JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 10
·7543-7558
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IF 2.779
Duan Mengtian,Wu Daoxin,Wu Jialun,Tong Haixia
A precipitation process was used to produce Ag 3 PO 4 with an irregular small polyhedral structure and an average size of 200–300 nm. Furthermore, using a simple dissolution precipitation technique, polyhedral Ag 3 PO 4 was successfully deposited on the surface of ZnWO 4 . XRD, SEM, TEM, XPS, UV–Vis DRS, and FT-IR spectroscopy were employed to analyze ZnWO 4 /Ag 3 PO 4 composites. The photocatalytic oxidation ability of composites was assessed using Rhodamine B dye degradation model. The results revealed that ZnWO 4 /Ag 3 PO 4 composite material displayed improved visible-light photocatalytic activity, with 7% ZnWO 4 /Ag 3 PO 4 exhibiting the maximum photocatalytic activity. The degradation rate of RhB was 94.0% after 120 min of visible-light irradiation. Nyquist plot indicates that 7% ZnWO 4 /Ag 3 PO 4 composites show the smallest diameter, suggesting a more effective separation of photogenerated electron–hole pairs and faster interface charge transfer. The photocatalytic activity of ZnWO 4 /Ag 3 PO 4 composites does not deteriorate considerably after four cycles, indicating their high stability. The active species capture tests show that h + and •OH are possible reactive species in the degradation reaction. Finally, the p-n heterojunction mechanism is proved by the discussion of the band structure. This study demonstrates that ZnWO 4 /Ag 3 PO 4 photocatalytic composites can be utilized to degrade contaminants.
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
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2015
·
IF 1.955
Geping He,Huiqing Fan,Longtao Ma,Kaige Wang,Donghai Ding,Chao Liu,Zhiwei Wang
The ZnWO 4 nanorods were fabricated by template-free hydrothermal route and characterized by X-ray diffraction, scanning electron microscopy, Raman, fluorescence and UV–visible spectra. The ZnWO 4 nanorods were descended from ZnWO 4 nanosheets with the increase of the pH value. The correlations among these optical spectra were studied and the results showed that the ZnWO 4 nanorods had good crystallinity and few oxygen-vacancy defects comparing with ZnWO 4 nanosheets. Fluorescence emission and UV–visible transmission spectra of ZnWO 4 nanorods were increased, while the fluorescence excitation and UV absorption spectra were decreased in the wavelength region of 250–325 nm. This phenomenon was reversed in the wavelength region of 325–400 nm. The ZnWO 4 nanorods displaying superior photocatalytic activity were suitable to be photocatalytic materials which could absorb selectively ultraviolet in the wavelength of 325–400 nm for their low recombination probability of light excited electron–hole.
研究领域:
材料科学
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纳米技术
·
光学性质
·
光催化
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 28
·13541-13559
·
IF 4.682
He Geping,Wang Di,HuangFu Huijun,Zhang Cunshe,Zhang Ben,Mi Yuanmei,Zheng Donghao
ZnWO 4 nanomaterials are gaining attention as a kind of multifunctional material in the field of electrochemical energy storage and photocatalysis. However, the controllable adjustment of their nanomorphology and bandgap width limit their wide application. So the nanostructured bifunctional Zn 1− x Ce x WO 4 ( x = 0.020, 0.022, 0.030) with tunable nanomorphology and bandgap width were prepared by a simple one-step hydrothermal method in this work. On the one hand, the microscopic morphology of the Zn 1− x Ce x WO 4 was changed from clusters to nanosheets with the addition of Ce 4+ . On the other hand, the doping of Ce 4+ generated oxygen vacancies and formed defect states in the ZnWO 4 semiconductor, reducing the energy bandgap width. Zn 1− x Ce x WO 4 ( x = 0.022) with the optimal doping ratio (nCe/(nCe + nZn) = 0.022) obtained a specific capacitance of 267.091 F g −1 at a current density of 1 A g −1 and an electrolyte of 6 M KOH, which is 3.7 times as great as the specific capacitance of ZnWO 4 (70.545 F g −1 ). In addition, the catalytic efficiency of Zn 1− x Ce x WO 4 ( x = 0.022) for Rhodamine B (RhB) reached 99.541% in 4.5 h. The doping of Ce 4+ can achieve the dual modulation of the morphology and bandgap width of ZnWO 4 , thus enhancing the electrochemical performance and photocatalytic degradation performance of ZnWO 4 . Graphical abstract
研究领域:
材料科学
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环境科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2025
·
IF 4.2
Lijie Gao,Yun Wang,Meiting Li,Xuejiao Wang,Qi Zhu,Ji-Guang Li
ZnWO 4 :Yb 3+ /Er 3+ upconversion (UC) nanophosphors were successfully synthesized by hydrothermal reaction at 180 ℃ and subsequent calcination at 700 ℃ for crystallinity improvement and better incorporation of dopant ions. The phosphors were analyzed to emit green (∼533 nm; 2 H 11/2 → 4 I 15/2 transition of Er 3+ ), green (∼546 nm; 4 S 3/2 → 4 I 15/2 ) and red (∼660 nm; 4 F 9/2 → 4 I 15/2 ) light under 980 nm laser excitation, all through a two-photon process. The incorporation of Na + and K + , especially K + , was found to remarkably modify the UC performance of Er 3+ , in terms of red/green intensity ratio (luminescence color), fluorescence lifetime and thermal stability of luminescence, which was rationalized by considering 4 F 7/2 + 4 I 11/2 → 4 F 9/2 cross relaxation and lattice defects/local structure. The optimal ZnWO 4 :0.08Yb 3+ ,0.02Er 3+ phosphor, which contains ∼ 0.97 at.% Na + and 0.16 at.% K + , was demonstrated to have the potential for optical temperature sensing with the thermally coupled 2 H 11/2 / 4 S 3/2 energy levels of Er 3+ .
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Diming Zang,Xiangyang Wei,Qingyuan Liu,Ying Li,Rui You
The detection of hydrogen sulfide (H 2 S) plays a critical role in environmental monitoring and breath analysis for medical diagnostics. For metal oxide semiconductor film-based gas sensors, the quality of the gas-sensitive material and the method of forming the gas-sensitive film on planar electrodes are critical determinants of sensor performance. In this study, a flower-like ZnO@ZnWO 4 heterojunction was directly grown on the surface of a micro-hotplate for gas sensor applications using a two-step method involving block copolymer self-assembly and chemical vapor deposition. The gas sensors demonstrated exceptional performance in detecting H 2 S over a range of 50 ppb to 50 ppm. At an operating temperature of 200 °C, the gas sensor exhibited a remarkable response value (R=127.31) for 5 ppm H 2 S and an outstanding selectivity coefficient of 117.4. Additionally, the sensor maintained 95 % of its original response value over a month. These superior performance metrics are attributed to the n-n heterostructure between ZnO and ZnWO 4 , along with the extensive specific surface area and the presence of oxygen vacancies in the flower-like morphology. This novel approach not only enhances H 2 S detection performance but also significantly contributes to the development of gas sensors crucial for environmental monitoring and human health protection.
研究领域:
材料科学
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环境科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2024
·
IF 2.8
Xueying Wang,Qian Ma,Yi Wang,Lingyu Li,Dongheng Zhao,Huayushuo Zhang,Bolong Li
Bimetallic MOFs-derived hierarchical WO 3 /ZnWO 4 /CoWO 4 heterostructures were prepared by electrospinning for achieving superior n-butanol-sensing property at low operating temperatures. Porous chain-like structures can gradually transformed into porous mulberry-like structures composed of various accumulated particles as increasing the additive amount of Zn/Co-ZIFs. High selectivity and stability of WO 3 -based composites to 100 ppm n-butanol can be observed at 25 °C, including the large sensitivity of 32 and the fast response/recovery times of 115/179 s. The enhanced gas-sensing performance is primarily ascribed to the increased specific surface area, plentiful polyoxometalate, and effective heterojunctions, obviously promoting surface/interface absorption behavior and electron transport process.
研究领域:
材料科学
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传感器技术
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
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2012
·Vol. 22
·期 44
·23428-23438
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IF 5.968
Liming Sun,Xian Zhao,Chun-Jiang Jia,Yixuan Zhou,Xiufeng Cheng,Pan Li,Li Liu,Weiliu Fan
We present a systematic investigation of the microscopic mechanism of interface interaction, charge transfer and separation, as well as their influence on the photocatalytic activity of heterojunctions by a combination of theoretical calculations and experimental techniques for the g-C3N4–ZnWO4 composite. HRTEM results and DFT calculations mutually validate each other to indicate the reasonable existence of g-C3N4 (001)–ZnWO4 (010) and g-C3N4 (001)–ZnWO4 (011) interfaces. The g-C3N4–ZnWO4 heterojunctions show higher photocatalytic activity for degradation of MB than pure g-C3N4 and ZnWO4 under visible-light irradiation. Moreover, the heterojunctions significantly enhance the oxidation of phenol in contrast to pure g-C3N4, the phenol oxidation capacity of which is weak, clearly demonstrating a synergistic effect between g-C3N4 and ZnWO4. Interestingly, based on the theoretical calculations, we find that electrons in the upper valence band can be directly excited from g-C3N4 to the conduction band, that is, the W 5d orbital of ZnWO4, under visible-light irradiation, which should yield well-separated electron–hole pairs, with high photocatalytic performance in g-C3N4–ZnWO4 heterojunctions as shown by our experiment. The microcosmic mechanisms of interface interaction and charge transfer in this system can be helpful for fabricating other effective hetero-structured photocatalysts.
研究领域:
材料科学
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环境科学
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理论化学
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
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2022
·
IF 6.137
Ling-Ling He,Xiao-Yan Li,Jing-Yi Bai,Song Li,Shuang Qi,Xin Wang,Yu Li
A novel ZnWO 4 /MgWO 4 n-n heterojunction (0.9% ZnWO 4 /MgWO 4 ) was fabricated successfully and characterized by different techniques. The methylene blue (MB) was removed to confirm the sonocatalytic activity by the 0.9% ZnWO 4 /MgWO 4 composite. The sonocatalytic removal ratio of MB using MgWO 4 was 40.04±4.34(%). It was significantly increased to 93.82±3.44(%) in the presence of 0.9% ZnWO 4 /MgWO 4 composite. The significantly improved sonocatalytic performance was due to the form of n-n heterojunction, which could hinder the recombination of electron and hole ( e − - h + ) pairs effectively. The mechanism showed that hydroxyl radical (•OH) and h + had important roles for the elimination of MB. Moreover, the 0.9% ZnWO 4 /MgWO 4 composite had remarkable stability during the process of MB removal under the ultrasonic irradiation. The results suggested that the fabrication of heterojunction is a valid method to promote the sonocatalytic performance of catalyst. The results of this paper would provide valuable references for the development of new sonocatalysts used in environmental remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yongqi Mu,Ran Tao,Yanxin Wang,Yongming Lv,Jiale Li,Tianyang Piao,Xiaoxing Fan
Photocatalytic nitrogen fixation presents a promising method for low-energy and environmentally friendly ammonia production. However, efficiency remains relatively low due to insufficient proton and electron supply during the photocatalytic process. In this study, ZnWO 4 /g-C 3 N 4 S-scheme heterojunction nanofibers are prepared by electrospinning combined with vapor deposition method. The ZnWO 4 /g-C 3 N 4 nanofibers are rich in oxygen vacancies and heterovalent W ions, which work synergistically to protonate water molecules, thereby providing the necessary protons for nitrogen fixation. The matched energy band structures of ZnWO 4 and g-C 3 N 4 form a built-in electric field at contact interface, which effectively separate photogenerated carriers. The one-dimensional nanofiber structure induces the carrier transport along the fiber axis and shortens the diffuse distance for carriers to active sites. As expected, the maximum photocatalytic nitrogen fixation performance of ZnWO 4 /g-C 3 N 4 reaches 144.5 μmol·L -1 ·min −1 ·g −1 , which is 19.5 times higher than that of single-component g-C 3 N 4 . After five cycles of experiments, the performance is 90.8 % of the original, showing significant stability. ZnWO 4 /g-C 3 N 4 also exhibits excellent photocatalytic nitrogen fixation activity and stability in natural river water, with practical application potential. This innovative achievement is expected to be applied in future agricultural production, promoting agriculture towards a greener and lower-carbon direction.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Mingcai Yao,Liang Dong,YuHang Fu,Haijun Li,Guang Luo
We have carefully built a new chloramphenicol (CAP) electrochemical sensor, which takes the zinc tungstate @ cobalt magnetic nanoporous carbon @ molecularly imprinted polymer (ZnWO 4 @Co-MNPC@MIP) as the core. First, we successfully prepared Co-MNPC nanomaterials using an efficient one-step hydrothermal method and a direct carbonization method. Next, we recombined ZnWO 4 with Co-MNPC and synthesized the completely new ZnWO 4 @Co-MNPC complex by using the hydrothermal method. To further improve its performance, we combined ZnWO 4 @ Co -MNPC with a molecular imprinted polymer and coated a molecular imprinted (MIP) shell on the surface of ZnWO 4 @ Co -MNPC by precipitation polymerization. This shell not only gives the sensor a new performance but also gives it a stronger peak current, resulting in a more accurate detection of CAP. Under optimal conditions, the ZnWO 4 @Co-MNPC@MIP (MMIP) electrode has a stronger CAP detection peak current than the one-component electrode, with a fairly wide linear range: 0.007–200 μM and 200–1400 μM. Even more surprisingly, the detection limit is as low as 0.0027 μM, which allows the sensor to maintain excellent selectivity and stability in the face of various interferences, making it an excellent electrochemically modified electrode. Compared to magnetic non-molecular imprint sensors (MNIPs), MMIP sensors have higher detection efficiency. After practical application, we found that the ZnWO 4 @Co-MNPC@MIP modified electrode was satisfactory in milk samples.
研究领域:
分析化学
·
纳米技术
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2019
·
IF 3.218
Yuan Dang,Xiaojiao Wang,Rongrong Cui,Shuangli Chen,Yuanzhen Zhou
A sensitive and selective electrochemical sensor based on poly-(nicotinic acid) (PNA) film and Cd-doped ZnWO 4 (Cd-ZnWO 4 ) nanoneedles organic-inorganic nanocomposite modified carbon paste electrodes (PNA(ii)/Cd(0.02)-ZnWO 4 /CPE) is successfully constructed and applied to study the catalytic oxidation of hydroquinone (HQ) and catechol (CC). X-ray diffraction (XRD), scanning electron microscope (SEM) and electrochemical techniques are used to characterize the composition , morphology and electrochemical properties of the modified electrode . The sensor exhibits strong electrocatalytical activity towards the oxidation of HQ and CC for the higher specific surface area of Cd-ZnWO 4 nanoneedles, fluent electron transfer capacity and the synergistic effect of inorganic Cd-ZnWO 4 and organic PNA. Wide linear ranges are obtained as 1–56 μM for HQ and 2–35 μM for CC, with the detection limits of 0.17 μM and 0.03 μM, in the differential pulse voltammetry (DPV) determination of HQ and CC, respectively. Satisfactory repeatability, stability and anti-interference performance are also achieved on PNA (ii)/Cd(0.02)-ZnWO 4 /CPE. Meanwhile, the proposed sensor realizes the detection of CC and HQ spiked in local tap water samples successfully.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2024
·
IF 12.7
Hui Wang,Haijiao Lin,Shuhong Huang,Ling Li,Youwei Zhao,Wenming Zhang
In spite of the high level of attention paid to multifunctional sensors, the flexible and multifunctionality are still intractable challenges to be tackled. Herein, we design a flexible, hydrophobic and stable multifunctional sensing material by electrostatic spinning of PVDF/ZnWO 4 @PDA (PZP). The incorporation of ZnWO 4 @PDA into PVDF nanofibers can act as an effective nucleating agent and photosensitizer, which increases the polar crystalline phase and photovoltaic properties of PVDF. With the synergy of PVDF and ZnWO 4 @PDA, PZP based piezoelectric sensors offer significantly superior electrical output (28.4 V, 600 nA) and high sensitivity (1.04 V/kPa). Moreover, it is particularly surprising that photoelectric sensor based on PZP textiles has excellent optical properties, as confirmed by the response / recovery time (0.6 s / 0.66 s) of simulated sunlight detection. Piezoelectric photoelectric effect exists in PZP textiles, as evidenced by the significant increase in the strain output current of photoelectric sensor when irradiated with sunlight. Furthermore, based on the coupling of piezoelectric effect and triboelectric effect of PZP composite, the contact out nano-triboelectric generator has enhanced the electrical output and electromechanical conversion efficiency. Therefore, this work has successfully prepared multifunctional sensing materials that integrate pressure sensing, audio recognition, underwater communication, optoelectronic detection and triboelectric energy collection, paving a new way for the flexible multifunctional sensors.
研究领域:
材料科学
·
传感器技术
·
能源转换与存储
✓ 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）