Nano Particles and Molecules – TechConnect Briefs

Structural and Morphological Transformations in Self-Assembled Sn Quantum Dots in Si Matrix

Moeck P., Lei Y., Topuria T., Browning N.D., Ragan R., Min K.S., Atwater H.A., Portland State University, US

Transmission electron microcopy (TEM) in both the parallel illumination and scanning probe mode (i.e. STEM) has revealed morphological and structural transformations in self-assembled II-VI, III-V and group IV semiconductor quantum dots (QDs). These transformations result [...]

Noise Spectroscopy of a Single Spin with Spin Polarized STM

Nussinov Z., Crommie M., Balatsky A.V., Los Alamos National Laboratory, US

We propose a mechanism for detection of a single spin center on a non-magnetic substrate. In the detection scheme, the STM tunnel current is correlated with the spin orientation. In the presence of magnetic field, [...]

Characterization of Core/Shell Nanoparticles by X-Ray Absorption Spectroscopy

Calvin S., Carpenter E.E., Stroud R.M., Harris V.G., Naval Research Laboratory, US

X-ray absorption spectra of nanoparticles with iron cores and oxide shells, synthesized using the reverse micellar method, were collected at the National Synchrotron Light Source. Comparison of the x-ray absorption near edge structure (XANES) to [...]

Transfer of Atoms Between Condensates by Raman Transitions

Paranjape V.V., Panat P.V., Lawande S.V., Lakehead University, CA

Law and Bigelow (Phys.Rev. A58,4791,1998) have proposed a scheme for amplifying an atomic beam as it interacts with a confined alkali-atom condensate. In this scheme the condensate acts as a source for increasing the intensity [...]

A Scheme for Electrical Detection of Single Electron Spin Resonance

Martin I., Mozyrsky D., Jiang H.W., Los Alamos National Laboratory, US

We study a scheme for electrical detection of the spin resonance (ESR) of a single electron trapped near a Field Effect Transistor (FET) conduction channel. In this scheme, the resonant Rabi oscillations of the trapped [...]

Gas-phase Production of Monodisperse Ferroelectric Nanoparticles

Seol K.S., Tomita S., Takeuchi K., Katagiri T., Miyagawa T., Ohki Y., RIKEN, JP

Laser ablative technology was used to prepare monodisperse nanoparticles (4-20 nm in diameter) of lead zirconate titanate (PZT). Laser ablation of a PZT ceramic target in oxygen ambience produced amorphous and irregularly-shaped PZT nanoparticles. A [...]

Criterion for Electrostatic Detachment of an Adhering Microparticle

Saito S., Himeno H., Takahashi K., Onzawa T., Tokyo Institute of Technology, JP

During micromanipulation, the influence of gravitational force becomes extremely small. The adhesional force is more significant for smaller objects. An adhered object can be detached by electrostatic interaction. In our earlier study, the electrostatic force [...]

Massively Parallel Simulation on Large-Scale Carbon Nanotubes

Tejima S., Berber S., Minami K., Jimbo N., Namamura H., Kanada Y., Tomanek D., Research Organization for Information Science & Technology, JP

Carbon nanotubes and fullerene have a lot of applicability for industries as nanotechnology. In order to extend its applicability, the computational simulation would be powerful and effective tools for finding and creating new materials and [...]

Increase the Synthesis Efficiency of Graphite Encapsulated Cobalt Nanoparticles by Annealing

Teng M.H., Lin C.C., National Taiwan University, TW

Graphite/carbon encapsulated metal (GEM) nanoparticles (Fig.1) not only provides an opportunity to study dimensionally confined systems, but also could be used in many nanotechnology applications, e.g. recording media, nano-sized wheel bearings, etc. Unlike other metal [...]

Synthesis of Magnetic Nanocomposite Gels for Ophthalmic Applications

Haik Y., Chatterjee J., Chen C-J., Biomagnetic Engineering Lab, Tallahassee, US

Retinal detachment is estimated to cause 150,000 (in the United States alone) to be blind every year. Many detached retinas occur in older people. It occurs when the vitreous gel that adheres to retina shrinks [...]

Templated Growth of Single Walled Carbon Nanotubes by CO Disproportionation on Cobalt Incorporated MCM-41

Ciuparu D., Lim S., Chen Y., Dobek F., Harding D., Haller G., Pfefferle L., Yale University, US

Single-walled carbon naotubes of uniform size were produced inside the pore system of cobalt substituted MCM41 mesoporous molecular sieve. Proof of concept has been achieved and preliminary results are reported.

Tunneling Spectrum of Single-Spin Oscillations

Bulaevskii L.N., Hruska M., Ortiz G., Los Alamos National Laboratory, US

We consider tunneling between electrodes via a microscopic system which can be modeled by the two-level Hamiltonian (a localized spin 1/2 probed by STM or a quantum dot). Measurements of the tunneling current I(t) in [...]

Photoluminescence and Photoluminescence Excitation Measurements of Eu-Doped Nano-Si/SiO2 Thin Films

Nery G.A., Fonseca L.F., Liu H., Resto O., Weisz S.Z., University of Puerto Rico at Rio Piedras, PR

Europium (Eu) ions are already used in significant visual technological applications. We attempted to determine if a silicon nanoparticle (nano-Si) / Europium interaction could occur. The energy transfer from nano-Si to rare earth ions has [...]

Raman Spectroscopy Study of SOx Species Adsorbed on Au Nanocluster Surfaces

Posada B., Mercado L., Hernandez S., Castro M., Castro W., Murillo L., Briano J., Irizarry R., Ishikawa Y., Castro M., Castro W., The University of Puerto Rico at Mayaguez, US

The reduction of Au3+ with SO3-2 is known to lead to the formation of gold nanoculsters and SO4-2 : n Au3+ + SO3-2 à + Aun + SO4-2 equation 1 This reaction is fundamental in [...]

Effect of Palladium Size on its Chemical Activity

Huang C-D., Huang S.Y., Huang C-D., Huang S.Y., Chang B-T., Yeh C.T., National Tsing Hua University, TW

Palladium crystallites with size down to d < 1 nm or were successfully dispersed on silica support and characterized with TEM. A process of hydrogen absorption into the dispersed crystallites were studied by a simultaneous [...]

Compositional Inhomogeneity of Pd70Ag30 Alloy Nanoparticles

Wang K-W, Chung S-R, Jang L-Y, Lee J-F, Perng T.P., National Tsing Hua University, TW

The compositional inhomogeneity of Pd70Ag30 nanoparticles with the size of 6-7nm was studied by X-ray absorption near edge structure (XANES). The composition of the as-prepared nanoparticles by chemical reduction is inhomogeneous across the diameter due [...]

Size-control and Size-selection at the Nanosize Level: Production of CoFe2O4 nanoparticles of unusual high coercivity at room temperature

Chinnasamy C.N., Jeyadevan B., Perales-Perez O., Shinoda K., Tohji K., Kasuya A., University of Puerto Rico, PR

Here, we introduce a solution chemistry technique which involves a `seeding step` under conditions where nucleation and growth rates of particles are controlled to produce single domain well-crystallized CoFe2O4 nanoparticles followed by a size-selective separation [...]

Data Acquisition System for Quality Tests of the ATLAS Muon Endcap Trigger Chambers

Wasilewski J., Napieralski A., Kulesza Z., Technical University of Lodz, PL

The ATLAS Collaboration is building a general-purpose pp detector which is design to exploit the full discovery potential of the high energy proton-proton interaction Large Hadron Collider (LHC) at CERN. The LHC offers a large [...]

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