APPLIED ORGANOMETALLIC CHEMISTRY
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2018
·Vol. 32
·期 7
·e4411
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IF 3.581
Xin Jin,Guangrong Liu,Chongzhuo Bao,Mingxin Chen,Qiang Huang
The high dispersion and stability of a nanocomposites suspension are required as a crucial factor in many of their applications. In this study, ZnO nanosheets covered with polyaniline (PANI) thin layer (ZnO@PANI) were synthesized by a simple in-situ polymerization. The as-prepared ZnO@PANI powders were well characterized by XRD, Raman, FTIR, XPS and photoluminescence spectra, as well as SEM and TEM techniques. The effect of PANI incorporation on the chemical dissolution and dispersing stability of ZnO aqueous suspension was investigated. Dissolution experiments showed that the dissolution of ZnO was effectively restrained by the surface-hybridized PANI layer. ZnO@PANI suspension can be more stable in a wider pH range. Dynamic Light Scattering (DLS) analysis indicated that ZnO@PANI particles were thoroughly dispersed in the neutral and alkaline solution as proven by the emergence of a single distribution with a high diffused intensity. Sedimentation experiments suggested that ZnO@PANI suspension was a more stable dispersion taking into account the effect of pH and ionic strength.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 19
·9057-9063
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IF 9.931
Xu Zhang,Yu-Zhu Zhou,De-Yao Wu,Xiao-Hua Liu,Rui Zhang,Hui Liu,Cun-Ku Dong,Jing Yang,Sergei A. Kulinich,Xi-Wen Du
Zinc oxide is a cost-efficient and eco-friendly material for solar-to-chemical energy conversion. However, the relatively wide band gap and poor stability restrict its practical applications. Herein, we report on the modification of ZnO nanosheets with a porous atomically thin ZnS overlayer. The as-prepared ZnS/ZnO/ZnS sandwich nanosheets exhibit a reduced band gap (2.72 eV) and yet a slightly elevated conduction band minimum, which remarkably broadens the wavelength range for light absorption and generates electrons with enough reducing capability. At the same time, the newly-prepared sandwich nanosheets possess alternatively exposed ZnS and ZnO surface patches, which attract and accommodate photo-generated holes and electrons, respectively. In addition, the ZnS overlayer catalyzes and accelerates hole-consumption reactions, thus preserving electrons for efficient water splitting. As a result, the ZnS/ZnO/ZnS sandwich nanosheets demonstrate intensive light absorption, fast charge separation, long electron lifetime, and eventually the highest hydrogen production rate reported for oxide catalysts so far. This work proves that passivation with an ultrathin layer is a potent approach for energy-band engineering, and semiconductor sandwich nanostructures are promising for highly efficient water splitting under sunlight.
研究领域:
材料科学
·
能源转换
·
光催化技术
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DOI
高影响因子
IONICS
·
2024
·
IF 2.4
Chen Pengfei,Li Jin
SnO 2 quantum dots, ranging from 10 to 30%, were combined with ZnO nanosheets to create a heterojunction photocatalyst. This composite was generated using a basic hydrothermal method, which was then followed by high-temperature calcination to enhance the photocatalytic activity of ZnO. The results showed that the synthesized SnO 2 nanoparticles with tetragonal rutile phase and ZnO nanosheets with hexagonal fibrillar zincite phase, the coupling of SnO 2 quantum dots and ZnO nanosheets improved the separation efficiency of the photogenerated carriers, and at the same time broadened the photoresponse range. Through the degradation of the organic dye Rhodamine B (RhB), the best photocatalytic activity was found at 20% amount of SnO 2 in the composite sample (SZ-2), and the degradation efficiency of RhB reached 96.5% at the light irradiation time of 100 min. In addition, an in-depth study of the photocatalytic mechanism of the constructed heterojunction by active group trapping experiments, and the results showed that •O 2 − and h + were the main active substances in this degradation system. Meanwhile, the SZ-2 photocatalyst was tested for five cycles, and the degradation efficiency of the 5th cycle was 72%. The cycle test indicates that the SZ-2 sample is highly stable and reusable. Therefore, the results showed that the prepared SnO 2 /ZnO heterojunction photocatalysts are suitable materials for degrading organic dyes.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2021
·
IF 3.423
Chenggang Chen,Lisha Pan,Hai Li,Qingqing Liu,Fei Li,Jinchun Tu,Aiwu Ding,Kexi Zhang
Carbon-high fly ash (CFA) is a reused solid waste. We herein report a simple method to fabricate superhydrophobic CFA. Superhydrophobicity was achieved by decorating ZnO nanoplates and grafting stearic acid (SA). SEM results showed that the micro–nano was established, wherein ZnO nanoplates grew successfully with ∼10 nm thickness on the CFA surface forming a honeycomb structure. FT-IR results showed that the carboxylic acid of SA reacted with surface hydroxyl of ZnO and CFA by esterification. After modification by SA in the best conditions, the water contact angle of CFA-ZnO-SA reached to 156.2° with the petal effect. The material could be an excellent candidate for hydrophobic application.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Dong Wang,Qian Fu,Jiayi Tian,Hongmiao Zhou,Rui Liu,Difu Zhan,Zhuo Peng,Changcun Han
Zinc oxide (ZnO) has a broad range of applications in piezo-photoelectrochemical water splitting. However, the narrow light absorption range and high photogenerated carrier recombination efficiency make ZnO somewhat limited in applying piezo-photoelectrochemical water splitting. Heterogeneous structure construction is a superior handle to these two drawbacks. Herein, few-layer molybdenum disulfide (MoS 2 ) nanospheres are compounded on ZnO nanosheets (NSs) to form a dual-piezoelectric-material heterojunction of ZnO NSs/MoS 2 . The photocurrent density of ZnO NSs/MoS 2 reaches 0.68 mA/cm 2 at 1.23 V vs. RHE under ultrasonic vibrations. It is 2.4 times higher than that of ZnO NSs under ultrasonic vibrations. The efficient piezo-photoelectrochemical performance is attributed to increased absorption range and polarization field. On the one hand, the narrow band gap of the few-layer MoS 2 widens the light absorption range of ZnO. On the other hand, compared to pure ZnO NSs, ZnO NSs/MoS 2 has an enhanced polarization field under ultrasonic vibrations due to the piezoelectric properties of dual piezoelectric materials, which dramatically accelerates the electron transfer and suppresses the recombination of between electrons and holes. This work provides a new approach to constructing photoelectrodes with effective piezoelectric photocatalytic properties.
研究领域:
材料科学
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能源科学
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产品关联
DOI
PubMed
高影响因子
THIN SOLID FILMS
·
2018
·
IF 1.939
Hao Li,Sirong Yu,Jinhui Hu,Enyang Liu
In this research, a simple and economical method was used to fabricate a superhydrophobic Zn coating with ZnO nanosheets on steel substrates. Electrodeposited Zn coating was firstly formed on the steel substrate for anti-corrosion. Then we used hydrothermal method to process the electrodeposited Zn coating for in-situ growth of ZnO nanosheets. After low-energy modification with pentadecafluorooctanoic acid, the Zn coating with ZnO nanosheets on the steel substrate became superhydrophobicity, with water contact angle of 158° and the sliding angle of about 6°. The prepared superhydrophobic Zn coating with ZnO nanosheets exhibited good stability and excellent self-cleaning property. As a result, this combination method could be utilized in large scale production due to its simplicity and low-cost.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Huiyu Zou,Wuming Wu,Jingjing Zhou,Chunyan Deng
In this study, a novel integrated photoelectrochemical (PEC) sensor platform was proposed, utilizing an optical fiber (OF) as the working electrode for guided in situ light. A CdS quantum dots (QDs)/ZnO nanosheets (NSs) n-n heterojunction was quickly and easily constructed on the OF surface by successive ionic layer adsorption and reaction (SILAR). Au nanoparticles (NPs)@dsDNA as a capturing probe were modified on the CdS QDs/ZnO NSs@OF (CZ@OF). Due to the energy transfer between Au NPs@dsDNA and CdS QDs, the resultant opto-electrode has a lower background near zero, enabling the “signal-on” detection of biomarkers (interleukin-6 (IL-6) as a model). The OF-PEC biosensor demonstrated a wide linear range from 1 to 100 pg mL–1 with a regression coefficient (R2) of 0.9958 and an impressive detection limit (LOD) of 0.19 pg mL–1. More significantly, the proposed OF-PEC can be successfully used for the detection of IL-6 in serum samples from patients with pulmonary arterial hypertension, and it showed consistency and is more sensitive to trace concentrations compared to BD FACSCanto II flow cytometry used at the hospital. This holds significance for an early disease diagnosis. Therefore, the proposed OF-PEC not only achieves integration of the light source and sensing interface but also enables sensitive and accurate “signal-on” detection of IL-6. Furthermore, due to the flexibility and remote detection capabilities of OF, the application of OF-PEC is expected to be expanded more widely. This approach opens up possibilities for advances in PEC sensing.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Zhaolong Xie,Menghuan Chen,Yangshen Chen,Anxiang Guan,Qing Han,Gengfeng Zheng
The direct conversion of methane to value-added chemicals at ambient conditions is a long-awaited perspective, and the electrocatalytic methane oxidation reaction (CH4OR) offers the potential of utilizing abundant natural gas and renewable energy sources. However, due to the competition of water oxidation and the overoxidation of methane, CH4OR has remained as a significant challenge. In this work, we developed Rh/ZnO nanosheets as an effective catalyst for electrochemical conversion of methane into ethanol. The highly dispersed rhodium nanoparticles provided surface sites for methane adsorption, and ZnO allowed presentation of abundant active oxygen species for methane activation. With a 0.6% Rh doping ratio, the Rh/ZnO nanosheets demonstrated an excellent ethanol production rate of 789 μmol·gcat–1·h–1 at 2.2 V versus reversible hydrogen electrode, corresponding to a Faradaic efficiency of 22.5% and an ethanol production selectivity of 85%, suggesting a promising means for methane utilization at ambient conditions.
研究领域:
化学工程
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能源科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Pengpeng Wang,Ding Wang,Minglu Zhang,Yuankun Zhu,Ying Xu,Xiaozhuo Ma,Xianying Wang
ZnO nanosheets/graphene oxide (GO) nanocomposites were synthesized for highly selective, quick response acetone detection. Field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were used to characterize the morphologies, microstructures and compositions of the nanocomposites. The effect of GO on the sensing performances of the nanocomposites was investigated. It was found that 10 wt% GO was the optimized loading and the response value reached 35.8 under the exposure of 100 ppm acetone. The unique sensing properties were attributed to the synergistic effects of rigid ZnO nanosheets and flexible GO, including large specific surface area, rich functional groups of GO etc. This work will contribute to the development of new acetone sensors and broaden the application of GO composite materials.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
MODERN PHYSICS LETTERS B
·
2023
·
IF 1.9
Qian-Qian Zhang,Shu-Yi Ma,Xiang-Bing Li,Fang-Qiang Yuan
The ZnO-10, ZnO-20, ZnO-30, and ZnO-40 nanopetal-shaped samples were successfully synthesized by a hydrothermal method. The results of XRD, SEM, TEM, and BET indicate that the micro–nano petal-like samples have the advantages of high purity, good crystallinity, and large specific surface area. The ZnO-20 sample with the largest specific surface area and pore volume was prepared by adjusting the scheme without changing the sample morphology. The specific surface area and pore volume of the sample were 33.6914 m 2 /g and 0.1561 ml/g. The results of gas sensitivity test show that the sample has the highest response and super good gas sensitivity selectivity. At 250 ∘ C, the responses to 5 ppm and 50 ppm ethylene glycol can reach 14.4 and 293, respectively. Because of the excellent gas performance of ZnO nanosheets, this work can provide a theoretical basis for the research and development of ultra-sensitive ethylene glycol gas sensors in the industry.
研究领域:
材料科学
·
化学工程
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Sensors
·
2024
·
IF 8.2
Chengming Sui,Mingxue Zhang,Yueyue Li,Yilin Wang,Yuanzhen Liu,Ziqi Liu,Jihao Bai,Fengmin Liu,Geyu Lu
Bimetallic nanocrystals (NCs) have obtained significant attention due to their unique advantages of the intrinsic properties of individual metals and synergistic enhancements resulting from the electronic coupling between two constituent metals. In this work, Pd@Pt core–shell NCs were prepared through a facile one-pot solution-phase method, which had excellent dispersion and uniform size. Concurrently, ZnO nanosheets were prepared via a hydrothermal method. To explore their potential in nitrogen dioxide (NO2) gas sensing applications, sensitive materials based on ZnO nanosheets with varying mass percentages of Pd@Pt NCs were generated through an impregnation process. The sensor based on 0.3 wt % Pd@Pt-ZnO exhibited remarkable performance, demonstrating a substantial response (Rg/Ra = 60.3) to 50 ppb of NO2 at a low operating temperature of 80 °C. Notably, this sensor reached an outstanding low detection limit of 300 ppt. The enhancement in gas sensing capabilities can be attributed to the sensitization and synergistic effects imparted by the exceptional catalytic activity of Pd@Pt NCs, which significantly promoted the reaction. This research introduces a novel approach for the utilization of core–shell structured bimetallic nanocrystals as modifiers in metal-oxide-semiconductor (MOS) materials for NO2 detection.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）