COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Xiaoyi Lu,Shangshang Zhang,Weiguang Shi,Dan Cheng,Hong-Wei Li,Shihan Xu,Biao Dong
Carbon dots (CDs) are important zero-dimensional materials with excellent luminescent properties. However, the mechanism of CDs photoluminescence is still an open debate, which significantly hinders the development of CDs with desired optical properties. In this work, bright blue fluorescent carbonized 1.0 G polyamine-amine polymer dots (NCPDs) has been prepared by a simple hydrothermal method, with a quantum yield of 57 %. The dominant luminescence of the NCPDs is attributed to the surface states based on synergistic hybridization between the carbon backbones and connected functional groups at below 120 °C. Photoluminescence transforms from the surface states to the surface - carbon core states, and then to carbon core states from 120° to 150 °C. Meanwhile, the degree of carbonization increases along with the size of NCPDs growing from 1.36 to 3.20 nm, and the NCPDs present excitation-dependent emission properties. Due to the remarkable fluorescence property of NCPDs, Cu 2+ determination has been carried out in the aqueous phase, and the detection limit is 9 nM, which is much lower than the international minimum standard (20 μM). NCPDs present high selectivity and sensitivity toward detecting Cu 2+ , and provide potential applications in detecting metal pollution in the environmental water.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Na Li,Deli Lu,Jinlong Zhang,Lingzhi Wang
Yolk-shell structured C@Li 4 Ti 5 O 12 microspheres composed of carbon core (ca. 500 nm) and sea urchin-like Li 4 Ti 5 O 12 shell (ca. 400–500 nm) are formed by hydrothermally treating the core–shell structured C@TiO 2 in the EtOH/H 2 O solution of LiOH and calcining it in N 2 atmosphere. Yolk-shell structured TiO 2 -type lithium ion sieve is further transformed from C@Li 4 Ti 5 O 12 through the acid treatment, which have a high specific surface area of 201.74 m 2 /g. The composite shows adsorption capacity towards Li + proportional to the pH value in the range of 7–13. The adsorption reaches equilibrium within 2 h with a high equilibrium adsorption capacity of 28.46 mg/g under alkaline conditions, which is ca. 8 times the value of ordinary TiO 2 lithium ion sieve with comparable size and surface area, demonstrating the enhanced adsorption is attributed to the generation of more accessible surficial voids by replacing internal part with light carbon core. The adsorption follows Freundlich and pseudo-second-order kinetic models with a high rate constant of 0.015 g/(mg·min). The selective adsorption to Li + is verified in the presence of K + , Na + , Ca 2+ and Mg 2+ .
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Baoguo Zhao,Guoquan Suo,Rongrong Mu,Chuanjin Lin,Jiarong Li,Xiaojiang Hou,Xiaohui Ye,Yanling Yang,Li Zhang
The growing demand for clean energy has heightened interest in sodium-ion batteries (SIBs) as promising candidates for large-scale energy storage. However, the sluggish reaction kinetics and significant volumetric changes in anode materials present challenges to the electrochemical performance of SIBs. This work introduces a hierarchical structure where WS 2 is confined between an inner hard carbon core and an outer nitrogen-doped carbon shell, forming HC@WS 2 @NCs core–shell structures as anodes for SIBs. The inner hard carbon core and outer nitrogen-doped carbon shell anchor WS 2 , enhancing its structural integrity. The highly conductive carbon materials accelerate electron transport during charge/discharge, while the rationally constructed interfaces between carbon and WS 2 regulate the interfacial energy barrier and electric field distribution, improving ion transport. This synergistic interaction results in superior electrochemical performance: the HC@WS 2 @NCs anode delivers a high capacity of 370 mAh g −1 at 0.2 A/g after 200 cycles and retains261 mAh g −1 at 2 A/g after 2000 cycles. In a full battery with a Na 3 V 2 (PO 4 ) 3 cathode, the Na 3 V 2 (PO 4 ) 3 //HC@WS 2 @NC full-cell achieves an impressive initial capacity of 220 mAh g −1 at 1 A/g. This work provides a strategic approach for the systematic development of WS 2 -based anode materials for SIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Yu Kang,Yuan Zheng,Zi-Yi Zhang,Bin Li,Yao-Yang Liu,Yun-Hong Xie,Zhong-Feng Li,Xiao-Yan Tang,Jing Chen,Li Wang,Chao Xu
In situ characterization of coordination species and their evolution are crucial for effective lanthanide separation and recycling. Current technical approaches often operate under constrained conditions, requiring complex equipment, experimental setups, and sometimes intricate data interpretation. Herein, we demonstrate that carbon NMR titrations offer a valuable approach for in situ coordination analysis of lanthanides, particularly for highly fused preorganized ligands that offer more NMR-active carbons than traditional proton NMR. Two representative ligands of both lipophilic and hydrophilic in nature were investigated, and the resulting carbon NMR titration data were analyzed. Comparisons with IR and single-crystal data showed that NMR provided insights not only into the evolution of coordination species but also into changes in the electron distribution during complex formation. Additionally, we discussed inconsistencies between atomic charge populations obtained from carbon NMR and those from Mulliken and Hirshfeld calculations. With advancements in NMR technology and the availability of higher-field NMR instruments, we believe NMR titrations will play an increasingly significant role in unravelling the complex solution coordination chemistry of f-block elements.
研究领域:
化学
·
配位化学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Fenglian Tong,Jixi Guo,Yanliang Pan,Huibiao Liu,Yan Lv,Xueyan Wu,Dianzeng Jia,Xiaojuan Zhao,Shengchao Hou
Commercial graphite with low theoretical capacity cannot meet the ever-increasing requirement demands of lithium-ion batteries (LIBs) caused by the rapid development of electric devices. Rationally designed carbon-based nanomaterials can provide a wide range of possibilities to meet the growing requirements of energy storage. Hence, the porous walnut anchored on carbon fibers with reasonable pore structure, N -self doping (10.2 at%) and novel structure and morphology is designed via interaction of inner layer polyethylene oxide and outer layer polyacrylonitrile and polyvinylpyrrolidone during pyrolysis of the obtained precursor, which is fabricated by coaxial electrospinning. As an electrode material, the as-made sample shows a high discharge capacity of 965.3 mA h g −1 at 0.2 A g −1 in the first cycle, retains a capacity of 819.7 mA h g −1 after 500 cycles, and displays excellent cycling stability (475.2 mA h g −1 at 1 A g −1 after 1000 cycles). Moreover, the capacity of the electrode material still keeps 260.5 mA h g −1 at 5 A g −1 after 1000 cycles. Therefore, the obtained sample has a bright application prospect as a high performance anode material for LIBs. Besides, this design idea paves the way for situ N -enriched carbon material with novel structure and morphology by coaxial electrospinning.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 12
·1-8
·
IF 5.479
Hou Guorong,Yun Yanjing,Wang Minqiang,Wang Ying,Chen Hao,Zhang Longcheng,Wang Feng,Xia Qingyou,Liu Yang,Lu Zhisong,Bao Shu-Juan
A corn-like CeO 2 /C coaxial cable textured by a cerium oxide shell and a carbon core was designed to sense NO. The carbon core possesses high electrical conductivity, and the CeO 2 surface delivers excellent electrocatalytic activity. The sensor, typically operated at 0.8 V (vs. Ag/AgCl), exhibits a detection limit of 1.7 nM, which is 4-times lower than that of CeO 2 nanotubes based one (at S/ N = 3). It also displays wide linear response (up to 83 μM), a sensitivity of 0.81 μA μM −1 cm −2 , and fast response (2 s). These values are highly competitive to that of a CeO 2 tube (0.92 μA μM −1 cm −2 and 2 s). The sensor was used to quantify NO that is released by Aspergillus flavus.
Schematic representation of corn-like CeO 2 /C which can more sensitively and effectively detect NO released from A. flavus than when using CeO 2 nanotubes, benefitting from its unique coaxial cable structure.
研究领域:
材料科学
·
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Ping-an Yang,Wenjiao Deng,Haibo Ruan,Zhengwei Qu,Rui Li,Lirui Wang,Jiufei Luo,Zhihao Zhou,Mengjie Shou,Xin Huang,Qiao Chen,Xinglong Gong
The study of designing and developing ferromagnetic nanocomposites with both microwave absorption (MA) and corrosion protection properties through microscopic heterogeneous interfacial engineering and crystal phase engineering remains challenging. In this study, Fe@C core–shell nanowires (FCNWs) are obtained by magnetic field-controlled in situ reduction method and annealing process to de-regulate the carbon shell thickness and carbon morphology. The enhancement of Fe-C heterogeneous relative interfacial effects and dielectric/magnetic response is revealed using density functional theory and simulated electromagnetic field distribution, and the modulation of the amorphous carbon/graphitic carbon ratio achieves the enhancement of dipole polarization in the low-frequency region. The FCNWs absorber had a minimum reflection loss (RL min ) of −47.6 dB at a thickness of 4.9 mm, and the maximum effective absorption bandwidth (EAB max ) was achieved at 5.5 mm up to 4.0 GHz. In addition, the shielding effect of the graphitic carbon shell on the corrosion medium and the addition of additional electron conduction pathways allow the FCNWs absorber to obtain smaller corrosion currents and larger polarization resistances compared to Fe nanowires. Thus, modulation of atomic-scale heterogeneous interfaces and crystal phases has great potential in modulating the dielectric response.
研究领域:
材料科学
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电磁学
·
防腐蚀工程
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2016
·Vol. 9
·期 1
·163-169
·
IF 1.915
Qinglin Sheng,Yu Shen,Jian Zhang,Jianbin Zheng
In this work, attractive core–shell structured nanomaterials consisting of Ni doped Ag@C were synthesized. Further, a hydrogen peroxide (H2O2) sensor was fabricated by modifying the Ni doped Ag@C (Ni/Ag@C) nanocomposites onto the surface of a glassy carbon electrode (GCE). The composition and morphology of the Ni/Ag@C nanocomposites were characterized by scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy and Fourier transform infrared spectroscopy. The results indicated that the nanocomposites were synthesized successfully and showed similar grain sizes and favorable dispersity. The electrochemical and electrocatalytic properties of the Ni/Ag@C nanocomposites were studied by cyclic voltammetry. An electrochemical investigation showed that the Ni/Ag@C nanocomposite modified GCE exhibited a good electrocatalytic ability for H2O2 reduction and it was used for the determination of H2O2. The linear range for H2O2 determination was from 0.03 mM to 17.0 mM with a detection limit of 0.01 mM (S/N = 3). The sensitivity was 22.94 μA mM−1 cm−2. It is expected that the application of the Ni/Ag@C nanocomposites could be extended to the construction of other sensors and applications in various sensing fields.
研究领域:
材料科学
·
分析化学
·
纳米技术
·
电化学
·
生物传感器
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Shuang Liang,Guozhe Sui,Dongxuan Guo,Ze Luo,Rongping Xu,Hong Yao,Jinlong Li,Chao Wang
The development of efficient heterojunctions with enhanced photocatalytic properties is considered a promising approach for photocatalytic hydrogen production. In this study, graphitic carbon nitride (g-C 3 N 4 )-wrapped nickel-doped zinc oxide/carbon (Ni-ZnO@C/g-C 3 N 4 ) core-double shell heterojunctions with unique core-double shell structures were employed as efficient photocatalysts through an innovative approach. Ni doping can enhance the intensity and range of visible light absorption in ZnO, and the carbon core coupled with the hollow double-shell structure can accelerate the charge transfer rate and improve the photon utilization efficiency. Meanwhile, the construction of the Z-scheme heterojunction extended the electron-hole pair transport path. In addition, the Z-scheme charge-transfer mechanism of Ni-ZnO@C/g-C 3 N 4 under simulated sunlight was verified by photoluminescence (PL) and electron spin resonance (ESR) experiments. As a result, the obtained photocatalyst acquired a high hydrogen evolution rate of 336.08 μmol g −1 h −1 , which is 36.49 times higher than that of pristine ZnO. Overall, this work may provide a pathway for the construction of highly efficient photocatalysts with unique core-double shell structures.
研究领域:
材料科学
·
光催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 15
·14573-14579
·
IF 2.195
Teng Zhen,Zeng Sifan,Feng Wanlin,Zhu Lini,Tan Yongqiang,Han Xiaochun,Chen Chen,Zhang Haibin
Fe-Fe 3 C@C composites are successfully synthesized via a facile pyrolysis process. Experimental results indicate that Fe-Fe 3 C nanoparticles are closely parceled among amorphous carbon and exhibit a core–shell structure. The obtained materials display excellent microwave absorption performance with an optimal reflection loss of − 35.6 dB at 17.2 GHz, and an effective absorbing bandwidth of 4 GHz (from 12.4 to 16.4 GHz) with the coating thickness of 2 mm. The magnetic loss derived from Fe core and dielectric loss on carbon materials as well as a good impedance matching are believed to play decisive roles for this favorable microwave absorbing properties. The composites are considered to be good candidates for microwave absorption applications.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2014
·Vol. 18
·期 9
·2573-2579
·
IF 2.234
Sun Dawei,An Bonan,Zhang Beibei,Ru Qiang,Hou Xianhua,Hu Shejun
SnSb/C core-shell powder has been successfully prepared by modified carbothermal reduction method. The shape, size, morphology, and electrochemical properties of the SnSb/C core-shell powder have been investigated. SnSb particles are completely encapsulated by amorphous carbon shell, and the surface of SnSb/C composite has been characterized with porous structure. The composite has a relatively high BET surface area of 253 m 2 g −1 . The composite exhibits relatively good capacity retention for 50 cycles at a constant current density of 100 mA g −1 and show excellent rate performance when the current ranges from 50 to 200 mA g −1 . The improvement of reversible capacity and cyclic performance is attributed to loose and amorphous surface structure which could buffer volume variations through cycle process.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2013
·Vol. 15
·期 7
·1-9
·
IF 2.175
Wang Haibo,Jin Quan,Yang Lufeng,Liu Yingliang
Precious metals core/shell nanospheres were synthesized via a one-pot method, we investigate a new route using 2,4-dihydroxybenzoic acid and formaldehyde served as carbonaceous shell, ethanol reducing metal particles served as core and l -lysine initiating to obtain core/shell structures. This synthesis was reflux in ethanol system at a low temperature of 80°. Uniform size, homogeneous morphology, and high purity of the product were synthesized by this method. Moreover, shell thickness are tunable when we change the dosage of metal and PVP ( l -lysine). The core/shell nanoparticles have the core diameter of 8–12 nm and the sphere shell diameter of 100–140 nm. Ag@C, Au@C, and Pd@C were prepared via the same method. The different dosage of PVP and sequence of formaldehyde are investigated in order to clarify the reaction mechanism. Based on this, we give a reasonable explanation to the universal method. TEM, XRD, FTIR, UV-spectra, and EDS (HRTEM) were used to characterize the core/shell nanostructures.
研究领域:
材料科学
·
纳米技术
✓ 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）