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Showing 1 to 13 of 13 for “"TMAH"”.
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Experimental electrochemical investigation of Si/A1 in tetra-methyl ammonium hydroxide (TMAH)
… this work explores the electrochemistry of Si/TMAH and Al/Si/TMAH by measurements of open-circuit potentials (OCP) of a galvanic cell. It is found that the presence of Al in the etchant, electrically connected to the silicon, dominates the electrochemical reactions, and shifts the overall cell …
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Experimental investigation of anisotropic etching of silicon in tetra-methyl ammonium hydroxide
… non-toxic tetra-methyl-ammonium hydroxide (TMAH). Using a temperature-controlled etch apparatus, basic etch rate experiments on both Sid and Sin confirm and extend previous literature results. Extensive underetch experiments shows that the TMAH is qualitatively similar to other more common …
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Measurement of lignin and organic carbon in Lake Mead sediment
… environment. Tetramethylammonium hydroxide (TMAH) thermochemolysis at sub-pyrolysis temperatures of 300°C followed by GC-MS analysis showed a great promise in being able to semi quantitatively assess the nature of organic carbon in sediments. TMAH chemopyrolysis produces methylated …
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Organisch-geochemische Untersuchungen der Oberflächengewässer aus dem Einzugsgebiet der Sielacht Esens (Ostfriesland)
… area of the Sielacht Esens. Pyrolysis-GC/MS with TMAH (tetramethylammonium hydroxide) was used to characterize the DOM fractions on a molecular level. The obtained results are compared with the oxidative degradation by cupric oxide (CuO). Ratios of lignin-derived compounds are indicative of the …
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A Non-isolated Half Bridge Buck-based Converter For Vrm Application And Small Signal Modeling Of A Non-conventional Two Phase Bu
… (BMP), and tertamethylammonium hydroxide (TMAH) thermochemolysis gas chromatography/mass spectrometry (GC/MS). The hypothesis was that Fenton's reagent will remove refractory compounds that inhibit biodegradation and will produce smaller, more biodegradable organic molecules which will …
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A micromachined silicon vibrating-beam angular rate sensor : a design and implementation study
… using wet anisotropic etching of Si100 wafers in TMAH 25%. Several issues essential for a successful design are discussed. The required circuitry for actuation of the beam and detection of the Coriolis induced vibrations are discussed. A complete model for the mechanical and electrical components …
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Design and fabrication of nanostructures for thermal conductivity measurements and picosecond acoustics
… are used to pattern sub-micron patterning and TMAH wet etching and XeF2 etching are used to release the structures to free standing. Last, fabrication of metallic gratings is presented for picosecond acoustics. Generating and detecting picosecond acoustics are interested especially for …
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A flexible interconnection for integrated circuits
… and etching procedures. Anisotropic etchant TMAH is chosen to etch the silicon substrate. A special photomask is also designed for the fabrication. Several techniques, such as Silicon-On-Insulator, wafer lapping and Plasma Enhanced Chemical Vapor Deposition, are involved in this design to …
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Integration of ferroelectric thin films into silicon based microsystems
… and membranes is performed by back etching with TMAH, isotropic etching with SF6 plasma and by a sacrificial process. The latter one is based on silicon on insulator substrates, whereby the buried oxide is etched with HF-vapor. Furthermore, a process for the fabrication of freestanding copper …
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Célula solares de silicio para alta concentración: industrialización y células de contacto posterior
… ambas caras: el ataque químico anisotrópico con TMAH y el taladrado a alta velocidad con fresas de diamante. Este último proceso nos permite taladrar las células al final del proceso sin pérdida significativa de las características eléctricas de la célula, por lo que se puede simplificar mucho su …
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Speciation Analysis of Arsenic and Selenium by HPLC and Mass Spectrometry
… was directed towards enzyme, MeOH and KOH and TMAH extraction efficiencies together with retention of species information. Selenium speciation was performed using ion-exchange HPLC-ICP-MS. It was found that the selenium content, in the form of SeMet, was adequately extracted from the yeast …
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Synthesis and Characterization of Sulfonated Polyimides as Proton Exchange Membranes for Fuel Cells
… (30-220 °C) for 30 min and then titrated with TMAH using non-aqueous potentiometric titration. All the films that were aged up to 220 °C were still completely soluble in DMAc. Moreover, the sulfonic acid groups were unchanged. In addition, several new flexible sulfonated and unsulfonated …
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Evaluation of management practices and remediation techniques for improving water quality in agricultural systems
Surface water quality impairment is often associated with agricultural activities. In this study, the effects of three sugarcane residue management techniques, namely burning (BR), shredding (SR), and retention (RR) of residues on: surface water quality, carbon export, and chemical composition of …