CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Shuaifei Mao,Jiantong Ge,Lingling Zhang,Yannan Dai,Sheng Jiang,Yafei Chen,Chunli Jiang,Chunhua Luo,Bobo Tian,Hechun Lin,Hui Peng,Chun-Gang Duan
The advent of artificial photoelectric synapse devices has attracted considerable attention due to their potential to reshape the landscape of neuromorphic computing. A critical challenge impeding their wider application is the typically short image retention time these devices exhibit. In this study, a strategy is developed to address this obstacle by combining the formation of heterojunction and defect-trapping effects. A Cu 2 ZnSnS 4 (CZTS) film is prepared via low-temperature annealing to form a type II heterojunction with ZnO . The two-terminal device based on this heterojunction shows excellent synaptic functionality. The wide absorption of CZTS film in the visible light spectrum enables the device to achieve a broadband response, which is crucial for realizing the simulation of Pavlov’s associative memory. Its utility in encoding encrypted information is demonstrated through the capability to simulate Morse code. Most importantly, the device exhibits image memory for periods exceeding 1100 s, highlighting its exceptional performance in visual memory retention. These results contribute to the development of CZTS-based photoelectric synaptic devices with broad response characteristics and non-volatile memory capabilities.
研究领域:
材料科学
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神经形态计算
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光电技术
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产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 17
·2200541
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IF 6.389
Linfeng Li,Xi Wu,Xiaomeng Zhu,Yuanyuan Li,Liyi Zou,Xiuli Wang,Wenbin Li,Xiaomin Cheng
Conventional plain organic or inorganic shell for microcapsules has their own drawbacks, the organic shell has defects in thermal conductivity and stability; while the compactness and coverage of inorganic shell are not satisfactory. Herein, a novel approach to synthesis of organic–inorganic composite double-layer shell phase change microcapsule (DLSPCM) is proposed, which is achieved by forming inorganic outer shell on the surface of organic shell via atomic layer deposition (ALD). Taking the pristine microcapsule with paraffin core and melamine formaldehyde (MF) shell as an example, MF-ZnO composite double-layer shell (DLS) is formed in this paper. The melting enthalpy of DLSPCM obtained by 100 ALD cycles is 159.7 J g −1 , which is only 12.1 J g −1 lower than that of paraffin @ MF microcapsules (control sample), while the thermal conductivity of DLSPCM surges by 77.8%, and the thermal energy storage ability and thermal regulation performance are basically maintained. After 900 thermal cycles, the heat storage capacity of DLSPCM obtained by 100 ALD cycles decreased by only 3%. Besides, the photocatalytic performance and antibacterial activity of ZnO-reinforced DLSPCM are further confirmed. The successful design of DLSPCM via ALD is prospective for the encapsulation, modification, and reinforcement of phase change microcapsules.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2023
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IF 1.2
Gulgina Mamtmin,Patima Nizamidin,Reyanggu Abula,Abliz Yimit
Composite optical waveguide sensors show immense potential for the trace-level detection of harmful gases owing to their high sensitivity. Herein, we prepared a highly sensitive ZnO film/K + ion-exchanged composite optical waveguide sensor by fixing a thin ZnO film layer on the surface of a K + ion-exchanged glass optical waveguide. To study the influence of the preparation method on the gas sensitivity of the sensing element, 5,10,15,20-tetrakis-(4-methoxyphenyl)porphyrin was used as a sensing layer on the surface of the ZnO film and fixed via the spin-coating and immersion methods. The gas sensitivity of the sensors prepared by the two methods was comparatively studied. The sensor elements prepared by the immersion method showed higher sensitivity than those prepared by the spin-coating method. Furthermore, the reasons for the difference in the gas sensitivity are discussed in detail. The experimental results show that the as-prepared sensor can detect ppt levels of H 2 S and SO 2 gases and has potential application in the detection of trace levels of sulfide gases in the environment and in industrial production.
研究领域:
材料科学
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环境科学
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光学工程
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DOI
高影响因子
Materials Letters-X
·
2021
·
IF 0
Yan-Ming Chen,Jie Gao
Zinc oxide (ZnO) nanoparticles were synthesized by solution chemistry method with n-hexanol as solvent. The synthesized ZnO nanoparticles were characterized by Ultraviolet–visible spectroscopy, transmission electron microscope and X-ray powder diffraction, and the growth kinetics was studied by Lifshitz, Slyozov and Wagner model. The effects of temperature, the addition of deionized water and the concentration of zinc acetate dihydrate on the synthesis of ZnO nanoparticles were investigated. The results show that the nucleation and growth of ZnO nanoparticles were promoted by the addition of small amount of water, and the size of synthesized ZnO nanoparticles could be controlled by changing the amount of water addition and the concentration of zinc acetate dihydrate.
研究领域:
材料科学
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纳米技术
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产品关联
DOI
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Jingjing Liu,Yu Peng,Bicheng Zhu,Youji Li,Liuyang Zhang,Jiaguo Yu
Triethylamine , as a typical gas of volatile organic compounds, is a growing threat to human health due to its extensive applications in industry. In this study, ZIF-8 derived ZnO polyhedrons are decorated by CsPbBr 3 quantum dots via electrostatic adsorption. Then a highly sensitive sensor towards triethylamine based on ZnO-CsPbBr 3 composite is successfully fabricated. Compared with sensors based on pristine ZnO and ZnO (nanoparticles)-CsPbBr 3 , ZnO-CsPbBr 3 displays a higher response value (~ 60 towards 100 ppm of TEA), shorter response/recovery time (2/18 s), and lower detection limit (5 ppb). Thus, highly-sensitive detection and efficiently-catalytic oxidation of trimethylamine can be achieved. Such distinguished performance can be ascribed to its unique architecture and n-n heterojunction . Notably, the sensing mechanism is thoroughly interpreted by X-ray photoelectron spectroscopy, temperature programmed desorption of O 2 and in-situ diffuse scattering Fourier transform infrared spectra.
研究领域:
材料科学
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化学传感器
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产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 8
·1817
·
IF 4.2
Zhihao Tang,Yonggang Yang,Weiqi Wei
Herein, a series of ZnO-doped lignin-based carbons (LC/ZnO) were successfully prepared from different types of lignin and used for methyl orange (MO) photocatalytic degradation. The apparent morphology, internal structure, and photoelectric properties of prepared LC/ZnO composites and their effects on subsequent MO photocatalytic degradation were investigated by various characterization techniques. The results showed that the LC/ZnO composites that were prepared in this work mainly consisted of highly dispersed ZnO nanoparticles and lignin-based carbon nano-sheets, which were beneficial for subsequent photogenerated electrons and holes formation, dispersion, and migration. The MO could be significantly degraded with various ZnO-doped lignin-based carbons, especially over the LCSL/ZnO, and the maximum degradation rate was 96.9% within 30 min under the simulated 300w sunlight exposure. The experiments of free radical elimination showed that the photocatalytic degradation of MO over LC/ZnO were a result of the co-action of multiple free radicals, and h+might play the predominant roles in MO degradation. In addition, the pH of the solution had little effect on MO degradation, and the MO could be effectively degraded even in an alkaline solution of pH = 12.0. The cycling experiments showed that the prepared LC/ZnO had a good stability for MO photodegradation, especially for LCSL/ZnO, even after 5 times recycling, and the degradation rate of MO only dropped from 97.0% to 93.0%. The research not only provided a fundamental theory for the efficient photocatalytic degradation of MO by LC/ZnO composites, but also offered a new insight into lignin valorization.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
PubMed
高影响因子
Micromachines
·
2021
·Vol. 12
·期 6
·602
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IF 2.891
Mingran Liu,Yang Liu,Limin Zhou
With the development of human healthcare devices, smart sensors, e-skins, and pressure sensors with outstanding sensitivity, flexibility, durability and biocompatibility have attracted more and more attention. In this paper, to develop a novel flexible pressure sensor with high sensitivity, different poly (vinylidene fluoride-trifluoroethylene) (PVDF-TrFE)-based composite membranes were fabricated, characterized and tested. To improve the β-phase crystallinity and piezoelectricity of the membranes, and for the purpose of comparison, nano ZnO particles with different concentrations (99:1, 9:1 in a weight ratio of PVDF-TrFE to ZnO) were, respectively added into PVDF-TrFE polymer acting as a nucleating agent and dielectric material. To facilitate the formation of β-phase crystal, the membranes were fabricated by electrospinning method. After the electrospinning, an annealing process was conducted to the fabricated membranes to increase the size and content of β-phase crystal. Then, the fabricated PVDF-TrFE membranes, acting as the core sensing layer, were, respectively built into multiple prototype sensors in a sandwich structure. The sensitivity of the prototype sensors was tested by an auto-clicker. The stimulation of the auto-clicker on the prototype sensors generated electrical signals, and the electrical signals were collected by a self-built testing platform powered by LabVIEW. As a result, combining the addition of ZnO nanofillers and the annealing process, a highly sensitive pressure sensor was fabricated. The optimal peak-to-peak voltage response generated from the prototype sensor was 1.788 V which shows a 75% increase compared to that of the pristine PVDF-TrFE sensor. Furthermore, a human pulse waveform was captured by a prototype sensor which exhibits tremendous prospects for application in healthcare devices.Keywords:PVDF-TrFE;PVDF-TrFE/ZnO;β phase crystal;human pulsation sensor
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2017
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IF 3.133
Jingjing Jiang,Kai Zhang,Xiaodong Chen,Fei Zhao,Tengfeng Xie,Dejun Wang,Yanhong Lin
In this study, Ce-doped ZnO photocatalysts are successfully prepared by using a simple and facile one-pot water bath method. The as-prepared samples are characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), ultraviolet–visible (UV–Vis) diffuse spectroscopy and Brunauer-Emmett-Teller (BET) surface area analysis. It is found that the as-synthesized Ce-doped ZnO possessed hollow porous structure, high surface areas and large pore volumes . The photocatalytic degradation efficiency (99%) of methyl orange (MO) with an optimal molar ratio of 0.3% Ce-doped ZnO is realized. The separation behavior of photogenerated electrons-holes pairs was investigated by surface photovoltage (SPV) and transient photovoltage (TPV) technique. The results illuminate that Ce element in Ce-doped ZnO tremendously promotes the separation of charges and inhibits the recombination of photogenerated charge carriers, corresponding to the excellent photocatalytic performance.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2018
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IF 5.158
Hao Yang,Qingxia Zhang,Ying Chen,Yong Huang,Fang Yang,Zhong Lu
ZnO coated fabrics have attracted wide attentions due to their antibacterial and photocatalytic self-cleaning properties. However, the photo-response of ZnO only in ultraviolet region limits its application. In this paper, ZnO/BiOBr functionalized cotton fabrics were synthesized by a facile and time-saving ultrasonic-microwave combined method. Compared with ZnO coated fabric, the photocatalytic activity of ZnO/BiOBr coated fabric under visible light irradiation was remarkably improved at no sacrifice of its antibacterial activity. Simultaneously, it also showed good resistance to bacterial adhesion and photocorrosion. The introduction of two-dimensional BiOBr nanoflakes not only enhanced the visible light absorption, but also reduced the recombination rate of electron-hole pairs, thus significantly improving the photocatalytic self-cleaning performance of the coated fabric under visible light irradiation. The ZnO/BiOBr coated cotton fabric with both antibacterial and self-cleaning functionalities may have broad application prospects in the fields of textile, medicine and chemical industry.
研究领域:
材料科学
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纺织工程
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环境科学
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Gang Shu,Dan Xu,Songtao Xie,Li-Jen Chang,Xinyue Liu,Jianqing Yang,Yunchun Li,Xianxiang Wang
This study aimed to develop a novel ZnO-quantum dots-Chitosan biocomposite dressing (CS-ZnO QDs) with improved antioxidant, antibacterial, and potential infected wound healing effects. CS-ZnO QDs were synthesized successfully by incorporating ZnO QDs into chitosan, and in vitro antioxidant, antibacterial and anti-biofilms tests were conducted. Furthermore, the therapeutic effects of CS-ZnO QDs for infected wound healing were investigated. The results of the character study revealed steady compatibility between chitosan and ZnO QDs. Nonetheless, the in vitro antioxidant and antibacterial studies showed that CS-ZnO QDs had better antioxidant activity, inhibitory effects against methicillin-resistant Staphylococcus aureus (MRSA), and a vigorous eradication of bacterial biofilms compared to ZnO-QDs and CS alone. CS-ZnO QDs presented stable cyto-compatibility in NIH/3T3s cells. In addition, CS-ZnO QDs facilitated MRSA-infected wound healing by inhibition of bacterial growth, regulation of the NFκB-p65 pathway to alleviate inflammation, improve wound repairing in an adequate environment, and directly enhance re-epithelialization and collagen deposition.
研究领域:
生物材料学
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医学
·
微生物学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2016
·
IF 4.012
Xianghai Song,Yuanfeng Wu,Fufeng Cai,Donghui Pan,Guomin Xiao
A series of efficient and low-cost Li/ZnO catalysts were prepared by a simple impregnation method and investigated for the synthesis of glycerol carbonate (GC) from the transesterification of glycerol with dimethyl carbonate (DMC). The Li/ZnO catalysts were characterized using XRD, SEM, FT-IR, TG-DSC, TPD and XPS. It was found that the basicity of the catalysts highly depended on the Li loading and calcination temperature. The weak and moderate basic sites on the catalyst surfaces originated from the ZnO and Li + interaction. The strong basic sites were attributed to the substitution of Zn 2+ by Li + in the ZnO lattice, which led to straining of Zn-O bonds and the formation of [Li + O − ] species. It was the strong basic sites rather than the weak and moderate basic sites that catalyzed the transesterification of glycerol with DMC. The highest catalytic activity was observed over the ZnO loaded with 1 wt.% LiNO 3 and calcined at 500 °C. Glycerol conversion of 97.40% and GC yield of 95.84% were obtained over this catalyst at 95 °C in 4 h.
研究领域:
催化化学
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材料科学
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绿色化学
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产品关联
DOI
高影响因子
ChemNanoMat
·
2020
·Vol. 6
·期 3
·470-479
·
IF 3.384
Qingrui Luan,Qifeng Chen,Jie Zheng,Ruifang Guan,Yanfen Fang,Xun Hu
Graphical Powered by the Sun : The formation of 2D-ZnS@ZnO Z-scheme heterostructures and introduction of zinc interstitial defects into ZnO was successfully achieved through a facile in-situ ion-exchange hydrothermal method. The photocatalysts exhibited high photocatalytic activity for hydrogen evolution. Heterostructure and defects in photocatalyst play highly important role in photocatalysis. Formation of 2D-ZnS@ZnO Z-scheme heterostructure and introduction of zinc interstitial defects into ZnO were successfully achieved through a facile in-situ ion-exchange hydrothermal approach, and the photocatalysts exhibited high photocatalytic activity for hydrogen evolution. The heterointerface between the highly ordered ZnO core and disordered ZnS shell, and the zinc interstitial, facilitate the transfer and separation of charge carriers, resulting in high photocatalytic activity. The 2D-ZnS@ZnO photocatalyst with a disordered ZnS layer of about 8 nm in thickness exhibited a photocurrent density about 7.2 times than that of ZnO, which is mainly attributed to the facilitative effect on interface transfer and the increased charge density. In addition, the photocatalytic activity can be adjusted via changing the thickness of the disordered ZnS overlayer. This work provides a strategy for the design of the heterointerface photocatalysts combined with defect engineering, through which the photocatalytic activity can be remarkably improved.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）