FIBERS AND POLYMERS
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2014
·Vol. 15
·期 2
·281-285
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IF 1.113
Li Chaorong,Xie Yong,Liu Qiuyan,Zheng Yingying,Zhang Xiaobo,Dong Wenjun
We report a simple and effective route to fabricate branched hierarchical flower-like nanostructures of ZnO on natural cotton cellulose fiber by combining electrospinning and the low-temperature hydrothermal growth technique. First, natural cotton cellulose nanofibers were prepared by electrospinning cotton cellulose /LiCl/DMAc solution. The electrospun cotton cellulose nanofibers served as flexible substrate, on which the branched, highly uniform, and dense flower-like ZnO were hydrothermally grown. The as-prepared cotton cellulose/ZnO nanocomposite fibers were characterized by SEM, HRTEM, EDS, TG, and UV-vis spectrophotometry. The modified cotton cellulose nanocomposite fibers were not only exhibiting dispersed uniformly, but also rendered excellent protection against UV radiation because of the incorporation of flower-like ZnO nanostructures. Therefore, the as-prepared nanocomposite fibers demonstrate a significant performance in ultraviolet protection and provide a potential application for ultraviolet detection.
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Nanoscale Research Letters
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2014
·Vol. 9
·期 1
·1-8
·
IF 2.481
Abdiryim Tursun,Ali Ahmat,Jamal Ruxangul,Osman Yakupjan,Zhang Yu
Poly(3,4-ethylenedioxythiophene)/zinc oxide (PEDOT/ZnO) nanocomposites were prepared by a simple solid-state heating method, in which the content of ZnO was varied from 10 to 20 wt%. The structure and morphology of the composites were characterized by Fourier transform infrared (FTIR) spectroscopy, ultraviolet-visible (UV-vis) absorption spectroscopy, X-ray diffraction (XRD), and transmission electron microscopy (TEM). The photocatalytic activities of the composites were investigated by the degradation of methylene blue (MB) dye in aqueous medium under UV light and natural sunlight irradiation. The FTIR, UV-vis, and XRD results showed that the composites were successfully synthesized, and there was a strong interaction between PEDOT and nano-ZnO. The TEM results suggested that the composites were a mixture of shale-like PEDOT and less aggregated nano-ZnO. The photocatalytic activity results indicated that the incorporation of ZnO nanoparticles in composites can enhance the photocatalytic efficiency of the composites under both UV light and natural sunlight irradiation, and the highest photocatalytic efficiency under UV light (98.7%) and natural sunlight (96.6%) after 5 h occurred in the PEDOT/15wt%ZnO nanocomposite.
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BIOSENSORS & BIOELECTRONICS
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2015
·
IF 6.409
Xuehui Pang,Yong Zhang,Jihong Pan,Yanxia Zhao,Yao Chen,Xiang Ren,Hongmin Ma,Qin Wei,Bin Du
Based on ZnO nanorods (NRs)/CH 3 NH 3 PbI 3 /nitrogen-doped carbon quantum dots (NCQDs) nanocomposites , the highly sensitive detection of fibroblast-like synoviocyte (FLS) cell was realized by a photoelectrochemical (PEC) biosensor. ZnO/CH 3 NH 3 PbI 3 /NCQDs nanocomposites were exploited as the photo-to-electron generator to produce the signal. CH 3 NH 3 PbI 3 was spin-coated on ZnO surface after ZnO NRs grew on ITO electrode then by dropping on the modified electrode , NCQDs were diffused and adhered to the surface of ZnO and CH 3 NH 3 PbI 3 . In the presence of EDC/NHS, the combination of CH 3 NH 3 PbI 3 and NCQDs was achieved by the carboxyl groups (–COOH) and amino groups (–NH 2 ) in the preparation process. Furthermore, the capture probe of FLS cell, CD95 antibody, can be anchored by –COOH and –NH 2 groups through EDC/NHS. The specific recognition between the antibody capture probes and cell targets gained high-sensitive detection for FLS cell for the first time. The developed biosensor showed a wide linear range from 1.0×10 4 cell/mL to 10 cell/mL and a low detection limit of 2 cell/mL. This kind of biosensor would provide a novel detection strategy for FLS cell.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2014
·
IF 2.291
Xingyuan Guo,Changfeng Chen,Shengyan Yin,Weiye Song,Feng Shi,Weiping Qin.
In this work, the effects of NaYF 4 :Yb 3+ , Tm 3+ (NYT) structure on the near-infrared light (NIR) photocatalysis performance of ZnO were investigated. α-NYT/ZnO nanocomposites (NCs) and β-NYT/ZnO NCs were fabricated by a high temperature decomposition reaction method. The prepared NCs were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV–vis spectroscopy, Raman spectroscopy, and photoluminescence spectra (PL). The NIR photocatalytic activities of the synthesized α- and β-NYT/ZnO NCs were studied by the degradation of Rhodamine B. The differential photocatalytic activities between of α- and β-NYT/ZnO NCs are believed to be correlated to the effects of α- and β-NYT on the oxygen vacancies and exposed crystal face of ZnO.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2015
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IF 2.752
Peifang Wang,Di Wu,Yanhui Ao,Chao Wang,Jun Hou
ZnO nanorod arrays (NRAs) co-loaded with Au nanoparticles (NPs) and reduced graphene oxide (RGO) are fabricated using a simple one-step electrochemical deposition method. The obtained photocatalysts were characterized by field emission scanning electron microscopy, X-ray diffractometer, photoluminescence and UV–vis absorption spectra. The photocatalytic activity of the as-prepared samples was investigated by degradation of methylene blue under visible light irradiation. The results showed that Au/RGO–ZnO NRAs exhibited much higher photocatalytic activity than RGO–ZnO NRAs, Au–ZnO NRAs and pure ZnO NRAs. The synergistic effect of Au NPs and RGO enhances visible light absorption range and transmits the hot electrons more efficiently. This research will encourage more rational design of efficient visible light responsive photocatalysts.
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MATERIALS RESEARCH BULLETIN
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2015
·
IF 2.288
Chuan-Yang Shang,Wei-Xun Li,Rui-Feng Zhang
ZnO nanowires were successfully introduced into a macroporous SiO 2 by in-situ hydrothermal growth in 3D pores. The obtained composites were characterized by SEM and XRD, and used as supports to immobilize Candida rugosa lipase (CRL) through adsorption. The high specific surface area (233 m 2 /g) and strong electrostatic interaction resulted that the average loading amount of the composite supports reached 287.2 mg/g. Both adsorption capacity and the activity of the CRL immobilized on the composite supports almost kept unchanged as the samples were soaked in buffer solution for 48 h. The immobilized CRL exhibited better thermal stability, reusability and pH adaptability in comparison to free CRL. The immobilized CRL was used as biocatalyst for the preparation of phytosterol esters by the esterification of phytosterol and oleic acid. A maximum molar conversion of 96.5% was achieved under the optimal condition. After twelve recycles the immobilized lipase could retain 89.9% of its initial activity.
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Journal of Materials Chemistry B
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2014
·Vol. 3
·期 7
·1426-1432
·
IF 0
Shanshan Wu,Xuan Huang,Xuezhong Du
Hollow mesoporous silica spheres (HMSS) have a hierarchical mesoporous structure composed of a hollow cavity and mesoporous shell available for high capacity drug storage. The covalent attachment of ZnO quantum dots (QDs) to the HMSS outer surface as gatekeepers via disulfide-conjugated two amide linkages encapsulated the anticancer drugs doxorubicin (DOX) within the HMSS cavities and pores, and minimized premature release of the drug. The controlled release of the drug from the ZnO-gated HMSS delivery system was realized by the dissolution of ZnO QDs upon a decrease in pH and cleavage of the disulfide bonds, which indicates that the pH- and redox-responsive controlled release of the drugs could be synergically stimulated by tumor cells with weakly acidic environments and high-expressed glutathione. The constructed ZnO-gated HMSS delivery system has promising applications in site-specific drug release for tumor chemotherapy.
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RSC Advances
·
2017
·Vol. 7
·期 61
·38444-38451
·
IF 3.108
Jia Xia,Kaidi Diao,Zhou Zheng,Xudong Cui
The design of porous metal oxides with noble metal doping has attracted tremendous attention due to their vital importance for gas sensing applications. Herein, we report the synthesis of porous Au/ZnO nanoparticles (NPs) through a facile metal organic framework (MOF) route. The structures, sensing properties, as well as sensing mechanisms of products are carefully investigated. The porous Au/ZnO NPs show a high gas-sensing response (17.1 ppm−1) and selectivity towards low concentration acetone at an optimum temperature of 275 °C. The enhanced sensing performances are ascribed to the chemical and electronic sensitization of Au NPs, the porous structure and the high specific surface area of Au/ZnO NPs. Our studies might provide a simple MOF-derived method to synthesize porous structures with noble metal doping and would be beneficial to the development of high performance gas sensing materials.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Shao-jia Liu,Fa-tang Li,Yi-lei Li,Ying-juan Hao,Xiao-jing Wang,Bo Li,Rui-hong Liu
The mismatches of lattices and energy bands in heterojunction are the dominant factors restricting the generation efficiency of reactive oxygen species (ROS) that are powerful tools for water purification and anti-bacteria. In this paper, the mediated lattice matching role of amorphous Al 2 O 3 is presented for constructing the ternary g-C 3 N 4 /Al 2 O 3 /ZnO heterojunctions, which exhibit higher molecular oxygen activation performance than binary g-C 3 N 4 /ZnO and g-C 3 N 4 /Al 2 O 3 heterojunctions. The oxygen activation ability and the ROS generation were testified by the electron paramagnetic resonance (EPR) measurement, transformation of nitroblue tetrazolium (NBT) and degradation of methylene blue (MB). The ROS include superoxide anion radical ( O 2 − ) and consequent product of hydroxyl radical ( OH). The superior oxygen activation performance of the ternary heterojunctions can be attributed to the lattices matching of the mediated amorphous Al 2 O 3 and the resultant efficient cascade electron transfer.
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APPLIED SURFACE SCIENCE
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2016
·
IF 3.15
Zengming Zhang,Yong Hu,Fuyu Qin,Yutian Ding
TiO 2 /ZnO core–shell photo-anodes with a large surface area were synthesised by a combination of chemical growth and direct current (DC) magnetron sputtering (MS). The use of these combined methods for the advancement of dye-sensitized solar cells (DSSCs) was discussed. An understanding of the morphology and structure of this core–shell material was obtained from the use of scanning electron microscopy (SEM) and transmission electron microscopy (TEM). It was found that the thickness of the ZnO nanoshells (as assessed by using TEM), prepared by MS, has a significant effect on improvements in the conversion efficiency. The conversion efficiency can be greatly improved from 0.06% to 0.72% by optimising different experimental conditions, such as ZnO nanoshell MS time and chemical bath deposition time. The enhanced efficiency may be attributed to the emergence of a ZnO energy barrier and the improvement of the photo-anode surface area.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2016
·
IF 2.76
Aiping Hui,Junli Liu,Jianzhong Ma
Cerium doped flower-shaped ZnO crystallites were prepared via a facile microwave-assisted hydrothermal method with zinc nitrate hexahydrate as zinc sources, cerium (III) nitrate nonahydrate as dopant. The obtained samples were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscope (TEM), Brunauer-Emmett-Teller surface area measurement (BET), energy dispersive spectroscopy (EDS) and UV⿿vis diffuse reflectance spectroscopy. Antimicrobial activity of the samples against Candida albicans ( C. albicans ) and Aspergillus flavus ( A. flavus ) was compared with pure ZnO under visible light sources. The results indicated that cerium doped flower-shaped ZnO crystallites had different crystal structure with the increased levels of cerium content. Besides, the band gap of ZnO crystallites decreased and its crystallinity increased with the adding of cerium ion. In particular, increasing levels of the cerium dopant more than 0.8% results in decreased optical band gap (3.06 eV) and enhanced antimicrobial activity against C. albicans (75%) and A. flavus (80%) under visibler light sources.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Yawei Yang,Wenxiu Que,Xinyu Zhang,Xingtian Yin,Yonglei Xing,Meidan Que,Hongyang Zhao,Yaping Du
A chloroform-assistant Se dissolution in oleylamine without trioctylphosphine and alkylthiol as the green precursor was used for facile and robust synthesis of quaternary selenide nanocrystals. The S 2− modified hydrophilic Cu 2 ZnSnS 4 and Cu 2 ZnSnSe 4 nanocrystals were first prepared by a one-pot thermal decomposition route, followed by a bi-phase hydrophilic treatment process. As a proof of concept, the as-obtained hydrophilic nanocrystals were hybridized with ZnO microspheres as photosensitizers to achieve visible light-driven photocatalytic application; on the other hand, hybridized with NaYF 4 : Yb, Tm microplates to achieve near-infrared light-driven photocatalytic application. These photosensitized hybrids as photocatalysts expanded the light absorption from ultraviolet to visible even near-infrared region, which showed excellent photocatalytic Rhodamine B degradation under visible and near-infrared irradiation compared to pure ZnO and NaYF 4 : Yb, Tm, respectively. Therefore, these hydrophilic Cu 2 ZnSnS 4 and Cu 2 ZnSnSe 4 nanocrystals are proved as efficient photocatalytic sensitizers due to the efficient utilization of the visible light and emissions upconverted from near-infrared light.
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