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Park, Soojin
Nano-Functional Materials Lab
Research Interests
  • Block Copolymers, nanostructured materials for Lithium-Ion batteries, wearable and stretchable energy storage applications

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Shape control of cadmium hydroxides (Cd(OH)(2)) sensitive to pH quenching depth and massive production of CdSe nanocrystals by their chemical transformation

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Title
Shape control of cadmium hydroxides (Cd(OH)(2)) sensitive to pH quenching depth and massive production of CdSe nanocrystals by their chemical transformation
Author
Ko, SungwookMoon, Geon DaeLee, Jung-PilPark, SoojinJeong, Unyong
Keywords
Aqueous condition; Cadmium hydroxide; Cadmium nitrate; CdSe nanocrystals; Chain-like; Chemical transformations; Massive production; Micro-particles; Porous aggregates; Precursor solutions; Pure water; Ripening process; Saturated solutions; Shape control; Si nanowire; Synthesis process; Ultrafine
Issue Date
201108
Publisher
IOP PUBLISHING LTD
Citation
NANOTECHNOLOGY, v.22, no.31, pp.1 - 7
Abstract
This study demonstrates that the structure of cadmium hydroxides (Cd(OH)(2)) precipitated from a basic cadmium nitrate solution can be finely controlled by adjusting the pH of the precursor solution. The synthesis process involves only pouring the saturated solution into pure water to quench the pH and the total process is finished within 30 s. At a shallow pH quenching, the unstable nanoparticles turned into microparticles via a ripening process. Cd(OH)(2) was precipitated in the form of one-dimensional nanowires and then two-dimensional plates as the pH quenching was increased. At a large pH quenching, porous aggregates of Cd(OH)(2) were obtained due to the too fast precipitation. The ultrafine Cd(OH)(2) nanowires were readily transformed into CdSe chain-like nanocrystals. The transformation was quick and gave 100% yield, facilitating massive production of CdSe nanocrystals in an aqueous condition. The Cd(OH)(2) nanowires were directly grown on Si nanowires and transformed into CdSe chain-like nanocrystals, decorating the surface of each Si nanowire.
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DOI
http://dx.doi.org/10.1088/0957-4484/22/31/315604
ISSN
0957-4484
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