ANALYTICAL CHEMISTRY
·
2021
·
IF 6.986
Yan Li,Libing Zhang,Zhen Zhang,Yu Liu,Jing Chen,Jia Liu,Peiyao Du,Huixia Guo,Xiaoquan Lu
Manganese dioxide nanosheets combined with cysteine-assisted emitting manganese dioxide nanospheres (Cys-MnO2 nanospheres) is fabricated for the first time as an “off–on” fluorescence detection platform for glutathione (GSH). In this sensing system, Cys-MnO2 nanospheres served as energy donors, while MnO2 nanosheets were used as both energy acceptors and recognition units. MnO2 nanosheets can effectively quench the fluorescence of Cys-MnO2 nanospheres through the fluorescence resonance energy transfer (FRET). The addition of GSH could reduce MnO2 nanosheets into Mn2+, disrupting the FRET process and restoring the fluorescence of Cys-MnO2 nanospheres. Under the optimum conditions, the “switch-on” platform we established has a wide response to GSH with a range of 5–50 μM and 150–800 μM, as well as a superior specificity. Importantly, all components of the sensor are nontoxic, biocompatible, easily prepared, and have a high utilization of raw materials. Moreover, the sensing system achieved satisfactory results in human serum, showing a tremendous potential in the field of biomedicine.
研究领域:
生物化学
·
分析化学
·
医学诊断
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Tao Zhang,Bo Li,Chaofeng Wang,Shuilin Wu,Shengli Zhu,Hui Jiang,Yufeng Zheng,Zhaoyang Li,Zhenduo Cui,Yu Zhang,Paul K Chu,Xiangmei Liu
Photocatalysis has been a research hotspot in recent years, and the design and modification of photocatalysts have been the key points. Common methods for designing photocatalysts, including constructing heterojunctions and homojunctions, have been developed on the basis of heterojunctions. In this study, two homojunctions of manganese dioxide (MnO 2 ), including a high-index crystal plane homojunction and a general homojunction, are prepared using a stepwise hydrothermal method. Using a capping agent, the high-index crystal surface of the MnO 2 is exposed. It is found that the electron transport efficiency between the two components of the homojunction with high-index planes is higher and the adsorption capacity of the oxygen is stronger, which leads to higher photocatalytic efficiency. In addition, the newly designed high-index homojunction is used for the treatment of bacterial infections, and it kills Staphylococcus aureus ( S. aureus ) and Escherichia coli ( E. coli ) at rates of 99.95% ± 0.04% and 99.31% ± 0.25%, respectively. It also has excellent therapeutic effects on mouse wounds, which implies superb practical application value. This work provides a new strategy for the improved design of homojunctions and the application of photocatalytic materials.
研究领域:
材料科学
·
生物学
·
医学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2018
·Vol. 165
·期 11
·A2815
·
IF 3.662
Huijie Zhang,Lili Wu
Manganese dioxide has been considered to be one of the most attractive electrode materials for electrochemical energy storage applications owing to its high theoretical specific capacitance, low cost, abundant natural reserves and eco-friendliness. However, MnO2 has poor conductivity, which limits rate capability, and thus hinders the application of MnO2 in energy storage. Here we attempt to take advantage of cobalt-based metal organic frameworks derived nanoporous carbon (MOF-NPC) to improve the electrochemical performance of MnO2-based composite electrodes. We fabricated Na+-MnO2/MOF-NPC hybrid electrode by a simple redox reaction method. Accordingly, the hybrid electrode reaches a specific capacitance of 217.0 F g−1, which is significantly better than that of the individual components. Then the contribution of capacitance and diffusion to the whole is analyzed quantitatively. The capacitance retains 82.80% when the current density increases from 2 A g−1 to 20 A g−1. After 5000 cycles, the total capacitance loss is only 9%. Moreover, an asymmetric supercapacitor is assembled using Na+-MnO2/NPC composite and activated carbon as positive and negative electrodes, respectively. The asymmetric supercapacitor has the capacitance retention of 82% after 3000 cycles. These results provide a promising direction for designing high-performance supercapacitors.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Xinyi Li,Wanqing Liang,Yawen Gao,Yongqin Shi,Cheng Zhang,Kui Zhang
Glutathione (GSH) has important physiological functions and has been implicated in several diseases. It is therefore of great physiological importance and clinical value to develop simple and efficient methods for measuring GSH levels. However, common used luminescent materials with short lifetimes inevitably generated background signal from the biological samples during light excitation. In this work, a GSH sensing method with ultralow background interference was developed using phosphorescent carbon dots (CDs). Introducing heteroatom and carbonyl group effectively activated the triplet state of phosphorescent CDs. Meanwhile, immobilization of CDs in SiO 2 (CDs@SiO 2 ) realized long-lived phosphorescent emission (lifetime of 1.54 s) in aqueous dispersion. Manganese dioxide (MnO 2 ) quenched the phosphorescence of CDs@SiO 2 via inner filter effect and triplet energy transfer, yet the phosphorescence was restored when GSH was present. The phosphorescence was recorded when the excitation source was turned off, which successfully eliminated the background fluorescence of biological samples. The work presented here will promote the fabrication of bioprobes with low background.
研究领域:
分析化学
·
生物医学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Jianghua Wu,Yue Guo,Waseem Raza,Hajera Gul,Geng Luo,Yangbin Ding,Ying Li,Ying Lv,Jian Yu,Lasharl Najeeb Ur Rehman,Jie Zhao
Manganese dioxide (MnO 2 ) is a promising supercapacitive material due to the advantages of low cost, natural abundance and friendly environment. Nevertheless, it generally presents an unsatisfactory supercapacitive performance due to the poor utilization rate in the charge/discharge process and the sluggish charge (electrons/ions) transfer kinetics. Constructing a 3D MnO 2 network is a promising way to solve the above problems, but usually suffers from a prolonged reaction time or a high-heating source that makes them unfavorable for practical applications. Here, we developed a one-pot, fast and cost-effective method to assemble 3D MnO 2 network electrode materials within 10 min. The MnO 2 -network materials present a high utilization rate and a fast charge transfer capability. As an aqueous supercapacitor electrode, it exhibited a high specific capacitance of 382 F g −1 at 1 A g −1 and ranked among the intrinsic MnO 2 materials at the top level. The corresponding asymmetric supercapacitor coupled with activated carbon delivered a high energy density of 44 Wh kg −1 at a power density of 277 W kg −1 and maintains 91.2 % capacitance retention after 10,000 cycles at 10 A g −1 . This work paves the way for simple, environmental-friendly, and rapid methods to gain the high-performance MnO 2 electrode materials for supercapacitors.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Ling Chen,Hao Yuan,Shuqin Chen,Chan Zheng,Xiukai Wu,Ziqiao Li,Chunyan Liang,Pinqiang Dai,Qianting Wang,Xing Ma,Xiaohui Yan
Micro/nano-motors (MNMs) that combine attributes of miniaturization and self-propelled swimming mobility have been explored for efficient environmental remediation in the past decades. However, their progresses in practical applications are now subject to several critical issues including a complicated fabrication process, low production yield, and high material cost. Herein, we propose a biotemplated catalytic tubular micromotor consisting of a kapok fiber (KF, abundant in nature) matrix and manganese dioxide nanoparticles (MnO2 NPs) deposited on the outer and inner walls of the KF and demonstrate its applications for rapid removal of methylene blue (MB) in real-world wastewater. The fabrication is straightforward via dipping the KF into a potassium permanganate (KMnO4) solution, featured with high yield and low cost. The distribution and amount of MnO2 can be easily controlled by varying the dipping time. The obtained motors are actuated and propelled by oxygen (O2) bubbles generated from MnO2-triggered catalytic decomposition of hydrogen peroxide (H2O2), with the highest speed at 615 μm/s (i.e., 6 body length per second). To enhance decontamination efficacy and also enable magnetic navigation/recycling, magnetite nanoparticles (Fe3O4 NPs) are adsorbed onto such motors via an electrostatic effect. Both the Fe3O4-induced Fenton reaction and hydroxyl radicals from MnO2-catalyzed H2O2 decomposition can account for the MB removal (or degradation). Results of this study, taken together, provide a cost-effective approach to achieve high-yield production of the MNMs, suggesting an automatous microcleaner able to perform practical wastewater treatment.
研究领域:
环境科学
·
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Zhang Wen,Xu Yucheng,Lin Jian
MnO 2 has been proven to be highly reactive to HCHO, but the form of powder limits its application. The problems of easy agglomeration and difficult recovery of MnO 2 powder can be solved by loading it onto fibrous materials, and improved its catalytic efficiency. However, the loading amount and stability are the challenges encountered in application. In this study, MnO 2 nanosheets were in-situ grown on lignin fiber (LFs) pads by a simple impregnation method, and the morphology and chemical structure of the synthesized MnO 2 -LFs composites were characterized. The results show that the fibers prepared by centrifugal spinning have a smaller diameter than traditional fibers, allowing for more MnO 2 loading. Due to the presence of abundant functional groups on the LFs surface, strong Mn–O and hydrogen bond interactions promote robust MnO 2 anchoring, achieving uniform distribution of MnO 2 on the LFs surface. Subsequently, δ-MnO 2 formed on the LFs surface after 72 h of impregnation in KMnO 4 solution exhibited the best HCHO degradation performance. After 2 h of reaction, the HCHO removal rate was as high as 80.14%, and it had good stability and reusability. Therefore, LFs are expected to be used as carrier materials for MnO 2 in the purification of indoor air HCHO.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Qing Tian,Haoyu Wang,Shuaiqi Huangfu,Rong Yang,Yao Chen,Jie Gao,Yingchun Yang,Lianbing Zhang
Although manganese dioxide (MnO2) has been explored as a powerful laccase nanozyme for pollutant oxidation in wastewater treatment, the phase-activity relationship of multiphase MnO2 remains ambiguous and controversial. Herein, the experimental studies show that the laccase-like activities and aerobic catalytic oxidation toward tetracycline antibiotics of the six types of MnO2 are in the following order: β- > λ- > γ- > α- > ε- > δ-MnO2. Density functional theory (DFT) calculations revealed that the catalytic activities are inversely proportional to the oxygen vacancy formation energies of the different MnO2 materials. Further investigation of surface oxygen species with reactivity demonstrated that rich oxygen vacancies boost the oxygen mobility and catalytic efficiency of MnO2 nanozymes, which is in good agreement with both experimental and DFT results. Hence, this study reveals the decisive role of the crystal phase in the oxygen vacancy generation, which elucidates the laccase-like catalytic mechanism of MnO2 nanozymes and is valuable for the future design and synthesis of MnO2 nanocatalysts.
研究领域:
环境科学
·
材料科学
·
生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 11
·11541-11547
·
IF 1.798
Liu Hongdong,Hu Zhongli,Ruan Haibo,Hu Rong,Su Yongyao,Zhang Lei,Zhang Jin
Owing to the high reversible capacity, low-cost, natural abundance and environmental friendliness, manganese dioxide (MnO 2 ) is recognized as one of the most appropriate and promising anode materials. In this work, nanostructured MnO 2 anode materials have been achieved via a hydrothermal method. The crystal structure, morphology and specific surface area of as-prepared MnO 2 are characterized by XRD, SEM and BET techniques. As anode materials for lithium-ion batteries, MnO 2 samples show high initial discharge capacity and relatively excellent cyclic performance. The electrochemical performance of MnO 2 samples is related to crystal structure and surface morphology. Monoclinic structure, it is similar to graphene, which is more convenient for the fast ionic transportation into the bulk of the electrode materials. And porous structure, which can accommodate volume expansion, shorten the electron and lithium ion diffusion pathway and provide a large number of electrochemical reactive sites for lithium ion insertion and extraction during cycling.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Jiawei Zhai,Bin Luo,Tianyang Liu,Hongtu Dong,Xiaotong Jin,Xiaodong Wang,Chunjiang Zhao
The rapid development of modern agricultural biotechnology and information technology has become a key driver of modern agricultural growth. The demand for ion detection is prevalent in all aspects of agriculture. This study details the research on an ion sensor agricultural system using potassium (K) ion-selective electrodes (ISEs). The main emphasis is on the application of artificial neural networks (ANNs) for driving ISE development of accuracy. ISEs based on solid contact with metal oxides, specifically manganese dioxide, are studied. Moreover, the design details of an ion signal acquisition device using the NI-9205 acquisition card and LabVIEW are presented. Finally, based on experimental results of nutrient solution samples, ANNs show better performance than the multiple linear regression method. The mean relative error of K-ISE detection was maintained within 4%. This study thoroughly discusses ISE technology to promote its adoption in agriculture.
研究领域:
农业生物技术
·
信息科学
✓ 已验证
产品关联
DOI
高影响因子
Science of Advanced Materials
·
2022
·Vol. 14
·期 5
·927-933
·
IF 1.067
Zhou Shuwen,Wang Qing,Chen Jun,Shen Yue,Liu Li,Wang Cheng
Manganese dioxide (MnO2) is one of the commonly applied inorganic material which is gaining increasing attentions in recent years. However, preparation and optimization of MnO2 nanoparticles have rarely been studied by previous studies, making the mechanisms responsible
for preparation of MnO2 remaining largely unknown. Here in this study, we synthesized MnO2 through reduction of potassium permanganate (KMnO4) using different reductants, including protein, polymers and small molecule organic acids. It was suggested that, stable
MnO2 nanoparticles can only be obtained in balanced synthesis/stabilization process which requires the reductant to have proper reducibility and stabilization ability at the right charge ratios. Our results concluded that, among these materials, polyvinylpyrrolidone (PVP) K30 showed
the best performance at the charge ratio of 8/3 (w/w, PVP K30 to KMnO4, under given reaction conditions, which resulted in nanoparticles (hydrodynamic size: 79.72±31.53) with high stability and well dispersity, which was then selected as the optimal formulation.
研究领域:
材料科学
·
化学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2017
·
IF 3.012
Aijuan Xie,Feng Tao,Chao Jiang,Wenliang Sun,Yanfang Li,Lina Hu,Xiang Du,Shiping Luo,Chao Yao
The different crystallographic structures of manganese dioxide (α-MnO 2 , β-MnO 2 , γ-MnO 2 and δ-MnO 2 ) were prepared via simple and feasible methods. Among four crystallographic structures, γ-MnO 2 exhibited the best electrochemical property and was chosen to compound γ-MnO 2 /polyaniline (PANI) composite electrode through in situ synthesis techniques. The as-prepared samples were characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD). The electrochemical properties of as-prepared samples influenced by the different mass ratios, scan rates, and current densities were mainly investigated by cyclic voltammetry (CV), galvanostatic charge-discharge, electrochemical impedance spectroscopy (EIS), and cycle life, respectively. The results showed that the specific capacitance can be up to 493 F g − 1 as mass ratio of γ-MnO 2 /PANI was 1:5 at current density of 0.5 A g − 1 , suggesting the γ-MnO 2 /PANI (1:5) composite as an electrode material for super capacitors has great development prospects.
研究领域:
材料科学
·
电化学
✓ 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）