Design and Simulation of an Antenna-Coupled Microbolometer at 30 THz

Weproposeamodelofantenna-coupledmicrobolometertobeincludedinanarrayforreceivinganddetectinglongwaveinfrared (LWIR) electromagnetic radiation. The antenna is joined to microstrip bandpass filters thus forming a single metal structure to definetheoperationfrequencyband.Theantennaandmicrostripfiltersaremodeledinaluminumthinfilm.Themicrobolometer ismodeledwithsuperconductingniobium,alltogetheronasiliconnitridemembrane.Thesquaredpixelstructureisdesignedon asupportframeof2

Growth of vertically aligned ZnO nanorods using textured ZnO films

A hydrothermal method to grow vertical-aligned ZnO nanorod arrays on ZnO films obtained by atomic layer deposition (ALD) is presented. The growth of ZnO nanorods is studied as function of the crystallographic orientation of the ZnO films deposited on silicon (100) substrates. Different thicknesses of ZnO films around 40 to 180 nm were obtained and characterized before carrying out the growth process by hydrothermal methods. A textured ZnO layer with preferential direction in the normal c-axes is formed on substrates by the decomposition of diethylzinc to provide nucleation sites for vertical nanorod growth. Crystallographic orientation of the ZnO nanorods and ZnO-ALD films was determined by X-ray diffraction analysis. Composition, morphologies, length, size, and diameter of the nanorods were studied using a scanning electron microscope and energy dispersed x-ray spectroscopy analyses. In this work, it is demonstrated that crystallinity of the ZnO-ALD films plays an important role in the vertical-aligned ZnO nanorod growth. The nanorod arrays synthesized in solution had a diameter, length, density, and orientation desirable for a potential application as photosensitive materials in the manufacture of semiconductor-polymer solar cells

Defect structure in nanoalloys

The defect structure of bimetallic nanoparticles differs from that of particles made of a single atomic species. Using high resolution TEM imaging along with molecular dynamics simulations, it is possible to investigate the nature and features of these defects. The definition of a local order parameter allows one to locate regions with different kinds of stacking on the simulated nanoparticles and thus to make a direct comparison with the experimental observations

The Co–Au interface in bimetallic nanoparticles: a high resolution STEM study

We report the formation of Au/Co nanoparticles and their characterization by aberration (Cs) corrected scanning transmission electron microscopy (STEM). The nanoparticles were synthesized by inert gas condensation, forming initially core-shell and bimetallic crystals. However, after thermal treatment at normal atmospheric conditions, the Co nanoparticles changed their morphology into a fine layer forming a perfect interface with the gold. The ordering of the zone rich in Co presents a fcc arrangement matching the gold lattice. The atomic analysis on the interface and the comparison of the STEM images with numerical simulations corroborated the atomic substitution of gold by cobalt

Pb(core)/ZnO(shell) nanowires obtained by microwave-assisted method

In this study, Pb-filled ZnO nanowires [Pb(core)/ZnO(shell)] were synthesized by a simple and novel one-step vapor transport and condensation method by microwave-assisted decomposition of zinc ferrite. The synthesis was performed using a conventional oven at 1000 W and 5 min of treatment. After synthesis, a spongy white cottonlike material was obtained in the condensation zone of the reaction system. HRTEM analysis revealed that product consists of a Pb-(core) with (fcc) cubic structure that preferentially grows in the [111] direction and a hexagonal wurtzite ZnO-(Shell) that grows in the [001] direction. Nanowire length was more than 5 μm and a statistical analysis determined that the shell and core diameters were 21.00 ± 3.00 and 4.00 ± 1.00 nm, respectively. Experimental, structural details, and synthesis mechanism are discussed in this stud

Estructura de velocidades bajo el observatorio astronómico universitario Tlapiani de la Universidad Autónoma de Nuevo León

La estación ITCT instalada en el observatorio astronómico universitario Tlapiani de la Facultad de Ciencias Físico Matemáticas de la Universidad Autónoma de Nuevo León, forma parte de una red regional de monitoreo sismológico instalada por la Facultad de Ciencias de la Tierra. Por su ubicación privilegiada en el Cerro de Picachos, el observatorio astronómico ofrece además de la exploración del espacio, un sitio de roca para el estudio de la estructura interna de la Tierra, el monitoreo de la sismicidad local y la evaluación del peligro sísmico de los principales centros urbanos en el NE de México