Catalysis Science & Technology
·
2021
·Vol. 11
·期 14
·4953-4961
·
IF 6.119
Junyue Li,Ziyi Wang,Huayu Chen,Qiqi Zhang,Huilin Hu,Lequan Liu,Jinhua Ye,Defa Wang
Photocatalytic reduction of carbon dioxide (CO2) into hydrocarbon fuels has attracted increasing research attention in recent years. However, the fast recombination of photoinduced charge carriers and poor adsorption/activation capability of CO2 molecules limit the photoconversion efficiency. Herein, we report on loading a two-dimensional (2D) titanium carbide (Ti3C2) MXene as a noble-metal-free cocatalyst onto zinc oxide (ZnO) via a facile electrostatic self-assembly method for efficient CO2 photoreduction. It is interesting to find that the ZnO loaded with 7.5 wt% of surface-alkalinized Ti3C2 exhibited remarkably improved evolution rates of CO (30.30 μmol g−1 h−1) and CH4 (20.33 μmol g−1 h−1), which were approximately 7-fold and 35-fold those of bare ZnO, respectively. The surface-alkalinized Ti3C2 MXene is believed to play a crucial role in improving the separation/transfer of photoinduced charge carriers and the adsorption/activation of CO2 molecules, accounting for the superior photocatalytic activity of CO2 reduction. Our work demonstrates that the Ti3C2 MXene could be employed as a noble-metal-free cocatalyst for efficient photocatalytic CO2 reduction.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2015
·Vol. 17
·期 26
·17041-17052
·
IF 4.493
Xiangyang Liu,Xiuying Cheng,Shun Wang,Kun Zhang,Yuzong Gu
ZnO films with several microstructures including nanoparticles, nanowire arrays, nanorod arrays and nanotube arrays were prepared using different methods. In2O3 and/or Cu4Bi4S9 were deposited onto each nanostructured ZnO film, and two types of heterostructures (ZnO/Cu4Bi4S9 and ZnO/In2O3/Cu4Bi4S9) as well as solid state dye-sensitized solar cells were fabricated. The signals of steady state and electric field-induced surface photovoltage spectroscopy indicate that all of ZnO/In2O3/Cu4Bi4S9 heterostructures exhibit higher photovoltaic response than the relative ZnO/Cu4Bi4S9. The same type of heterostructure with different ZnO films presents various photovoltaic properties. Transient surface photovoltage spectroscopy can contribute to study the separation and transport mechanism of photogenerated charges. Here, ZnO nanotubes/Cu4Bi4S9 and ZnO nanotubes/In2O3/Cu4Bi4S9 cells exhibit the best performances with the highest efficiencies of 6.2% and 6.8%, respectively. The internal relations of photoelectric properties to some factors, such as film thickness, surface area, microstructure, double energy level matchings, etc. were discussed in detail. Qualitative and quantitative analysis further verified the comprehensive effect and the difference of factors. The exploration to understand the transport mechanism of light-induced charges in composite films will promote the nanocrystal application in solid state solar cells and photovoltaic community.
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PubMed
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JOURNAL OF HAZARDOUS MATERIALS
·
2014
·
IF 4.331
Jun Hou,Lingzhan Miao,Chao Wang,Peifang Wang,Yanhui Ao,Jin Qian,Shanshan Dai
The presence of ZnO NPs in waste streams can negatively affect the efficiency of biological nutrient removal from wastewater. However, details of the toxic effects of ZnO NPs on microbial activities of wastewater biofilms have not yet been reported. In this study, the temporal and spatial inhibitory effects of ZnO NPs on the O 2 respiration activities of aerobic wastewater biofilms were investigated using an O 2 microelectrode. The resulting time–course microelectrode measurements demonstrated that ZnO NPs inhibited O 2 respiration within 2 h. The spatial distributions of net specific O 2 respiration were determined in biofilms with and without treatment of 5 or 50 mg/L ZnO NPs. The results showed that 50 mg/L of nano-ZnO inhibited the microbial activities only in the outer layer (∼200 μm) of the biofilms, and bacteria present in the deeper parts of the biofilms became even more active. Scanning electron microscopy (SEM) analysis showed that the ZnO NPs were adsorbed onto the biofilm, but these NPs had no adverse effects on the cell membrane integrity of the biofilms. It was found that the inhibition of O 2 respiration induced by higher concentrations of ZnO NPs (50 mg/L) was mainly due to the release of zinc ions by dissolution of the ZnO NPs.
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高影响因子
VACUUM
·
2023
·
IF 4
Zhen Zhao,Lei Zhang,Yinghua Zhuang,Yang Guo,Hongming Zhang,Wanli Jiao
To achieve rapid detection of hydrogen sulfide (H 2 S) gas at lower temperatures, We present a high-performance PdO/ZnO/ZnS-based H 2 S gas sensor, which was synthesized using a hydrothermal synthesis method in conjunction with an in situ sulfuration process and surface modification by PdO. Vacuum sintering to prevent high temperature oxidation of ZnS. The introduction of PdO not only makes the sheet ZnO/ZnS turn to spherical-like, but also increased the content of adsorbed oxygen. Compared with ZnO/ZnS sample, the PdO/ZnO/ZnS based sensor exhibited a higher response value of 212.4 to 10 ppm H 2 S at lower temperature of 100 °C, with response and recovery times of 2.9 and 1.7 min, respectively. In addition, excellent performance is demonstrated in terms of gas selectivity , repeatability and long-term stability during testing.
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NANOTECHNOLOGY
·
2023
·Vol. 34
·期 50
·505704
·
IF 3.5
Yuhang Chen,Qi Xue,Weiguo Luo,Yu Sun,Ming Li,Tao Hang
Zinc oxide quantum dots (ZnO QDs) have gained wide attention due to their wide excitation spectrum, large Stokes shift, adjustable photoluminescence (PL) spectrum, and excellent biocompatibility. However, low fluorescence intensity and poor stability restrict their further applications. In this work, zinc sulfide (ZnS) as a surface modifier, ZnO/ZnS core–shell QDs with type-I core–shell structure and particle size of 5 nm were prepared via sol–gel method. Transmission electron microscope characterization demonstrates the core–shell structure and spherical morphology of the as-synthesized ZnO/ZnS QDs. The PL spectra show that ultraviolet fluorescence has been greatly enhanced. The maximum fluorescence intensity of ZnO/ZnS core–shell QDs increases by 5288.6% compared with that of bare ZnO QDs. The PL quantum yield increases from 9.53% to 30.95%. After being stored for three weeks, the fluorescence performance can be well retained. Furthermore, the cytotoxicity tests confirm the excellent biocompatibility of ZnO/ZnS core–shell QDs, demonstrating they are good candidates for cell imaging.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Yiyan Jiang,Hongkuo Si,Maolin Chen,Miao Su,Gangqiang Wang,Caiqin Gu,Shujun Zhao,Shuangfei Xiang,Xiangdong Liu,Feiya Fu
Direct fabrication of antimicrobial cellulose filaments by wet spinning remains challenging due to complex nanoparticle synthesis and dispersion issues. To address this, we developed a one-pot in situ synthesis strategy within a cellulose-dissolving alkaline system. In this approach, the hydroxyl and terminal aldehyde groups of cellulose chains facilitate the in-situ formation of antibacterial particles (Ag NPs, ZnO). By modulating the particles composition and coagulation bath, we have produced three structurally distinct antibacterial regenerated cellulose filaments. These are designated as regenerated cellulose filaments contain Ag NPs (ACF), regenerated cellulose filaments contain ZnO particle (ZCF) and regenerated cellulose filaments contain ZnO particle and Ag NPs (AZCF). ACF exhibited a smooth surface with limited silver nanoparticle visibility, ZCF displayed surface roughness due to ZnO particle aggregation, and AZCF maintained surface smoothness with dense, uniform nanoparticle distribution. This phenomenon is attributed to the interactions of Ag NPs and ZnO particles. Based on this interaction, the regenerated cellulose developed in this study exhibit both antimicrobial activity (> 95 % bactericidal rates against both E. coli and S. aureus ) and low cytotoxicity. Mechanistic investigations indicate that its antibacterial effects originated from the synergistic action of reactive oxygen species (ROS) production and regulated metal ion release.
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高影响因子
ACS Nano
·
2025
·
IF 16
Haixin Li,Yudong Wang,Xiongxin Luo,Dengzhou Jia,Wen Jiang,Jiandan Liang,Shounian Cheng,Xia Cao
Etiquette plays a fundamental role in daily life and socioeconomic development, necessitating its continual advancement toward professionalization and standardization. However, traditional etiquette training methods, which rely primarily on subjective manual instruction, suffer from low efficiency and lack standardized evaluation criteria. Addressing these limitations, this study presents a real-time etiquette training monitoring platform integrating self-powered piezoelectric sensors, signal acquisition and processing modules, and a LabVIEW-based monitoring program. The platform employs flexible ZnO nanowire-doped polyvinylidene fluoride (ZnO NWs/PVDF) fiber film fabricated via oriented electrospinning, achieving a high β-phase content of 94% and an ultrahigh piezoelectric coefficient (d33) of 369.4 pm/V. The corresponding piezoelectric nanogenerator (ZP-PENG) outputs an open-circuit voltage up to 39 V and demonstrates excellent human motion capture capabilities, accurately monitoring joint movements such as elbow, neck, and waist in a range of 0–70°. Integrated with a multinode sensor network and LabVIEW software, the system effectively provides real-time, quantitative evaluation and standardized feedback on key etiquette behaviors, including handshake strength and duration, standing, and sitting postures. This data-driven, technologically empowered approach advances etiquette training from experience-based methods to a precise, scientific paradigm, promoting modernization while harmonizing technological innovation with humanistic values.
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PubMed
高影响因子
APL Materials
·
2024
·Vol. 12
·期 1
·
IF 5.3
Luan Pengyan,Yang Zhenxin,Liang Zheng,Li Xiaoliang,Chen Nan,Li Fushun,Li Xuanhe,Su Jiale,Lu Zheng-Hong,Zhu Qiang
Zeolitic imidazolate framework-8 (ZIF-8) is a versatile candidate for next-generation electronics owing to its adjustable lattice and physicochemical properties. However, the utilization of ZIF-8 for the fabrication of solid-state electronics and circuit components, such as field-effect transistors (FETs), has not been realized thus far, primarily due to ongoing debates surrounding its electrical properties. In this work, we fabricated n-type FETs using ZIF-8@ZnO nanorod arrays. A significant hysteresis behavior was observed. It was demonstrated that this hysteresis cannot be assigned to the well-established ferroelectric effect but rather to the polarization of ZIF-8, wherein the electric field of the gate aligns the dipole of 2-methylimidazole through molecular orientation rotation. It was clarified that the process of annealing in air can result in the chemisorption of oxygen on methylimidazole, leading to a limitation in the rotation of methylimidazole. This restriction ultimately causes the depolarization of ZIF-8, resulting in the erasure of hysteresis. This study unfolds the tunable hysteresis behavior of ZIF-8 and its sensibility to oxygen, thereby highlighting the potential applications of ZIF-8 in FETs, nonvolatile memories, and gas sensors.
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CELLULOSE
·
2020
·Vol. 28
·期 2
·991-1009
·
IF 4.21
Zhang Yin,Zhao Guomin,Xuan Yan,Gan Lu,Pan Mingzhu
Abstract Phenol, considered as a stable and refractory organic pollutant, has posed an increasing threat to the environment and human health. Herein, the ZnO was regulated with nano-biochar (CCNC) derived from cellulose nanocrystals (CNCs). The CCNC/ZnO photocatalysts were fabricated via in situ precipitation and carbonization, in which CNCs served as both the templates and carbon source. Meanwhile, Zn 2+ ions deposited on the surface of rod-like CNCs by electrostatic interaction. Subsequently, homogeneous dispersed ZnO nanoparticles were anchored onto the surface of CNCs, decreasing the ZnO nanoparticles size. As the CNCs transformed into CCNC, the resultant CCNC/ZnO photocatalysts demonstrated excellent degradation efficiency to phenol, corresponding to 99.8% within 90 min. Additionally, the CCNC/ZnO photocatalysts also displayed a satisfactory stability for five cycles without significant performance being decreased. The calculating and experimental results demonstrated that the conjugated graphitic structures of CCNC effectively reduced the band gap of ZnO from 3.26 to 2.96 eV. Besides, the CCNC remarkably promoted photogenerated electron-hole pairs separation and transfer, thereby improving the photodegradation efficiency for phenol. Furthermore, the efficiency for phenol photodegradation was comprehensively influenced by a combination of the ratio of photocatalyst, initial phenol concentration and catalyst dose, and pH value. This study broadened the application of CNCs in the field of photocatalysis, which provided a new perspective for the preparation of highly efficient photocatalysts using CNCs derived nano-biochar as a template and charge-transport pathway. Graphic abstract
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RSC Advances
·
2012
·Vol. 2
·期 13
·5571-5579
·
IF 0
Longcheng Xu,Jianming Pan,Jiangdong Dai,Zhijing Cao,Hui Hang,Xiuxiu Li,Yongsheng Yan
This paper reports a molecularly imprinted polymers (MIPs) based fluorescence sensor which is synthesized by grafting MIP layers on the surface of ZnO nanorods embedded γ-Fe2O3 nanoparticles via activators regenerated by electron transfer atom transfer radical polymerization (ARGET ATRP). Methacrylic acid (MAA, functional monomer), 3-(trimethoxysilyl)propyl mathacrylate (MPS) modified γ-Fe2O3 (γ-Fe2O3/MPS, assistant magnetic monomer) and ethylene glycol dimethacrylate (EGDMA, cross-linking monomer) were co-polymerized in anisole at 313 K in the presence of sulfamethazine as a template molecule. Sulfamethazine was then solvent-extracted to obtain ZnO-grafted molecularly imprinted polymers (ZnO-MIPs). ZnO-MIPs were characterized by FE-SEM, TEM, FT-IR, TGA/DSC, VSM, fluorescence spectroscopy and Raman spectroscopy. It was observed that sulfamethazine can quench the luminescence of ZnO-MIPs in a concentration-dependent manner that can be described by a Stern–Volmer-type equation. ZnO-MIPs were used to determine sulfamethazine in a spiked pork sample with good recognition ability. This study therefore demonstrates the potential application in the recognition and separation of antibiotics based on molecularly imprinted polymers.
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Sensor Letters
·
2016
·Vol. 14
·期 11
·1067-1073
·
IF 0
Wu Wenwen,Wang Sui
In this work, we reported a luminol electrochemiluminescence (ECL) sensor using a composite material compounded by ZnO nanoparticles and reduced graphene oxide (ZnO/RGO) as electrode membrane and in situ generated hydrogen peroxide as coreactant. The composite material was characterized
by fourier transform infrared spectroscopy analysis (FTIR) and X-Ray powder diffraction (XRD). Then this ZnO/RGO modified electrode was used to determine tetracaine hydrochloride (TA· HCl). Results show that the inhibition of ECL intensity increased with logarithm of TA · HCl
concentration within a linear range from 10–4
μg/mL to 10–2
μg/mL and the detection limit (S/N) was 3.3 × 10–5
μg/mL. In addition, the recoveries of real samples were 85.0%–104.0% (urine),
95.0%–127.4% (serum) and 87.0%–104.6% (raw material drug) respectively, demonstrating an acceptable reproducibility of this method.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yue Liu,Huan Yao,Liang Wu,Zhi-Hui Xie,Chuan-Jian Zhong
Using nanomaterials to design and prepare photoanodes could enhance photoelectrochemical and photocathodic protection (PCP) performances. However, little is known about how the detailed nanostructure correlates with performance. Here, we report a morphologically tunable nano-ZnO semiconductor grown on a TiO 2 nanotube array (ZnO/TiO 2 ) for the PCP of nickel-coated magnesium alloy by manipulating the hydrothermal reaction temperature. While irregular ZnO nanosheet clusters were observed at relatively low and high temperatures, a smooth array of nanorods with a hexagonal cross-section structure was obtained at a moderate reaction temperature. Such nanostructure exhibited the optimum photoelectrochemical and PCP capacities, showing the highest photogenerated current density, which is 4.2 times higher than the single-component TiO 2 photoanode. The apparent enhancement in the performance of the ZnO/TiO 2 composite was related to the morphological regulation of the nano-ZnO and the formation of staggered gap heterojunction between ZnO and TiO 2 . This assessment is supported by the results from several characterizations, including a high-resolution transmission electron microscope , Mott-Schottky, and valence band X-ray photoelectron spectroscopy. These findings give a new insight into the relationship between the structure and photoelectrochemical performances of nano-ZnO, which has significant implications for designing and preparing high-efficiency photoanode in photocatalysis and corrosion protection .
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