Micro- and Nanocubes of Silicon with Zinc-Blende Structure

Liu, P.; Cao, Y. L.; Cui, Hao; Chen, Xin Yi; Yang, Guowei

doi:10.1021/cm7027178

Cited by 30 publications

(27 citation statements)

References 58 publications

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“…Liu et al suggested that the Raman shift seen for their larger sized silicon nanocubes (200-500 nm) was not due to the quantum size effect but instead attributed to the crystalline defects in the silicon cubes themselves. [31] Similarly, given the larger size of the silicon tetrahedra, we believe that the downshifted peak can also be contributed to crystalline defects, such as dislocations which were routinely observed under TEM and SEM analysis.…”

Section: Resultsmentioning

confidence: 86%

The evolution of pseudo-spherical silicon nanocrystals to tetrahedra, mediated by phosphonic acid surfactants

et al. 2009

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Silicon nanocrystals were synthesised at high temperatures and high pressures by the thermolysis of diphenylsilane using a combination of supercritical carbon dioxide and phosphonic acid surfactants. Size and shape evolution from pseudo-spherical silicon nanocrystals to well faceted tetrahedral-shaped silicon crystals with edge lengths in the range of 30-400 nm were observed with sequentially decreasing surfactant chain lenghts. The silicon nanocrystals were characterized by transmission electron microscopy (TEM), energydispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), photoluminescence (PL), scanning electron microscopy (SEM) and Raman scattering spectroscopy.

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Section: Resultsmentioning

confidence: 86%

The evolution of pseudo-spherical silicon nanocrystals to tetrahedra, mediated by phosphonic acid surfactants

et al. 2009

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“…11b (from which 4 particles of the Si/Au core/shell NPs can be definitely identified). Figure 11d provides four examples of Raman spectra obtained from the Si/Au core/shell sample, condensed pure Au NPs reported elsewhere, 34,35 condensed Si NPs prepared by laser ablation in pure water, 36,37 The peak at 1089.0 cm −1 is attributed to a combination of the phenyl ring-breathing mode, C-H in-plane bending, and C-S stretching, 29 while the peak at 1579.9 cm −1 , which can be as attributed to the phenyl stretching motion, 40 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 …”

Section: Sers Of An As-synthesized Single Si/au Core/shell Nanospherementioning

confidence: 92%

Fabrication of Si/Au Core/Shell Nanoplasmonic Structures with Ultrasensitive Surface-Enhanced Raman Scattering for Monolayer Molecule Detection

et al. 2015

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Nanoparticles of noble metals are typically plasmonic materials, but the pure metals have high non-irradiative ohmic losses at optical frequencies, leading to large absorption and unwanted heating effects. Additionally, spherical silicon nanoparticles (NPs) have a unique optical system with a high-refractive-index dielectric nanostructure. Combining these two components in one functional core/shell NP nanostructure of Si/M, where M represents a noble metal, to produce resonant optical electronic and magnetic responses has been rare. Herein, an approach for the assembly of Si/M core/shell NPs is developed based upon double-beam laser ablation in liquid, thereby fabricating a series of Si/M (M=Au, Ag, Pd and Pt) core/shell NPs and characterizing the intense visible-light scattering modes from the as-fabricated Si/Au NPs as a nanoplasmonic structure. Dark-field optical measurements show that these Si/Au NPs have a strong electromagnetic response in the visible-light region, and the resonant frequencies can be modulated by NP size and morphology. The dispersed NPs are used as a highly-sensitive surface-enhanced Raman scattering (SERS) active probe for detecting monolayer molecules, as proven herein using 4-MBT molecules. A SERS plasmonic enhancement factor of ~10 8 is found for these Si/Au NPs by correlating the SERS measurement with scanning electron microscopy analysis. These findings present the possibility of confining light in ubiquitous silicon-based semiconductor technologies and manipulating the optical properties of nontraditional plasmonic nanostructures, while also opening up new perspectives.This technique can be extended to other noble metals to form similar structures and fabricate low-loss metamaterials and nanophotonic devices.

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“…The Ag NPs colloidal solution is prepared by laser ablation in liquid, which is described in detail in our previous work. [32][33][34][35] Fig. 10 shows the bactericidal coefficients of Ag NDs and NPs with contacting times with bacteria of 30 s, 5 min and 30 min, respectively, at a concentration of 8 mg L À1 at room temperature.…”

Section: Antimicrobial Activity Of the As-synthesized Ag Ndsmentioning

confidence: 99%

Super-SERS-active and highly effective antimicrobial Ag nanodendrites

Liu

Liang

et al. 2012

Nanoscale

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We have developed simple and green electrochemistry to synthesize Ag nanostructures with high purity, good crystallinity and smooth surface for applications as super-SERS (surface-enhanced Raman scattering), SERS-active substrates and with highly effective antimicrobial activities. This synthesis takes place in a clean and slow reaction environment without any chemical additives, which ensures an ultrahigh active surface of the as-synthesized Ag nanostructures owing to their purity, good crystallinity and smooth morphology. Using this method, we synthesized nearly perfect Ag nanodendrites (NDs), which exhibit super-SERS sensitivity when they are used to detect the SERS spectra of rhodamine 6G at concentrations as low as 5 × 10(-16) M, and have an ultrahigh electromagnetic (EM) enhancement factor of the order of 10(13), breaking through the theoretical limit of EM enhancement. Meanwhile, the as-synthesized Ag NDs possess highly effective antimicrobial activities for Escherichia coli, Candida albicans and Staphylococcus aureus, which are over 10 times that of silver nanoparticles. Additionally, the basic physics and chemistry involved in the fabrication of Ag nanostructures are pursued. These investigations show that silver nanostructures with highly active surfaces can make the most of Ag nanostructures functioning as super-SERS-active substrates and multiple antibiotics.

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Micro- and Nanocubes of Silicon with Zinc-Blende Structure

Cited by 30 publications

References 58 publications

The evolution of pseudo-spherical silicon nanocrystals to tetrahedra, mediated by phosphonic acid surfactants

The evolution of pseudo-spherical silicon nanocrystals to tetrahedra, mediated by phosphonic acid surfactants

Fabrication of Si/Au Core/Shell Nanoplasmonic Structures with Ultrasensitive Surface-Enhanced Raman Scattering for Monolayer Molecule Detection

Super-SERS-active and highly effective antimicrobial Ag nanodendrites

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