检索结果-南通市图书馆

Spatially confined synthesis of TiNb_(2)O_(7)quantum dots onto mesoporous carbon and Ti_(3)C_(2)T_(X)MXene for boosting lithium storage

引用

Green Energy & Environment 2025年第2期10卷 358-366页

作者： Daoguang Sun Cheng Tang Haitao Li Xinlin Zhang Guanjia Zhu Zhen-Dong Huang Aijun Du Haijiao Zhang Institute of nanochemistry and Nanobiology School of Environmental and Chemical EngineeringShanghai UniversityShanghai200444China School of Chemistry and Physics and Centre for Materials Science Queensland University of TechnologyBrisbaneQLD4001Australia State Key laboratory for Organic Electronics and Information Displays&Jiangsu Key laboratory for Biosensors Institute of Advanced Materials(IAM)Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)Nanjing University of Posts and Telecommunications9 Wenyuan RoadNanjing210023China

TiNb_(2)O_(7)has been emerged as one of the most promising electrode materials for high-energy lithium-ion ***,limited by the slow electron/ion transport kinetics,and insufficient active sites in the bulk structure,the TiNb_(2)O_(7)electrode still suffers from unsatisfactory lithium storage ***,we demonstrate a spatially confined strategy toward a novel TiNb_(2)O_(7)-NMC/MXene composite through a triblock copolymer-directed one-pot solvothermal route,where TiNb_(2)O_(7)quantum dots with a particle size of 2-3 nm are evenly embedded into N-doped mesoporous carbon(NMC)and Ti_(3)C_(2)T_(X)***,the as-prepared TiNb_(2)O_(7)-NMC/MXene anode exhibits a high reversible capacity(486.2 mAh g^(-1)at 0.1 A g^(-1)after 100 cycles)and long cycle lifespan(363.4 mAh g^(-1)at ss1 A g^(-1)after 500 cycles).Both experimental and theorical results further demonstrate that such a superior lithium storage performance is mainly ascribed to the synergistic effect among 0D TiNb_(2)O_(7)quantum dots,2D Ti_(3)C_(2)T_(X)MXene nanosheets,and N-doped mesoporous *** strategy presented also opens up new horizon for space-confined preparation of high-performance electrode materials.

关键词： TiNb_(2)O_(7)quantum dots Ti_(3)C_(2)T_(X)MXene Mesoporous carbon Confined synthesis Lithium-ion batteries

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Surface charge induced tuning of electrical properties of CVD assisted graphene and functionalized graphene sheets

引用

Journal of Materials Science & Technology 2019年第1期35卷 151-158页

作者： Manash Jyoti Deka Devasish Chowdhury Material nanochemistry laboratory Physical Sciences Division Institute of Advanced Study in Science and Technology

We demonstrate a new approach to tune the electrical properties of graphene and functionalized graphene. Graphene was synthesized using thermal chemical vapour deposition(TCVD) method on copper foil using precursor gas acetylene and co-catalyst H2 gas. TCVD assisted graphene was successfully transferred onto a silicon wafer. Transferred graphene sheet was then functionalized to prepare graphene oxide(GO) and reduced graphene oxide(rGO). Different surface charge carbon nanoparticles, e.g. carbon nanoparticle with net positive charge and carbon nanoparticle with net negative charge were then immobilized on transferred graphene and functionalized graphene sheets. The functionalized graphene and charge mobilized functionalized graphene were characterized by Uv–vis spectroscopy,Fourier transformed infrared spectroscopy, scanning electron microscopy, and Raman spectroscopy. After immobilization of carbon nanomaterials, the ac electrical conductivity was found to increase due to enhancement of the surface charge, electron density, and mobility. It was observed that negative surface charge immobilized graphene and functionalized graphene show higher conductivity. Thus, the electrical property of graphene and functionalized graphene can be tuned by surface modification with different surface charge carbon nanomaterials.

关键词： Graphene Chemical Vapour Deposition (CVD) Surface charge

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synthesis of ordered mesoporous γ-Al_2O_3:Eu^(3+) with high luminous performance and thermal stability

引用

Journal of Rare Earths 2011年第8期29卷 732-736页

作者：余彩霞阳区沙磊刘应亮 Department of Chemistry and Institute of nanochemistry Jinan University

An efficient and convenient one-step process was developed for synthesizing new effective red luminous materials through ordered mesoporous γ-alumina assembling with Eu3＋. Employing P123 as a structure-directing agent and hydrochloric acid, citric acid as pH adjustor, ordered mesoporous γ-alumina was fabricated by simple sol-gel method. The pore structure was characterized by X-ray diffraction （XRD）, N2 adsorption-desorption isotherms and transmission electron microscopy （TEM）. The as-synthesized γ-aluminas had narrow pore-size distribution （5–7 nm）, large surface area （246 m2/g） and high thermal stability （750–1000 oC）. The luminous property of materials was characterized by Photoluminescence （PL） spectra. The γ-Al2O3：Eu3＋ materials had efficient luminescence, and the emission strength was related to the content of Eu3＋.

关键词： ordered mesoporous γ-alumina sol-gel method one-step luminescene chromatic purity rare earths

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Observation of Topological Nodal-Ring Phonons in Monolayer Hexagonal Boron Nitride

引用

Chinese Physics Letters 2025年第2期 147-152页

作者：陶志禹王雅妮何淑怡李佳德薛思玮苏智斌孙家涛彭海琳郭建东朱学涛 Beijing National laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences Center for nanochemistry Beijing Science and Engineering Center for NanocarbonsBeijing National Laboratory for Molecular SciencesCollege of Chemistry and Molecular EngineeringPeking University Beijing Graphene Institute School of Integrated Circuits and Electronics MIIT Key Laboratory for Low-Dimensional Quantum Structure and DevicesBeijing Institute of Technology Department of Physics Fuzhou University

Topological physics has evolved from its initial focus on fermionic systems to the exploration of bosonic systems, particularly phononic excitations in crystalline materials. Two-dimensional(2D) topological phonons em...

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Movement of Dirac points and band gaps in graphyne under rotating strain

引用

Nano Research 2017年第6期10卷 2005-2020页

作者： Zhenzhu Li Zhongfan Liu Zhirong Liu College of Chemistry and Molecular Engineering Center for Nanochemistry State Key Laboratory for Structure Chemistry of Unstableand Stable Species and Beijing National Laboratory for Molecular Sciences (BNLMS) Peking University Beijing 100871 China

The introduction of lattice anisotropy causes Dirac cones to shift in response to the applied strain, leaving a pseudogap at the original Dirac points. Here, a group-theory analysis is combined with first-principles calculations to reveal the movement characteristics of Dirac points and band gaps in various graphynes under rotating uniaxial and shear strains. Graphene, where linear effects dominate, is different from α-,β-, and γ-graphynes, which generate strong nonlinear responses due to their bendable acetylenic linkages. However, the linear components of the electronic response, which are essential in determining material performance such as intrinsic carrier mobility due to electron-phonon coupling, can be readily separated, and are well described by a unified theory. The movement of the Dirac points in α-graphyne is circular under a rotating strain, and the pseudogap opening is isotropic with a magnitude of only 2% that in graphene. In comparison, the movement in β-graphyne is elliptical and the center is displaced from the origin. For γ-graphyne, three branches of gaps change with the applied strains with a sine/cosine dependence on the strain angle. The developed methodology is useful in determining the electronic response to various strains of Dirac materials and two-dimensional semiconductors,

关键词： graphene graphyne Dirac point band gap first-principles strain effect

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Silica nanoparticle with a single His-tag for addressable functionalization, reversible assembly, and recycling

引用

Nano Research 2018年第5期11卷 2512-2522页

作者： Yuye Cao Yangdong Cui Yu Yang Jie Hua Zheng-Mei song Haifang Wang Yuanfang Liu Aoneng Cao Institute of nanochemistry and Nanobiology Shanghai University Shanghai 200444 China Beijing National laboratory for Molecular Sciences College of Chemistry and Molecular Engineering Peking University Beijing 100871 China

For many biomedical and catalytic applications, such as encapsulation of proteins/enzymes in nanopartides （NPs）, it is preferable to have well-dispersed small NPs that are stable in solution and behave quasi-homogeneously. However, conventional liquid phase methods for small-NP synthesis and functionalization usually face great difficulties in separation/purification and recycling. In addition, controlling the orientation of proteins inside NPs is also a crucial issue to maximize the activity of the encapsulated proteins. Herein, we report a solid phase method to solve these problems. Using His-tagged proteins as cores, well-dispersed core-sheU silica NPs are facilely synthesized and functionalized in a column. The core His-tagged proteins are kept bound on the surface of the resIn beads in the column during the entire process, making the separation/purification of NPs and their precursors during the multiple-step process as simple as a few-minutes procedure of draining and washing the column. Each obtained silica NP has an adjustable eccentric core-shell structure with only one His-tag sticking out of the particle. This single His-tag on the surface of each NP not only makes it easy for addressable and stoichiometric functionalization of the NP but also provides an easy way to reversibly assemble NPs into dimers or be oriented on the surface of large particles. Notably, this solid phase approach also provides a versatile means to control the orientation of proteins inside NPs, and the His-tag makes it easy to recycle those well-dispersed small NPs.

关键词： His-tagged nanoparticle solid phase reversible assembly addressable functionalization protein orientation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Synthesis and characterization of boron nitride sponges as a novel support for metal nanoparticles

引用

Science China Chemistry 2008年第3期51卷 205-210页

作者： ZHENG MingTao LIU YingLiang GU YunLe XU ZiLin Department of Chemistry and Institute of nanochemistry Jinan UniversityGuangzhou 510632China

This paper describes a simple synthetic route for the synthesis of hexagonal boron nitride (h-BN) powders with high specific surface area, in which BBr3, NH4Cl and Al powders are used as starting materials. The structure and composition of the powders were characterized by electron diffraction, Fourier transformation infrared spectroscopy and X-ray photoelectron spectroscopy in the selected area. X-ray diffraction shows wide peaks of crystalline h-BN with the particle size on the nanometer scale, and transmission electron microscopy reveals that the products have a novel spongy morphology. Silver nanoparticles loaded h-BN sponges were prepared via a one-step synthesis method. Different reaction conditions for the formation of h-BN sponges were also investigated.

关键词： boron nitride synthesis characterization catalyst supports

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synthesis of Star Polymeric Ionic Liquids and Use as the Stabilizers for High Internal Phase Emulsions

引用

Chinese Journal of Polymer Science 2017年第1期35卷 54-65页

作者： qi-jing chen 安泽胜 Institute of nanochemistry and Nanobiology College of Environmental and Chemical Engineering Shanghai University Shanghai 200444 China

A series of well-defined core cross-linked star （CCS） polymeric ionic liquids （PILs） were synthesized via a three- step approach. First, the styrenic imidazole-based CCS polymer （S-PVBnIm） was prepared by the RAFT-mediated heterogeneous polymerization in a water/ethanol solution, followed by the quaternization of S-PVBnIm with bromoalkanes and anion exchange. The CCS polymers were characterized by gel permeation chromatography （GPC）, nuclear magnetic resonance （NMR） spectroscopy, Fourier transform infrared spectroscopy （FTIR）, thermal gravimetric analysis （TGA）, and differential scanning calorimetry （DSC）. The obtained CCS polymers were used as the effective emulsifiers for oil-in-water high internal phase emulsions （HIPEs）. Multiple oils with different polarity including n-dodecane, undecanol, toluene and octanol were emulsified using 0.5 wt% S-PVBnIm aqueous solution under the acidic condition to form HIPEs with long-term stabilities. The excellent emulsification properties of CCS PILs were demonstrated by HIPE formation for a variety of oils. The properties of HIPEs in terms of emulsion type and oil droplet size were characterized by the confocal laser scanning microscopy （CLSM）. The intriguing capability of CCS PILs to stabilize HIPEs of various oils holds great potentials for the practical applications.

关键词： Star polymers Poly(ionic liquids) Emulsions

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Study of electronic structures and absorption bands of BaMgF_4 crystal with F colour centre

引用

Chinese Physics B 2011年第4期20卷 404-407页

作者：康玲玲刘廷禹张启仁徐灵芝张飞武 College of Science University of Shanghai for Science and Technology nanochemistry Research Institute Curtin University

The electronic structures of BaMgF4 crystals containing an F colour centre are studied within the framework of the fully relativistic self-consistent Direc-Slater theory, using a numerically discrete variational （DV-Xa） method. It is concluded from the calculated results that the energy levels of the F colour centre are located in the forbidden band. The optical transition energy from the ground state to the excited state for the F colour centre is about 5.12 eV, which corresponds to the 242-nm absorption band. These calculated results can explain the origin of the absorption bands.

关键词： electronic structures F-type colour centre DV-Xa (numerically discrete variational method) BaMgF4 crystal

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Yolk-shell Si/C composites with multiple Si nanoparticles encapsulated into double carbon shells as lithium-ion battery anodes

引用

Journal of Energy Chemistry 2019年第5期28卷 124-130页

作者： Le Hu Bin Luo Chenghao Wu Pengfei Hu Lianzhou Wang Haijiao Zhang Institute of nanochemistry and Nanobiology Shanghai UniversityShanghai 200444China Australian Institute for Bioengineering and Nanotechnology The University of QueenslandBrisbaneQLD 4072Australia laboratory of Microstructure Shanghai UniversityShanghai 200444China

The conceptual design of yolk-shell structured Si/C composites is considered to be an effective way to improve the recyclability and conductivity of Si-based anode materials. Herein, a new type of yolk-shell structured Si/C composite (denoted as TSC-PDA-B) has been intelligently designed by rational engineering and precise control. In the novel structure, the multiple Si nanoparticles with small size are successfully encapsulated into the porous carbon shells with double layers benefiting from the strong etching effect of HF. The TSC-PDA-B product prepared is evaluated as anode materials for lithium-ion batteries (LIBs). The TSC-PDA-B product exhibits an excellent lithium storage performance with a high initial capacity of 2108 mAh g^-1 at a current density of 100 mA g^-1 and superior cycling performance of 1113 mAh g^-1 over 200 cycles. The enhancement of lithium storage performance may be attributed to the construction of hybrid structure including small Si nanoparticles, high surface area, and double carbon shells, which can not only increase electrical conductiv让y and intimate electrical contact with Si nanoparticles, but also provide built-in buffer voids for Si nanoparticles to expand freely without damaging the carbon layer. The present findings can provide some scientific insights into the design and the application of advanced Si-based anode materials in energy storage fields.

关键词： Si/C composites Yolk-shell Multiple Si nanoparticles Double carbon shells Energy storage

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：