CHEMICAL PHYSICS LETTERS
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2020
·
IF 2.029
Xianghua Wang,Xingfu Chen,Xinjun Wang,Juntao Hu,Yihui Wu,Wen-Hua Zhang
The surface polarity of nanocrystalline ZnO film, a typical electron transport material in optoelectronics , is chemically modified using self-assembled monolayer (SAM) of phenethyl trichlorosilane (PETS). The surface treatment is proved to generate a hydrophobic surface by removing the hydroxyl groups on the oxide layer, which reduces the emission quenching of the subsequent CsPbBr 3 quantum dot film. In addition, the surface polarity was engineered with varying PETS concentration, thereby contribute to an increased photoluminescence quantum yield (PLQY) by up to 50%. Meanwhile, the thermal stability of photoluminescence was enhanced showing a wide-range temperature tolerance up to 140 °C.
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OPTICAL MATERIALS
·
2021
·
IF 3.08
Xinli Wang,Jin Li
The development of metal/semiconductor photoactive materials has progressed remarkably with respect to heterogeneous photocatalysis . In this study, pristine ZnO quantum dots (ZQ) and Ag/ZQ nanocomposites with different Ag loadings were prepared using a cost-effective method. The synthesized samples were characterized using X-ray diffraction, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and electron paramagnetic resonance analyses. Photocatalytic experiments indicated that the Ag11/ZQ nanocomposite (Ag content of 11 wt%), exhibited excellent photocatalytic activity for methylene blue degradation. A combination of ultraviolet–visible spectroscopy, photoluminescence spectroscopy, electrochemical impedance spectroscopy , time-resolved photoluminescence analyses, and analog computational analysis were employed to propose the mechanism underlying the enhanced photocatalytic activity of Ag/ZQ nanocomposites. This was attributed to the effective charge transfer to the surface-decorated Ag, which efficiently suppresses electron–hole recombination in the ZQ, as well as oxygen vacancies (V O ) on the ZQ surface provide more reactive sites. Consequently, Ag/ZQ nanocomposites are promising photocatalytic materials for the removal of organic pollutants from wastewater.
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SENSORS AND ACTUATORS B-CHEMICAL
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2021
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IF 7.46
Jinyu Huang,Hao Liang,Jiexiong Ye,Dongting Jiang,Yiling Sun,Xuejin Li,Youfu Geng,Jiaqi Wang,Zhengfang Qian,Yu Du
Au-loaded ZnO were successfully prepared by means of seed-assisted solvothermal methods. The vertically ordered nanorod arrays are uniformly grown on the Al 2 O 3 substrate. The sensing properties of ZnO and Au-loaded ZnO sensors toward HCHO were investigated. Remarkably, the sensor based on 4 wt%Au-loaded ZnO nanorod arrays exhibits high response, short response and recover times, excellent selectivity, as well as low HCHO detection limit at 70 °C. After the incorporation of Au nanoparticle, the detection limit decreases from 10 ppm to 0.25 ppm, and the response increases more than 20 times under 100 ppm HCHO at 70 °C. Moreover, the mechanism of HCHO sensing with Au-loaded ZnO was explored by the calculations obtained from the first-principle studies.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2021
·Vol. 27
·期 70
·17620-17627
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IF 5.236
Gen Liu,Xue Yu,Rui Xu,Xiaodong Zhu,Yanqing Ma,Lei Ma
Graphical The final morphology of ZnO generally involves nucleation, Ostwald ripening and self-assembly process. Herein, the nucleation experienced the Zn 2+ -layered basic zinc salts (LBZs)-ZnO process, while the self-assembled unit changed from urchin-shaped to rod-shaped and gradually a fully coupled twin-shaped structure with the increasing concentration of ammonium acetate. The whole growth process clarifies the roles of ammonium acetate in the growth mechanism of ZnO, which may further benefit the optimal synthesis of functional structures. Chemical bath deposition method has been used to synthesize a variety of ZnO morphology structures. However, the specificity and interaction of acetate and ammonium ions with ZnO crystal during the growth process remain elusive. This study contributes to understand the roles of ammonium acetate on the growth mechanism of ZnO in Zn(NO 3 ) 2 -HMTA system. The growth process indicates that the nucleation experienced Zn 2+ -layered basic zinc salts (LBZs)-ZnO process, while the self-assembled unit changed from urchin-shaped, rod-shaped to a fully coupled twin-shaped structure with increasing ammonium acetate concentration. Ammonium acetate dominates the growth process by combing the ligand-ligand interaction of acetate ions binding to the same Zn-rich (0001) polar surface and ammonium ions regulating hexamethylenetetramine (HMTA) hydrolysis. Relatively regular hexagonal wurtzite structure and a dissolve-renucleation-regrowth process which retains the twin-shaped template and renucleates at the same position are observed at ∼10 mM ammonium acetate. Photoelectrochemistry (PEC) measurements show that the uniform hexagonal ZnO rods (Y-10, the sample named as Y-x (x represents x mM ammonium acetate, herein, x is 10 mM)) have a maximum photocurrent density of 1.54 mA cm −2 at 1.23 V (vs. RHE), much higher than that of the dumbbell-shaped ZnO rods (Y-50, 0.20 mA cm −2 ) at the same voltage. These results provide a further explanation of morphology regulation mechanisms on ZnO synthesis processes and pave the road for more practical applications.
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ACS Applied Nano Materials
·
2020
·
IF 0
Jia Li,Xiang Zhu,Jianyu Wang,Zhiyan Rui,Shiqiao Zhang,Yuxin Li,Rui Ding,Wenxiang He,Jianguo Liu,Zhigang Zou
Nonprecious metal electrocatalysts (NPMEs) have been recognized as highly promising oxygen electroreduction catalysts, but improving their activity and stability in acidic electrolyte remains critical. Here, we integrated self-assembly technology induced by rotary evaporation with the hard-template method to synthesize Fe–N-codoped NPMEs with large specific surface areas and hierarchical pore structure. The presence of Fe3+ assisted complete removal of the ZnO hard template at a relatively low temperature, which is beneficial for both the in situ growth of micropores/mesopores within the carbon layers and the retention of more nitrogen-containing groups. The obtained Fe–N–C/ZnO porous carbon material exhibited outstanding oxygen reduction reaction catalytic activity, along with respectable electrochemical stability in a perchloric acid electrolyte. Applied in fuel cells, the electrocatalyst loading was reduced to 2.0 mg/cm2 because of increased mass transfer arising from the hierarchical porous structure and resulting in a power density of 700 mW/cm2.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Rui Gao,Shan Gao,Ping Wang,Yingming Xu,Xianfa Zhang,Xiaoli Cheng,Xin Zhou,Zoltán Major,Hanyue Zhu,Lihua Huo
Ionic liquid [Bmim][BF 4 ] is used as a templating agent to synthesize ZnO with snowflake morphology by hydrothermal method. Different calcination temperatures make snowflake ZnO retain different content of ionic liquid residual which results in different gas response. The mesoporous ZnO material obtained after calcination at 650 °C shows the best gas response to NO x . The sensor not only has excellent gas selectivity, but also exhibits an optimal response to NO x (S = 73.4) at 170 °C with a response range of 0.05 ∼ 10 ppm. In addition, the sensor has good repeatability and long-term stability and also exhibits good moisture resistance at different humidity levels which may be attributed to an appropriate amount of residual ionic liquid after high temperature calcination. The reaction mechanism of the sensor to NO x is also discussed in detail based on XPS analysis, GC–MS measurement and DFT calculations.
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BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
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2019
·Vol. 103
·期 6
·802-807
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IF 1.65
Du Jingjing,Guo Ruilin,Li Ke,Ma Bingbing,Chen Yan,Lv Yanna
In this work, we assessed the toxic effects of ZnO nanoparticles (NPs; 1, 10, and 50 mg L −1 ) and the corresponding dissoluble Zn ions (0.71, 8.66, and 35.59 mg L −1 ) on Microcystis aeruginosa . After chronic exposure (28 days), significantly higher growth inhibition was observed under ZnO NPs at 1 mg L −1 (47%) than under Zn ions at 0.71 mg L −1 (−15%). The opposite effect pattern was observed for ZnO NPs at 10 (71% vs. 80%) and 50 mg L −1 (73% vs. 95%) compared to Zn ions at the corresponding concentrations. After 7 days of exposure, ZnO NPs at 10 and 50 mg L −1 led to an increase of 83 and 53% in malondialdehyde content, as well as an increase of 106 and 61% in superoxide dismutase activity, respectively. However, Zn ions at the corresponding concentrations showed negligible impacts on the two parameters. The different results indicate that the insoluble NPs during the initial exposure mostly account for lipid peroxidation, which further lead to microalgal antioxidant response. During the subsequent exposure, the contributors of ZnO NP toxicity shift with the concentration and exposure time of ZnO NPs. In conclusion, the study presents new insights into the different contributions of insoluble NPs and dissoluble metallic ions to metallic NP toxicity.
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Nanotechnology Reviews
·
2019
·Vol. 8
·期 1
·315-326
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IF 2.759
Yuan Xie,Wei Wei,Fanbin Meng,Xi Qu,Jinyang Li,Li Wang,Zuowan Zhou
In response to the widespread bacterial threat, mechanical bactericidal nanostructures with various morphologies have been reported for years. However, the relationship between morphology and bactericidal properties is still yet to be elucidated due to the lack of a fair comparison under similar density of the nanostructures. For this purpose, an electrical-field assisted hydrothermal growth method were utilized to prepare the ZnO nanoarrays with similar array density (1.9×10 9 rod·cm 2 -2.4 ×10 9 rod·cm 2 ) but gradient morphologies from hexagonal prism, hexagonal prismoid to hexagonal pyramid on stainless steel sheets. Moreover, in dark condition, a bactericidal activity was observed on the ZnO nanoarray surfaces within 30 min contact for both E. coli and S. aureus cells. The bactericidal rate was rapidly enhanced as the average tip width of the nanorods decreasing from 137 to 38 nm. These results suggest that the hexagonal pyramid ZnO nanoarrays have a rapid, efficient and broad-spectrum bactericidal activity, which could contribute to the next-generation aquatic pathogens control strategies.
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RSC Advances
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2019
·Vol. 9
·期 66
·38772-38782
·
IF 3.049
Danya Huang,Ying Zhang,Jingjing Zhang,Hongli Wang,Minggang Wang,Chen Wu,Daowen Cheng,Yue Chi,Zhankui Zhao
The design and synthesis of an efficient adsorbent for antibiotics-based pollutants is challenging due to the unique physicochemical properties of antibiotics. The development of a mesoporous SiO2–ZnO composite is a novel way to achieve excellent adsorption efficiency for doxycycline hydrochloride (DOX) in aqueous solutions due to the engineered highly open mesoporous structure and the ZnO-modified framework. Unlike the traditional method of obtaining mesoporous composites by post-synthesis techniques, the novel one-step method developed in this study is both effective and environment-friendly. The adsorption mechanism based on the novel synergetic effect between SiO2 and ZnO was demonstrated through several experiments. SiO2 led to the creation of a 3D open framework structure that provides sufficient space and rapid transport channels for adsorption, ensuring rapid adsorption kinetics. A higher number of active sites and enhanced affinity of the contaminants are provided by ZnO, ensuring high adsorption capacity. The mesoporous SiO2–ZnO could be easily regenerated without a significant decrease in its adsorption efficiency. These results indicate that the developed strategy afforded a simple approach for synthesizing the novel mesoporous composites, and that mesoporous SiO2–ZnO is a possible alternative adsorbent for the removal of DOX from wastewater.
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ACS Applied Bio Materials
·
2019
·
IF 0
Siying Tang,Zhe Wang,Wan Li,Miao Li,Qiuhong Deng,Yi Wang,Chengyong Li,Paul K. Chu
ZnO nanoparticles (ZnONPs) are synthesized and incorporated into soybean protein isolate (SPI) to obtain SPI/ZnONPs (SZ) films, and the morphology, size distribution, and stability are determined. The effects of different contents of ZnONPs in the SZ films on the oxygen barrier, antibacterial activity, and thermal and mechanical properties are evaluated. A ZnONPs content of 0.2% in the SZ films improves the tensile strength and microbial inhibition by 231% and 16%, respectively. The thermal stability and oxygen barrier properties of the SZ films are also enhanced with addition of ZnONPs. The ZnONPs dispersed uniformly in the SPI film enhance the interactions between SPI molecules via hydrogen bonding, and the results suggest potential application of ZnONPs in food packaging.
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MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Lei Huang,Zhihui Yang,Yujun Shen,Peng Wang,Baocheng Song,Yingjie He,Weichun Yang,Haiying Wang,Zhenxing Wang,Yongsheng Chen
Coordination bonds of ligands and metal ions are generally considered for improving agglomeration during the synthesis of metal oxides . However, the strong interactions always limit the performance due to the requirement of additional energy and calcination . A new strategy of synthesizing ZnO particles is proposed through a hydrothermal inducing redox method by using 2-methyl imidazole and Zn(NO 3 ) 2 . In situ direct redox between this organic ligand and NO 3 − in a hydrothermal condition is confirmed radical change instead of the simple coordination between organic ligands with Zn 2+ in traditional method. The directly acquired ZnO particles possessing uniform dumbbell-like morphology have no obvious agglomeration. The yield reaches >95%. In particular, the synthesis mechanism and morphology evolution during the ZnO aggregates growth were carefully explored and proposed. Density functional theory (DFT) and surface energy calculations demonstrated the effects of activity variation of reactive groups and preferred growth surface of ZnO crystals. This work gives new insights into new synthesis strategy of ZnO particles via hydrothermal condition.
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ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 42
·1903774
·
IF 15.621
Zhongliang Huang,Longlong Fan,Feigang Zhao,Bin Chen,Kaiji Xu,Shu-Feng Zhou,Jinli Zhang,Qingbiao Li,Dan Hua,Guowu Zhan
Hybrid metal oxides with multilayered structures exhibit unique physical and chemical properties, particularly important to heterogeneous catalysis. However, regulations of morphology, spatial location, and shell numbers of the hybrid metal oxides still remain a challenge. Herein, binary Co 3 O 4 /ZnO nanocages with multilayered structures (up to eight layers) are prepared via chemical transformation from diverse Matryoshka-type zeolitic imidazolate frameworks (ZIFs) via a straightforward and scalable calcination method. More importantly, the obtained ZIF-derived metal oxides (ZDMOs) with versatile layer numbers exhibit remarkable catalytic activity for both gas-phase CO oxidation and CO 2 hydrogenation reactions, which are directly related to the sophisticated shell numbers (i.e., Co 3 O 4 -terminated layers or ZnO-terminated layers). Particularly, in situ reflectance infrared Fourier transform spectroscopy (DRIFTS) results indicate that the promotional effects of the multilayered structures indeed exist in CO 2 hydrogenation, wherein the key reaction intermediates are quite different for five-layer and six-layer ZDMOs. For instance, *HCOO is the predominant intermediate over the six-layer ZDMO; on the contrary, *H 3 CO is the crucial species over the five-layer ZDMO. The ZnO/Co 3 O 4 interface should be the active sites for CO 2 hydrogenation to *HCOO and *H 3 CO species, which are ultimately converted to the products (CH 4 or methanol). Accordingly, the work here provides a convenient way to facilely engineer multilayered Co 3 O 4 /ZnO nanocomposites with precisely controlled shell numbers for heterogeneous catalysis applications.
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