Analytical Methods
·
2024
·Vol. 16
·期 26
·4373-4380
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IF 2.7
Xiaoran Shi,Hui Zhao,Han Zhang,Qunfang Li,Fangming Lou
A feasible and practicable “off–on” type of fluorescence strategy for highly selective screening of L-selenium-methylselenocysteine (L-SeMC) in selenium-enriched Cardamine violifolia was developed using g-C3N4-MnO2 nanocomposites as fluorescent probes. The g-C3N4 nanosheets can emit blue fluorescence at 320 nm excitation wavelength with a fluorescence quantum yield of 28%. When MnO2 was deposited onto g-C3N4 nanosheets, the fluorescence of the g-C3N4 nanosheets was quenched due to fluorescence resonance energy transfer (FRET). After the addition of L-SeMC, MnO2 was reduced to Mn2+, which eliminated FRET and fluorescence was restored. Based on this, a quantitative method for the determination of L-SeMC was established. The fluorescence intensity of g-C3N4-MnO2 nanocomposites showed a good linear relationship with the concentration of L-SeMC in the range of 0–45 μg mL−1, the limit of detection (LOD, 3σ/K) was 8.25 ng mL−1 and the correlation coefficient was 0.9904. Common selenium compounds such as SeO2, Na2SeO3, SeMet and SeCys caused weak fluorescence intensity, which means that the developed method is highly selective to detect L-SeMC in a series of selenium compounds. Meanwhile, the technique was evaluated by spiking L-SeMC standards in C. violifolia extraction solutions and with 9 C. violifolia extraction specimens, receiving excellent accordance with results from the commercially available atomic fluorescence spectroscopy method.
研究领域:
植物学
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分析化学
·
食品科学
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PubMed
高影响因子
Advanced Energy Materials
·
2016
·Vol. 6
·期 18
·1600755
·
IF 15.23
Kaiqiang Qin,Enzuo Liu,Jiajun Li,Jianli Kang,Chunsheng Shi,Chunnian He,Fang He,Naiqin Zhao
High energy density and power density within a limited volume of flexible solid-state supercapacitors are highly desirable for practical applications. Here, free-standing high-quality 3D nanoporous duct-like graphene (3D-DG) films are fabricated with high flexibility and robustness as the backbones to deposit flower-like MnO 2 nanosheets (3D-DG@MnO 2 ). The 3D-DG is the ideal support for the deposition of large amount of active materials because of its large surface area, appropriate pore structure, and negligible volume compared with other kinds of carbon backbones. Moreover, the 3D-DG preserve the distinctive 2D coherent electronic properties of graphene, in which charge carriers move rapidly with a small resistance through the high-quality and continuous chemical vapor deposition-grown graphene building blocks, which results in a high rate performance. Marvelously, ultrathin (≈50 μm) flexible solid-state asymmetric supercapacitors (ASCs) using 3D-DG@MnO 2 as the positive electrode and 3D hierarchical nanoporous graphene films as the negative electrode display ultrahigh volumetric energy density (28.2 mW h cm −3 ) and power density (55.7 W cm −3 ) at 2.0 V. Furthermore, as-prepared ASCs show high cycle stability clearly demonstrating their broad applications as power supplies in wearable electronic devices.
研究领域:
材料科学
·
能源存储与转换
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高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-12
·
IF 17.694
Lu Hongwei,Chen An,Zhang Xindan,Wei Zixiang,Cao Rong,Zhu Yi,Lu Jingxiong,Wang Zhongling,Tian Leilei
Magnetic resonance imaging (MRI) is a non-invasive imaging technology to diagnose health conditions, showing the weakness of low sensitivity. Herein, we synthesize a contrast agent, SPIO@SiO 2 @MnO 2 , which shows decreased T 1 and T 2 contrast intensity in normal physiological conditions. In the acid environment of tumor or inflamed tissue, the manganese dioxide (MnO 2 ) layer decomposes into magnetically active Mn 2+ (T 1 -weighted), and the T 1 and T 2 signals are sequentially recovered. In addition, both constrast quenching-activation degrees of T 1 and T 2 images can be accurately regulated by the silicon dioxide (SiO 2 ) intermediate layer between superparamagnetic iron oxide (SPIO) and MnO 2 . Through the “dual-contrast enhanced subtraction” imaging processing technique, the contrast sensitivity of this MRI contrast agent is enhanced to a 12.3-time difference between diseased and normal tissue. Consequently, SPIO@SiO 2 @MnO 2 is successfully applied to trace the tiny liver metastases of approximately 0.5 mm and monitor tissue inflammation.
研究领域:
医学影像
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癌症研究
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材料科学
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生物医学工程
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高影响因子
LUMINESCENCE
·
2025
·Vol. 40
·期 11
·e70357
·
IF 3
Li Li,Yulu Xia,Ming Zhang
Carbon nanoparticles (CNPs) integrated with nanomaterial-based quenchers have emerged as an innovative platform for developing advanced sensing systems. In this study, we developed a novel fluorescent sensing platform for the highly sensitive detection of hydroxylamine (HA). Through a one-step hydrothermal synthesis approach, nitrogen and sulfur co-doped carbon nanoparticles (N,S-CNPs) were successfully prepared using dimethylamine hydrochloride and dimethyl sulfoxide (DMSO) as precursors. The synthesized N,S-CNPs demonstrated exceptional fluorescence properties, achieving a remarkably high quantum yield of 50%, along with outstanding water solubility, photostability, and chemical stability. The fluorescence emission of N,S-CNPs could be effectively quenched by manganese dioxide (MnO 2 ) nanosheets through a combined mechanism of inner filter effect (IFE) and static quenching effect (SQE). Notably, HA induced the redox-mediated decomposition of MnO 2 nanosheets, converting MnO 2 to Mn 2+ ions and consequently restoring the fluorescence of N,S-CNPs (turn-on response). Under optimized conditions, the proposed sensor exhibited a wide linear detection range (0.1–200 μM) with an ultra-low detection limit of 0.04 μM. The sensor demonstrated excellent analytical performance in real-world applications, successfully detecting HA in lake and river water samples with high accuracy and reliability. These findings highlight the great potential of this fluorescent sensing platform for environmental monitoring and water quality assessment.
研究领域:
环境化学
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分析化学
·
纳米材料
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荧光传感
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水质评价
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高影响因子
Materials Horizons
·
2025
·
IF 10.7
Zhenghuan Yin,Yajun He,Peiyu Huang,Wenjie Ma,Jian Liang,Tianyi Wang,Yuhao Peng,Wei Xiao,Dong Gu
Formaldehyde (HCHO) is a major indoor air pollutant that poses serious risks to human health, making its efficient removal a critical environmental concern. Catalytic oxidation at room and sub-ambient temperatures has attracted significant attention due to its potential to completely decompose HCHO into harmless CO2 and H2O. However, practical implementation remains challenging because of low reaction activation energy and limited catalyst performance at reduced temperatures. In this study, Au-loaded manganese oxide nanowire catalysts (x% Au/MnO2-NWs) were synthesized using a colloidal deposition strategy to achieve efficient HCHO removal under ambient and sub-ambient conditions. The optimized 1% Au/MnO2-NWs catalyst achieved complete conversion of 280 ppm HCHO at 30 °C and, remarkably, fully oxidized 20 ppm HCHO even at 0 °C, demonstrating outstanding low-temperature activity and practical potential. Comprehensive characterization studies including H2-TPR, EPR, Raman spectroscopy, and in situ DRIFTS revealed that Au nanoparticles induced abundant oxygen vacancies, which acted as active sites for HCHO adsorption and promoted O2 activation. The synergistic interaction between Au and MnO2 significantly enhanced low-temperature catalytic performance, providing mechanistic insights and a solid foundation for the rational design of highly efficient catalysts for indoor formaldehyde removal.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2015
·
IF 4.097
Yi He,Wei Huang,Yun Liang,Haili Yu
A novel, label-free, and low-cost colorimetric assay is developed for the detection of hydrazine with high-selectivity and excellent sensitivity using MnO 2 nanosheets as probes. It is first time demonstrated that MnO 2 nanosheets can be used as colorimetric probes for environmental analysis. In the absence of hydrazine, MnO 2 nanosheets exhibit a strong ultraviolet–visible (UV–vis) absorption peak at 370 nm due to the d-d transition. Once hydrazine is introduced, MnO 2 nanosheets will be reduced to Mn(OH) 2 nanoparticles, and the absorbance at 370 nm decreases remarkably. In this case, a distinct color change from yellow to colorless can be observed, which is dependent on the concentration of hydrazine. The signal change can allow colorimetric detection of hydrazine. The assay offers a good linear range from 0.5 μM to 20 μM and a detection limit of 0.4 μM for hydrazine. The lowest detection concentration by the naked eye is as low as 11 μM. Additionally, the developed assay was successfully applied for the colorimetric detection of hydrazine in environmental water samples.
研究领域:
分析化学
·
环境科学
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 5
·3613-3628
·
IF 4.682
Guo Zijiao,Li Yue,Lu Zan,Chao Yunfeng,Liu Wei
Abstract As interest in smart textiles grows, fiber-based supercapacitors are gaining attention as promising devices for powering wearable electronics. Herein, we have demonstrated a two-step manufactured hybrid fiber with excellent energy storage properties. Anhydrous MXene (Ti 3 C 2 T x ) sheets are primarily spun in synergy with liquid crystal carbon nanotubes (CNTs) to produce a continuous fiber as a promising electrode material, which solves the problem of poor rate capability owing to the sheet re-stacking of MXene. MnO 2 @MXene/CNT fibers are subsequently prepared by electrochemical deposition with controlled time. The optimal content of MXene (10 wt%) and a perfect thickness of the MnO 2 layer (4 μm) are testified to achieve an excellent capacitance of 371.1 F cm −3 in three-electrode system, which is about 200% and 1800% higher than that of 10 wt%-MXene/CNT and CNT fiber electrode, respectively. Symmetric fiber supercapacitor is assembled by paralleling two fibers with LiCl/PVA gel electrolyte, manifesting a superior cycling stability of 86.3% after 10000 cycles. Graphical Abstract Anhydrous MXene nanosheets and CNTs are incorporated by a high yield spinning technique to prepare continuous hybrid fibers as a conductive framework for MnO2 deposition, exhibiting stable and outstanding energy storage properties in supercapacitor.
研究领域:
材料科学
·
能源技术
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高影响因子
ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Hanyue Xue,Min Yu,Kunyi He,Yingnan Liu,Yuanyuan Cao,Yuhang Shui,Jing Li,Muhammad Farooq,Li Wang
Herein, a novel bimodal ratiometric probe for sensitive and selective detection of biothiols (including glutathione (GSH), cysteine (Cys) and homocysteine (Hcys)) was constructed, which was based on the redox reaction between manganese dioxide nanoflakes (MnO 2 NFs) and rhodamine (RhB) and biothiols. When MnO 2 NFs was added into RhB solution, RhB was oxidized to a series of derivatives, accompanying with the colorimetric color changing from purple to light pink and fluorescence changing from red to green. In the presence of GSH, Cys or Hcys, they could reduce MnO 2 NFs to Mn 2+ , thereby preventing the following oxidization of RhB and the corresponding color and fluorescence changes. The absorption intensity ratio and fluorescence intensity ratio showed good linear relationships with the concentrations of biothiols. The colorimetric detection limits for GSH, Cys and Hcys were 0.057 μM, 0.140 μM and 0.087 μM, respectively. And the fluorescence detection limits were 0.177 μM, 0.282 μM and 0.161 μM. More importantly, this probe was successfully applied to monitor the concentration of GSH/Cys/Hcys in human serum samples, with satisfactory recovery. Thus, this MnO 2 NFs-RhB platform can potentially be a candidate for the detection of biothiols.
研究领域:
分析化学
·
生物化学
·
纳米技术
·
医学诊断
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PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Yuan He,Liangjie Wang,Zhan Chen,Bo Shen,Jinshan Wei,Ping Zeng,Xianghua Wen
Manganese dioxide has been widely recognized as catalyst in catalytic ozonation for organic pollutants removal from wastewater in recent decades. However, few studies focus on the structure-activity relationship of MnO 2 and catalytic ozonation mechanism in water. In the present study, the oxidative reactivity of three different crystal phases of MnO 2 corresponding to α-MnO 2 , β-MnO 2 and γ-MnO 2 towards metoprolol (MET) and ibuprofen (IBU) were evaluated. α-MnO 2 was found to contain the most abundant oxygen vacancy and readily reducible surface adsorbed oxygen (O 2− , O − , OH − ), which facilitated an increase of ozone utilization and the highest catalytic performance with 99% degradation efficiency for IBU and MET. α-MnO 2 was then selected to investigate the optimum key operating parameters with a result of catalyst dosage 0.1 g/L, ozone dosage 1 mg/min and an initial pH 7. The introduction of α-MnO 2 promoted reactive oxygen species (O 2− , O − , OH − ) generation which played significant roles in IBU degradation. Probable degradation pathways of MET and IBU were proposed according to the organic intermediates identified and the reaction sites based on density function theory (DFT) calculations. The present study deepened our understanding on the MnO 2 catalyzed ozonation and provided reference to enhance the process efficiency.
研究领域:
环境科学
·
化学工程
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PubMed
高影响因子
ACS Applied Polymer Materials
·
2026
·
IF 5.2
Juntong Meng,Yongshuo Zhang,Xiongfei Du,Wei Zhang,Tiantian Li,Xinya Wang,Mingxing Chen
Formaldehyde (HCHO), a hazardous volatile organic compound (VOC) in indoor environments, urgently requires efficient abatement strategies. MnO2 is renowned for its excellent catalytic activity and enables effective degradation of HCHO at low temperatures. In this study, MnO2 nanorods (NRs) were successfully grown on polypropylene (PP) nonwoven fabric via hydrothermal synthesis, yielding MnO2 NRs @ PP composite material with integrated HCHO removal, antibacterial, and photocatalytic functions. pH value and temperature critically regulated MnO2 morphology. Increasing pH raised the aspect ratio of MnO2 NRs, which transitioned to MnO2 nanoparticles (NPs) when the pH value was above pH 3.5. Higher temperatures promoted MnO2 NRs formation, yet beyond 150 °C, excessive refinement led to MnO2 NRs agglomeration and partial PP fiber melting. Optimal performance was achieved at pH 3.5 and 150 °C, where the composite exhibited a high HCHO removal efficiency of 55.1% along with notable antibacterial and photocatalytic properties. This work provides a feasible synthesis strategy for multifunctional composites that can be applied in indoor air purification and environmental remediation.
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ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Xinyi Guo,Mengmeng Wang,Danyang Qu,Hao Cui,Jiajing Gong,Qinglin Shen,Yang Han,Xingqi Pan,Zhenbao Liu,Meilin Shi
Sonodynamic therapy (SDT) offers a noninvasive strategy for tumor ablation through ultrasound-activated sonosensitizers that generate reactive oxygen species (ROS); however, its therapeutic efficacy is often limited by tumor hypoxia. Herein, we report the rational design of a multifunctional theranostic nanoplatform, HA-MnO2-TCPP nanoflowers, that integrates active tumor targeting, dual ROS amplification, and magnetic resonance imaging (MRI) guidance for synergistic sonodynamic and chemodynamic therapy. The MnO2 nanoflowers were loaded with the sonosensitizer 4-carboxyphenyl porphyrin (TCPP) and surface-modified with hyaluronic acid (HA). This design enables CD44 receptor-mediated tumor targeting and tumor microenvironment-responsive degradation. Upon exposure to the mildly acidic and reductive tumor microenvironment, MnO2 is reduced to Mn2+, leading to glutathione depletion, in situ oxygen generation, and alleviation of hypoxia, while the released Mn2+ catalyzes Fenton-like reactions to generate highly toxic hydroxyl radicals (•OH) and simultaneously serves as an efficient T1-weighted MRI contrast agent. Meanwhile, TCPP enhances singlet oxygen (1O2) generation upon ultrasound activation, enabling effective sonodynamic therapy. Through the coordinated activation of SDT and CDT under MRI guidance, HA-MnO2-TCPP nanoparticles achieve precise and efficient tumor suppression without reliance on photothermal mechanisms. This work provides a robust paradigm for tumor microenvironment-responsive nanotheranostics and highlights the potential of ultrasound-activated strategies for precision cancer therapy.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2026
·
IF 3.8
Wang Li,Li Lei,Chen Wei,Zhang Mingcui
Acute myocardial infarction (AMI) poses a severe threat to human health, making its rapid and sensitive diagnosis crucial. Cardiac troponin I (cTnI) has been established as the gold standard biomarker for AMI diagnosis. Herein, a dual-mode immunosensor was constructed by integrating manganese dioxide (MnO 2 ) nanozyme and fluorescence carbon dot (B-CDs) in silica (SiO 2 ), termed B-CDs@SiO 2 @MnO 2 , for the colorimetric and fluorescent detection of cTnI. The sensing signal mainly included two parts: B-CDs@SiO 2 @MnO 2 -based catalytic color reaction and B-CDs@SiO 2 fluorescence recovery after etching MnO 2 . The MnO 2 nanozyme catalyzes the oxidation of TMB to generate blue-colored TMBox, which turns yellow upon acid addition, enabling colorimetric detection. Concurrently, the MnO 2 nanosheets quench the fluorescence of B-CDs@SiO 2 . In the presence of ascorbic acid (AA), MnO 2 is reduced to Mn 2+ , leading to fluorescence recovery and thus enabling fluorescent detection. Profiting from the superior self-correction features of B-CDs@SiO 2 @MnO 2 dual-mode sensor, this method exhibits good linearity and sensitivity toward cTnI among 0.05–50 ng/mL, with detection limits of 0.0074 ng/mL for the colorimetric mode and 0.0063 ng/mL for the fluorescent mode. In addition, the human serum samples’ recoveries show good agreement between the colorimetric mode (90.0–117.8%) and the fluorescent mode (90.2–115.8%). Furthermore, we employ this platform to monitor cTnI levels in both cellular and blood samples from AMI patients, indicating the promising clinical application potential of this platform.
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高影响因子
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