Nano Particles and Molecules – TechConnect Briefs

Structure Determination of Small Metal Clusters by Density-Functional Theory and Comparison with Experimental Far-Infrared Spectra

Ratsch C., Fielicke A., Behler J., Scheffler M., von Helden G., Meijer G., University of California, Los Angeles, US

The far-infrared vibrational spectra for charged vanadium clusters as well as charged and neutral niobium clusters have been measured size specifically using farinfrared multiple photon dissociation. The ground state energy and vibrational spectra of a [...]

Exploring the Structure-Function Relationship in Multifunctional Nanoparticles

Casey P.S., Roussow C.R., Boskovic S., Lawrence K.A., Turney T.W., CSIRO (CMIT), AU

Nanoparticles of ZnO are increasingly being used as a pigment and UV absorber in personal care products (e.g. sunscreens), coatings and paints, predominantly because their absorbance efficiency increases with decreasing particle size. However, whilst protection [...]

Synthesis of Y2O3:Eu Phosphor Nanoparticles by Flame Spray Pyrolysis

Qin X., Ju Y., Bernhard S., Yao N., Princeton University, US

Nanoscale Y2O3:Eu phosphor particles were synthesized by flame spray pyrolysis method and the effects of precursor solution and annealing treatment were discussed. The flame spray pyrolysis system consists of a spray generator, a coflow burner, [...]

Synthesis of Polymer-Coated Magnetic Nanoparticles

Dey T., O'Connor C.J., AMRI-UNO, US

ATRP approach was employed to synthesis polymer-coated magnetite nanoparticles and was therefore characterized by various methods. The challenge was to obtain a thin shell and particles in an unagglomerated state. Several factors were found to [...]

Characterization of Nanocrystalline PZT Synthesized via a Hydrothermal Method

Harada S., Dunn S., Cranfield University, UK

Nanoscale lead zirconate titanate (PZT) has the potential to become a key component in a myriad of emerging future applications. A sound knowledge of the underlying physical and chemical processes involved in the formation and [...]

Preparation of Functional LLDPE/LDPE/TiO2 Membranes

Wang X-Y, Wang X., Lee J-H., Wang X-Y, Wang X., Hong C-E, Chonbuk National University, KR

Nano-scaled TiO2 has now been used in polymer industry due to its promising properties in light catalyst and UV light shielding[1-3]. In the present paper, functional LLDPE/LDPE/TiO2 membranes were successfully manufactured. To solve the poor [...]

Vibrating Nanotube–based Nano Powder Production System

Akhatov I.S., Jang B.Z., Rastgaar Aagaah M., Schmidt D.R., Mitlyng A.S., Stewart M.B., Mahinfalah M., North Dakota State University, US

In this paper we present a new nano powder production method. Basic idea of this method is as follows: a nanotube being placed in a vapor atmosphere will provoke condensation of vapor on the tip [...]

Room-Temperature Synthesis and Characterization of Highly Monodisperse Transition Metal-Doped ZnO Nanocrystals

Singh S.P., Perales-Perez O., Tomar M.S., Parra-Palomino A., Ruiz-Mendoza A., University of Puerto Rico, PR

We present here the results of our current efforts on size-controlled synthesis of bare and Mn- and Co-doped ZnO nanocrystals. Stable suspensions of these materials were produced in ethanol solutions at room-temperature. XRD characterization of [...]

Low Temperature Synthesis of Nanosized Metal Oxides by a Supercritical Seed Enhanced Crystallization process (SSEC)

Jensen H., Joensen K.D., Iversen S.B., Søgaard E.G., Aalborg University, DK

A novel low temperature method has been developed to produce nanosized crystalline materials. The method, a Supercritical Seed Enhanced Crystallization (SSEC) process, was shown to lower the crystallization temperature for several metal oxides by a [...]

Surface-Enhanced Raman Scattering in Small Noble-Metal Nanoparticles

Pustovit V.N., Shahbazyan T.V., Jackson State University, US

We present a microscopic theory of quantum-size effects in surface-enhanced Raman scattering (SERS) from molecules adsorbed on small metal nanoparticles. In noble-metal nanoparticles, the confining potential has different effect on s-band and d-band electrons. Namely, [...]

Vibrational Modes of Metal Nanoshells

Kirakosyan A.S., Shahbazyan T.V., Jackson State University, US

We study coherent oscillations of radial breathing modes in metal nanoparticles with a dielectric core. Vibrational modes are impulsively excited by a rapid heating of the particle lattice that occurs after laser excitation, while the [...]

Optical Properties of Silicon Nanocrystals Embedded in SiO2 Matrix

Ding L., Chen T.P., Liu Y., Nanyang Technological University, SG

In this work, spectroscopic ellipsometry (SE), which is a nondestructive method, is employed to determine the optical constants (refractive index and extinction coefficient) and thus the dielectric functions of the isolated nc-Si with a mean [...]

Charge Trapping and Charge Decay in Silicon Nanocrystals

Ng C.Y., Ding L., Chen T.P., Nanyang Technological University, SG

For applications of silicon nanocrystals in memory device, it is necessary to understand the discharging behaviors of the nanocrystals as the data endurance in memory and decay constant are important parameters to be measured. In [...]

Synthesis of Antimony Oxide Nanoparticles by Thermal Oxidation

Xu C.H., Shi S.Q., Tang Q., The Hong Kong Polytechnic University, HK

Antimony (Sb) oxide can be used as catalyst, retardant, fining agent, and optical material. Recently, hydrous Sb oxide was found to have high proton conductivity, which is likely to be a promising humidity-sensing material. Oxide [...]

Direct Electrochemical Reduction of CuO Nano Particles to Cu Nano Particles in NaCl Solution

Hwang G-H, Han W-K, Hong S-J, Choi J.W., Kang S-G, Hanyang University, KR

Copper nanoparticles are widely used material. However many reactive metals are difficult to produce without complex and expensive procedures. For low cost and mass production, the electrochemical reduction is a convenient technique to manufacture metal [...]

Environmentally Friendly Pathways for Synthesis of Titanium Dioxide Nano-particles

Li H., Sunol A.K., Sunol S.G., Sunol A.K., Sunol S.G., University of South Florida, US

Titanium Dioxide is an important catalyst for oxidation of hazardous compounds in air and water particularly for photo-catalysis. Although it is traditionally used for photo-catalysis with UV light, when its energy band gap is reduced, [...]

Effect of Nano-architectural Control on Optical Loss in Electro-optic Polymers

Huang D., Parker T.C., Lumera Corporation, US

Polymer electro-optic (EO) devices show great promise for high-speed telecom data transmission, broadband radio frequency (RF) signal distribution, and high-speed data transfer within the next generation of microprocessors running at 20 GHz and above (i.e., [...]

Strain and Structure in Nanocrystals

Bae Y., Caflisch R.E., University of California, Los Angeles, US

Layered nanocrystals consist of a core of one material surrounded by a shell of a second material. Because of the small size of these systems, their atomic structure is epitaxial in many cases. Lattice mismatch [...]

Three-dimensional Structure of Nanocrystals from High-energy X-ray Diffraction and Atomic Pair Distribution Function Analysis

Petkov V., Central Michigan University, US

3-D, nanocrystal, high-energy, X-ray, diffraction, atomic pair, distribution function analysis

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