JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Yanshan Wan,Jibiao Li,Jiupai Ni,Chong Wang,Chengsheng Ni,Hong Chen
Photocatalysis is believed to be an important way of reducing NO pollutant in air and the facet engineering of semiconducting oxides could enhance the efficiency of the photocatalysis. ZnO nanoparticles with different exposed crystalline facets were successfully synthesized using a hydrothermal method and their photocatalytic degradation towards NO was investigated. The crystals from ZnCl 2 precursor were hexagonal mesoporous ones with exposed (0002) facet, while those from zinc acetate were in the form of flakes or wheat ears with enhanced exposure of (10 1 ( − ) 1) facet. Calcination in air imparted an enhanced the textural coefficient of the orientated facets as well as the oxygen defects. The nanocrystals with enhanced (0002) facet and lower flat-band energy did better in photoelectrochemical water-oxidation than those with exposed (10 1 ( − ) 1) facet that showed superior photocatalytic activity (approaching 76.7 ± 0.6% under 365 nm photons) for NO oxidation. According to theoretical calculations, (10 1 ( − ) 1) facet with O termination showed much higher affinity to NO molecules than other configurations, and the oxygen vacancy in ZnO played an minor role in the photocatalytic oxidation of NO. A high quantum efficiency approaching 97.5 ± 1.4% under 275 nm photons was obtained for the ZnO crystals from zinc acetate with mixed (0002) and (10 1 ( − ) 1) facets. This research explores the special characteristics of ZnO with different exposed facets and is important for the future design of highly efficient photocatalyst for hazardous material removal.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Lyu Shuai,Zhang Yuhua,Li Zhe,Liu Xinyue,Tian Zhenfang,Liu Chengchao,Li Jinlin,Wang Li
Metal-support interaction has been one of the main topics of research on supported catalysts all the time. However, many other factors including the particle size, shape and chemical composition can have significant influences on the catalytic performance when considering the role of metal-support interaction. Herein, we have designed a series of CuxO/ZnO catalysts as examples to quantitatively investigate how the metal-support interaction influences the catalytic performance. The electronic metal-support interactions between CuxO and ZnO were regulated successfully without altering the structure of CuxO/ZnO catalyst. Due to the lower work function of ZnO, electrons would transfer from ZnO to CuO, which is favorable for the formation of higher active Cu species. Combined experimental and theoretical calculations revealed that electron-rich interface result from interaction was favorable for the adsorption of oxygen and CO oxidation reaction. Such strategy represents a new direction to boost the catalytic activity of supported catalysts in various applications.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Energy
·
2022
·
IF 19.069
Shuoang Cao,Haojie Zou,Bei Jiang,Meilin Li,Quanping Yuan
Polymer based piezoelectric composite has attracted much attention in recent years due to its applicability in the manufacture of piezoelectric nanogenerators and sensors, high piezoelectric performance, high flexibility and easily shaping properties. In this work, ZnO with good piezoelectric properties was grown on the exfoliated MoS 2 nanosheets by employing in situ polymerization , which was then incorporated in PVDF to prepare PVDF/MoS 2 @ZnO piezoelectric composite film . The effect of various contents of ZnO on its structure and properties was emphatically discussed, as well as the mechanical energy collection and sensing performance. The results show that ZnO has been deposited on the surface of MoS 2 nanosheet to form heterostructure (MoS 2 @ZnO), as well as that the MoS 2 @ZnO can effectively promote the transformation from α phase to β phase in PVDF, by which the content of β phase can be increased from 6.2 ± 2.5 % to 54.3 ± 2.7 %. It also exhibits excellent mechanical performance and flexibility with the tensile strengthen of 37.64 ± 5.12 MPa and elongation at break of 9.77 ± 1.57 %. The longitudinal piezoelectric constant ( d 33 ) of the composite film reached a maximum value of 31 ± 4 pC·N -1 . The open-circuit voltage (V OC ) and short-circuit current (I SC ) of PVDF/MoS 2 @ZnO piezoelectric composite film reach as high as 6.22 V and 528 nA under the acting force of 100 KPa, respectively. It can charge a 1.0 μF commercial capacitor to 1.81 V in 400 s. Finally, a flexible piezoelectric sensor was fabricated to collect the pressure signals induced from human body movement (the bending of fingers, wrists and elbow joints), presenting excellent sensitive piezoelectric response with the V OC of about 0.41 V, 0.22 V and 0.32 V, respectively. The found performance indicates its feasibility for the application in wearable intelligent devices.
研究领域:
材料科学
·
纳米技术
·
能源与环境
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2015
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IF 3.368
Chao Jin,Guanglei Liu,Lianhai Zu,Yao Qin,Jinhu Yang
In this article, we report a novel Ag@Ag 3 PO 4 @ZnO ternary heterostructures synthesized through a three-step approach. Firstly, single-crystalline Ag nanorods are fabricated and served as the templates for subsequent Ag 3 PO 4 deposition. Secondly, Ag 3 PO 4 crystals are grown around Ag core nanorods through a solution co-precipitation process, leading to the Ag@Ag 3 PO 4 binary heterostructures. Finally, ZnO nanorod arrays on the surface of the Ag@Ag 3 PO 4 heterostructures are realized via a seeded growth strategy, forming the typical Ag@Ag 3 PO 4 @ZnO ternary heterostructures. The photodegradation of rhodamine B under ultraviolet–visible light irradiation indicates that the Ag@Ag 3 PO 4 @ZnO ternary heterostructures exhibit much higher activities than pure Ag 3 PO 4 and binary heterostructures of Ag@Ag 3 PO 4 . The higher photocatalytic activity of the Ag@Ag 3 PO 4 @ZnO composites may be attributed to the effective photogenerated charge separation at heterointerfaces of Ag/Ag 3 PO 4 and Ag 3 PO 4 /ZnO, and the rapid electron transport along one-dimensional Ag and ZnO nanorods.
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
Chemosensors
·
2024
·Vol. 12
·期 3
·43
·
IF 3.7
Yi Li,Boyu Zhang,Juan Li,Zaihua Duan,Yajie Yang,Zhen Yuan,Yadong Jiang,Huiling Tai
The NH3sensor is of great significance in preventing NH3leakage and ensuring life safety. In this work, the Pd-decorated ZnO hexagonal microdiscs are synthesized using hydrothermal and annealing processes, and the gas sensor is fabricated based on Pd-decorated ZnO hexagonal microdiscs. The gas-sensing test results show that the Pd-ZnO gas sensor has a good response to NH3gas. Specifically, it has a good linear response within 0.5–50 ppm NH3at the optimal operating temperature of 230 °C. In addition, the Pd-ZnO gas sensor exhibits good repeatability, short response time (23.2 s) and good humidity resistance (10–90% relative humidity). This work provides a useful reference for developing an NH3sensor.
研究领域:
材料科学
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传感器技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xinhong Zhao,Yu Tao,Jixiang Dong,Yongchu Fang,Xiaoxian Song,Zaoxue Yan
Wearable, portable, and biocompatible optoelectronic devices made of all-green and abundant materials and fabricated by low-temperature solution method are the key point in the development of next generation of intelligent optoelectronics. However, this is usually limited by the weaknesses of mono-component materials, such as non-adjustable photoresponse region, high carrier recombination rate, high signal-to-noise ratio, as well as the weak mechanical flexibility of bulk films. In this work, the Cs3Cu2I5/ZnO heterostructure flexible photodetectors were constructed by a low-temperature solution method combined with spin-coating technique. The heterostructure combines the low dark current and strong deep ultraviolet absorption of Cs3Cu2I5 quantum dots with the high carrier mobility of ZnO quantum dots as well as the efficient charge separation of the vertical p–n junction, to improve the photodetection performance. The heterostructure shows enhanced light/dark current ratio and ultraviolet-to-visible rejection ratios. Under an illumination of 280 nm light, an optical detectivity as high as 1.26 × 1011 Jones was obtained; the optical responsivity and response time are much better than those of control devices. After 300 times of 180° bending cycles, the photocurrent had no obvious change. The results demonstrate that the Cs3Cu2I5/ZnO heterostructure has great potential in wearable and portable visible-blind ultraviolet optoelectronic devices.
研究领域:
材料科学
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS
·
2019
·Vol. 19
·期 4
·830
·
IF 3.031
Jing Han,Dong Li,Chunmao Zhao,Xiaoyan Wang,Jie Li,Xinzhe Wu
A thin film of polyvinylidene fluoride-trifluoroethylene (PVDF-TrFE) has good flexibility and simple preparation process. More importantly, compared with PVDF, its piezoelectric β-phase can be easily formed without mechanical stretching. However, its piezoelectricity is relatively lower. Therefore, at present, PVDF-TrFE is always compounded with other kinds of piezoelectric materials to solve this problem. The effect of nano-ZnO doping amount on the sensing characteristics of the piezoelectric films was studied. PVDF-TrFE/nano-ZnO films with different nano-ZnO contents were prepared by spin coating process and packaged. The dispersion of nano-ZnO dopants and the crystallinity of β-phase in piezoelectric films with different nano-ZnO contents were observed by scanning electron microscopy and X-ray diffraction, and the piezoelectric strain constants and dielectric constants were measured, respectively. The effect of different nano-ZnO contents on the output performance of the piezoelectric sensor was obtained by a series of impact experiments. The results show that the piezoelectric strain constant and dielectric constant can be increased by doping nano-ZnO in PVDF-TrFE. Moreover, the doping amount of nano-ZnO in PVDF-TrFE is of great significance for improving the piezoelectric properties of PVDF-TrFE/nano-ZnO thin films. Among the prepared piezoelectric films, the output voltage of PVDF-TrFE/nano-ZnO piezoelectric sensor with 7.5% nano-ZnO doping amount is about 5.5 times that of pure PVDF-TrFE. Thus, the optimal range of the doping amount for nano-ZnO is about 4–10%.Keywords:piezoelectric;PVDF-TrFE;nano-ZnO;flexion sensor
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 24
·13696-13704
·
IF 3.049
Hong Lei,Ruheng Zheng,Yeping Liu,Jiacheng Gao,Xiang Chen,Xiaoliang Feng
Hydrogenation of CO2 to chemicals is of great importance in the reduction of greenhouse gas emission. And the interaction and/or the boundary between Cu and ZnO played a crucial role in the performance of the Cu–ZnO catalyst for CO2 hydrogenation to methanol. In this work, cylindrical shaped ZnO was first synthesized via controlled hydrothermal precipitation of Zn(CO2CH3)2·2H2O, and Cu was further deposited on ZnO via in situ reduction in aqueous solution. Characterizations indicated that the crystallization degree of ZnO decreased with the increasing content of Cu, while the exposed surface area of Cu exhibited a volcano shaped curve. It was found that the cylindrical shaped ZnO combined Cu catalysts were active for the hydrogenation of CO2, and the space time yield of methanol reached 0.50 g-MeOH (g-cat h)−1 at H2/CO2 = 3, 240 °C, 3.0 MPa, and 0.54 mol (g-cat h)−1, but the methanol selectivity decreases with the reduction of the (002) polar plane of ZnO. The conversion of CO2 and methanol selectivity were discussed with the detected exposed Cu surface area and the number of oxygen vacancies.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xiaofan Qin,Jing Chen,Haiyang Dai,Yang Yang,Guilin Song,Renzhong Xue,Tingting Zhang,Tao Li
Three series of polyimide (PI)/ZnO composite films were prepared and how their dielectric and energy storage performance is affected by particle size of the nano-ZnO fillers for the films has been systematically investigated. The EDS findings indicate that nano-ZnO particles tend to aggregate in the PI matrix with the increasing ZnO-doping amount, and the nano-ZnO particles with smaller size are more likely to aggregate with the same doping amount due to their higher activity. Profiting from the interface polarization effect between PI matrix and nano-ZnO fillers, the dielectric constant can be improved by incorporating an appropriate number of nano-ZnO fillers, but reduced by excessive doping due to the aggregation of nano-ZnO particles. The experimental results show that the dielectric properties and breakdown strength of these films are closely related to nano-ZnO particle size. For instance, the dielectric constant reaches the maximum value when the content of ZnO-30nm fillers is 0.1 wt %, but mounts to the maximum values as the fillers content for ZnO-50nm and ZnO-90nm is 0.2 wt %. The breakdown strength of PI/ZnO composite films shows a decreasing trend with increasing ZnO-30nm fillers content, while a trend of first increasing and then decreasing with increasing ZnO-50nm and ZnO-90nm fillers content, reaching the highest value when the doping amount is 0.2 wt%, respectively. The PI/ZnO-90nm films exhibit the optimal energy storage performance, and the film with 0.2 wt % ZnO content shows an U d of 4.05 J·cm −3 with an energy efficiency of 75 % under electric field strength of 425 kV/m. Positron annihilation lifetime spectroscopy (PALS) has been applied to study the free volume characteristics, and the correlation between interface free volume and electrical breakdown performance of PI/ZnO films has been explained.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Xiangjia Liu,Jin Li
In this study, a ZnO/NiS@NiO/rGO (ZNNG) composite was characterized using X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and scanning electron microscopy (SEM). Compared with simple ZnO, ZNNG exhibited stronger green emissions, but no ultraviolet (UV) emission peak was observed. Through a comprehensive analysis of ultraviolet–visible (UV–vis) absorption spectra, Mott Schottky (MS) plots, electron paramagnetic resonance (EPR) spectra, and X-ray photoelectron spectroscopy (XPS) results, it was proved that the stable green emissions of ZnO and its composites originated from the quenching of electrons between Zn interstitial ( Zn i ) and surface oxygen defects. The introduction of NiS@NiO caused the conduction band (CB) and valence band (VB) of ZnO to change to lower energy states, effectively increasing the absorption intensities of ZnO in the visible light, while introducing numerous oxygen-related defects on the surface of ZnO. Further addition of rGO effectively promoted the migration of electrons from the CB to the Fermi energy (E f ). These effects effectively increased the green emission of ZnO and reduced the UV emission. Finally, a proper mechanism for the near-zero band gap NiS@NiO/rGO that can significantly enhance the green emission of ZnO was proposed.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2022
·Vol. 132
·期 23
·
IF 2.877
Peng Yanyan,Jiang Dayong,Zhao Man
Photodetectors (PDs) that combine inorganic semiconductors with organic lead halide perovskites to produce broader spectral responses have captured great interest from researchers; however, the imperfect perovskite crystallinity and the defects on the film surface are still the main factors inhibiting the PD's capability. Here, we proposed a simple method by introducing ionic liquid [1-butyl-3-methylimidazolium iodide (BMII)] into ZnO/CH 3 NH 3 PbI 3 to encourage the growth of perovskite grains, raise the crystallinity of perovskite, and reduce the trap states, finally enhancing the photoelectric performances. After the addition of BMII, there are 171-fold, 74-fold, and 76-fold increases, respectively, in the light–dark current ratio, the spectral responsivity, and the external quantum efficiency, meanwhile, detectivity can reach 2.58 × 10 13 Jones in the UV–vis range. The impressive results can be owed to the higher carrier concentration of ZnO/CH 3 NH 3 PbI 3 with BMII, which can facilitate the charge transfer and suppress the recombination of photogenerated carriers. This study may be of assistance to extend our knowledge of developing high-performance PDs.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Journal of CO2 Utilization
·
2019
·
IF 5.189
Yuhai Sun,Chunlei Huang,Limin Chen,Yujun Zhang,Mingli Fu,Junliang Wu,Daiqi Ye
Plate-like ZnO, dominantly exposed (002) polar facet, supported Cu catalysts were prepared by impregnation method as model catalysts for CO 2 hydrogenation to methanol under the real reaction conditions. The catalysts were thoroughly characterized by Scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), in situ Raman spectra , Temperature-programmed reduction (H 2 -TPR) and CO 2 Temperature-programmed desorption (CO 2 -TPD). Catalyst microstructures can be obviously tuned through the increasing of Cu content, interface constituted by Cu-Plate ZnO direct contact, interface constituted by Cu (on ZnO) covered by migrated ZnO x and interface constituted by isolated Cu nanoparticles covered by migrated ZnO x . These microstructures displayed different catalytic performance for CO 2 hydrogenation to methanol; among them, interface caused by the migrated ZnO x covered Cu nanoparticles should play vital roles for methanol production.
研究领域:
催化化学
·
材料科学
✓ 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）