RSC Advances
·
2015
·Vol. 5
·期 74
·59887-59894
·
IF 3.84
Yimai Liang,Na Guo,Linlin Li,Ruiqing Li,Guijuan Ji,Shucai Gan
Porous 3D Ce-doped ZnO microflowers were prepared by a hydrothermal method followed by a low temperature annealing process. The effects of Ce doping on the structural and photocatalytic properties of porous ZnO microflowers were investigated in detail. The samples were characterized using XRD, SEM, EDS, XPS, DRS, PL spectra and BET surface area measurements. According to the XRD analysis, both of the crystalline structures of the synthesized pure ZnO and Ce-doped ZnO samples are hexagonal wurtzite. The XPS results demonstrated the successful synthesis of Ce4+ doped ZnO. In addition, the SEM morphologies showed the unique porous 3D flower-like structure of the Ce-doped ZnO. Compared with the porous ZnO microflowers, the Ce-doped ZnO samples exhibit improved photocatalytic performance in the decomposition of Rhodamine B (RhB). It is proposed that the special structural feature with a porous 3D structured and Ce modification lead to the rapid photocatalytic activity of the Ce-doped ZnO microflowers.
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RSC Advances
·
2015
·Vol. 5
·期 32
·25215-25221
·
IF 3.84
Liping Lin,Xiao Peng,Si Chen,Bao Zhang,Yaqing Feng
Three-dimensional (3D) ZnO nanoaggregates with different morphologies and sizes were fabricated by the hydrothermal method, including cauliflower-like microspheres with an average diameter of 1–2 μm, nano-sheet aggregated safflower-like microspheres with 3–4 μm and ixora-like nano-structures with 500–600 nm. We found that their morphology formation was dependent on the concentration of OH− and construction agent (glutamic acid) during the synthesis process, based on which we proposed the mechanism for the formation of ZnO nanoaggregates. The studies showed that, the photo to current conversion efficiencies (PCEs) of the dye-sensitized solar cells (DSSCs) in which the photoanodes were fabricated using the prepared 3D ZnO nanoaggregates were all higher than those obtained employing the ZnO nanoparticles (NPs). In particular, the PCE of the DSSC based on the cauliflower-like ZnO photoanode (4.52%) was about 21% higher than that fabricated with the ZnO NP-based photoanode. This can be attributed to the higher specific surface area of the cauliflower-like ZnO photoanode leading to a greater amount of dye adsorption, more suitable size for light scattering and better inner connection for the transportation of electrons. Moreover, when these 3D ZnO nanoaggregates were used as the scattering layers in the P25-based photoanode in DSSCs, higher PCE of up to 6.74% was achieved, compared to 5.37% obtained for the DSSC without a scattering layer.
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MATERIALS LETTERS
·
2015
·
IF 2.489
Guangxia Cao,Hanjia Yang,Kunquan Hong,Wenjia Hu,Mingxiang Xu
Aligned zinc oxide/zinc sulfide core–shell nanowire arrays are synthesized on transparent conductive oxide (TCO) glass substrate by sulfurizing ZnO nanowires using a vapor phase method. The length of these nanowires is about 7.3 μm with diameter of ~100 nm. The thickness of the ZnS shell can be controlled by adjusting the reaction time. It is found that the shell layer is well crystallized with preferring growth direction of ZnS [002]. The result indicates that when used to decompose methyl orange (MO), the core–shell nanowire arrays have superior photocatalytic performance under UV-light irradiation, which shows considerable potential applications of this nanocomposite in water purification.
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ADVANCED MATERIALS
·
2013
·Vol. 25
·期 40
·5750-5755
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IF 14.829
Jizhong Song,Sergei A. Kulinich,Jian Yan,Zhigang Li,Jianping He,Caixia Kan,Haibo Zeng
Graphical Highly epitaxial ZnO nanowire-on-nanoplate structures as efficient and transferable electron field emitters are reported here. Well-faceted ZnO nanoplates can be used as efficient substrates for the epitaxial growth of nanowires with a sharp and high-quality interface, which significantly improves its field emitter performance. Because of its scalable preparation, high performance and facile transfer, the novel material is of high potential for applications in various optoelectronic devices.
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DALTON TRANSACTIONS
·
2014
·Vol. 44
·期 7
·3034-3042
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IF 4.097
Xiang Chen,Feng Zhang,Qian Wang,Xiao Han,Xin Li,Jiuyu Liu,Huiming Lin,Fengyu Qu
ZnO/SnO2 hetero-nanofibers about 250 nm in diameter and several micrometers in length are synthesized via an electrospun method using zinc chloride and stannous chloride as inorganic sources. All fibers are composed of many nanoparticles (5–10 nm) that induce a highly porous structure as well as high surface area. By adjusting the ratio of zinc/stannous source, the synthesized porous ZnO/SnO2 materials show various structures (corrugated fiber and tube), that are a result of the different oxidation/decomposition temperatures of the two components. Their photodegradation abilities toward various dye wastewaters (methylene blue, congo red, eosin red, and methyl orange) are demonstrated, showing fast photodegradation and good recycling ability. It is noteworthy that ZnO/SnO2 exhibits an enhanced photodegradation ability to congo red, ascribed to the high adsorption capacity derived from the strong electrostatic interaction between ZnO/SnO2 and congo red. Based on the investigation, these porous ZnO/SnO2 hetero-nanofibers possess versatile potential applications for wastewater purification.
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Materials
·
2016
·Vol. 9
·期 4
·282
·
IF 2.728
Dawei Li,Jun Zang,Jin Zhang,Kelong Ao,Qingqing Wang,Quanfeng Dong,Qufu Wei
Carbon xerogel-zinc oxide (CXZnO) composites were synthesized by a simple method of sol-gel condensation polymerization of formaldehyde and resorcinol solution containing zinc salt followed by drying and thermal treatment. ZnO nanoparticles were observed to be evenly dispersed on the surfaces of the carbon xerogel microspheres. The as-prepared CXZnO composites were mixed with laccase (Lac) and Nafion to obtain a mixture solution, which was further modified on an electrode surface to construct a novel biosensing platform. Finally, the prepared electrochemical biosensor was employed to detect the environmental pollutant, catechol. The analysis result was satisfactory, the sensor showed excellent electrocatalysis towards catechol with high sensitivity (31.2 µA·mM−1), a low detection limit (2.17 µM), and a wide linear range (6.91–453 µM). Moreover, the biosensor also displayed favorable repeatability, reproducibility, selectivity, and stability besides being successfully used in the trace detection of catechol existing in lake water environments.Keywords:carbon xerogel;ZnO;laccase;phenolic biosensor
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CHEMICAL PHYSICS LETTERS
·
2017
·
IF 1.815
Yan Xu,Shumin Wu,Xianliang Li,Hao Meng,Xia Zhang,Zhuopeng Wang,Yide Han
We demonstrate a general strategy to design step by step the Ag nanoparticle-functionalized ZnO micro-flowers (Ag/ZnO composites). XRD patterns confirmed the presence of Ag nanoparticles in ZnO/Ag composites, and the SEM and TEM results further demonstrated that Ag nanoparticles were highly dispersed and anchored onto the surface of each ZnO nanosheets. By using the ZnO/Ag composites, the photodegradation of two herbicide derivatives, metamitron and metribuzin, were studied. The enhanced photocatalytic performance was ascribed to the fact that the Ag deposition could reduce the recombination probability of electron-hole pairs, and the photocatalytic mechanism were also investigated in this paper.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2016
·
IF 3.014
Yiming Li,Xiaojun Liu,Xiao Chen,Dian Wang,Yunqiu He
In the present work, the graphene oxide (GO) and vertically oriented ZnO nanosheets composite structures on substrate supported by the ZnO nanorods were realized. The elaborate microstructures, chemistries and relevant energy level structures of different composites were carefully characterized. By exploiting the intrinsic excitation of the semiconducting GO for photoelectric conversion, the open circuit photovoltage and the short circuit photocurrent responses of the heterojunction films under visible irradiation were investigated through photoelectrochemical measurements, with maximum of −77.0 mV and −3.8 μA/cm 2 , respectively. Comparisons of the conversion properties of the samples suggested two conclusions. Firstly, the substantial C–O–Zn bonds at the GO-ZnO interfaces should be key to improved photovoltaic performance , by facilitating the separation of photo-generated charge carriers. Secondly, the perpendicular ZnO nanosheets with less defects and shortened paths, and the coated GO flakes on ZnO with more ordered lattice and extensive exposure to electrolytes together have resulted in enhanced conversion performance, since they are beneficial for more fluent collection of electrons and holes, respectively. In virtue of the specific heterogeneous configuration of the composites as prepared, this work has pushed a step for the practical photovoltaic application of GO as absorbers and hole transporters.
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Scientific Reports
·
2016
·Vol. 6
·期 1
·1-8
·
IF 5.228
Li Jingshuai,Wang Qi,Guo Zhankui,Ma Hongmin,Zhang Yong,Wang Bing,Bin Du,Wei Qin
The combination of fluorescent nanoparticles and specific molecular probes appears to be a promising strategy for developing fluorescent nanoprobes. In this work, L-cysteine (L-Cys) capped Fe 3 O 4 @ZnO core-shell nanoparticles were synthesized for the highly selective detection of Fe 3+ . The proposed nanoprobe shows excellent fluorescent property and high selectivity for Fe 3+ due to the binding affinity of L-Cys with Fe 3+ . The binding of Fe 3+ to the nanoprobe induces an apparent decrease of the fluorescence. Thus a highly selective fluorescent chemosensor for Fe 3+ was proposed based on Fe 3 O 4 @ZnO nanoprobe. The magnetism of the nanoprobe enables the facile separation of bound Fe 3+ from the sample solution with an external magnetic field, which effectively reduces the interference of matrix. The detection limit was 3 nmol L −1 with a rapid response time of less than 1 min. The proposed method was applied to detect Fe 3+ in both serum and wastewater samples with acceptable performance. All above features indicated that the proposed fluorescent probe as sensing platform held great potential in applications of biological and analytical field.
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International Journal of Applied Ceramic Technology
·
2016
·Vol. 14
·期 2
·128-134
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IF 1.534
Junli Liu,Aiping Hui,Jianzhong Ma,Zhuping Chen,Yi Peng
ZnO hollow nanospheres with porous shells were prepared successfully via a simple hard-template method and a calcination process. Then the obtained ZnO hollow nanospheres were encapsulated with mildew-proof agent and modified by polydopamine. At last,antimicrobial casein-based coatings were obtained by mixing the drug-loaded ZnO and casein latex. Antimicrobial testing results revealed casein-based hollow ZnO/mildew-proof agent nanocomposite films displayed the better antimicrobial activities, and it still has antimicrobial properties after 1 year.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Dong Huang,Zhifu Liu,Yongxiang Li,Yun Liu
In this study, a colossal permittivity up to 3800 and a low dielectric loss of 0.11 at 1 kHz have been obtained from the (Li, In) co-doped ZnO ceramic [Zn (1−2x) (Li, In) x O] when x was 0.5%. Electric modulus spectroscopy and impedance analysis were used to investigate the origin of its high permittivity. Two relaxation peaks and a dielectric anomaly were observed in the temperature range of 293–363 K. According to the Debye relaxation theory, the low- and high-temperature relaxation peaks with activation energies of 0.09 eV and 0.29 eV, have been attributed to the hopping of singly and doubly charged oxygen vacancies , which are created by lithium and indium ions doping and oxygen deficiency during sintering process. After thermal treatment in an oxidizing atmosphere, the peaks related to the singly and doubly charged oxygen vacancies disappear and the permittivity reduces to ∼460 at room-temperature. From the X-ray photoelectron spectra (XPS), the concentrations of oxygen vacancies decrease after the O 2 -annealing process. The results reveal that the oxygen defects would be the main origin of the colossal permittivity of co-doped ZnO at room-temperature range.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 135
·期 6
·45831
·
IF 1.86
Jing Zhang,Liqun Chen,Jiada Chen,Dan Wu,Jie Feng
We demonstrated an extremely facile way to fabricate inorganic–organic microgels with pH sensitivity and fluorescence. Aqueous dextran microgels are crosslinked by ZnO quantum dots (QDs). The ZnO@Dextran microgels were synthesized by simply mixing amino-modified ZnO (ZnO QDs) with carboxymethyl dextran (CMD) while stirring. The hybrid microgels showed an average diameter of ∼5 μm and strong fluorescence under ultraviolet (365 nm) irradiation. Up to 79.3 wt % of ZnO QDs were loaded into microgels. The ZnO QDs crosslinkage in the hybrid microgels structure enabled the microgels to degrade under mild acidic environment due to pH sensitivity of ZnO QDs. After loading of doxorubicin (Dox), the microgels were used as drug carriers for pH-controlled release of Dox. The degradation of the microgels and the release of loaded cargos could be monitored by detecting fluorescence intensity of the microgels. Moreover, owing to the cytotoxicity of ZnO QDs at their destination, drug-loaded ZnO@Dextran microgels can be used for synergistic therapy. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45831.
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