Nanomaterials
·
2023
·Vol. 13
·期 17
·2408
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IF 5.3
Shijie Wang,Dongxue Song,Lijun Liao,Bo Wang,Zhenzi Li,Mingxia Li,Wei Zhou
Doping engineering of metallic elements is of significant importance in photocatalysis, especially in the transition element range where metals possess empty ‘d’ orbitals that readily absorb electrons and increase carrier concentration. The doping of Mn ions produces dipole interactions that change the local structure of BiOCl, thus increasing the specific surface area of BiOCl and the number of mesoporous distributions, and providing a broader platform and richer surface active sites for catalytic reactions. The combination of Mn doping and metal Bi reduces the forbidden bandwidth of BiOCl, thereby increasing the absorption in the light region and strengthening the photocatalytic ability of BiOCl. The degradation of norfloxacin by Bi/Mn-doped BiOCl can reach 86.5% within 10 min. The synergistic effect of Mn doping and Bi metal can change the internal energy level and increase light absorption simultaneously. The photocatalytic system created by such a dual-technology combination has promising applications in environmental remediation.Keywords:photocatalysis;BiOCl;manganese doping;self-assembly
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
PubMed
高影响因子
MATERIALS SCIENCE FORUM
·
2015
·
IF 0
Wei Cai,Chun Lin Fu,Rong Li Gao,Wei Hai Jiang,Xiao Ling Deng,Gang Chen
Bismuth ferrite is an important material in ferroelectric photovoltaic field, because of its narrow band gap and large polarization. Doping is a common method to further improve the photovoltaic properties of bismuth ferrite. Mn-doped bismuth ferrite thin films were prepared by sol-gel method. The effects of manganese on the crystal structure, ferroelectric and photovoltaic properties have been investigated. The result indicates that Mn-doped bismuth ferrite thin films are single phase and the lattice constant increases with the increase of manganese content. As manganese content increases, the remnant polarization and coercive electric field increase, while the short circuit photocurrent density and power conversion efficiency decrease. The open circuit photovoltage increases first and reaches the maximum and then decreases as manganese content increases. The results indicate that enhanced ferroelectricity caused by addition of manganese doesn’t make improvement on the photovoltaic characteristic.
研究领域:
材料科学
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物理学
✓ 已验证
DOI
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Pengtao Sheng,Youyang Xie,Shuyu Han,Yanling Li,Weili Li
Manganese ion-doped quantum dots (QDs) with wide band gaps have been widely investigated to modify their electronic, magnetic, and photophysical properties. The research on Mn-doped Cu-In-Se QDs with narrow band gaps has been minimal due to the profound differences in the reaction reactivity of cations. In this work, photoluminescent and magnetic Cu-In-Se QD nanoprobes were designed and synthesized by introducing Zn 2+ ions, which function as an intermediate acid that can regulate metal ion acidity to enhance the doping efficiency of Mn 2+ ions in a facile phosphine-free hot-injection protocol. The emission peaks of Zn-doped Cu-In-Se QDs and MnZn-doped Cu-In-Se QDs exhibit significant composition-dependent shifts. Moreover, incorporating manganese ions confers a paramagnetic character to MnZn-doped Cu-In-Se QDs and provides a quasi-core shell structure with an Mn-rich alloy shell layer, as demonstrated by the micro-structural surface analysis and electron paramagnetic resonance spectroscopy . Analyzing the decay lifetime and quantum yield reveals that this host-dopant coupling involves a preferential energy transfer from the host material to the dopant (Mn 2+ ions), wherein photogenerated electrons nonradiatively transfer to the 4 T 1 level of Mn dopant and then recombine with the Cu x state above the valance band of host QDs. The ability to serve as nanoprobes for the visualization of tumors through fluorescence and magnetic resonance dual-modality imaging makes these ternary MnZn-doped Cu-In-Se QDs strong candidates for practical applications in biology/biomedicine field.
研究领域:
材料科学
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生物医学工程
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光学
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2021
·
IF 7.963
Zhipeng Dai,Lu Zhao,Shuchuan Peng,Zhengbo Yue,Xinyuan Zhan,Jin Wang
The regulation of surface electrons by non-metal doping of biochar (BC) is environmentally and ecologically significant. However, systematic studies on the regulation of surface electrons by transition metal doping are lacking. The present study is based on the observation that the removal efficiency of oxytetracycline (OTC) by Mn-doped BC is eight times higher than that of undoped BC in 20 min. The effects of Mn doping on the crystal phase formation, persistent free radicals (PFRs), electron density, molecular orbitals, and nucleophilic active sites of BC are investigated, and the intermediate products of OTC are evaluated. Mn doping enhances the signal for sp 2 -hybridised carbon–carbon double bond, forms more delocalised π-bonds, and promotes the formation of free radicals centred on the carbon atoms. The specific surface area of BC increases, and manganese oxide is formed on the its surface. Density functional theory calculations show that Mn doping accelerates the electron transfer of BC, provides additional electrons for the BC system, and makes this system more ionised. OTC molecules preferentially attack the nucleophilic reaction sites near Mn atoms based on molecular electrostatic potential measurements. Therefore, this study provides new insights into the surface electronic structures regulated by transition metal elements.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
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2010
·Vol. 16
·期 43
·12988-12994
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IF 5.382
He-Fang Wang,Yan Li,Ye-Yu Wu,Yu He,Xiu-Ping Yan
Graphical Vitamin see : The chelating ability of ascorbic acid (AA) enables the extraction of Mn and Zn from the surface of tripolyphosphate-capped Mn-doped ZnS quantum dots (QDs) generating more holes that are subsequently trapped by Mn 2+ . The reducing property of AA results in the reduction of Mn 3+ to Mn 2+ in an excited state, thus enhancing the excitation and orange emission of the QDs (see scheme). Such AA-induced phosphorescence enhancement enables selective detection of AA with a detection limit of 9 n M . Although quantum dot (QD)-based room temperature phosphorescence (RTP) probes are promising for practical applications in complex matrixes such as environmental, food and biological samples, current QD-based-RTP probes are not only quite limited but also exclusively based on the RTP quenching mechanism. Here we report an ascorbic acid (AA) induced phosphorescence enhancement of sodium tripolyphosphate-capped Mn-doped ZnS QDs, and its application for turn-on RTP detection. The chelating ability allows AA to extract the Mn and Zn from the surface of the QDs and to generate more holes which are subsequently trapped by Mn 2+ , while the reducing property permits AA to reduce Mn 3+ to Mn 2+ in the excited state, thereby enhancing the excitation and orange emission of the QDs. The enhanced RTP intensity of the QDs increases linearly with the concentration of AA in the range of 0.05–0.8 μ M . Thus, a QD-based RTP probe for AA is developed. The proposed QD-based turn-on RTP probe avoids tedious sample pretreatment, and offers good sensitivity and selectivity for AA in the presence of the main relevant metal ions and other molecules in biological fluids. The limit of detection (3 s ) of the developed method is 9 n M AA, and the relative standard deviation is 4.8 % for 11 replicate detections of 0.1 μ M AA. The developed method is successfully applied to the analysis of real samples of human urine and plasma for AA with quantitative recoveries from 96 to 105 %.
研究领域:
分析化学
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生物医学工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS TODAY
·
2019
·
IF 4.888
Peiman Xu,Lijun Qiu,Licheng Wei,Yiyi Liu,Dingsheng Yuan,Yi Wang,Panagiotis Tsiakaras
The efficient design of highly active, economical and stable electrocatalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline electrolyte still remains a great challenge. Herein, Mn doped Ni 2 P microflowers with porous feature directly grown on Ni foam have been successfully synthesized via a facile hydrothermal method and phosphorization treatment. By detailed analyzing X-ray photoelectron spectroscopy results, it can be found that the electronic structure of Ni 2 P can be efficiently regulated by Mn doping. As expected, the Mn-doped Ni 2 P microflowers with an optimal Mn/Ni ratio of 0.053 exhibit a low overpotential of 205 mV for HER and 330 mV for OER to achieve a current density of 100 mA cm −2 in 1.0 M KOH solution. Furthermore, when this electrocatalyst is adopted as both the cathode and anode for overall water splitting, a current density of 10 mA cm -2 is achieved at a cell voltage as low as 1.58 V, accompanied with high stability.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 63
·58113-58117
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IF 3.289
Guangguang Huang,Chunlei Wang,Xiaojing Xu,Yiping Cui
We reported an optical ratiometric temperature sensor via dopant-dependent dual emissions in Ag&Mn:ZnInS QDs. For QDs, the Ag-related emission is around 485 nm arising from the radiative recombination of the captured electrons' anion vacancies with holes trapped at the Ag dopant level. The energy level of anion vacancies is just below the conduction band, which can attain thermal equilibrium easily without further energy level adjusting. Moreover, Mn-related emission is around 585 nm via the Mn2+ ligand-field transition from 4T1 to 6A1. Mn-related thermal equilibrium is effectively suppressed due to the large energy gap between the conduction band and 4T1 energy level. These features not only obtain the opportunity to use the photoluminescence temperature specificity of Ag and Mn for ratiometric temperature sensing, but also make the flash synthetic approach via a pot non-injection possible. This temperature sensor, designed with Ag&Mn:ZnInS QDs, exhibits good temperature sensitivity (∼0.227% °C−1) and high QY (20%).
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 12
·3242
·
IF 5.076
Yu Sun,Jin Chen,Fengchao Wang,Yi Yin,Yan Jin,Jun Wang,Xiaogai Peng,Ruiyi Han,Canyun Zhang,Jinfang Kong,Jing Yang
Nowadays, Mn-doping is considered as a promising dissolution for the heavy usage of toxic lead in CsPbX3perovskite material. Interestingly, Mn-doping also introduces an additional photoluminescence band, which is favorable to enrich the emission gamut of this cesium lead halide. Here, a solution spraying strategy was employed for the direct preparation of CsPbxMn1−x(Br,Cl)3film through MnCl2doping in host CsPbBr3material. The possible fabrication mechanism of the provided approach and the dependences of material properties on Mn-doping were investigated in detail. As the results shown, Pb was partially substituted by Mn as expected. With the ratio of PbBr2:MnCl2increasing from 3:0 to 1:1, the obtained film separately featured green, cyan, orange-red and pink-red emission, which was caused by the energy transferring process. Moreover, the combining energy of Cs, Pb, and Mn gradually red-shifted resulted from the formation of Cs-Cl, Pb-Cl and Mn-Br coordination bonding as MnCl2doping increased. In addition, the weight of short decay lifetime of prepared samples increased with the doping rising, which indicated a better exciton emission and less defect-related transition. The aiming of current work is to provide a new possibility for the facile preparation of Mn-doping CsPbX3film material.Keywords:MnCl2doping;CsPbxMn1−x(Br,Cl)3;thin films;solution spraying
研究领域:
材料科学
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光学
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 32
·13619-13625
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IF 3.288
Jingkun Xu,Junfeng Qu,Haibao Shao,Shuhong Xu,Chunlei Wang,Yiping Cui
Metal halide perovskites have proven to be reliable white light-emitting materials from a single component. Ordered metal halide perovskite arrays have drawn much attention because of their applications in lasing and displays. However, perovskite arrays capable of emitting white light are still underresearched. Herein, a C4N2H14PbxMn1−xBr4 perovskite ring array based on a feasible and simple 2D colloidal crystal template is reported. By optimizing the molar feed ratio (C4N2H14Br2/PbBr2/MnBr2 is 4/3/1), bright white emission has been achieved, which originates from both C4N2H14PbBr4 and the Mn dopant. The diameters of perovskite rings can be tuned continuously from 2.5 μm to 6.2 μm by simply preprocessing the template as confirmed by observing the changes in the contact area between the annealed template and the substrate as well as the drying process of the perovskite precursor. Compared with perovskite thin films without a template, the perovskite ring array has better stability in humid environments. By coating an ultraviolet light-emitting diode (LED) chip with a C4N2H14PbxMn1−xBr4 ring array film, we fabricated white LEDs which showed high color quality with CIE color coordinates of (0.32, 0.32), a color rendering index of 85, and a correlated color temperature of 5645 K.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2023
·
IF 3.8
Yusheng Yang,Bai Sun,Guangdong Zhou,Chuan Ke,Jie Zhang,Yongzan Zhou,Shuangsuo Mao,Jiajia Qin,Yong Zhao
Since memristors have shown great application prospects in non-volatile memory, neural synapse, brain-like chips, artificial intelligence (AI) and quantum computers, the research of memristors has received extensive attention. In this work, the resistive switching (RS) device with Ag/SrTiO 3 (STO)/Ti structure was fabricated, and it can significantly improve the RS performance of device by doping Mn ions into STO to replace part of Ti ions . That is to say, the Ag/Mn-doped SrTiO 3 (SMTO)/Ti device exhibits larger resistance window and better retention at room temperature. Finally, through in-depth mechanistic analysis, a physical model of the conducting filament and Schottky emission was established to understand the charge transport mechanism and RS behavior of the device. In particular, it provides favorable factors for the migration of ions and electrons through the Mn doping because the substitution of Mn for Ti ions reduces the volume of the STO crystal while distorting its crystal shape since the ionic radius of Mn is smaller than that of Ti. This work provides an important way to improve the RS properties of ABO 3 -type perovskite-based resistive random access memory (RRAM), and helps to explore the cutting-edge applications of high-performance RS devices in information processing and AI.
研究领域:
材料科学
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电子工程
·
人工智能
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jiahao Liu,Qingnian Li,Hanyu Tu,Jie Feng,Xiaofei Fan,Ze Mi,Hongpei Han,Xiaoqian Ma,Qi Liang,Zheng Zhang,Hongshuai Hou,Pengfei Rong,Wenhu Zhou
Radiotherapy is a cornerstone in the treatment of malignant tumors, yet its efficacy is often hindered by intrinsic and acquired resistance mechanisms, notably limited radiation availability and tumor hypoxia within inner tumor region. This study introduces a multifunctional nanosensitizer, CD Bi,Mn-FA @CaP, with high tumor accumulation and deep penetration capabilities via dynamic conformational change. CD Bi,Mn-FA was bismuth manganese-doped carbon dots, offering radiosensitizing properties and catalase-like activity for oxygen generation. Folic acid modification further enhances tumor cell targeting. These carbon dots are encapsulated in calcium phosphate nanoparticles to form CD Bi,Mn-FA @CaP, which demonstrates improved in vivo circulation and tumor accumulation via the enhanced permeability and retention (EPR) effect. Upon encountering the acidic tumor microenvironment, the encapsulation degrades, releasing smaller CD Bi,Mn-FA particles that deeply penetrate tumor tissues. In vitro and in vivo experiments establish that CD Bi,Mn-FA @CaP effectively targets tumor tissue, enhances radiotherapy-induced apoptosis, and suppresses tumor growth. Notably, the nanoparticle achieves a 40 % tumor cure rate and ensures 100 % survival within 45 days post-treatment. Biocompatibility studies confirm minimal systemic impact, with efficient renal and fecal elimination, indicating promising clinical translational potential. This study introduces a novel radiation therapy sensitization strategy and underscores the potential of such size changeable nanoparticles as an advanced targeted drug delivery system for tumors.
研究领域:
生物医学工程
·
肿瘤学
·
纳米医学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL LETTERS
·
2024
·
IF 1.6
Jing Yang,Zhe Lv,Bo Yang,Xiangdong Guo,Feiyong Qu,Yanping Miao,Dehui Li,Hongmei Gao,Wei Li
Photoluminescence enhancement provides an effective way to improve the performance of quantum dots. In this study, lead(II) determination was demonstrated based on phosphorescence enhancement using 1-thioglycerol-capped Mn-doped ZnS quantum dots. Under the optimized conditions, good linear correlations were obtained for Pb2+ from 10.00 to 5000 nM and 0.05000 to 100.0 mM with correlation coefficients of 0.9997 and 0.9979 and a detection limit of 2.56 nM. The method demonstrates good linearity and selectivity, suitable sensitivity, easy operation, and the determination of Pb2+ in Chinese herbal medicine.
研究领域:
分析化学
·
环境科学
✓ 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）