Bulk synthesis of a-SixNyH and a-SixOy straight and coiled nanowiresElectronic supplementary information (ESI) available: Movies taken using a microscope. File RI19, shows a white fringe (Becke Line), which surrounds the particle, shift into the particle when the lens is moved farther away from focus. This indicates that the RI of the particle is greater than the surrounding calibration solution (RI = 1.9). Files RI21 and RI23 show the Becke line moving from the particle into the surrounding indicating tha

Sunkara, Mahendra K.; Sharma, Shashank; Chandrasekaran, Hari; Talbott, Mark; Krogman, Kevin C.; Bhimarasetti, Gopinath

doi:10.1039/b311887h

Cited by 26 publications

(11 citation statements)

References 17 publications

(23 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Earlier, we showed that Si nanowire growth using low-melting metal droplets is not limited by the cluster size and occurs at a high density from a single droplet . Later, this concept has been used for demonstrating the synthesis of several materials systems such as Si, Bi, amorphous SiO 2 , and Si x N y H nanowires . In particular, the direct synthesis of nanowires of compounds of low-melting metals such as Group III-nitrides, sulfides, oxides, and so forth under metal-rich conditions fall under this concept as well.…”

Section: Introductionmentioning

confidence: 97%

Rationalization of Nanowire Synthesis Using Low-Melting Point Metals

2006

Self Cite

View full text Add to dashboard Cite

In this paper, we provide a theoretical basis using thermodynamic stability analysis for explaining the spontaneous nucleation and growth of a high density of 1-D structures of a variety of materials from lowmelting metals such as Ga, In, or Sn. The thermodynamic stability analysis provides a theoretical estimate of the extent of supersaturation of solute species in molten metal solvent. Using the extent of maximum supersaturation, the size and density of critical nucleus were estimated and compared with experimental results using nucleation and growth of Ge nanowires using Ga droplets. The consistency of the proposed model is validated with the size and density of the resulting nanowires as a function of the synthesis temperature and droplet size. Both the experimental evidence and the theoretical model predictions point that the diameters of the resulting nanowires decrease with the lowering of synthesis temperatures and that the nucleation density decreases with the size of metal droplet diameter and increasing synthesis temperature.

show abstract

Section: Introductionmentioning

confidence: 97%

Rationalization of Nanowire Synthesis Using Low-Melting Point Metals

2006

Self Cite

View full text Add to dashboard Cite

show abstract

“…A rich variety of 1D Si or SiO x nanowires have been prepared on the 2D surfaces, like Si wafer and quartz substrates, onto which metal catalysts were deposited by thermal evaporator or sputter. The subsequent thermal annealing process leads to the formation of a metal nanocluster due to an effect of surface tension. , With these approaches, it is not easy to control the size and spatial location of the metal catalyst and it cannot be extended to 3D surfaces, like bulk Si powder. In this study, we employed block copolymer micelles to make uniform-sized Pt nanoparticles.…”

mentioning

confidence: 99%

Helical Silicon/Silicon Oxide Core–Shell Anodes Grown onto the Surface of Bulk Silicon

et al. 2011

View full text Add to dashboard Cite

We demonstrate a simple route for preparing Si/SiO(x) urchin-like structures in which Si/SiO(x) core-shell nanocoils protruded out from the surface of bulk Si, via high-temperature annealing of Pt-decorated Si powders. The carbon-coated urchin-like anodes with micro- and nanostructured composite exhibit a significantly improved electrochemical performance with a high specific capacity of 1600 mAh/g and a superior cycling performance of 70 cycles at a rate of 0.2 C due to the nanocoil conformation and SiO(x) buffer layer. More importantly, the composite results in a significantly enhanced the volumetric capacity with ∼3780 mAh/cc, compared to bulk Si (∼2720 mAh/cc) after fully lithiation to 0 V.

show abstract

“…[1][2][3][4] By reducing the sizes of one-and twodimensional nanostructures, unusual transport, structural, and optical properties have been demonstrated. These properties are largely due to the size-dependent quantum confinement effects and additional surface electron states.…”

mentioning

confidence: 99%

Raman-active wurtzite CdO nanophase and phonon signatures in CdO/ZnO heterostructures fabricated by nonequilibrium laser plasma ablation and stress control

Ashrafi

Ostrikov

2011

Applied Physics Letters

View full text Add to dashboard Cite

A combination of laser plasma ablation and strain control in CdO/ZnO heterostructures is used to produce and stabilize a metastable wurtzite CdO nanophase. According to the Raman selection rules, this nanophase is Raman-active whereas the thermodynamically preferred rocksalt phase is inactive. The wurtzite-specific and thickness/strain-dependent Raman fingerprints and phonon modes are identified and can be used for reliable and inexpensive nanophase detection. The wurtzite nanophase formation is also confirmed by x-ray diffractometry. The demonstrated ability of the metastable phase and phonon mode control in CdO/ZnO heterostructures is promising for the development of next-generation light emitting sources and exciton-based laser diodes.

show abstract

Cited by 26 publications

References 17 publications

Rationalization of Nanowire Synthesis Using Low-Melting Point Metals

Rationalization of Nanowire Synthesis Using Low-Melting Point Metals

Helical Silicon/Silicon Oxide Core–Shell Anodes Grown onto the Surface of Bulk Silicon

Raman-active wurtzite CdO nanophase and phonon signatures in CdO/ZnO heterostructures fabricated by nonequilibrium laser plasma ablation and stress control

Contact Info

Product

Resources

About