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Infrared sensing devices rely on narrow band gap semiconductors grown by expensive and complicated methods such as molecular beam epitaxy and chemical vapor deposition. Colloidal quantum dots (CQDs) offer a low-cost alternative to detect infrared light. In this study, we have successfully demonstrated synthesis of HgTe quantum dots, which can absorb midwave infrared (MWIR) at room temperature. The...
A ZnO-nanowire photodetector was prepared using three-dimensional through silicon via (TSV) technology. The diameter and depth of the Si via were about 80 µm and 175 µm, respectively. Cu uniformly filled in each TSV, whose average resistance was about 1 mΩ. Upon illumination with UV light (= 330 nm), it was found that measured responsivities is 7.38×10−3 A/W for the 3D TSV ZnO nanowire photodetector...
Metal oxides have been shown to have wide ranging material, physical and chemical properties while 2D materials has it unique two-dimensional planar structure and in this review, we show that a hybrid composite utilizing carbon nanotubes are used as a base template, forming a hybrid core-shell type of nanostructure, effectively enhances and extends the range of applications. There are two unique properties...
In this work, the deposition of 3-nm dispersed Zinc-Oxide (ZnO) nanislands by thermal Atomic Layer Deposition (ALD) is demonstrated. The physical and electronic properties of the islands are studied using Atomic Force Microscopy, UV-Vis-NIR spectroscopy, and X-ray Photoelectron Spectroscopy. The results show that there is quantum confinement in 1D in the nanoislands which is manifested by the increase...
We have studied effects of deposition temperature on electrical properties of (ZnO)x(InN)1−x (ZION) films on ZnO templates. With increasing the deposition temperature from RT to 450°C, the electron mobility decreases from 93 cm2/Vs to 70 cm2/Vs and the carrier density increases from 1.8×1019 cm−3 to 3.4×1019 cm−3. Furthermore, we found a correlation between electrical properties and root mean square...
The nonlinear response of zinc oxide and zinc oxide-gold hybrid colloidal nanostructures to 532 nm nanosecond pulses was investigated. The z-scan technique was used to measure the nonlinear absorption of zinc oxide, zinc-oxide: gold hybrids and mixed colloids of zinc-oxide and gold. Despite similar zinc oxide concentrations, the colloids containing gold nanoparticles displayed stronger intensity dependent...
We demonstrated a novel inorganic/organic hybrid thin-film nanostructure composed by various ZnO nanostructures (Nanorods, Nanotips and Nanotubes) embedded in PMMA. The ZnO nanorods were growth on the substrate by a hydrothermal process. The ZnO nanotips and nanotubes were transformed from the nanorod via a chemical process. Finally, these ZnO nanostructures were embedded in PMMA. The seedback factor...
In this work, n-ZnO/p-CuxO and n-Cu:ZnO/n-Zn:CuO core-shell nanorod (NR) arrays were synthesized by depositing CuxO nanoshells with different thickness on surface of ZnO NRs and subsequent annealing. Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM) show the outer CuxO shells were comprised of Cu2O and CuO nanocrystals before annealing, but they transformed to single-crystalline...
Zinc oxide (ZnO) and Titanium dioxide (TiO2) nanoparticles are some of the widely used nanoparticles (NPs) in commercial industry. Thus the chances for the particles to get run off to the aquatic environment and to there by affect the aquatic life are very high. The present study evaluates the short term toxicity of ZnO NPs and TiO2 NPs on Chlorella pyrenoidosa, which is a fresh water algae and on...
Zinc oxide (ZnO) nanorods are grown by a hydrothermal method. The morphology was changed from nanorod to nanotube via a well-controlled chemical aqueous etching process with appropriate amount potassium chloride (KCl). SEM analyses show that the ZnO nanorods can be changed to nanotubes when the chemical etching process was adopted with appropriate KCl concentration and etching time. Uniform ZnO nanotube...
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