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The electrochemical detection of tetrabromobis-phenol A (TBBPA) with boron-doped diamond (BDD) thin film electrode is demonstrated. The electrode is synthesized by filament-assisted chemical vapor deposition. An irreversible oxidation peak is observed for TBBPA in phosphate buffer on BDD surface. A method to renew the electrode is developed by sweeping in H2SO4 at 3V for 100s first and at −3V for...
The paper studies the thin film of TiO2 nanotube arrays about diameter of 40 µm, which grown by electrochemically second anodization using titanium foil. The structure and compositions of nanotube arrays were characterized by scanning electron microscopy (SEM). Use the same electrolytes solution can grown three samples of TiO2 nanotube arrays under different times. That will be accordingly economize...
In this work we present our recent investigation on characterizing mechanical properties of porous silicon (PS) by using instrumented micro-indentation. Hardness and elastic modulus for oxidized and nonoxidized PS were measured. Experimental results revealed that hardness and elastic modulus are significantly lower than that of silicon substrate and decrease with increasing porosities. After oxidation...
With the increasing using temperature, the magnetic performance of high temperature stable Sm2Co17 type permanent magnet will be decreased. In order to explore the effect of the high temperature on microstructure of the alloy, the differential thermal analysis (DTA) was made and three distinct phase transformation temperature 254 °C, 342 °C and 540 °C were obtained. Then X-ray diffraction (XRD), scanning...
With the increasing using temperature, the magnetic performance of high temperature stable Sm2Co17 type permanent magnet will be decreased. In order to explore the effect of the high temperature on microstructure of the alloy, the differential thermal analysis (DTA) was made and three distinct phase transformation temperature 254 °C, 342 °C and 540 °C were obtained. Then X-ray diffraction (XRD), scanning...
A macroporous silicon micromonolith containing ca. 40,000 regular channels of 3.3 μm in diameter per square millimeter has been successfully functionalized with an Au/TiO2 catalyst for CO preferential oxidation (CO-PrOx) in the presence of hydrogen. The functionalization of the silicon microchannels has been accomplished by growing a SiO2 layer on the channel walls, followed by exchange with a titanium...
Biosensors for detecting/measuring/monitoring the concentration of neurotransmitters that vary at sub-second time-scale can be achieved by using an electrode with high temporal resolution and fast electron transfer kinetics. Neurotransmitters, such as dopamine, undergo rapid fluctuations in concentrations occurring at a sub-second time scale. Real-time monitoring and measurement of these concentrationn...
Tin whisker growth phenomena from rare-earth tin alloys were investigated with both scanning electron microscopy and transmission electron microscopy. Large quantities of tin whiskers with diameters from 20 nm to 10 µm and length from 50 nm to 500 µm were formed on the surface of the alloys at a growth rate of 0.1∼1.8 nm·s−1. The growth directions of tin whiskers were studied among more than 200 whiskers...
Mn1Ce1 and Mn0.9Co0.1Ce1 complex oxides were prepared by co-precipitation in hydrothermal conditions and their physicochemical properties were characterized with N2 adsorption, XRD, Raman, and SEM. The complex oxides show enough stability and catalytic activity for oxidative degradation of 4,4'-Dibromobiphenyl in sub-critical water. Mn0.9Co0.1Ce1 has higher activity than Mn1Ce1, indicating doping...
Large polyaniline-coated polystyrene (PANI-PS) latex particles (13μm in diameter) were used for measuring the limiting current of the suspension reaction on the carbon microelectrode (7μm in diameter). Two results were observed: one was no particle reaction on electrode, and the other was only one particle reacted on the electrode with the limiting current about 30pA. This value is almost the same...
Visible-light response CoAl2O4, MgFe2O4 and CoFe2O4 spinel nanoparticles were prepared by the inorganic salt sol-gel method, and characterized by using XRD, SEM and UV-Vis. The characterization show that the three photocatalysts were in spinel-type structure with the spherical-like particle size in the range of 3~20 nm. The absorbing wavelengths of the three photocatalysts were larger than 800 nm...
The aims of this work are to prepare micro-arc oxidation coatings on the surface of ZAlSi12Cu2Mg1 aluminum alloy in Na2SiO3+NaOH+Na2EDTA electrolytes with and without Zr(NO3)4 and study their formation and characteristics. The phase constituent, surface microscopic morphology and cross-sectional morphology of the ceramic coatings were analyzed by XRD(X-ray diffraction), SEM(scanning electron microscope)...
The application of copper wire coated with Palladium is a solution to prevent copper oxidation during the bonding process. This is true in the Second Bond but may not be the situation when it comes to First Bond. This is because during the Free Air Ball (FAB) formation, the Pd coated Cu wire is re-melted and the Pd distribution on the FAB is depending on various factors. For FAB formation, the simplest...
For high temperature automotive application, IC products are required to pass stringent high temperature storage stress test (e.g. 5000hrs at 150 deg C), hence requires reliable wire bonds. Such requirement is especially challenging with fine pitch Au & Cu wire bond (e.g. bond pad pitch <; 70um and bonded ball diameter <; 58um), more-so on low k wafer technology with bond-over-active requirement...
This paper suggests an improved method to round off the concave corners of the deep trenches formed by plasma etch. The corner rounding technique, sacrificial oxidation (SACOX) before gate oxidation, has been practiced on the shallow trench isolation (STI) to improve the CMOS leakage performance. However, the direct implementation of the SACOX on the deep trenched MOSFET having less than 0.5 um trench...
A Germanium-on-Insulator (GeOI) wafer was fabricated using low temperature direct wafer bonding method. A hydrogen implanted Ge donor wafer was bonded to a thermally oxided Si handle wafer with in-situ oxygen radical activation before bonding in a vacuum chamber. Ex-situ anneals were use to enhance the bond strength or exfoliate the implanted Ge wafer. The insight into the exfoliation mechanism of...
In this work, vacancies diffusion length scale or the size of the nanostructures involved during oxidation when utilizing the Kirkendall phenomenon is presented. Ni nanowires with different diameters are formed by electrodeposition of Ni into anodic aluminium oxide (AAO) membrane. The oxidation of the dispersed Ni nanowires is carried out either via rapid thermal oxidation (RTO) or conventional furnace...
Summary form only given. Commercial expandable graphite was heat at 900 °C to get the worm-like graphene nanosheets. Using sulfuric acid and potassium permanganate to oxidize the expanded graphene nanosheet could further minish the thickness of graphene oxide sheet to less than 1nm, and this way to get the graphene was proved to be mass producible (tens of gram). Free-standing graphene oxide paper...
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