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Toward batch synthesis of high-quality graphene by cold-wall chemical vapor deposition approach

Nano Research 2022年第11期15卷 9683-9688页

作者： Kaicheng Jia Ziteng Ma Wendong Wang Yongliang Wen Huanxin Li Yeshu Zhu Jiawei Yang Yuqing Song Jiaxin Shao Xiaoting Liu Qi Lu Yixuan Zhao Jianbo Yin Luzhao Sun Hailin Peng Jincan Zhang Li Lin Zhongfan Liu Center for Nanochemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular ScienceCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Beijing Graphene Institute Beijing 100095China School of Physics and Astronomy University of ManchesterManchester M139PLUK State Key Laboratory for Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China Department of Engineering University of CambridgeCambridge CB30FAUK Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100871China Key Laboratory of Opto-Electronics Technology Ministry of EducationCollege of Electronic Science and TechnologyFaculty of Information TechnologyBeijing University of TechnologyBeijing 100024China State Key Laboratory of Heavy Oil Processing College of ScienceChina University of PetroleumBeijing 102249China School of Materials Science and Engineering Peking UniversityBeijing 100871China

chemical vapor deposition(CVD)has emerged as a promising approach for the controlled growth of graphene films with appealing scalability,controllability,and ***,the synthesis of high-quality graphene films still suffers from low production capacity and high energy consumption in the conventional hot-wall CVD *** contrast,owing to the different heating mode,cold-wall CVD(CW-CVD)system exhibits promising potential for the industrial-scale production,but the quality of as-received graphene remains inferior with limited domain size and high defect ***,we demonstrated an efficient method for the batch synthesis of high-quality graphene films with millimeter-sized domains based on CW-CVD *** reduced defect density and improved properties,the as-received graphene was proven to be promising candidate material for electronics and anti-corrosion *** study provides a new insight into the quality improvement of graphene derived from CW-CVD system,and paves a new avenue for the industrial production of high-quality graphene films for potential commercial applications.

关键词： graphene cold-wall chemical vapor deposition(CVD) defects electrical performance

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Covalent carbene modification of 2D black phosphorus

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Chinese chemical Letters 2022年第10期33卷 4640-4644页

作者： Lei Zhang Zhe-Ji Wang Bo Ma Xiang-Yang Li Yu-Chi Dai Guowen Hu Yong Peng Qiang Wang Hao-Li Zhang State Key Laboratory of Applied Organic Chemistry(SKLAOC) Key Laboratory of Special Function Materials and Structure Design(MOE)College of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000China Office of Laboratory and Equipment Management Lanzhou UniversityLanzhou 73000China Key Laboratory of Magnetism and Magnetic Materials of Ministry of Education School of Physical Science and TechnologyLanzhou UniversityLanzhou 730000China Tianjin Key Laboratory of Molecular Optoelectronic Sciences Department of ChemistryCollaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin UniversityTianjin 300072China

Black phosphorus(BP)has attracted an ever-growing interest due to its unique anisotropic two-dimensional structure,impressive photoelectronic properties and attractive application ***,the tools for bandgap engineering and passivation via covalent modification of BP nanosheets remain limited to diazonium salt and nucleophilic addition methods,so that developing new modification strategies for BP nanosheets is crucial to explore its physical and chemical properties and enrich the toolbox for ***,we report the covalent modification of liquid-phase exfoliated BP nanosheets based on a rational analysis of BP *** modification of BP is achieved via carbene,a highly reactive organic *** carbene modification improves the solubility and stability of BP *** microscopic and spectroscopic characterizations including infrared spectra,Raman spectra,X-ray photoelectron spectra,SEM and TEM were conducted to provide insights for the *** proof of the existence of covalent bonds between BP nanosheets and organic moieties confirms the successful ***,theoretical calculations were conducted to unveil the reaction mechanism of the two different types of bonds and the chemical property of two-dimensional BP.

关键词： Two-dimensional materials Black phosphorus Covalent functionalization Carbene Solubility

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Surface science approach to the heterogeneous cycloaddition of CO_(2) to epoxides catalyzed by site-isolated metal complexes and single atoms: a review

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Green chemical engineering 2022年第3期3卷 210-227页

作者： Valerio D'Elia Arjan W.Kleij Department of Materials Science and Engineering School of Molecular Science and EngineeringVidyasirimedhi Institute of Science and Technology(VISTEC)555 Moo 121210PayupnaiWangChanRayongThailand Institute of Chemical Research of Catalonia(ICIQ) Barcelona Institute of Science&TechnologyAv.Paisos Catalans 1643007TarragonaSpain Institute of Catalan Research and Advanced Studies(ICREA) Pg.Lluis Companys 2308010BarcelonaSpain

The cycloaddition of CO_(2) to epoxides to afford cyclic organic carbonates is an increasingly relevant non-reductive strategy to convert CO_(2) to useful products able to serve as high-boiling solvents,chemical intermediates,and monomers for the preparation of more sustainable *** development of efficient and robust hetero-geneous catalysts for such transformation is,therefore,crucial and can be carried out by several strategies that often require the preparation of sophisticated and/or expensive organic networks,linkers,or compounds.A different approach to the preparation of heterogeneous catalysts for CO_(2)-epoxide coupling is by applying surface science methodologies to graft molecular fragments or single atoms on various supports leading to well-defined active *** this context,surface organometallic chemistry(SOMC),along with comparable methodologies,is a valuable approach for the preparation of efficient,single-site Lewis acids and catalysts for the target cycloaddition reaction on metal oxides,whereas,other grafting methodologies,can be applied to prepare analogous catalysts on different kinds of ***,we discuss very recent advances in the application of surface methodologies for the preparation of single atom catalysts as an increasingly relevant approach towards highly active Lewis acids for the cycloaddition of CO_(2) to ***,we show that Lewis acids and catalysts prepared by facile surface methodologies hold significant potential for future application is the synthesis of cyclic carbonates from CO_(2).

关键词： Cyclic carbonates Surface science Single atoms Surface organometallic chemistry Catalysis

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Strategies in boosting photosensitization for biomedical applications

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science China Chemistry 2022年第4期65卷 647-649页

作者： Ming Chen Ryan T.K.Kwok Youhong Tang Dan Ding College of Chemistry and Materials Science Jinan UniversityGuangzhou 510632China Frontiers Science Center for Cell Responses State Key Laboratory of Medicinal Chemical BiologyKey Laboratory of Bioactive MaterialsMinistry of EducationCollege of Life SciencesNankai UniversityTianjin 300071China Department of Nephrology Huai’an Hospital Affiliated to Xuzhou Medical College and Huai’an Second HospitalHuai’an 223002China Department of Chemistry The Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionInstitute for Advanced StudyDepartment of Chemical and Biological EngineeringThe Hong Kong University of Science and TechnologyHong KongChina Australia-China Joint Centre for Personal Health Technologies Medical Device Research InstituteCollege of Science and EngineeringFlinders UniversitySouth Australia 5042Australia Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates South China University of TechnologyGuangzhou 510640China

Photodynamic therapy(PDT)has emerged as an effective treatment method for its few adverse effects,little invasiveness,short treatment time and low cost[1,2].The rapid development of PDT has dramatically boosted its mu... 详细信息

关键词： treatment boosting immunotherapy

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Enhancing PV solar panel efficiency through integration with a passive Multi-layered PCMs cooling system: A numerical study

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International Journal of Thermofluids 2024年 23卷

作者： Sheikh, Yahya Jasim, Muhammad Qasim, Muhammad Qaisieh, Alaa Hamdan, Mohammad O. Abed, Farid Materials Science and Engineering Program American University of Sharjah Sharjah United Arab Emirates Department of Mechanical Engineering American University of Sharjah Sharjah United Arab Emirates Department of Chemical and Biological Engineering American University of Sharjah Sharjah United Arab Emirates Civil Engineering Department American University of Sharjah Sharjah United Arab Emirates

Photovoltaic (PV) solar cells are at the forefront of sustainable electricity generation technologies, yet they exhibit relatively low efficiency. Typically, less than 20 % of the solar energy absorbed is converted into electrical energy, with the remainder converts into heat. This heat increases the PV panel's operating temperature, negatively impacting its efficiency and life expectancy. To mitigate this, a novel approach using multi-layered phase change materials (PCMs) has been examined in this study. The approach involves integrating organic PCMs (OPCMs) with metallic PCMs (MPCMs), enhancing PV panel cooling efficiency by attaching the multi-layer PCM to the panel's rear. This study, employing ANSYS FLUENT software's solidification and melting model, explores the impact of multi PCM layers thickness and total multi layers thickness on PV cell temperature and electrical efficiency. The analysis reveals that a multi-layered PCMs configuration with a thickness ratio of 15:85 between MPCM (CERROLOW-117® alloy) and OPCM (RT44) significantly decreases temperature rise in PV cells, resulting in a temperature drop of 59.6 °C. This improvement boosts PV panel performance by an average of 35.8 % compared to panels lacking cooling systems during peak sun hours under hot climate conditions characterized by ambient temperatures of 40 °C and high solar radiation exceeding 1000 W/m². This suggests that a carefully optimized PCM layering approach could markedly improve PV system efficiency, offering a practical solution to the overheating problem and extending the operational life of PV installations. © 2024 The Author(s)

关键词： Phase change materials

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Improved camptothecin encapsulation and efficacy by environmentally sensitive block copolymer/chitosan/fucoidan nanoparticles for targeting lung cancer cells

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International Journal of Biological Macromolecules 2024年第Part2期277卷 133901页

作者： Don, Trong-Ming Hong, Yu-Ting Jheng, Pei-Ru Chuang, Er-Yuan Huang, Yi-Cheng Department of Chemical and Materials Engineering Tamkang University New Taipei City Taiwan College of Life Sciences Department of Food Science National Taiwan Ocean University Keelung Taiwan Graduate Institute of Biomedical Materials and Tissue Engineering International PhD Program in Biomedical Engineering Taipei Medical University Taipei Taiwan Cell Physiology and Molecular Image Research Center Taipei Medical University–Wan Fang Hospital Taipei Taiwan

In this study, thermo-sensitive poly(N-isopropyl acrylamide) (PNP) was polymerized with pH-sensitive poly(acrylic acid) (PAA) to prepare a PAA-b-PNP block copolymer. Above its cloud point, the block copolymer self-assembled into nanoparticles (NPs), encapsulating the anticancer drug camptothecin (CPT) in situ. Chitosan (CS) and fucoidan (Fu) further modified these NPs, forming Fu-CPT-NPs to enhance biocompatibility, drug encapsulation efficiency (EE), and loading content (LC), crucially facilitating P-selectin targeting of lung cancer cells through a drug delivery system. The EE and LC reached 82 % and 3.5 %, respectively. According to transmission electron microscope observation, these Fu-CPT-NPs had uniform spherical shapes with an average diameter of ca. 250 nm. They could maintain their stability in a pH range of 5.0–6.8. In vitro experimental results revealed that the Fu-CPT-NPs exhibited good biocompatibility and had anticancer activity after encapsulating CPT. It could deliver CPT to cancer cells by targeting P-selectin, effectively increasing cell uptake and inducing cell apoptosis. Animal study results showed that the Fu-CPT-NPs inhibited lung tumor growth by increasing tumor cell apoptosis without causing significant tissue damage related to generating reactive oxygen species in lung cancer cells. This system can effectively improve drug-delivery efficiency and treatment effects and has great potential for treating lung cancer. © 2024 Elsevier B.V.

关键词： Nanoparticles

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Mediation of Colloidal Encounter Dynamics by Surface Roughness

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Physical Review Letters 2025年第8期134卷 088201-088201页

作者： Robert G. Felsted Jaehun Chun Gregory K. Schenter Alexander B. Bard Xiaojing Xia Peter J. Pauzauskie Department of Chemistry University of Washington Seattle Washington 98195 USA Physical Sciences Division Physical and Computational Sciences Directorate Pacific Northwest National Laboratory Richland Washington 99354 USA Levich Institute and Department of Chemical Engineering CUNY City College of New York New York 10031 USA Department of Molecular Engineering and Science University of Washington Seattle Washington 98195 USA Materials Science and Engineering Department University of Washington Seattle Washington 98195 USA

Rigorous understanding of assembly in colloidal systems is crucial to the development of tailored nanostructured materials. Despite extensive studies, a mechanistic understanding of the dynamics governing encounters of colloidal particles remains an ongoing challenge. We study colloidal encounter dynamics by inducing assembly through optical tweezers that impose an external attractive field for cubic-phase sodium yttrium fluoride nanocrystals. We show that surface roughness of the nanocrystals is a decisive factor for contact leading to assembly between the nanocrystals, manifested by the roughness-dependent hydrodynamic resistivity. This provides direct evidence that dynamics are equally important to energetics in understanding assembly.

关键词： Nanocrystals

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High-efficiency organic solar cells processed from a halogen-free solvent system

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science China Chemistry 2023年第8期66卷 2380-2388页

作者： Yueling Su Zicheng Ding Rui Zhang Weibing Tang Wenliang Huang Zhichao Wang Kui Zhao Xiaochen Wang Shengzhong(Frank)Liu Yongfang Li Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an710119China Department of Physics Chemistry and Biology(IFM)Linköping UniversityLinköpingSweden Dalian National Laboratory for Clean Energy iChEMDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing100190China

The use of non-halogenated solvents for the green manufacture of high-efficiency organic solar cells(OSCs)is important for their future ***,the power conversion efficiency(PCE)of the non-halogenated solvent processed OSCs is generally lower than their halogenated counterpart due to the poor film microstructure caused by the solubility ***,we propose a halogen-free solvent system to optimize film microstructure of the photovoltaic blend based on the polymer donor D18and small-molecule acceptor(SMA)L8-BO towards high-efficiency *** solvent system is consisted of a main solvent carbon disulfide and an additive paraxylene,where the former ensures the good solution-processability and promotes the solution aggregation of L8-BO,and the latter can finely control the phase-separation process by selectively dissolving the *** solvent combination robustly produces a high-quality active layer,i.e.,the bicontinuous networks of donor and acceptor with nano-sized phase-separation and strongπ-π*** the effective charge generation,transport and collection,the resulting device from the non-halogenated solvent system shows a high PCE of 17.50%,which is comparable to that of the device prepared from the halogenated solvent chloroform(ca.17.11%).This article proposes a new strategy for the green fabrication of high-efficiency OSCs to accelerate their industrialization.

关键词： organic solar cells small molecule acceptor film microstructure non-halogenated solvent solvent engineering

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Synthesis of High-Value Bio-Based Polyamide 12,36 Microcellular Foams with Excellent Dimensional Stability and Shape Recovery Properties

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Polymers 2024年第1期16卷 159页

作者： Chen, Chin-Wen Ranganathan, Palraj Mutharani, Bhuvanenthiran Shiu, Jia-Wei Rwei, Syang-Peng Chang, Yen-Hsiang Chiu, Fang-Chyou Department of Molecular Science and Engineering Institute of Organic and Polymeric Materials Research and Development Center of Smart Textile Technology National Taipei University of Technology Taipei10608 Taiwan Department of Chemical and Materials Engineering Chang Gung University Taoyuan 333 Taiwan Department of General Dentistry Chang Gung Memorial Hospital Taoyuan 333 Taiwan

The search for alternatives to petroleum-based thermoplastic polyamide elastomers (TPAEs) has recently drawn great interest. In this study, a bio-massed TPAE, PA12,36, was synthesized using 1,12-dodecanediamine (DDA) and fatty dimer acid (FDA, PripolTM1009) precursors via catalyst and solvent-free melt polycondensation. The molecular structure and molecular weight of the PA12,36 were characterized by 1H NMR, FTIR, and GPC. PA12,36 displayed a low melting temperature of 85.8 °C, an initial degradation temperature of 425 °C, and a glass-transition temperature of 30.4 °C, whereas it sustained satisfactory tensile strength (10.0 MPa) and superior strain at break (1378%). Furthermore, PA12,36 was foamed by supercritical CO2, and the cell size, cell density, and porosity were determined. The entangled long-chained FDA component generated a physically crosslinked network, which promoted the melt viscosity of PA12,36 against elongations of foam cell growth and increased foamability significantly. As a result, uniform structured cellular foams with a cell diameter of 15–24 µm and high cell density (1011 cells/cm3–1012 cells/cm3) were successfully achieved. The foaming window was widened from 76 to 81 °C, and the expansion ratio was increased from 4.8 to 9.6. Additionally, PA12,36 foam with a physically crosslinked structure presented a better creep shape recovery percentage (92–97.9%) and sturdier dimensional stability. This bio-based PA12,36 foam is a promising candidate to replace petroleum-based thermoplastic elastomer foams for engineering applications, particularly shoe soles. © 2024 by the authors.

关键词： Cell proliferation

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Synthesis, performance, and application of bimetallic composite nanocatalysts: A novel highly efficient and recyclable PtNix nanoparticles supported on multi-walled carbon nanotubes for catalytic hydrogenation of unsaturated copolymers

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Journal of the Energy Institute 2025年 119卷

作者： Saeed, AlaaddinM.M. Cao, Gui-Ping Qian, Shao-Kang Al-Fatesh, Ahmed S. Abahussain, Abdulaziz A.M. Shehua, Mustapha Sani Ali, Nawab UNILAB State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai200237 China Chemical Engineering Department College of Engineering King Saud University P.O. Box 800 Riyadh11421 Saudi Arabia Shanghai Key Laboratory of Functional Materials Chemistry School of Chemistry and Molecular Engineering East China University of Science and Technology Meilong Road 130 Shanghai200237 China

The catalytic hydrogenation of polymers and copolymers is an efficient method to produce high value hydrogenated products. Here, we successfully synthesized monometallic (Pt/MWCNTs) and bimetallic (PtNix/MWCNTs) composite nanocatalysts using a simple chemical reduction method for the selective hydrogenation of styrene-butadiene-styrene (SBS) copolymer. The bimetallic composite nanocatalysts with Pt-to-Ni ratios of 1:1, 1:2, 1:3, and 1:4 showed a higher catalytic activity compared with monometallic composite nanocatalysts. The crystal structure and elemental analysis of the synthesized nanocatalysts are characterized by XRD and XPS. The change of binding energy due to the transfer of valence electrons between Pt and Ni was verified via XPS analysis. The PtNix nanoparticles were firmly anchored on the MWCNTs, as observed by TEM and HRTEM analysis. The nanocatalysts are also with a mesoporous, face-centered cubic structure and high thermal stability. As a result, the nanocatalysts showed excellent performance, stability, and recyclability towards the benzene rings and unsaturated double bonds hydrogenation in the SBS copolymer, implying that the bimetallic composite nanocatalysts have effectively eliminated diffusion limitations and enhanced SBS molecules accessibility to active sites. Simultaneously, GPC, FTIR, NMR, TG, and DSC analysis were used to characterize the SBS and its hydrogenated product (cyclic block copolymer). Thermogravimetric analysis proved that cyclic block copolymer possesses a higher heat resistance (426 °C) compared to SBS (416 °C). © 2024 The Energy Institute

关键词： Multiwalled carbon nanotubes (MWCN)

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