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Showing 1 to 13 of 13 for “"trimethylaluminum"”.
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Heterogeneous decomposition of trimethylaluminum and trimethylgallium on silicon surfaces
Trimethylaluminum (TMAl) and trimethylgallium (TMGa) are important source gases for use in MOCVD and MOMBE. This study uses thermal desorption spectroscopy, x-ray photoelectron spectroscopy, and electron energy loss spectroscopy to examine the decomposition of TMAl at low coverages on heated …
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Photolytic Laser-Induced Chemical Vapor Deposition for Aluminum Film Growth
The mechanisms of UV photodissociation of trimethylaluminum (TMA) and triethylaluminum (TEA) by a KrF (248 nm) pulsed excimer laser were investigated using optical emission spectroscopy, including time-resolved emission measurements. Position-resolved growth rate measurements were used to …
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Fabrication of nanostructures with the scanning tunneling microscope and the laser
… is used to break the chemical bonds of gas-phase trimethylaluminum molecules to free aluminum atoms in the region of the tunneling gap of the STM. The atoms are subsequently selectively excited and ionized. The ions are then driven softly toward the surface where they are deposited by the field in …
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Investigations into cyclopropanation and ethylene polymerization via salicylaldiminato copper (II) complexes
… salts with different colors. Ligand transfer to trimethylaluminum (TMA) appears to explain low yield ethylene polymerization.
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The preparation and study of alkylated phosphazenes
… products can not be obtained. The reaction of trimethylaluminum (TMA) with (N₃P₃Cl₆) was examined and found to yield the fully substituted hexamethylcyclotriphosphazene (N₃P₃(CH₃)₆) in modest yield (40 %). The study of this reaction, with respect to time allowed for the determination of the …
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Phosphinimide complexes of titanium: Synthesis and reactivity studies of a new family of organometallic compounds.
… pathways. It was determined that reaction of trimethylaluminum with certain titanium-phosphinimide alkyls produced carbide cluster complexes through C-H bond activation. Crystal structures of these clusters showed the carbide carbon atoms in four or five coordinate geometries. In addition, …
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Synthesis of well-defined single and multiphase polymers using various living polymerization methods
… The aluminum porphyrins were formed by reacting trimethylaluminum with TPPH₂ to yield TPPAIMe. The resulting aluminum porphyrin was modified by adding a stoichiometric amount of various carboxylic acids to form aluminum porphyrin carboxylates that had varying steric and electronic effects on the …
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Surface reaction mechanisms as a function of surface composition, adsorbate coverage, and adsorbate acidity: I. Trimethylgallium on metal-treated silicon. II. Hexafluoropentanedione, methanol, and acetone on copper
… transferred to the surface aluminum atoms and trimethylaluminum desorbs. Gallium atoms are left on the surface. The reactivities of the group III organometallics on group III metal-rich surfaces depend on the electronegativity differences between the coordinated metal atom in the adsorbate and …
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STUDY OF THE SELECTIVE GROWTH OF THIN FILMS: EFFECTS OF A THIRD SPECIES IN ATOMIC LAYER DEPOSITION
… may also help achieve selective area deposition. Trimethylaluminum (TMA) and water is the most well-studied system in the ALD community, and TMA is known for its high reactivity due to an empty p orbital of the Al atom. Preliminary density functional theory (DFT) calculations of the effect of …
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Impact of Chemical States on the Effective Work Function of Metal Gate and High-kappa Dielectric Materials on Novel Heterostructures
… a better understanding of the interactions of Trimethylaluminum (TMA) or Tertrakis(EthylMethylAmino)Hafnium (TEMAH) with hydrolyzed GaN clusters, it is found that a Ga-N(CH3)(CH2CH3) bond can form during the deposition of HfO2 using ALD and TEMAH as the reactant without breaking the Hf-N bond. …
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Late-stage C(sp3)–H hydroxylation, amination, and methylation in nitrogen-containing molecules
… The use of the commercial mild nucleophile, trimethylaluminum, along with one of three mild hemiaminal activation methods (BF3, DAST, TFAA/TMSOTf), enabled late-stage methylation on nine derivatives of drugs and natural products without eroding electrophilic functional groups or causing …
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Solid-state NMR (¹³C, ²⁷Al and ²⁹Si) study of the reaction between AlMe₃ and the silica gel surface
The reaction between the silica gel surface and trimethylaluminum (AlMe3) has been studied in this thesis research. We have examined the AlMe3/silica reaction in the following stages: the initial AlMe3-reacted silica surface after it had been treated with AlMe3; the AlMe3-treated surface after it …