Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iva metal
Reexamination Certificate
2011-03-15
2011-03-15
Bos, Steven (Department: 1736)
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group iva metal
C423S508000, C423S509000, C423S561100, C423S619000, C977S773000, C977S811000
Reexamination Certificate
active
07906084
ABSTRACT:
Disclosed is a method for producing, controlling the shape and size of, Pb-chalcogenide nanoparticles. The method includes preparing a lead (Pb) precursor containing Pb and a carboxylic acid dissolved in a hydrocarbon solution and preparing a chalcogen element precursor containing a chalcogen element dissolved in a hydrocarbon solution. The amount of Pb and chalcogen in the respective precursor affords for a predetermined Pb:chalcogen element ratio to be present when the Pb precursor is mixed with the chalcogen element precursor. The Pb precursor is mixed with the chalcogen element precursor to form a Pb-chalcogen mixture in such a manner that Pb-chalcogenide nanoparticle nucleation does not occur. A nucleation and growth solution containing a surfactant is also prepared by heating the solution to a nucleation temperature sufficient to nucleate nanoparticles when the Pb-chalcogen element mixture is added. Upon injection of the Pb-chalcogen element mixture into the heated nucleation and growth solution, Pb-chalcogenide nanoparticles nucleate and a Pb-chalcogenide nanoparticle solution is formed, which is thereafter cooled to a growth temperature that is below the nucleation temperature. The Pb-chalcogenide nanoparticle solution at the growth temperature is held at the growth temperature for a predetermined time period such that a desired nanoparticle size is obtained. The Pb:chalcogen element ratio and a surfactant in the nucleation and growth solution can control the shape of the Pb-chalcogenide nanoparticles. The nucleation temperature, the growth temperature, the time at which the Pb-chalcogenide nanoparticle solution is held at the growth temperature and a surfactant can control the size of the Pb-chalcogenide nanoparticles.
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Mokari Taleb
Yang Peidong
Zhang Minjuan
Bos Steven
Gifford Krass Sprinkle Anderson & Citkowski P.C.
Toyota Motor Engineering & Manufacturing North America, Inc
University of California - Berkeley
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