Light-controlled self-assembly of semiconductor nanoparticles into twisted ribbons. 2010

Sudhanshu Srivastava, and Aaron Santos, and Kevin Critchley, and Ki-Sub Kim, and Paul Podsiadlo, and Kai Sun, and Jaebeom Lee, and Chuanlai Xu, and G Daniel Lilly, and Sharon C Glotzer, and Nicholas A Kotov
Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109, USA.

The collective properties of nanoparticles manifest in their ability to self-organize into complex microscale structures. Slow oxidation of tellurium ions in cadmium telluride (CdTe) nanoparticles results in the assembly of 1- to 4-micrometer-long flat ribbons made of several layers of individual cadmium sulfide (CdS)/CdTe nanocrystals. Twisting of the ribbons with an equal distribution of left and right helices was induced by illumination with visible light. The pitch lengths (250 to 1500 nanometers) varied with illumination dose, and the twisting was associated with the relief of mechanical shear stress in assembled ribbons caused by photooxidation of CdS. Unusual shapes of multiparticle assemblies, such as ellipsoidal clouds, dog-bone agglomerates, and ribbon bunches, were observed as intermediate stages. Computer simulations revealed that the balance between attraction and electrostatic repulsion determines the resulting geometry and dimensionality of the nanoparticle assemblies.

UI MeSH Term Description Entries
D008027 Light That portion of the electromagnetic spectrum in the visible, ultraviolet, and infrared range. Light, Visible,Photoradiation,Radiation, Visible,Visible Radiation,Photoradiations,Radiations, Visible,Visible Light,Visible Radiations
D008854 Microscopy, Electron Microscopy using an electron beam, instead of light, to visualize the sample, thereby allowing much greater magnification. The interactions of ELECTRONS with specimens are used to provide information about the fine structure of that specimen. In TRANSMISSION ELECTRON MICROSCOPY the reactions of the electrons that are transmitted through the specimen are imaged. In SCANNING ELECTRON MICROSCOPY an electron beam falls at a non-normal angle on the specimen and the image is derived from the reactions occurring above the plane of the specimen. Electron Microscopy
D010084 Oxidation-Reduction A chemical reaction in which an electron is transferred from one molecule to another. The electron-donating molecule is the reducing agent or reductant; the electron-accepting molecule is the oxidizing agent or oxidant. Reducing and oxidizing agents function as conjugate reductant-oxidant pairs or redox pairs (Lehninger, Principles of Biochemistry, 1982, p471). Redox,Oxidation Reduction
D003198 Computer Simulation Computer-based representation of physical systems and phenomena such as chemical processes. Computational Modeling,Computational Modelling,Computer Models,In silico Modeling,In silico Models,In silico Simulation,Models, Computer,Computerized Models,Computer Model,Computer Simulations,Computerized Model,In silico Model,Model, Computer,Model, Computerized,Model, In silico,Modeling, Computational,Modeling, In silico,Modelling, Computational,Simulation, Computer,Simulation, In silico,Simulations, Computer
D013052 Spectrometry, X-Ray Emission The spectrometric analysis of fluorescent X-RAYS, i.e. X-rays emitted after bombarding matter with high energy particles such as PROTONS; ELECTRONS; or higher energy X-rays. Identification of ELEMENTS by this technique is based on the specific type of X-rays that are emitted which are characteristic of the specific elements in the material being analyzed. The characteristic X-rays are distinguished and/or quantified by either wavelength dispersive or energy dispersive methods. Particle-Induced X-Ray Emission Spectrometry,Proton-Induced X-Ray Emission Spectrometry,Spectrometry, Particle-Induced X-Ray Emission,Spectrometry, Proton-Induced X-Ray Emission,Spectrometry, X-Ray Fluorescence,X-Ray Emission Spectrometry,X-Ray Emission Spectroscopy,X-Ray Fluorescence Spectrometry,Energy Dispersive X-Ray Fluorescence Spectrometry,Energy Dispersive X-Ray Fluorescence Spectroscopy,Energy Dispersive X-Ray Spectrometry,Energy Dispersive X-Ray Spectroscopy,Particle Induced X Ray Emission Spectrometry,Proton Induced X Ray Emission Spectrometry,Spectrometry, Particle Induced X Ray Emission,Spectrometry, Proton Induced X Ray Emission,Spectrometry, Xray Emission,Wavelength Dispersive X-Ray Fluorescence Spectrometry,Wavelength Dispersive X-Ray Fluorescence Spectroscopy,Wavelength Dispersive X-Ray Spectrometry,Wavelength Dispersive X-Ray Spectroscopy,X-Ray Fluorescence Spectroscopy,Xray Emission Spectroscopy,Emission Spectrometry, X-Ray,Emission Spectrometry, Xray,Emission Spectroscopy, X-Ray,Emission Spectroscopy, Xray,Energy Dispersive X Ray Fluorescence Spectrometry,Energy Dispersive X Ray Fluorescence Spectroscopy,Energy Dispersive X Ray Spectrometry,Energy Dispersive X Ray Spectroscopy,Fluorescence Spectrometry, X-Ray,Fluorescence Spectroscopy, X-Ray,Spectrometry, X Ray Emission,Spectrometry, X Ray Fluorescence,Spectroscopy, X-Ray Emission,Spectroscopy, X-Ray Fluorescence,Spectroscopy, Xray Emission,Wavelength Dispersive X Ray Fluorescence Spectrometry,Wavelength Dispersive X Ray Fluorescence Spectroscopy,Wavelength Dispersive X Ray Spectrometry,Wavelength Dispersive X Ray Spectroscopy,X Ray Emission Spectrometry,X Ray Emission Spectroscopy,X Ray Fluorescence Spectrometry,X Ray Fluorescence Spectroscopy,X-Ray Fluorescence Spectroscopies,Xray Emission Spectrometry
D013440 Sulfides Chemical groups containing the covalent sulfur bonds -S-. The sulfur atom can be bound to inorganic or organic moieties. Sulfide,Thioether,Thioethers,Sulfur Ethers,Ethers, Sulfur
D013691 Tellurium An element that is a member of the chalcogen family. It has the atomic symbol Te, atomic number 52, and atomic weight 127.60. It has been used as a coloring agent and in the manufacture of electrical equipment. Exposure may cause nausea, vomiting, and CNS depression.
D045663 Quantum Dots Nanometer sized fragments of semiconductor crystalline material which emit PHOTONS. The wavelength is based on the quantum confinement size of the dot. They can be embedded in MICROBEADS for high throughput ANALYTICAL CHEMISTRY TECHNIQUES. Nanocrystals, Semiconductor,Semiconductor Nanocrystals,Semiconductor Nanoparticles,Dot, Quantum,Dots, Quantum,Nanocrystal, Semiconductor,Nanoparticle, Semiconductor,Nanoparticles, Semiconductor,Quantum Dot,Semiconductor Nanocrystal,Semiconductor Nanoparticle
D053768 Metal Nanoparticles Nanoparticles produced from metals whose uses include biosensors, optics, and catalysts. In biomedical applications the particles frequently involve the noble metals, especially gold and silver. Metal Nanocrystals,Metallic Nanocrystals,Metallic Nanoparticles,Metal Nanocrystal,Metal Nanoparticle,Metallic Nanocrystal,Metallic Nanoparticle,Nanocrystal, Metal,Nanocrystal, Metallic,Nanocrystals, Metal,Nanocrystals, Metallic,Nanoparticle, Metal,Nanoparticle, Metallic,Nanoparticles, Metal,Nanoparticles, Metallic
D019187 Cadmium Compounds Inorganic compounds that contain cadmium as an integral part of the molecule. Compounds, Cadmium

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