Journal of Physical Chemistry C
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2019
·
IF 4.309
Jun Yuan,Liang Hu,Zhenyu Xu,Yiyue Zhang,Hui Li,Xingzhong Cao,Huawei Liang,Shuangchen Ruan,Yu-Jia Zeng
Polycrystalline film photodetectors often suffer from several drawbacks, such as uncontrollable defect species, grain boundary scattering, and surface oxygen trapping/detrapping, hindering their practical applications in high-performance UV photodetection. In this work, we induce an acceptor-type zinc vacancy (VZn) defect in zero-dimensional ZnO nanocrystals by a dual thermal annealing process, which has been closely examined by a defect-sensitive electron paramagnetic resonance technique. The optimization of annealing parameters can well tune the VZn concentration and induce a considerable self-powered behavior, which is believed to result from ionized acceptor enhanced charge separation. On the other aspect, the capping of metallic Zn can lead to the formation of abundant interface conducting channels for the highly efficient charge transport and extraction. The optimized responsivity is enhanced from 5.3 × 10–3 to 15.3 A W–1, and the average rise and decay times remain at 36.6 and 101.8 ms, respectively. Conductive atomic force microscopy confirms a uniform photocurrent distribution in the annealed polycrystalline films, suggesting the significance of synergies of lattice defects and grain boundary conductive channels. This study unambiguously demonstrates a new route to engineer the photodetection in nanocrystalline oxides, providing a promising prospect for future low-cost, low-power-consumption micro-/nano-optoelectronic devices.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2019
·Vol. 29
·期 4
·1192-1197
·
IF 1.637
Zhao YingRui,Yang Chao,Zhang HongYan,Qiang Gen,Fan HuiLing
Two kinds of ZnO/SiO 2 composite (labled as SZ-1 and SZ-2) were synthesized by sol–gel method and characterized by X-ray diffraction (XRD) patterns, XPS (X-ray photoelectron spectroscopy) spectra and Diffuse Reflectance Infrared Fourier Transform (DRIFT) spectra. Water adsorption on the prepared sample was studied by in situ DRIFT. The as-synthesized SZ-1 and SZ-2 sample have different surface property due to the various aging methods in the sample preparation processes, thus showing different results of water adsorption. The adsorption sites (Si atom in Si–O–Si bond) on the surface of SZ-2 for water molecule are occupied by the –OCH 3 group and the hydrophilicity of SZ-2 is weaker, in comparison to SZ-1, which inhibits the formation of water film and ultimately decreases desulfurization performance of SZ-2. So, the desulfurization performance can be changed by altering the hydrophilicity of sorbent.
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NEW JOURNAL OF CHEMISTRY
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2018
·Vol. 42
·期 15
·12779-12786
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IF 3.201
Hui Fang,Yanxia Guo,Tong Wu,Yuping Liu
Novel urchin-like CuO/ZnO nanocomposites were synthesized using glutamine (Gln) as a growth regulator by a biomimetic hydrothermal process with subsequent calcination. The urchin-like hierarchical structure is assembled by closely packed and inter-connected nanoparticles with sizes of 20–50 nm. Gln plays key roles in phase composition and morphology due to its competitive coordination with Cu ions and Zn ions. Compared with the prepared ZnO/CuO nanosheets without Gln and pure ZnO with Gln, the urchin-like CuO/ZnO nanocomposites exhibited the most remarkable performance for the degradation of methylene blue dye under UV irradiation. On the basis of the photocatalytic mechanism of urchin-like CuO/ZnO nanocomposites, a direct relationship among the morphology, phase composition and photocatalytic properties is established.
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Catalysts
·
2018
·Vol. 8
·期 4
·151
·
IF 3.465
Yanzhen Huang,Rongkai Li,Dongping Chen,Xinling Hu,Pengxin Chen,Zhibin Chen,Dongxu Li
Novel carbon nanotubes (CNTs)/titanium dioxide (TiO2)/zinc oxide (ZnO) composites have been successfully synthesized via a two-step solution method using titanyl sulfate as the titanium precursor. Its structural performances were researched by various characterization methods, such as X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and UV-vis diffuse reflectance spectroscopy (UV-vis DRS). The performance of the composites was tested by degrading rhodamine B (RhB) under UV-vis illumination and found to strongly rely on the content of ZnO. The experimental results showed that the CNT/TiO2/ZnO-90 wt % expressed more outstanding photocatalytic performance compared to the corresponding binary composites and the CNT/TiO2/ZnO-85 wt %, CNT/TiO2/ZnO-95 wt % materials. The improved photocatalytic activity was attributed to synergistic effect of CNT, TiO2and ZnO, in which ZnO can absorb photons to produce electrons and holes, whereas TiO2and CNT can reduce the electron-hole recombination.Keywords:carbon nanotubes;titanium dioxide;zinc oxide;photocatalyst
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Royal Society Open Science
·
2018
·Vol. 5
·期 4
·
IF 2.504
Zhigang Yi,Juan Wang,Tao Jiang,Qiong Tang,Ying Cheng
In this study, photocatalytic experiments of 20 mg l−1 sulfamethazine (SMN) in aqueous solution containing ZnO with different morphologies, tetra-needle-like ZnO (T-ZnO), flower-like ZnO (F-ZnO) and nanoparticles ZnO (P-ZnO), were performed. The results indicated that photocatalytic degradation of SMN was effective and followed the pseudo-first-order reaction, but the degree of SMN mineralization showed obvious differences using ZnO with different shapes. After 12 h irradiation, 86%, 71% and 50% of the initial total organic carbon was eliminated in SMN suspension containing T-ZnO, F-ZnO and P-ZnO, respectively. The release ratio of sulfur was close to 100% in the presence of T-ZnO, but reached to 86% and 67% in the presence of F-ZnO and P-ZnO, respectively. The release ratio of nitrogen was about 76%, 63% and 40% using T-ZnO, F-ZnO and P-ZnO as photocatalyst, respectively. The morphology of ZnO played an important role in determining its catalytic activity. Seven intermediates were observed and identified in the UV/T-ZnO reaction system by LC-MS/MS analysis, and a possible degradation pathway was proposed.
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高影响因子
MICROCHIMICA ACTA
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2018
·Vol. 185
·期 10
·1-8
·
IF 5.705
He Baoshan,Dong Xiaoze
The authors describe an aptamer based assay for the mycotoxin patulin (PAT). A gold electrode was modified with a composite made from ZnO nanorods (ZnO-NRs) and chitosan. The ZnO-NRs was prepared by reaction with ammonia and subsequent hydrothermal growth. Its properties were characterized by X-ray diffraction, Raman spectroscopy and scanning electron microscopy. Subsequently, thiol-modified aptamers were self-assembled on AuNPs that had been electrodeposited on the surface of the modified electrode. The presence of ZnO-NRs on the electrode increases the loading with AuNPs and aptamers. It also warrants a relatively stable microenvironment for the aptamers. In the presence of PAT, it will form a complex with the aptamer on the electrode surface. This hinders electron transfer from the electrode to the redox probe hexacyanoferrate and results in reduced current, which is typically measured at 0.176 V (vs. Ag/AgCl). The concentration of PAT can be calculated from the differences in the peak current before and after incubation with PAT. The assay has a linear response in the 50 ng·mL −1 to 0.5 pg·mL −1 PAT concentration range and a 0.27 pg·mL −1 lower detection limit. The sensor is specific, reproducible, repeatable, and long-term stable. It was successfully applied to the determination of PAT in spiked juice samples.
Schematic representation of aptamer based detection of patulin (PAT). It is based on the fact that ZnO nanorods on the surface of the electrode increase the loading of the gold nanoparticles and the aptamers, thereby improving the electrode performance.
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Environmental Science-Nano
·
2019
·Vol. 6
·期 4
·1180-1188
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IF 7.704
Jingjing Du,Yuyan Zhang,Mingxiang Qv,Ke Li,Xiaoyun Yin,Brian Keith Sorrell,Mingbao Wei,Chuang Ma
To comprehensively assess the effects of ZnO nanoparticles on freshwater decomposition processes under natural sunlight, we conducted an indoor microcosm experiment on Populus nigra L. leaf decomposition with ZnO nanoparticles (5, 10, and 20 mg L−1) under simulated sunlight. A significant and negative relationship between decomposition rate and ZnO nanoparticle concentrations was observed after 30 days of exposure. ZnO nanoparticles significantly inhibited extracellular enzyme activities, dehydrogenase activities and fungal biomass as well as impacting fungal community structures. Additionally, the exposure to ZnO nanoparticles increased microbial antioxidant activities and 5 mg L−1 of ZnO nanoparticles led to the greatest increase. Importantly, the activities of carbon-related enzymes were significantly inhibited by ZnO nanoparticles, but leaf carbon decomposition was stimulated in the microcosms containing 10 and 20 mg L−1 of ZnO nanoparticles, suggesting the possible contribution of ZnO nanoparticles' physicochemical properties under sunlight to leaf decomposition. The information provided here on the effects of different concentrations of ZnO nanoparticles under sunlight will help us to better evaluate the impacts of ZnO nanoparticles on stream functioning.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
·
IF 4.229
Zexiao Zheng,Xukai Li,Laisheng Li,Yiming Tang
Quaternary semiconductor film consists of ZnO, ZnSe, CdSe and MoS 2 was designed to establish a core-shell structure to achieve the photoelectrochemical oxidation of amoxicillin . The hybrid photoelectrode was fabricated on a FTO substrate from bath deposition methods . The hierarchical ZnSe/CdSe/MoS 2 shell was covered uniformly on ZnO nanorod core which provided a direct pathway for electron transfer , large surface area to enhance light absorption and increase active sites. The quaternary photoelectrode exhibited a photocurrent density of 26.86 mA/cm 2 at 0 V vs. Ag/AgCl under UV–visible light illumination, which was 31.9 times, 16.7 times and 1.6 times of that of the bare ZnO nanorods, binary ZnO/ZnSe and ternary ZnO/ZnSe/CdSe photoelectrodes, respectively. 10 ppm of amoxicillin was completely degraded in 30 min by the quaternary working electrode with an applied bias of 0.5 V vs. Ag/AgCl. The reusability and stability of quaternary electrode was demonstrated by 3-run recycling experiments. The enhanced photoelectrochemical performance of quaternary photoelectrode can be attributed to the enhancement of light absorption and increased active sites from the coverage of visible-active layers, the accelerated charge separation from the formation of p-n junction and reduced photocorrosion of CdSe from the protection of MoS 2 on the surface.
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ACS Omega
·
2018
·
IF 0
Pu Sun,Ruping Liu,Ruifang Ma,Zhengdao Xie,Fan Su,Yanfang Gong,Zeming Mu,Luhai Li,Yen Wei,Qiang Wan
Branched nanostructures of semiconductors based on one-dimensional heterostructures have many promising applications in optoelectronics, supercapacitors, photocatalysts, etc. Here, we report a novel branched core/shell CdO/ZnO hetero-nanostructure that resembles a Crimson bottlebrush (Callistemon Citrinus) but with intriguing hexagonal symmetry. The nanomaterials were fabricated via an improved one-step chemical vapor deposition method and consist of a CdO wire as the core and ZnO as the shell. With cadmium acting as a catalyst, ZnO nanowires grow as perpendicular branches from the CdO/ZnO one-dimensional core/shell structure. The nanostructures were characterized with X-ray diffraction scanning and transmission electron microscopy. A homogeneous epitaxial growth mechanism has been postulated for the formation of the nanostructure. The materials show a broad and strong absorption ranging from visible to ultraviolet and a better photoelectrocatalytic properties in comparison to pure ZnO or CdO. Our synthetic strategy may open up a new way for controlled preparation of one-dimensional nanomaterials with core/shell heterostructure, which could find potential applications in solar cells and opto-electrochemical water-splitting devices.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Wei Liu,Ding Gu,Xiaogan Li
Mesoporous ZnSe/ZnO heterojunctions were prepared by the in situ thermal oxidation of ZnSe at elevated temperatures in air. The partial replacement of selenium by oxygen in the ZnSe nanoflakes led to a highly porous microstructure with 8.2 nm mesopores distributed fairly uniformly within the formed heterojunction sample. The as-fabricated mesoporous ZnSe/ZnO heterojunction-based sensor exhibits an approximately 7.3-fold significantly higher response than those of both pristine ZnO- and ZnSe-based sensors when exposed to 8 ppm NO2 at 200 °C. This sensor also demonstrates excellent selectivity for methanol, ethanol, acetone, benzene, methylbenzene, ammonia, and formaldehyde. The significantly enhanced response of the ZnSe/ZnO-based sensor is due to the mesoporous microstructure during thermal oxidation of ZnSe to ZnO, yielding more active sites and the accumulation of electrons in the ZnO nanocrystals transferred between ZnSe/ZnO interfaces.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Meng Wu,Luting Yan,Mingyuan Xu,Yanyun Zhu,Yuting Li,Xiaotong Sun,Runxiang Xu,Jingfa Yang
Graphene-based hydrogels (GH) have exhibited prominent performances in wastewater treatment . Herein, Special-shaped ZnO tetrapods and TiO 2 nanosheets were introduced to the preparation of GH via a one-step hydrothermal reduction method. The ZnO-GH and TiO 2 -GH composite hydrogel with a uniform 3D network structure and good mechanical properties can be used as an adsorbent for printing and dyeing wastewater. The optimum doping amount of ZnO and TiO 2 in the composite hydrogel and the adsorption regularity to rhodamine B (RhB) with different concentrations were discussed. The cyclic adsorption performance and adsorption kinetics were briefly discussed. When the doping ratio of ZnO to graphene oxide (GO) is 5:8, ZnO-GH has the best adsorption rate, which is 71.7%. The best degradation rate appears at a ZnO doping ratio of 1:2, which also shows the best total removal rate of RhB of approximately 82.20%. When the doping ratio of TiO 2 to GO is 3:4, the photocatalytic degradation rate is 30.3%, and the total removal rate of RhB reaches 99.1%, which indicates that RhB can be almost completely removed by TiO 2 -GH through adsorption and degradation. After five cycles, the adsorption capacity of ZnO-GH and TiO 2 -GH for the low RhB concentration is still good. The addition of ZnO and TiO 2 improves not only the adsorption and degradation properties of the composite hydrogel but also its recycling performance as a result of the increase in mechanical stability.
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NanoImpact
·
2017
·
IF 0
Xiaolong Wang,Fengxia Yang,Jing Zhao,Yan Xu,Daqing Mao,Xiao Zhu,Yi Luo,P.J.J. Alvarez
Bacterial exposure to ZnO nanoparticles (nZnO) at sublethal concentrations (1 to 10 mg/l) for 24 h significantly increased the conjugative frequency of antibiotic resistance plasmid RP4. A 24.3-fold increase was observed in E . coli pure cultures, and an 8.3-fold increase occurred in a mixed culture of indigenous aquatic microbiota. In addition, nZnO increased by three fold the transformation efficiency of E . coli via the uptake of naked plasmid pGEX4T-1, which was confirmed by confocal fluorescence microscopy. Enhanced horizontal transfer of resistance plasmids was a nanoparticle-specific effect, since 5.3 mg/l Zn 2 + (representing the maximum release of Zn 2 + from 10 mg/l nZnO) did not enhance RP4 transfer or pGEX4T-1 uptake frequency. This phenomenon was attributed to increased bacterial cell permeability after exposure to nZnO (but not to Zn 2 + ), which was confirmed by flow cytometry with propidium iodide staining. Overall, this study forewarns that accidental or incidental release of nZnO may facilitate environmental dissemination and propagation of antibiotic resistance genes through horizontal gene transfer.
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