II) oxide nanoparticles (Ag/AgO NPs) modified highly porous ZnO nanocomposite . Firstly, the Ag NPs were evenly deposited on the surface of flower-like ZnCO 3 precursors through a simple photochemical reduction method, which was then heated at 400 °C to give highly porous Ag/AgO/ZnO nanocomposite, accompaning with the dissociation of ZnCO 3 after release of CO 2 . The interleaving ultrathin and porous sheet-like features of Ag/AgO/ZnO nanocomposite afford it excellent triethylamine (TEA) sensing performance with R a /R g = 90.3 at an operating temperature of 240 °C, and the response sensitivity is 5.5-fold higher than that of pure ZnO. Specifically, the porous Ag/AgO/ZnO nanocomposite exhibited a fast response/recovery time of 53 s/8 s and oustanding long-term cyclic stability. The enhanced gas sensing performance can be attributed to the sensitization of Ag/AgO NPs, significantly increasing the number of oxygen vacancies and thus providing more reactive sites. The synergistic interaction between Ag/AgO NPs and porous ZnO nanosheets also facilitates a fast electron transport and a high permeability for gas molecules. This work displays a feasible way of coupling photochemical reduction and pyrolysis strategy to develop highly porous ZnO nanosheets functionalized by noble metal NPs with remarkably enhanced gas response property.
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DIAMOND AND RELATED MATERIALS
·
2023
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IF 4.1
Huanhuan Xu,Lan Xu,Adnan Ahmed
Nano semiconductor photocatalysts have attracted more and more attention and developed rapidly because of their high degradation efficiency, low energy consumption and non-toxic and harmless in sewage treatment . In this work, a simple three-step preparation method combining electrospinning, heat treatment and hydrothermal synthesis was applied to obtain carbon quantum dots (CQDs)-decorated ZnO heterostructure nanoflowers grown on nanofiber membranes (NFMs), which were composed of CQDs-decorated ZnO nanorods . The morphology, structure, chemical composition and properties of nanocomposites were characterized by using scanning electron microscopy, transmission electron microscopy , Fourier transform infrared spectroscopy, X-ray diffraction spectroscopy, X-ray photoelectron spectroscopy, UV–Vis-NIR spectrometer and fluorescence spectrometer, determining the formation of CQDs-decorated ZnO heterostructure nanoflowers and the optimum experimental parameters. Moreover, the photocatalytic degradation mechanism was further revealed by the Mott-Schottky test and active radical capture experiment. The results demonstrated that when the addition amount of CQD solution was 300 μL, the produced NFMs with CQDs-decorated ZnO had the best light absorption performance, leading to its best degradation effect on methylene blue (degradation efficiency over 88 %, 4 h) under natural sunlight irradiation.
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Wood Material Science & Engineering
·
2023
·
IF 2.2
Gang Zhu,Hui Li,Shuduan Deng,Chaoling Zhang,Kunyong Kang
Construction of metal oxide nanoparticles on ZIF-8 has produced many novel hybrid materials with interesting properties, of which ZnO-ZIF-8 is a typical representative. However, due to the powdered crystalline state of ZnO-ZIF-8 hybrid materials, their processability and handling remain a significant challenge. In this work, a multifunctional ZnO-ZIF-8/bamboo composite was successfully fabricated through in-situ growth of spherical ZnO-ZIF-8 hybrid nanoparticles within natural bamboo substrates. At a 6.8 wt% ZnO-ZIF-8 loading, the resulting composite displays highly removal efficiency up to 97.6% for methylene blue (MB) and the adsorption capacity can reach 226.7 mg·g−1 at 298 K. The MB removal efficiency dropped to 96.0% after five cycles, revealing the composite exhibited an excellent recyclability. Furthermore, the introduction of ZnO-ZIF-8 remarkably enhanced the thermal stability and flame retardancy of the natural bamboo. Compared with the untreated natural bamboo, the peak of heat release rate of the ZnO-ZIF-8/bamboo composite exhibited a drastic decline by 61.6% from 45.3 W·g−1 to 17.4 W·g−1 and the total heat release from 7.6 kJ·g−1 to 4.4 kJ·g−1. This work offers a new avenues for designing and constructing functionalized MOFs@bamboo composite that may boost their environmental- and green building-related applications.
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Nanomaterials
·
2023
·Vol. 13
·期 3
·443
·
IF 5.3
Jun Wang,Bo Gao,Dongliang Liu,Lin Cheng,Yu Zhang,Dingze Lu,Huawa Yu,Aimin Chen,Shun Yuan,Kaijia Chen,Shiguang Shang
Supported nanostructured photocatalysis is considered to be a sustainable and promising method for water pollution photodegradation applications due to its fascinating features, including a high surface area, stability against aggregation, and easy handling and recovery. However, the preparation and morphological control of the supported nanostructured photocatalyst remains a challenge. Herein, a one-step hydrothermal method is proposed to fabricate the supported vertically aligned ZnO nanosheet arrays based on aluminum foil. The morphologically controlled growth of the supported ZnO nanosheet arrays on a large scale was achieved, and the effects of hydrothermal temperature on morphologic, structural, optical, and photocatalytic properties were observed. The results reveal that the surface area and thickness of the nanosheet increase simultaneously with the increase in the hydrothermal temperature. The increase in the surface area enhances the photocatalytic activity by providing more active sites, while the increase in the thickness reduces the charge transfer and thus decreases the photocatalytic activity. The influence competition between the area increasing and thickness increasing of the ZnO nanosheet results in the nonlinear dependence between photocatalytic activity and hydrothermal temperature. By optimizing the hydrothermal growth temperature, as fabricated and supported ZnO nanosheet arrays grown at 110 °C have struck a balance between the increase in surface area and thickness, it exhibits efficient photodegradation, facile fabrication, high recyclability, and improved durability. The RhB photodegradation efficiency of optimized and grown ZnO nanosheet arrays increased by more than four times that of the unoptimized structure. With 10 cm2of as-fabricated ZnO nanosheet arrays, the degradation ratio of 10 mg/L MO, MB, OFL, and NOR was 85%, 51%, 58%, and 71% under UV irradiation (365 nm, 20 mW/cm2) for 60 min. All the target pollutant solutions were almost completely degraded under UV irradiation for 180 min. This work offers a facile way for the fabrication and morphological control of the supported nanostructured photocatalyst with excellent photodegradation properties and has significant implications in the practical application of the supported nanostructured photocatalyst for water pollution photodegradation.Keywords:supported nanostructured photocatalyst;ZnO nanosheet array;morphological control;one-step hydrothermal fabrication
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Panpan Chen,Tian Hang
ZnO, as an important semiconductor, has been extensively studied for a wide range of applications. To date, with the development of micro/nano manufacturing technology, various hierarchical ZnO nanostructures have been fabricated and explored, showing encouraging success in advanced photodetectors. ZnO nanotube structure has a high surface-to-volume ratio, and versatile hollow channels, which are promising for sensing applications. Typical nanotube arrays primarily rely on advanced nanofabrication technologies. Simple and low-cost fabrication strategies are still lacking. Herein, we report a simple template fabrication method to obtain vertically aligned ZnO nanotube arrays. Using flexible, etched polyimide membranes as the template, ZnO nanotube arrays can be prepared in situ by dip-coating the sample into a zinc acetate solution followed by heating. Different hierarchical ZnO nanotube structures were obtained with the nanotube arrays when the method was combined with hydrothermal growth. We have demonstrated that the structures may be used in flexible and transparent photodetectors. Our work provides a facile approach for fabricating ZnO nanotube arrays and expands the application of ZnO nanotube structures to flexible and transparent photodetectors.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
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IF 24.319
Guiming Xie,Rongrong Jin,Pengju Ren,Yunming Fang,Runduo Zhang,Zhou-jun Wang
Boosted CO 2 hydrogenation to methanol was achieved by introducing appropriate amount of Au into conventional Cu-based catalysts. The Au x Cu/ZnO bimetallic catalysts with various Au/Cu molar ratio (x = 0.001, 0.005, 0.02 and 0.05) were prepared by the co-precipitation method, among which the Au 0.005 Cu/ZnO catalyst exhibited the highest methanol production rate. The formation of Au-Cu alloy was identified on the Au x Cu/ZnO bimetallic catalysts. Experimental characterizations and density functional theory (DFT) calculations suggested metal-oxide interfaces with oxygen vacancies as intrinsic active sties for both un-promoted and Au-promoted Cu/ZnO catalysts. The promotion effect of Au in bimetallic catalysts was correlated with the increase of active sites, facilitation of CO 2 activation and modification of intermediate adsorption. The present work for the first time develops a promising Au 0.005 Cu/ZnO bimetallic catalyst with trace amount of Au (only 0.4 wt%) and provides insight into the reaction mechanism over Au-promoted Cu/ZnO catalysts for methanol synthesis via CO 2 hydrogenation.
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Nanomaterials
·
2023
·Vol. 13
·期 1
·214
·
IF 5.3
Liyun Yan,Jiahui Tang,Qing-an Qiao,Honglan Cai,Yuqi Dong,Juan Jin,Yanbin Xu,Hongwei Gao
Bi2MoO6was one of the important bismuth-based semiconductors with a narrow bandgap, and has been widely used in selective oxidation catalysts, supercapacitors, and energy-storage devices. A series of Bi2MoO6/ZnO composite photocatalysts with different mass ratios were synthesized by the hydrothermal method. The synthesized samples were characterized by XRD, PL, UV-Vis, SEM, TEM, XPS, and BET analysis techniques. Under visible light conditions, Methylene blue (MB) was used as the target degradation product to evaluate its photocatalytic performance. The results showed that the degradation rate constant of Bi2MoO6/ZnO (0.4-BZO) was about twice that of the traditional photocatalysis of ZnO. The Bi2MoO6/ZnO composite catalyst maintained stable performance after four consecutive runs. The high photocatalytic activity of Bi2MoO6/ZnO was attributed to the efficient electron transport of the heterojunction, which accelerates the separation of electron-hole pairs and reduces the probability of carrier recombination near the Bi2MoO6/ZnO heterojunction. Bi2MoO6/ZnO nanocomposites have potential applications in the field of photodegradation.Keywords:Bi2MoO6/ZnO nanocomposites;photocatalyst;degradation
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Crystals
·
2023
·Vol. 13
·期 2
·264
·
IF 2.7
Zhenying Chen,Xiuqing Cao,Yuyang Huang,Shuang Zhang,Wenjian Pan,Wen Deng
Ti-doped ZnO (TZO) and Bi2O3thin films were designed and deposited by magnetron sputtering successively on ITO glass substrate to form a Ti-doped ZnO/Bi2O3(TZO/Bi2O3) heterojunction. Microstructure and photoelectric properties of TZO, Bi2O3, and TZO/Bi2O3films were tested and characterized. The results showed that TZO film with a hexagonal wurtzite structure was preferentially grown along the crystal plane (002), had a good crystallization state, and was an N-type semiconductor film with high transmittance (90%) and low resistivity (4.68 × 10−3Ω·cm). However, the Bi2O3film sputtered in an oxygen-containing atmosphere and was a polycrystalline film that was preferentially grown along the crystal plane (111). It had a lower crystallization quality than TZO film and was a P-type semiconductor film with low transmittance (68%) and high resistance (1.71 × 102Ω·cm). The I–V curve of TZO/Bi2O3composite films showed that it had an obvious heterojunction rectification effect, which indicates that the PN heterojunction successfully formed in TZO/Bi2O3films.Keywords:TZO film;Bi2O3film;TZO/Bi2O3heterojunction;magnetron sputtering;optoelectronic properties
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2022
·Vol. 24
·期 46
·28530-28539
·
IF 3.945
Yong-Hui Zhang,Ying-Ying Li,Xuan-Yu Yang,Fei-Long Gong,Jun-Li Chen,Ke-Feng Xie,Hao-Li Zhang,Shao-Ming Fang
Metal oxide sensors face the challenge of high response and fast recovery at low operating temperatures for the detection of toxic and flammable hydrogen sulfide (H2S) gases. Herein, novel In-doped ZnO with a sunflower-like structure and tunable surface properties was rationally synthesized. The substitutional In atom in the ZnO crystal can dramatically enhance the concentration of oxygen vacancies (Ov), the In–ZnO sites are responsible for fast recovery, and the formation of sub-stable sulfide intermediates gives rise to the high response towards H2S. As a result, the response of the optimized 4In–ZnO sensor is 3538.36 to 50 ppm H2S at a low operating temperature of 110 °C, which is 106 times higher than that of pristine ZnO. Moreover, the response time and recovery time to 50 ppm H2S are 100 s and 27 s, respectively, with high selectivity and stability. First-principles calculations revealed that 4In–ZnO with rich Ov exhibited higher adsorption energy for the H2S molecule than pristine ZnO, resulting in effortless H2S detection. Our work lays the foundation for the rational design of highly sensitive gas sensors through precise doping of atoms in oxygen-rich vacancies in semiconductor materials.
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