APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Qiang Guo,Liming Fu,Tao Yan,Wen Tian,Danfeng Ma,Jiaming Li,Yanan Jiang,Xitao Wang
Porous ZnO nanosheets (PNS-ZnO) were prepared by calcining ZnS(en) 0.5 (en = ethylenediamine) nanosheets in air, and g-C 3 N 4 (g-CN) nanofilms were coated on the surface of PNS-ZnO by thermal deposition using bulk g-C 3 N 4 as precursor. Experimental results showed that the graphene-like g-C 3 N 4 could be deposited on the surface of ZnO to form nanocomposites with core/shell structure. After the loading of g-CN, the light absorption and chemical adsorption of CO 2 over PNS-ZnO were improved obviously and the recombination of photogenerated electron and hole was greatly depressed due to the formation of heterojunction between PNS-ZnO and g-CN. All PNS-ZnO@g-CN nanocomposites exhibited much higher photocatalytic activity for CO 2 reduction with H 2 O vapor when compared to pure PNS-ZnO and bulk g-CN. The loading amount of g-CN had significant influence on the light absorption and photocatalytic activity, and PNS-ZnO@g-CN-0.4 exhibited the best photocatalytic performance, for which H 2 , CH 4 and CO production rates of 22.7, 30.5 and 16.8 μmol/g cat /h can be obtained, respectively.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Xian Li,Chengcheng Xu,Jie Sun,Yin Long,Yang Wang,Zhemin Li,Chunjiang Bai,Xiaosong Du
Ethylene is one of the important indicators to reflect the ripeness and senescence of the fruit. Ethylene sensor can be applied for fast ethylene detection nondestructively, yet high temperature condition of the common metal oxide semiconductors restrains its agricultural applications. Herein, porous-ZnO/carbon nanofibers (CNFs) three-dimensional structure, derived from Zeolite imidazole framework-8 (ZIF-8) /polyacrylonitrile (PAN) electrospun nanofibers, was proposed and further optimized. The results showed that porous-ZnO/CNFs exhibited increasing resistance to reducing ethylene at room temperature , well explained by the Fermi levels’ relative position of the sensing system. Repeatability, selectivity and stability were demonstrated. The addition of porous-ZnO (10 % composting mass ratio) resulted in a 428 % increase in the ethylene-sensing response compared with CNFs, and a 64.2 % improvement compared with ZnO/CNFs. The outstanding sensing performance can be attributed to the synergistic effect of porous and interconnected morphology, the formed p-n heterojunction , as well as oxygen-vacancy effect. This strategy is beneficial for designing efficient gas sensors at room temperature, and exploring the application of the advanced gas sensors in intelligent agriculture field.
研究领域:
农业科学
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材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 53
·28011-28019
·
IF 3.708
Junchao Wei,Jun Hu,Ming Li,Yong Chen,Yiwang Chen
Multiple drugs-loaded electrospun composite nanofibrous scaffolds have attracted much interest as drug delivery vehicles for the treatment of tissue defect after tumor resection. In this study, a novel mesoporous ZnO/poly(lactic-co-glycolic acid)/gelatin (mZnO/PLGA/GE) electrospun composite fiber encapsulated with both hydrophilic drug (doxorubicin hydrochloride, DOX) and hydrophobic drug (camptothecin, CPT) is fabricated. mZnO is firstly used to encapsulate DOX. Then, the DOX-loaded mZnO (DOX@mZnO) and CPT were mixed with PLGA/GE solution to fabricate electrospun hybrid nanofibers. The in vitro release results demonstrated that the CPT in the composite fibers presented a fast release, while DOX showed a sustained release behavior. The cell cytotoxicity test indicated that the composite nanofiber with two drugs showed strong antitumor efficacy against HepG-2 cells. Moreover, the addition of GE increased the hydrophilicity of the composite fibers. More importantly, the incorporated of mZnO within the PLGA/GE nanofibers cannot only significantly reduce the burst release of DOX, but also improve the mechanical durability of the composite nanofibers. Thus, the composite nanofibers could be a versatile drug delivery system encapsulated with both hydrophilic and hydrophobic anticancer drugs as implantable scaffolds for potential postsurgical cancer treatment.
研究领域:
生物材料学
·
肿瘤治疗
·
药剂学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2016
·Vol. 12
·期 29
·4007-4017
·
IF 8.315
Xiaolong Ren,Huilin Hou,Zhixiong Liu,Fengmei Gao,Jinju Zheng,Lin Wang,Wenge Li,Pengzhan Ying,Weiyou Yang,Tom Wu
1D mesoporous materials have attracted extensive interest recently, owning to their fascinating properties and versatile applications. However, it remains as a grand challenge to develop a simple and efficient technique to produce oxide nanofibers with mesoporous architectures, controlled morphologies, large surface areas, and optimal performances. In this work, a facile foaming-assisted electrospinning strategy with foaming agent of tea saponin is used to produce thoroughly mesoporous ZnO nanofibers with high purity and controlled morphology. Interestingly, mesoporous fibers with elliptical cross-section exhibit the significantly enhanced photocatalytic activity for hydrogen production, as compared to the counterparts with circular and rectangular cross-sections, and they also perform better than the commercial ZnO nanopowders. The unexpected shape dependence of photocatalytic activities is attributed to the different stacking modes of the mesoporous fibers, and a geometrical model is developed to account for the shape dependence. This work represents an important step toward producing thoroughly mesoporous ZnO nanofibers with tailored morphologies, and the discovery that fibers with elliptical cross-section render the best performance provides a valuable guideline for improving the photocatalytic performance of such mesoporous nanomaterials.
研究领域:
材料科学
·
纳米技术
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POROUS MATERIALS
·
2016
·Vol. 24
·期 3
·613-620
·
IF 1.385
Fu Yuanyuan,Zhong Baoying,Chen Yaqin,Song Yonggui,Zhou Rihui,Song Yonghai,Chen Shouhui
A novel porous spherical ZnO@carbon (C) nanocomposite based on zeolitic imidazolate frameworks (ZIFs-8)-directed method was prepared for lithium-ion batteries (LIBs). In this strategy, spherical ZnO nanoparticles were firstly prepared, then 2-methylimidazolate and Zn 2+ were added alternately under ultrasound to fabricate ZnO@ZIF-8. Finally, the novel porous spherical ZnO@C nanocomposites were obtained via pyrolyzing the corresponding ZnO@ZIF-8. The novel porous spherical ZnO@C nanocomposites were characterized with different analysis techniques such as scanning electron microscopy, transmission electron microscopy and X-ray powder diffraction. The resulted spherical ZnO@C nanocomposites exhibited a high reversible capacity of 932 mA h g −1 at 0.1 A g −1 after 100 cycles, which is much higher than that of the pure ZnO nanoparticles. The porous structure, high specific surface area and good electrical conductivity eventually contribute to the good performance of the resulted ZnO@C nanocomposites for LIBs should be ascribed to the proous structure and high BET surface area derived from ZIFs, as well as the good electrical conductivity of the amourphous carbon derived from ZIFs.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
PHYSICA B-CONDENSED MATTER
·
2024
·
IF 2.8
MeiGe Ding,XiHao Gao,Yongchen Sui,Zhenyu Yuan
This study designs to investigate a high-performance n-butanol gas sensor with a porous morphology. Porous ZnO flakes modified with Ag particles are prepared in two steps using hydrothermal and precipitation methods. Morphological analysis of the samples shows that the ZnO flakes were covered with mesopores with high porosity, and their edge lengths ranged from 3 μm to 6 μm, with a minimum thickness of 11.3 nm. Through rigorous gas sensing testing, we find that the optimal mass percentage Ag-ZnO sensor provided significantly better sensing behavior, with a 100.8 response for 100 ppm n-butanol, compared to 14.5 for the pure ZnO sensor, a 5.95-fold improvement. In addition, the sensor's optimal operating temperature is reduced from 290 °C to 190 °C, increasing its adaptability and versatility in practical applications. In subsequent tests, it is found that this Ag-ZnO sensor not only shows excellent selectivity to n-butanol but also favorable stability, with no significant degradation during 30 days of continuous testing. The experimental analysis shows that the formation of porous flake structure and the modification of Ag particles are effective approaches to improve the ZnO gas sensor.
研究领域:
材料科学
·
传感器技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Science of Advanced Materials
·
2015
·Vol. 7
·期 3
·526-531
·
IF 2.598
Chen Xiang,Gao Qian,Xiang Di,Lin Huiming,Han Xiao,Li Xin,Du Shantao,Qu Fengyu
Porous ZnO nanofibers were prepared through the electrospun method using zinc acetate as zinc source and polyvinylpyrrolidone as thickener agent. Under adjusting the amount of zinc acetate, the synthesized porous ZnO nanofibers show various structures (fiber, tube, and fiber-in-tube).
And the formation mechanism was discussed in detail. These porous ZnO samples show the uniform structure about 200 to 300 nm in diameter and several microns in length. All the fibers are composed of many ZnO nanoparticles (20–30 nm) that assemble to form the porous structure and induce
the large surface area and high pore volume of the sample. These porous ZnO nanofibers were configured as high performance sensors for acetone sensing, showing high sensitivity (S = 243.3 at 500 ppm), low detection limit (10 ppm), fast response/ recovery (7/17 s), and very good selectivity.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2019
·
IF 7.467
Xiao Zeng,Zhanhong Yang,Jinlei Meng,Linlin Chen,Hongzhe Chen,Haigang Qin
The porous ZnO/C composites derived from metal organic framework-5 (MOF-5) is obtained via a calcination method subsequent to hydrothermal process. The results of materials characterization analysis show that the porous ZnO/C composites is well-crystallized with cube morphology and possesses a large specific surface area. According to the electrochemical measurements, the porous ZnO/C composites as anodic materials for Nickel–Zinc rechargeable battery exhibits excellent electrochemical performance compared with that of the commercial ZnO, keeping the discharge specific capacity at 587 mAh g −1 with the capacity retention ratio of about 89.1% after 800 cycles. The outstanding electrochemical property of porous ZnO/C composites can be ascribed to the interconnected conductive network generated by the carbon layer and stable cube architectures derived from metal organic framework-5 precursor, which can facilitate the transportation of electrons and restrain the formation of zinc dendrites during repeated charge-discharge cycling. Furthermore, a novel sphere structure consisting of numerous intersecting disk-like sheets is transformed from the cubic porous ZnO/C composites after 600 cycles, which can contribute to the uniform current distribution and improve the performance of energy storage, revealing the truth for the long cycle life of porous ZnO/C composites.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Cheng Cai,Yang-Fan Xu,Hong-Yan Chen,Xu-Dong Wang,Dai-Bin Kuang
Photoelectrochemical (PEC) cell is a meaningful way to fulfil carbon dioxide (CO 2 ) conversion to value-added chemicals, but the exploration of ideal photocathode materials with high photo-conversion efficiency remains a challenge. Herein, porous ZnO@ZnSe core/shell nanosheet array on fluorine doped-tin oxide (FTO) glass is synthesized via dissolution-recrystallization mechanism by using ZnO nanosheet array as the template, and is used for the first time as the photocathode for PEC reduction of CO 2 . The effect of ZnSe loading amount on PEC responses of composite electrode is investigated in detail. Under the irradiation of visible light, the optimized ZnO@ZnSe photocathode exhibits onset potentials at 0.39 V ( vs. RHE) in CO 2 -purged 0.5 M NaHCO 3 solution and achieves the photocurrent of 1.17 mA cm -2 at −0.11 V ( vs. RHE). Interestingly, the competitive H 2 evolution reaction can be suppressed effectively and thereby the selectivity for CO 2 reduction reactions especially for CO formation is increased when the applied voltage became more negative. The faradic efficiency of CO increases dramatically from 4.2% at 0.2 V to 52.9% at −0.4 V and the electron selectivity for CO 2 reduction increases from 70.1% to 96.6% accordingly. These results demonstrate that ZnO@ZnSe composite electrode can work as promising photocathode for efficient CO 2 reduction.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
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.
研究领域:
材料科学
·
传感器技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Zhipeng Zhao,Haoming Bao,Qian Zhao,Hao Fu,Le Zhou,Hongwen Zhang,Yue Li,Weiping Cai
Fast and sensitive detection of gaseous volatile organic compounds (VOCs), based on surface-enhanced Raman spectroscopy (SERS), is still a challenge due to their weak interaction with plasmonic metals and overly small Raman scattering cross sections. Herein, we propose a simple strategy to achieve the SERS-based highly efficient detection of trace benzene–VOCs (B-VOCs) based on a composite chip. The composite chip is designed and fabricated via covering the porous zinc oxide on gold nanoarrays by a one-step solution growth method. Such composite chip shows highly selective capture of gaseous B-VOCs (benzene, toluene, nitrobenzene, xylene, and chlorobenzene, etc.), which leads to the rapid and sensitive SERS responses to them. Typically, this chip can response to gaseous toluene within 30 s, and the lowest detectable concentration is below 10 ppb. Further experiments have revealed that there exists an optimal thickness of the ZnO covering layer for the highly efficient SERS response to the B-VOCs, which is about 150 nm. Also, such a composite chip is recoverable in SERS response and hence reusable. The highly efficient SERS response of the composite chip to the B-VOCs is attributed to the porous structure-enhanced molecular adsorption and the electromagnetic-chemical dual-enhancement mechanism. This work not only presents a practical SERS chip for the efficient detection of the typical B-VOCs but also provides a deep understand the interaction between the B-VOCs and the ZnO as well as the chemical enhancement mechanism.
研究领域:
材料科学
·
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 22
·18001-18009
·
IF 3.201
Jingfeng Wang,Yang Li,Yadong Qiao,Guangzhi Yu,Jinzhu Wu,Xiaohong Wu,Wei Qin,Liang Xu
In this study, metal–organic frameworks (MOFs) are used as a host for Ag species and the template of ZnO to fabricate Ag-embedded porous ZnO nanocomposites (Ag–ZnO NCs) with rich and stable interfaces, which is proven to be a perfect platform for constructing hybrid materials. Remarkably, Ag–ZnO NCs exhibit high catalytic activity for the thermocatalytic decomposition of ammonium perchlorate (AP) under the assistance of ultraviolet and visible light irradiation. The highly enhanced catalytic activity of Ag–ZnO NCs originates from the synergistic effects of thermal-driven thermocatalysis and solar light-driven photocatalysis. Especially, under the irradiation of visible light, the plasmon-induced resonance energy transfer (PRET) between the plasmonic metal Ag and the neighboring semiconductor ZnO enhances the charge carrier generation efficiency and suppresses the bulk recombination in the semiconductor, which are responsible for its outstanding catalytic performance.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）