An experimental investigation of microresistor laser printing with gold nanoparticle-laden inks

This paper presents an experimental investigation of the novel thermal manufacturing process of printing and laser curing of nanoparticle-laden inks that can produce functional microstructures such as electronic microresistors and interconnections for semiconductors and other devices. Of specific interest are the complex and interweaved transport phenomena involved, focusing on the absorption and diffusion processes of irradiated laser energy influencing solvent vaporization, the nanoparticle curing process, the substrate, and the final quality of the produced resistor. Parametric studies of the thermal process together with extensive microscopy analysis of the topography and resistivity measurements piece together a better understanding of the underlying physics and aid the development of the technolog

Hydrogen patterning of Ga1-xMnxAs for planar spintronics

We demonstrate two patterning techniques based on hydrogen passivation of Ga1-xMnxAs to produce isolated ferromagnetically active regions embedded uniformly in a paramagnetic, insulating host. The first method consists of selective hydrogenation of Ga1-xMnxAs by lithographic masking. Magnetotransport measurements of Hall-bars made in this manner display the characteristic properties of the hole-mediated ferromagnetic phase, which result from good pattern isolation. Arrays of Ga1-xMnxAs dots as small as 250 nm across have been realized by this process. The second process consists of blanket hydrogenation of Ga1-xMnxAs followed by local reactivation using confined low-power pulsed-laser annealing. Conductance imaging reveals local electrical reactivation of micrometer-sized regions that accompanies the restoration of ferromagnetism. The spatial resolution achievable with this method can potentially reach <100 nm by employing near-field laser processing. The high spatial resolution attainable by hydrogenation patterning enables the development of systems with novel functionalities such as lateral spin-injection as well as the exploration of magnetization dynamics in individual and coupled structures made from this novel class of semiconductors.Comment: ICDS-24, July 2007. 8 pages with 4 figure

광열/광음 기법에 의한 나노초 폭발적 기화 과정 분석

22kc

An experimental investigation of microresistor laser printing with gold nanoparticle-laden inks

ISSN:0947-8396ISSN:1432-0630ISSN:0340-379

In situ monitoring of laser cleaning by coupling a pulsed laser beam with a scanning electron microscope

Lasers have proved to be effective tools for material processing at the micron and nanometer scales. In particular, laser interaction with nanostructures offers the unique advantage of highly localized excitation and heating. In this study, a short-pulsed laser beam is coupled to a scanning electron microscope, without disturbing the microscopy function, in order to study in situ laser cleaning of individual submicron particles from a silicon substrate. The substrate conditions before and after particle removal were inspected by electron microscopy. The mechanisms of particle removal and the underlying dynamic coupling of the laser radiation associated with particle cleaning are investigated

Coordination of iPr2P(O)NHP(O)iPr 2 to Co(II): Simultaneous formation of octahedral and tetrahedral complexes

The reaction of iPr2P(O)NHP(O)iPr 2 with CoCl2 â̂™ 6H2O affords simultaneously the neutral tetrahedral [Co[iPr2P(O)NHP(O) iPr2-O,O′]Cl2] and the ionic octahedral [Co[iPr2P(O)NHP(O)iPr2-O,O′] 3][CoCl4] complexes. These Co(II) complexes, which are stable towards oxidation to Co(III) species, self-assemble via N-H···Cl hydrogen bonds into a &quot;honeycomb&quot; (6,3) network. The structural flexibility of iPr2P(O) NHP(O)iPr2 that can accommodate both tetrahedral and octahedral geometries is discussed. © 2013 Elsevier B.V