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CuO Thin Films Functionalized with Gold Nanoparticles for Conductometric Carbon Dioxide Gas Sensing
摘要： Metal oxides (MOx) are a well-established material for gas sensing. MOx-based gas sensors are sensitive to a wide variety of gases. Furthermore, these materials can be applied for the fabrication of low-cost and -power consumption devices in mass production. The market of carbon dioxide (CO2) gas sensors is mainly dominated by infra-red (IR)-based gas sensors. Only a few MOx materials show a sensitivity to CO2 and so far, none of these materials have been integrated on CMOS platforms suitable for mass production. In this work, we report a cupric oxide (CuO) thin film-based gas sensor functionalized with gold (Au) nanoparticles, which exhibits exceptional sensitivity to CO2. The CuO-based gas sensors are fabricated by electron beam lithography, thermal evaporation and lift-off process to form patterned copper (Cu) structures. These structures are thermally oxidized to form a continuous CuO film. Gold nanoparticles are drop-coated on the CuO thin films to enhance their sensitivity towards CO2. The CuO thin films fabricated by this method are already sensitive to CO2; however, the functionalization of the CuO film strongly increases the sensitivity of the base material. Compared to the pristine CuO thin film the Au functionalized CuO film shows at equal operation temperatures (300 ?C) an increase of sensitivity towards the same gas concentration (e.g., 2000 ppm CO2) by a factor of 13. The process flow used to fabricate Au functionalized CuO gas sensors can be applied on CMOS platforms in specific post processing steps.
关键词： metal oxides,CMOS integration,CO2,gas sensors,CuO
更新于2025-09-09 09:28:46
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Surface Morphology Effects on Photocatalytic Activity of Metal Oxides Nanostructured Materials Immobilized onto Substrates
摘要： Structure, shape and surface morphology of the material are directly determined by the substrate and growth method used for material fabrication of nanostructured metal oxides. Those characteristics play a crucial role in the photocatalytic activity of the material. This paper presents a short review of some of the most recent relevant publications regarding pure and doped nanostructured metal oxides used for photocatalytic applications focusing on the structure, shape and surface morphology of the material effects on photocatalytic activity. The cases of TiO2, ZnO and CuO metal oxides as well as various semiconductors and metal doping were reviewed. It was concluded that, according to the reviewed communications, the most important surface parameters affecting photocatalytic activity are surface area, surface to volume ratio, nanocrystallites size and crystallinity regardless the material. In particular, for each material, more surface parameters may be of significance.
关键词： Surface Morphology,Photocatalytic Activity,Metal Oxides
更新于2025-09-09 09:28:46
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Synthesis of copper oxide nanowires with an emphasis on analyzing the effect of oxidation time on the growth of nanowires
摘要： Copper nanowires offers a wide variety of applications in domains like electronics, energy harvesting and heat transfer. Here, spherical copper has been thermally oxidized to produce nano-wired particles. The length and diameter of these CuO nanowires are in the range of approximately 3–15 μm and 100–300 nm respectively. SEM images of the oxidized copper particles were examined to understand the effect of oxidation time on the length and population density of the nanowire. Oxidation times were set from 15 min to 4 h. We report a direct relation between oxidation time and the population density of the nanowires. An increase in length of the wires was observed up to an oxidation time of 3 h, however, further increase in oxidation time did not signi?cantly contribute to an increased length of nanowires. XRD and TGA was performed to identify the phases of CuO and oxidation rate of Cu respectively.
关键词： thermal oxidation,copper nanowires,metal oxides,copper oxide nanowires
更新于2025-09-09 09:28:46
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Hydrothermal Approach to Spinel-Type 2D Metal Oxide Nanosheets
摘要： The peculiar physical and chemical properties of 2D nanostructures have aroused global research interest in developing new members, synthetic technology, and exploring their potential applications in functional nanodevices. However, it is extremely challenging to directly obtain the 2D nanosheets for these extrinsic layered structures using conventional routines. In this work, we demonstrate the facile and general synthesis of 2D spinel-type metal oxides nanosheets through a simple hydrothermal reaction. Using this method, cubic γ-Ga2O3, ZnGa2O4 and MnGa2O4 nanosheets with triangular/hexagonal configuration and ultrathin thickness have been synthesized, and all these nanosheets show preferential growth along (111) plane with the minimum formation energy. Microstructural and composition analyses using HRTEM, EDS, XPS, and so on reveal that the as-synthesized 2D nanosheets are well-crystallized in cubic fcc-phase and show high purity in composition, and the formation process of MGa2O4 nanosheets can be regarded as the competition of M2+ and Ga3+ in tetrahedral site. Spatially resolved cathodoluminescence measurement of individual 2D nanosheet shows that the γ-Ga2O3, ZnGa2O4, and MnGa2O4 nanosheets exhibit distinct luminescence behavior, and ZnGa2O4 nanosheets show the strongest emission in visible region. It is expected that the facile synthesis of spinel-type metal oxides of γ-Ga2O3, ZnGa2O4, and MnGa2O4 nanosheets will further promote the exploration of a variety of semiconductor nanostructures that could not be achieved using conventional technology suitable for layered structures and will also open up some opportunities for the integration of advanced functional nanodevices such as photodetectors, phosphors on the basis of them.
关键词： spinel-type metal oxides,functional nanodevices,2D nanostructures,luminescence behavior,hydrothermal reaction
更新于2025-09-04 15:30:14