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The growth of silicon films via chemical vapor deposition (CVD) is of considerable importance in the microelectronics and photo-voltaics industries. This process often involves the thermal decomposition of silane, which is achieved by heating the wafer or rod to be coated to a suitable temperature. A wide range of geometries and conditions are employed. For(More)
Product contamination by particles nucleated within the processing environment often limits the deposition rate during chemical vapor deposition processes. A fundamental understanding of how these particles nucleate could allow higher growth rates while minimizing particle contamination. Here we present an extensive chemical kinetic mechanism for silicon(More)
CO2 laser induced pyrolysis of silane was used to produce silicon nanoparticles with an average diameter as small as 5 nm at high rates (up to 200 mg/h). Etching these particles with a mixture of hydrofluoric acid (HF) and nitric acid (HNO3) reduces their size and passivates their surface such that they exhibit bright visible photoluminescence (PL). This(More)
Ž The structures and energies of eight fully saturated polycyclic polysilanes were investigated using ab initio molecular orbital calculations. Structures and vibrational 9 14 10 14 10 16 Ž. Ž. frequencies were computed at the HFr3-21G d level. A complete basis set extrapolation method CBS-4 was used to calculate the energies of the structures. Heats of(More)
Nanoparticles of iron have been prepared by laser-driven decomposition of iron pentacarbonyl vapor. In this method, an infrared laser rapidly heats a dilute mixture of precursor vapors to decompose the precursor and initiate particle nucleation. It was found that when using SF 6 as a photosensitizer during the synthesis, ferrous fluoride (FeF 2) was(More)
MOTIVATION Novel high-throughput genomic and proteomic tools are allowing the integration of information from a range of biological assays into a single conceptual framework. This framework is often described as a network of biochemical reactions. We present strategies for the analysis of such networks. RESULTS The direct differential method is described(More)
Silicon nanoparticles with bright visible photoluminescence have been prepared by a new combined vapor phase and solution phase process, using only inexpensive commodity chemicals. CO2 laser induced pyrolysis of silane was used to produce Si nanoparticles at high rates (20-200 mg/h). Particles with an average diameter as small as 5 nm were prepared directly(More)
Quantum dots (QDs) have size-dependent optical properties that make them uniquely advantageous for in vivo targeted fluorescence imaging, traceable delivery, and therapy. The use of group II-VI (e.g., CdSe) QDs for these applications is advancing rapidly. However, group II-VI QDs contain toxic heavy metals that limit their in vivo applications. Thus,(More)
Tremendous research efforts have been devoted to fabricating high quality quantum dots (QDs) for applications in biology and medicine. Much of this research was pursued with an ultimate goal of using QDs in clinical applications. However, a great deal of concern has been voiced about the potential hazards of QDs due to their heavy-metal content. Many(More)
1 Multifunctional nanoparticles as biocompatible targeted probes for human cancer diagnosis and therapy The use of nanoparticles in biological applications has been advancing toward applications in human cancer diagnosis and therapy. Upon functionalizing the nanoparticles with biomolecules, they can be used to locate cancerous areas and for drug delivery.