Spontaneous Hierarchical Assembly of Rhodium Nanoparticles into Spherical Aggregates and Superlattices
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- 作者：Trevor D. Ewers ; Amandeep K. Sra ; Brent C. Norris ; Robert E. Cable ; Chil-Hung Cheng ; Daniel F. Shantz ; and Raymond E. Schaak
- 刊名：Chemistry of Materials
- 出版年：2005
- 出版时间：February 8, 2005
- 年：2005
- 卷：17
- 期：3
- 页码：514 - 520
- 全文大小：331K
- 年卷期：v.17,no.3(February 8, 2005)
- ISSN：1520-5002
文摘
Reduction of aqueous RhCl3 with NaBH4 in the presence of poly(vinyl pyrrolidone) (PVP) yieldsdense spherical nanostructures. The spherical aggregates, which generally have diameters between 10and 100 nm, are built from smaller 1-3 nm Rh particles. The dense nanostructures are thermally stablebeyond 100 
C, and they have a tendency to form ordered superstructures upon drying. Combining sodiumn-dodecyl sulfate (SDS) with PVP modifies the size and morphology of the primary 1-3 nm particles,but does not change the spherical shape of the aggregates except at high concentrations of SDS. Small-angle X-ray scattering measurements show that the large aggregates are formed directly in solution fromsmall Rh particles, consistent with TEM and AFM results. Magnetic measurements indicate that the Rhnanoparticle aggregates are Pauli paramagnetic.
C, and they have a tendency to form ordered superstructures upon drying. Combining sodiumn-dodecyl sulfate (SDS) with PVP modifies the size and morphology of the primary 1-3 nm particles,but does not change the spherical shape of the aggregates except at high concentrations of SDS. Small-angle X-ray scattering measurements show that the large aggregates are formed directly in solution fromsmall Rh particles, consistent with TEM and AFM results. Magnetic measurements indicate that the Rhnanoparticle aggregates are Pauli paramagnetic.