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Fluorescence spectra of colloidal self-assembled CdSe nano-wire on substrate of porous Al2O3/Au nanoparticles

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Chinese Physics B 2019年第6期28卷 429-432页

作者：张欣邵丽萍彭嫚白忠臣张正平秦水介 College of Big Data and Information Engineering Guizhou UniversityGuiyang 550025China College of Medicine Guizhou UniversityGuiyang 550025China Guizhou Province Key Laboratory for Photoelectric Technology and Application Guizhou UniversityGuiyang 550025China

We present a self-assembly method to prepare array nano-wires of colloidal CdSe quantum dots on a substrate of porous Al2 O3 film modified by gold nanoparticles. The photoluminescence(PL) spectra of nanowires are in situ measured by using a scanning near-field optical microscopy(SNOM) probe tip with 100-nm aperture on the scanning near-field optical microscope. The results show that the binding sites from the edge of porous Al2 O3 nanopores are combined with the carboxyl of CdSe quantum dots’ surface to form an array of CdSe nanowires in the process of losing background solvent because of the gold nanoparticles filling the nano-holes of porous Al2 O3 film. Compared with the area of nonself-assembled nano-wire, the fluorescence on the Al2 O3/Au/CdSe interface is significantly enhanced in the self-assembly nano-wire regions due to the electron transfer conductor effect of the gold nanoparticles’ surface. In addition, its full width at half maximum(FWHM) is also obviously widened. The method of enhancing fluorescence and energy transfer can widely be applied to photodetector, photocatalysis, optical display, optical sensing, and biomedical imaging, and so on.

关键词： enhanced photoluminescence Cd Se nano-wire colloidal self-assembled method porous Al2O3 film

Improvement of Performance of HfS_2 Transistors Using a self-assembled Monolayer as Gate Dielectric

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Chinese Physics Letters 2019年第6期36卷 57-60页

作者：张文伦 Department of Electrical and Electronic Engineering Tokyo Institute of Technology

This work details a study based on HfS_(2 )transistors utilizing an n-octadecylphosphonic acid-based self-assembled monolayer(SAM)as the gate dielectric.The fabrication of the SAM-based two-dimensional(2D)material transistor is simple and can be used to improve the quality of the interface of air-sensitive 2D materials.In comparison to HfS_(2) transistors utilizing a conventional Al_2O_(3) gate insulator by atomic layer deposition,HfS_(2) transistors utilizing an SAM as the gate dielectric can reduce the operation region from 4 V to 2 V,enhance the field-effect mobility from 0.03 cm^2/Vs to 0.75 cm^2/Vs,improve the sub-threshold swing from 404 m V/dec to 156 m V/dec,and optimize the hysteresis to 0.03 V,thus demonstrating improved quality of the semiconductor/insulator interface.

关键词： Performance HfS2 self-assembled Monolayer Gate Dielectric

self-assembled QUANTUM DOTS ON AU AND THE INTERFACE FLUORESCENCE

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Journal of Innovative Optical Health Sciences 2010年第4期3卷 315-320页

作者： QIAO XU LEI BAO YI LIN HAI-QIAO WANG ZHI-LIN ZHANG YUAN-DI ZHAO College of Life Science and Technology Huazhong University of Science and Technology Wuhan Hubei 430074PR China College of Chemistry and Molecular Sciences and State Key Laboratory of Virology Wuhan University Wuhan Hubei 430072PR China

In this paper,amino capped CdSe/ZnS quantum dots(QDs)were immobilized on the 11-mercaptoundecanoic acid(MUA)self-assembled Au surface(SAM/Au)by 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride(EDC).Atomic force microscopy(AFM),fluorescence imaging and electrochemistry were employed to characterize the surface.The results showed that CdSe/ZnS QDs were immobilized on the surface of SAM/Au successfully.Based on this method,the fluorescence of the QDs on the SAM/Au was monitored on-line.

关键词： self-assembled quantum dots interface fluorescence

5-Fluorouracil-loaded self-assembled pH-sensitive Nanoparticles as Novel Drug Carrier for Treatment of Malignant Tumors

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Chinese Journal of Chemical Engineering 2006年第3期14卷 377-382页

作者：刘亮晋平程明张国亮张凤宝 School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China

In order to improve the cancer-targeting and selective activity of antineoplastic agent [5-fluorouracil (5-FU)], a novel pH-responsive drug delivery system [pullulan acetate/sulfonamide (PA/SDM) conjugate] was synthesized by a diafiltration method. Sulfonamide was grafted to the hydrophobically modified pullulan acetate to enhance the pH sensitivity for better cancer-targeting delivery. 5-FU was loaded into the self-assembled nanoparticles by the same method. The drug-loaded self-assembled nanoparticles were successfully obtained and characterized in terms of particle size, morphology and drug loading and release profile at various pHs. The results showed that the mean diameter of the self-assembled particles was approximately 100nm, with uniform size and good spherical morphology. The nanoparticles showed good stability at pH 7.4, which is equal to that of the normal body fluid, but shrank and aggregated below pH 6.8, which is close to the pH with tumors. The loading efficiency and concentration of released 5-FU was monitored at 269 nm on the UV/Vis spectrophotometer. The release profile was heavily pH-dependent around physiological pH, and the release rate was significantly enhanced under pH of 6.8.

关键词： 5-fluorouracil self-assembled nanoparticles pH sensitivity drug delivery pullulan

Rheological Properties and self-assembled Structures of Newly Synthesized Amide Organogelators, Butane 1,2,3,4-Tetracarboxamides, in Isododecane

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Advances in Materials Physics and Chemistry 2014年第12期4卷 267-274页

作者： Yuichi Sakanishi Taisuke Arita Mami Itoh Takashi Saeki R & D Center Organic Chemical Products Company DAICEL Corporation Ohtake Japan Graduate School of Science and Engineering Yamaguchi University Ube Japan

The objectives of this study were to develop organogelators suitable for industrial use and to probe the viscosity-increasing mechanisms of such organic compounds. Butane 1,2,3,4-tetracar-boxamides, new organogelators that each has four chemical side chains, were synthesized. Two oleyl groups, each with another two side chains that varied from C4 to C18, were introduced to control the solubility and crystallinity of the compounds, and their solubility and rheological properties in isododecane were evaluated. The rheological properties of different amide compounds, N,N’,N’’,N’’’-1,2,4,5-tetra alkyl/alkenyl pyromellitamides with the same four chemical side chains, were also obtained to consider the skeleton’s effect on self-assembled structures due to hydrogen bonding among amide groups. The viscosity-increasing mechanism of the compounds was discussed through linkage of the molecular design, rheological evaluation, and morphological observations in this paper.

关键词： Organic Compounds Chemical Synthesis Viscoelastic Property Transmission Electron Microscope (TEM) self-assembled Structure

Structure of self-assembled monolayer of NPAN on Au(111) electrode

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Chinese Science Bulletin 2003年第18期48卷 1952-1955页

作者： YANG Guangzheng ZENG Qingdao WAN Lijun BAI Chunli Institute of Chemistry Chinese Academy of Sciences(CAS)Beijing 100080China Graduate School of CAS Beijing 100080China

Adsorption of 4-(4-nitrophenylazo)-1-naphthol (NPAN), an azobenzene derivative, on Au(111) has been in-vestigated in aqueous HClO4 solution by using the cyclic voltammetry and scanning tunneling microscopy (STM). The molecule is found to form a stable monolayer on the elec-trode with a (6×4) structure relative to the underlying Au(111) lattice. Cyclic voltammograms show that the redox reactions occurring on the electrode are retarded by the formation of the monolayer. A structural model is proposed for the two-dimensional adlayer.

关键词： Au(111) azobenzene self-assembled monolayer STM.

Multi-component self-assembled anti-tumornano-vaccines based on MUC1 glycopeptides

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Multi-component self-assembled anti-tumornano-vaccines based...

Magnetic Films on self-assembled Nanospheres

第二届糖合成化学青年学术研讨会

作者：张伯斗李艳梅清华大学

The tumor-associated mucin MUC1 is a membrane glycoprotein expressed on almost all types of epithelial tumor tissues. We conjugated synthetic MUC1 glycopeptides bearing tumor-associated carbohydrate antigens at serine 15 and threonine 9 of the tandem repeat sequence to bovine serum albumin. These vaccines were administered to mice in form of a liposome and gave strong immune responses.1] Herein, we designed multicomponent self-assembled nanovaccines based on the strategy of the electrostatic interaction. We chose PamCSK and CpG as immunostimulants. A four component vaccine containing PamCSK, CpG, a MUC1 glycopeptide and an extra helper T-cell epitope could induce robust antibody immune responses and antitumor immune responses in vivo. With the facile preparation and the commendable immune effects, our strategy provides a promising way for the development of antitumor vaccines2].

关键词： vaccine tumor Pam3CSK4 CpG MUC1 T-cell epitope self-assembled

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复旦学报（自然科学版） 2007年第5期46卷 709-710页

作者： T.Ulbrich I.Guhr T.Schrefl O.Hellwig S.van Dijken M.Albrecht Department of Physics University of Konstanz Department of Engineering Materials University of SheffieldS1 3JD SheffieldUnited Kingdom Hitachi San Jose Research Center VTT Micro and Nanoelectronics

1 Results Nanoparticle media using arrays of monodisperse nanoparticles with high magneticanisotropy are assumed to be the ideal future magnetic recording media. However,key requirements like control of the magnetic anisotropy orientation along with magnetic domain isolation have not been achieved so far. Here, we report on a combination of a two-dimensional topographic pattern formed of self-assembled nanoparticles with sizes as small as 20 nm and magnetic multilayer film deposition[1]. The so formed n...

关键词： magnetic film self-assembled nanospheres

Hybrid Materials Prepared from Polymers and self-assembled Systems by Physical Processes

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复旦学报（自然科学版） 2007年第5期46卷 645-646页

作者： Jean-Michel Guenet Institut Charles Sadron CNRS UPR22 BP 400166 rue BoussingaultF-67083 STRASBOURG CedexFrance

1 Results A new type of hybrid materails prepared from ternary systems polymer/bicopper organic complex/solvent is presented.Each binary system displays differing types of behaviour: The polymer solutions produce thermoreversible gels while the bicopper organic complex (designated as CuS8) forms randomly-dispersed,self-assembling threads in organic solvents (See Fig.1(a),(b)).Fig.1 The CuS8 and ips thermoreversible gels Thermoreversible gels possess a fibrillar morphology with a typical mesh size ra...

关键词： Rybrid mate rials self-assembled CuS8