检索结果-南通市图书馆

Organic semiconductor nanostructures:optoelectronic properties,modification strategies,and photocatalytic applications

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2022年第18期113卷 175-198页

作者： Jiaqi Dong Chuxuan Yan Yingzhi Chen Wenjie Zhou Yu Peng Yue Zhang Lu-Ning Wang Zheng-Hong Huang School of Materials Science and Engineering University of Science and Technology BeijingBeijing100083China Shunde Graduate School of University of Science and Technology Beijing Foshan528399China Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing100084China

Organic semiconductors(OSCs)possess diverse chemical structures and tailored optoelectronic properties via simple chemical modifications,so increasing use of them are found in efficient visible-light ***,the weak chemical bonds and the poor charge behavior(e.g.,low concentration of free charge carriers,low carrier mobility)intrinsic in them,always incur quite limited stability and ***,the assembly of them into refined nanostructures or nanocomposites is usually proposed to enhance their optoelectronic properties,as well as the photocatalytic efficiency and ***-dimensional(0D)nanoparticles are low in size and hence high specific surface area(SSA);One-dimensional(1D)nanostructures are usually arranged in an orderly long range thus leading to low surface defect density and increased carrier mobility;Two-dimensional(2D)nanostructures are particularly capa-ble of enhancing the photogenerated charge utilization because of their large reaction sites and shortened charge transport ***,the building of heterogeneous interfaces in the nanocomposites can effectively facilitate the special charge *** these highlight the importance of organic nanos-tructures in improving the photocatalytic activity and ***,organic semiconductor nanostructures(OSNs)have been increasingly used in the photocatalytic water splitting into H_(2) and O_(2),CO_(2) reduction,pollutant decomposition,disinfection,*** this review,we first examine the important optoelectronic properties of OSNs that govern the photocatalytic processes;we then analyze different classes of OSNs and their mechanistic pathways,with an emphasis on the structure-property relationships;we also introduced various photocatalytic applications of OSNs;we lastly propose the challenges and future outlook in real use.

关键词： Organic semiconductors nanostructures Optoelectronic properties Photocatalysis

Controllable growth of low-dimensional nanostructures on well-defined surfaces

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2013年第9期22卷 120-134页

作者：秦志辉 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsChinese Academy of Sciences

The controllable growth of nanostructures with desired geometric order and well-defined shapes has stimulated great interest due to its applicability in the development of microelectronic devices. Self-assembly is an efficient and versatile way to guide the atoms or molecules into low-dimensional nanostructures as a consequence of balancing complex interplay between adsorbate-adsorbate and adsorbate-substrate interfacial interactions. The tailoring of low-dimensional nanostruc- tures by control of inter-adsorbate and adsorbate-substrate interfacial interactions is reviewed. Such inherent interactions greatly influence not only the size and shape of the growing nanostructures, but also their chemical identity. The degree of interaction between adsorbates can be controlled via preparation procedures, opening up the study of the influence of this phenomenon with respect to reactivity and catalytic behavior. The formation of well-defined molecular layers can be controlled not only by repulsive molecule-molecule interaction but also by symmetry matching or charge transfer be- tween adsorbed molecules and the substrate. It has become obvious that inter-adsorbate and adsorbate-substrate interfacial interactions can be tuned to fabricate diverse surface nanostructures from semiconductor, metallic, and molecular materials.

关键词： nanostructures self-assembly intermolecular interactions scanning tunneling microscopy

Flexible One-Dimensional nanostructures:A Review

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2015年第6期31卷 607-615页

作者： Bin Yuan Ludovico Cademartiri Department of Chemical & Biological Engineering Iowa State University of Science and Technology Department of Materials Science & Engineering Iowa State University of Science and Technology Ames Laboratory U.S. Department of Energy

This review discusses the recent reports on one-dimensional(1D) nanostructures with unusual *** discuss the importance that flexibility could have in future applications of nanowires and other nanostructures,and detail the two main approaches that have been followed to this day to synthesize highly flexible 1D *** approach is based on making crystals in which one or two dimensions of the structure are comparable in size with the unit *** thinness has been shown to provide unusual *** other approach conjoins hard nanostructures with flexible joints.

关键词： Flexibility One dimension nanostructures Methodolo

Composition optimized trimetallic PtNiRu dendritic nanostructures as I versatile and active electrocatalysts for alcohol oxidation

在线全文

学校读者我要写书评

暂无评论

Nano Research 2019年第3期12卷 651-657页

作者： Yan Lu Wei Wang Xiaowei Chen Yuhui Zhang Yanchen Han Yong Cheng Xue-Jiao Chen Kai Liu Yuanyuan Wang Qiaobao Zhang Shuifen Xie College of Materials Science and Engineering Huaqiao University Xiamen 361021 China Department of Physics Xiamen University Xiamen 361005 China Shenzhen Research Institute of Xiamen University Shenzhen 518000 China Department of Materials Science and Engineering Xiamen University Xiamen 361005 China

Platinum-based nano crystals are the most effective electrocatalysts for accelerati ng the chemical tran sformatio ns on the anode in direct alcohol fuel cells. To facilitate practical applications and overcome the drawbacks of diverse alcohols, it is significant to develop electrocatalysts with high activities and a wide fuel flexibility. Here, we demonstrate a practicable solution method for fabricating composition tun able trimetallic PtNiRu den dritic nano structures (DNSs) which can serve as versatile and active catalysts for electrooxidatio n of a variety of liquid alcohols. A series of trimetallic DNSs with tun able Pt/Ni/Ru atomic ratios were successfully syn thesized by simply adjusti ng the feeding of precursors. Detailed electrochemical test indicates that, among other compositions, the Pt66Ni27Ru7 DNSs present much superior electroactivity in catalyzing electrooxidation of liquid alcohols in acidic mediums. Specifically, the mass activity and specific activity on the Pt66Ni27Ru7 DNSs, for electrooxidation of methanol, ethanol, and ethylene glycol, are 4.57 and 4.34 times, 3.55 and 3.42 times, and 2.37 and 2.28 times that of the commercial Pt black, respectively. X-ray photoelectron spectroscopy and CO stripping studies reveal the adsorption of CO on these PtNiRu DNSs is much weaker than on pure Pt. Meanwhile, the surface Ru sites can provide neighbouring -OH groups to facilitate the oxidati on and removal of the adsorbed in termediates (-CO) on the surface Pt sites, effectively improvi ng the CO tolera nee of the catalysts. The PtNiRu DNSs also show effectively boosted capacity for breaking the C-C bond in C2-alcohols, showing great potential for fuel-flexible fuel cell applications.

关键词： platinum-based nanocrystals dendritic nanostructures fuel flexibility electrooxidation of alcohols CO toleranee

SELF-ASSEMBLING AMPHIPHILIC POLYELECTROLYTES AND THEIR nanostructures

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

Chinese Journal of Polymer Science 2000年第4期18卷 323-336页

作者： Yotaro Morishima Department of Macromolecular Science Graduate School of Science Osaka University Toyonaka Osaka 560-0043 Japan

The self-assembling behavior of random copolymers of sodium 2-(acrylamido)-2-methylpropanesulfonate (AMPS)and hydrophobic comonomers possessing dodecyl groups linked by various spacer bonds was discussed with a focus on theeffect of the spacer. The characterization of association behavior of such polymers in water using quasielastic light scattering,capillary electrophoresis, NMR relaxation, various fluorescence, and viscoelastic methods was described. These copolymersform a variety of self-assembled nanostructures depending on the type of the spacer. Random copolymers of AMPS and N-dodecylmethacrylamide show a strong preference for intrapolymer self-association even in concentrated aqueous solutionsforming single-macromolecular self-assemblies (unimolecular micelles). In contrast, random copolymers of AMPS anddodecyl methacrylate are prone to undergo interpolymer associations yielding multipolymer micelles. In random copolymersof AMPS and a methacrylate substituted a nonionic surfactant (HO(CH_2CH_2O)_(25)C_(12)H_(25)) (C_(12)E_(25)), dodecyl groups are muchless restricted by the polymer backbone because they are linked via a long, flexible hydrophilic spacer. Thus, the polymer-bound C_(12)E_(25) surfactant moieties form micelles similar to those formed by discrete surfactants, but they are bridged bypolymer chains forming a network structure.

关键词： Self-assemblies Hydrophobically-modified polyelectrolytes nanostructures Hydrophobic association Unimolecular micelles Multipolymer micelles Transient network Viscoelasticity Shear thickening Shear thinning

How does anodization time affect morphological and photocatalytic properties of iron oxide nanostructures?

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第3期38卷 159-169页

作者： Bianca Lucas-Granados Rita Sánchez-Tovar Ramón MFernández-Domene JoséMaría Estívalis-Martínez JoséGarcía-Antón Ingeniería Electroquímica y Corrosión(IEC).Instituto Universitario de Seguridad Industrial Radiofísica y Medioambiental(ISIRYM)Universitat Politècnica de ValènciaCamino de Vera s/n46022ValenciaSpain Departmento de Ingeniería Química Universitat de ValènciaAv de les Universitatss/n46100 BurjassotSpain

Iron oxide nanostructures are promising materials to be used as photocatalysts in different photoelectrochemical applications. There are different techniques in order to synthesize these nanostructures, but one of the most inexpensive and simple method is electrochemical anodization. This method can lead to different nanostructures by controlling its parameters. Anodization time is one of the most critical parameters since it considerably affects the properties of the obtained nanostructures. In this work, different anodization times(5, 10, 15, 30 and 60 min) were studied. The resulting nanotubes were characterized by field emission scanning electron microscopy, Raman laser confocal microscopy, water splitting measurements, Mott-Schottky analysis and electrochemical impedance spectroscopy, in order to test their viability for being used as photocatalysts in photoelectrochemical applications. Results showed that the best photocurrent density values in water splitting tests(0.263 m A m-2) were achieved for the sample anodized for 10 min under hydrodynamic conditions.

关键词： Iron oxide Metallic nanostructures Photoelectrochemistry Anodization Time

Ambipolar two-dimensional bismuth nanostructures in junction with bismuth oxychloride

在线全文

学校读者我要写书评

暂无评论

Nano Research 2021年第4期14卷 1103-1109页

作者： Xianzhong Yang Shengnan Lu Jun Peng Xiangchen Hu Nan Wu Congcong Wu Chao Zhang Yifan Huang Yi Yu Hung-Ta Wang School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China

Despite the unique properties of bismuth(Bi),there is a lack of two-dimensional(2D)heterostructures between Bi and other functional 2D ***,a coherent strategy is reported to simultaneously synthesize rhombohedral phase Bi nanoflakes and bismuth oxychloride(BiOCI)*** delicate balance between several reactions is mediated mainly for the reduction and chlorination in the chemical vapor transport(CVT)*** Bi-BiOCI lateral heterostructures have been constructed via the coalescence of the two different 2D *** characteristics of ambipolar conducting Bi and insulator-like BiOCI are elaborated by scanning microwave impedance microscopy(sMIM).This work demonstrates a way to construct a 2D Bi nanostructure in junction with its oxyhalide.

关键词： Bi ambipolar BiOCI chemical vapor transport nanostructures

A Review on Diverse Silver nanostructures

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

Journal of Materials Science & Technology 2010年第6期26卷 487-522页

作者： S.Vongehr National Laboratory of Solid State Microstructures Department of Materials Science and EngineeringNanjing University

This article reviews recent advances in the utilization of various water based synthesis routes towards the shape-controlled synthesis of silver nanoparticles and microstructures in a diverse range of shapes and sizes from several nanometers to micrometers. A variety of very simple one-pot methods, at times employing com- mercial microwave ovens, inexpensive low power ultrasound cleaners, or two-electrode electro-chemistry, can be surprisingly effective in the controlled synthesis of a wide range of nanostructured products, if only parameters are carefully chosen. Many approaches which are adopted include synthesis of Ag nanostructures with various shapes in solution, doping of Ag nanoparticles on unmodified silica and on/inside carbon spheres, kinetically controlled growth of Ag micro-particles with novel nanostructures on flat substrates, and galvanic replace- ment towards bimetallic Ag-Au dendrites and carbon composites. Characterizations of shape, composition and microstructure are carried out via scanning and transmission electron microscopy, various spectroscopy methods, N2 absorption measurements and suchlike. The involved growth mechanisms are investigated in order to discover new means towards better control. Size, location and shape control, including micro- and nanostructure features, allows tuning the products properties towards desired applications. We focus on the optical properties and catalytic activities, but also the stability of compounds can be an issue of interest.

关键词： Silver nanostructures Synthesis Thermal stability Surface plasmon resonance Catalysis

Self-assembly of metal-cholesterol oxidase hybrid nanostructures and application in bioconversion of steroids derivatives

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2021年第3期15卷 615-629页

作者： Yu Xin Qiuyue Gao Yu Gu Mengyao Hao Guangming Fan Liang Zhang Key Laboratory of Industry Biotechnology(Ministry of Education) School of BiotechnologyJiangnan UniversityWuxi 214122China National Engineering Laboratory for Cereal Fermentation Technology Jiangnan UniversityWuxi 214122China

A cholesterol oxidase(COD)was hybridized with Ca^(2+),Zn^(2+),Al^(3+),Fe^(2+) and Mn^(2+).After precipitation with PO_(4)^(3-) at 4℃ for 72 h,the resulting pellets were *** scanning electron microscopy assays,the metal-COD complexes revealed flower-like or granular structures after *** transform infrared spectroscopy assay revealed the characteristic peaks of both the enzyme and metal materials.X-ray diffraction analysis indicated that COD was encapsulated in CaHPO_(4)·2H_(2)O-,Zn_(3)(PO_(4))_(2)·4H_(2)O-,AlPO_(4-),FeP_(4-) and Mn_(3)(PO_(4))_(2)·3H_(2)O-based nanostructures,*** scanning calorimetry assay indicated significant increases in thermo-denaturation temperatures from 60.5℃ to 167.02℃,167.02℃,137.70℃,172.85℃ and 160.99℃,*** steroid derivatives as substrates,this enzyme could convert cholesterol,pregnenolone,dehydroepiandrosterone,ergosterol,b-sitosterol and stigmasterol to related single *** in metal-based nanostructures could significantly enhance the initial conversion ratio and reaction stability of the *** addition,substrate selectivity could be affected by various metal ***,using Ca^(2+),Zn^(2+),Al^(3+),Fe^(2+) and Mn^(2+) as hybrid raw materials could help to encapsulate COD in related metal-enzyme nanostructures,and could help to promote the stability and tolerant properties of the enzyme,while also enhancing its catalytic characteristics.

关键词： cholesterol oxidase metal-enzyme hybridization nanostructures sterol derivatives bioconversion