JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
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IF 9.4
Yi Wang,Yuxin Wang,Yueting Wang,Jin Zhao,Yang Gao,Jingyi Liang,Tianjun Hu,Baoliang Lv,Ergui Luo,Jianfeng Jia
Carbon-based metal-free materials are emerging as leading candidates to replace noble-metal catalysts in the oxygen reduction reaction (ORR). Herein, we introduce a facile secondary carbonation technique for fabricating Se and N co-doped metal-free catalysts using a zeolite imidazole framework (ZIF-8) as the precursor. The optimal electrocatalyst, designated SeNC-900, exhibited good ORR performance under both alkaline and acidic conditions, with half-wave potentials of 0.864 V and 0.731 V (vs. RHE), respectively. Density functional theory (DFT) calculations reveal that the enhanced activity of SeNC-900 originates from Se doping, which triggers an increase in the intrinsic defects of sp 3 -hybridized C. Concurrently, the sp 3 -hybridized C, in concert with Se dopant, modulates the electronic structure of the active C atoms. This work not only underscores the significance of tuning the electronic structure to boost catalytic performance by enriching intrinsic defects but also presents a fresh insight into the effect of heteroatom doping on carbon-based materials for electrocatalysis.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Xiong Xiao,Linpeng Zheng,Qian Li,Chunhua Chen,Duanwei He,Xiuyan Wei,Zuguang Hu,Jianyun Yang,Guodong (David) Zhan
Chemical vapour deposition (CVD) rates are limited, making the preparation of thick diamonds challenging. We propose an efficient high pressure high temperature (HPHT) welding method for polycrystalline CVD diamond films. Multiple layers of CVD polycrystalline diamond films are welded into a monolithic structure under 15 GPa and 2100 °C. HPHT treated samples have an extremely high bond strength and the hardness of the weld layer exceeds 120 GPa. Microstructural analyses suggest the mechanism of HPHT welding: laser treatment transforms the carbon atoms on the CVD diamond film surface from SP3 to SP2 hybridization, forming a non-diamond-carbon/diamond coherent interface. Under HPHT conditions, the carbon atoms are again transformed from SP2 to SP3 hybridization, forming a strong interlayer bond through diffusion at the coherent interface. This method provides a new approach for rapidly preparing diamond bulk materials.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yanan Wang,Chengzhuang Su,Songru Wang,Hao Tang,Hailuo Liu,Dong Wang,Aimin Wu,Hao Huang
The high integration of electronic devices severely hinders heat dissipation, impacting intelligent system performance. This study fabricated Cr-incorporated amorphous carbon films on aluminum alloy heat sinks using pulsed bias arc ion plating to enhance thermal performance. Film morphology and composition were analyzed via transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The Cr content was precisely regulated by adjusting the Cr target current, which was set at 0 A, 20 A, 40 A, and 60 A, respectively, and the effect of the sp 2 /sp 3 hybridization ratio on thermal dissipation was investigated. Results showed that increased Cr content led to the formation of B1-CrC in the amorphous carbon matrix. Optimal thermal performance occurred at a Cr target current of 20 A, at which the Cr content reached 6.21 at.%, yielding an infrared emissivity of 0.67 and a thermal conductivity of 160.95 W·m −1 ·K −1 . LED lamps coated with the Cr/C film exhibited a surface temperature 9.7 °C lower than that of uncoated lamps, thereby demonstrating excellent heat dissipation. The study underscores the synergistic effect of radial thermal conductivity and infrared emissivity in improving heat sink efficiency under non-forced convection.
研究领域:
材料科学
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热管理技术
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产品关联
DOI
高影响因子
CHEMICAL PAPERS
·
2023
·Vol. 77
·期 6
·3495-3500
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IF 2.2
Shi Shaolin,Lan Huanshi,Tao Chenfa,Zhang Ying,Zhang Hao,Sun Qingdi,Zhang Xingcong,Guo Guanghui,He Qian,He Xiaohui,Ji Hongbing
Metal-free catalyst in imine synthesis was a great challenge due to the continuous rise in metal prices and unfriendly massive mining of metal. Herein, sp 2 /sp 3 hybridization nanodiamond–graphene (ND@G) was obtained by simple heat treatment of the commercially nanodiamonds (ND) under argon atmosphere, the as-prepared catalyst showed excellent activity and selectivity for directly imine synthesis. The physical structure changes of nanodiamond before and after heat treatment were well-characterization, and it was found that the nanodiamond surface layer changed from disordered sp 3 hybridized carbon to sp 2 /sp 3 core–shell structure. This study demonstrates the possibility of using metal-free catalysts for imine synthesis by nanodiamond.
研究领域:
催化化学
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材料科学
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有机合成
✓ 已验证
DOI
高影响因子
Energy & Environmental Materials
·
2024
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IF 13
Chenglong Shen,Qing Lou,Kaikai Liu,Guangsong Zheng,Runwei Song,Jinhao Zang,Xigui Yang,Xing Li,Lin Dong,Chongxin Shan
As one promising carbon-based material, sp 3 -hybrid carbon nitride has been predicted with various novel physicochemical properties. However, the synthesis of sp 3 -hybrid carbon nitride is still limited by the nanaoscale, low crystallinity, complex source, and expensive instruments. Herein, we have presented a facile approach to the sp 3 -hybrid carbon nitride nano/micro-crystals with microwave-assisted confining growth and liquid exfoliation. Actually, the carbon nitride nano/micro-crystals can spontaneously emerge and grow in the microwave-assisted polymerization of citric acid and urea, and the liquid exfoliation can break the bulk disorder polymer to retrieve the highly crystalline carbon nitride nano/micro-crystals. The obtained carbon nitride nano/micro-crystals present superior blue light absorption strength and surprising photoluminescence quantum yields of 57.96% in ethanol and 18.05% in solid state. The experimental characterizations and density functional theory calculations reveal that the interface-trapped localized exciton may contribute to the excellent intrinsic light emission capability of carbon nitride nano/micro-crystals and the interparticle staggered stacking will prevent the aggregation-caused-quenching partially. Finally, the carbon nitride nano/micro-crystals are demonstrated to be potentially useful as the phosphor medium in light-emitting-diode for interrupting blue light-induced eye damage. This work paves new light on the synthesis strategy of sp 3 -hybrid carbon nitride materials and thus may push forward the development of multiple carbon nitride research.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
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2024
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IF 5.3
Yuchen Feng,Siyi Lu,Qi Zhao,Tianyang Sun,Yuxi Shi,Guanyue Gao,Hao Wang,Jinfang Zhi
Carbon-based nanomaterials are viewed as preferred candidates as photothermal agents in tumor photothermal therapy due to their tailored structure and excellent biocompatibility. Herein, onion-like carbon (OLC) with controlled sp2/sp3-hybridized carbon ratios was explored as an effective photothermal reagent. The OLC was synthesized through thermal annealing of nanodiamonds, with an increase of the sp2 carbon content as the annealing temperature increased. The obtained OLC demonstrated high photothermal efficiency under 808 nm laser irradiation with a maximum value of 74.36% at an annealing temperature of 1400 °C. We suggest that a well-regulated amount of sp2 carbon in the OLC provided an abundance of conjugated π bonds, leading to enhanced light absorption and electron–phonon coupling. In addition, the OLC was conjugated with polyethylene glycol (PEG) and fluorescent molecules (FITC) to visualize the cellular uptake in HCT 116. In vivo tests demonstrated that the OLC-PEG-FITC exhibited good biocompatibility and achieved photothermal killing of cancer cells upon near-infrared laser irradiation. After treatment with the OLC-based photothermal agent, tumor tissues in tumor-bearing mice were effectively ablated. Taken together, these findings confirm the potential of the developed OLC as a photothermal agent for tumor therapy.
研究领域:
纳米技术
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生物医学工程
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材料科学
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肿瘤学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
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2021
·
IF 3.08
Weijie Ren,Jingjing Bai,Tingting Cai,Shijia Li,Ernan Pang,Hua Zhang,Zhenzhong Li
The heteroatom doping to achieve carbon dots has played a crucial part in exploring the fluorescence mechanism of multicolor emissions, which is closely related with the application development of such materials. Herein, a facile method was developed to synthesize three-color CDs via the co-doping of S and N elements with the assistance of ethanol solvent. The achieved CDs mainly emit blue, green and red lights, yet the photoluminescence quantum yields (FLQYs) generally decreases from 54.0% for B-CDs, 11.5% for G-CDs to 8.5% for R-CDs, respectively. Optical and structural characterizations of these CDs show that the variation of sp 2 - sp 3 hybridized domains resulted from the elements doping (S, N) fundamentally determines the color of CDs. The highest FLQYs of B-CDs in all CDs gives it an advantage to detect metal ions , which finds strong quenching only toward Ag + because of the interaction between Ag + and the cores. Likewise, these multicolor CDs attempt to fabricate CDs@PVP composite film emitted white-light as well as a clad material of WLED devices. The results indicate that the correlated color temperatures (CCT) in the ranges of cold and warm white lights can be obtained with different color rendering indexes (CRI) and luminous efficacies. Moreover, CCT and CRI are nearly up to the extremum at the same current value with increasing currents, implying that such CDs are potential as a kind of fluorescent nanomaterial to applicate to WLED device.
研究领域:
材料科学
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纳米技术
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光电技术
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2023
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IF 9.5
Sai Chen,Yuchuan Cheng,Zihui Zhao,Ke Zhang,Tingting Hao,Yi Sui,Wen Wang,Jiupeng Zhao,Yao Li
The incorporation of nanocarbon-based materials into electrorheological fluids has been shown to be an effective means of improving the electrorheological (ER) response. However, the mechanism of the sp2/sp3-hybridized carbon structure and high ER response is still under investigation. Herein, barium titanate@nanocarbon shell (BTO@NCs) composites are proposed and prepared by introducing carbonized polydopamine (C-PDA) into a shell. When the polymerization time of dopamine is tuned, the shell thickness, surface polar functional groups, and sp2/sp3-hybridized carbon can be effectively controlled. The maximum yield stress of the BTO@NCs-24 h ER fluid reaches 2.5 kPa under an electric field of 4 kV mm–1, which is attributed to the increased content of sp3 C–OH and oxygenous functional groups within the shell, resulting in a rapidly achievable polarization. Furthermore, the SiO2@NCs and TiO2@NCs ER fluids are also prepared with enhanced ER behavior in these phenomena, confirming an approach to high-performance ER fluids based on nanocarbon composites.
研究领域:
材料科学
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纳米技术
·
电化学
·
复合材料
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Hao Wang,Zixuan Yang,Yutong Gao,Ziyue Zheng,Jing Yang,Ting Wang,Dong Yang,Yajun Wang,Tongtao Li,Angang Dong
We present a coordination-inspired strategy for assembling binary nanocrystal superlattices (BNSLs) using CdSe nanotetrapods as symmetry-encoding building blocks. Exploiting their intrinsic tetrahedral geometry, which mimics the sp 3 hybridization of carbon atoms in a diamond lattice, we encode spatially defined binding sites that guide regioselective coassembly with spherical nanocrystals. By tuning the size ratio between components, we achieve both three-dimensional and two-dimensional BNSLs with long-range structural order. Notably, in NaCl-type BNSLs, the CdSe tetrapod sublattice defines a hypothetical porous network that is topologically analogous to a diamond lattice—an architecture difficult to realize using isotropic nanocrystals. The key advantage of this approach lies in its ability to translate molecular coordination principles into nanoscale assembly, thereby enabling access to architecturally complex and topologically rich lattices. A potential limitation, however, is the need for precise control over component size and shape to ensure high-quality ordering. By integrating molecular coordination concepts with nanocrystal assembly, this work establishes nanotetrapods as versatile symmetry-directing building blocks for the rational design of next-generation superlattices. This work establishes nanotetrapods as symmetry-directing building blocks for designing architecturally complex BNSLs, bridging molecular coordination chemistry with nanocrystal assembly.
研究领域:
材料科学
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纳米技术
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化学
·
凝聚态物理
·
自组装
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）