Controllable Synthesis and Growth Model of Amorphous Silicon Nanotubes with Periodically Dome‐Shaped Interiors

Abstract

strate rotation, x sub , was related to the deposition rate, r, and the pitch of the film, p, as follows: p = r/x sub . Deposition rates were in the range 5-15 Å s -1 . Samples on both the silicon and glass substrates were cleaved using a diamond scribe prior to SEM imaging.Transmission Ellipsometry: A variable-angle spectroscopic ellipsometer (VASE, J. A. Woollam, Inc.) used in transmission mode was used to measure the transmission of p-and s-polarized light through the samples deposited on glass, and also to measure the transmission Mueller matrix of these samples, with the m 11 coefficient normalized to 1 at all wavelengths. Scans were performed in the wavelength range 400-700 nm. The transmission of p-and s-polarized light was averaged to determine the un-normalized m 11 (k) element of the Mueller matrix, which was used in combination with the m 14 (k) element to determine the selective transmission for the samples.Photoluminescence Detection: The photoluminescence response of the films was measured using the 365 nm emission line of a mercury lamp (Hamamatsu LightningCure L8333) for excitation and a spectrometer (Ocean Optics USB2000) for detection. The excitation light was focused onto a 5 mm by 5 mm square region. The polarization emitted for the helical films was measured by placing a quarter waveplate and a Glan-Taylor polarizer between the sample and the spectrometer for the helical films, with the fast axis of the waveplate oriented at ±45°to the polarizing axis. The orientation of the polarizer was kept constant with respect to the spectrometer grating, in order to eliminate the polarization sensitivity of the detector. The dense reference film was also tested in this setup and showed identical photoluminescence spectra, and thus a null dissymmetry factor spectrum, for both left-and right-handed emission.

Synthesis of inorganic nanomaterials

“…Controllable syntheses of SiO 2 nanotubes with dome shaped interiors have been prepared by pyrolysis of silanes over Au catalysts. 282 High aspect-ratio, self-organized nanotubes of TiO 2 are obtained by anodization of titanium. 283 These self-organized porous structures consist of pore arrays with a uniform pore diameter of ∼100 nm and an average spacing of 150 nm.…”

Preparation of silicon nanomaterials by arc discharge

“…Metallic (armchair) and semiconductor (zigzag and mixed) characteristics of SiNTs have been demonstrated by first-principle calculations [79]; and metallic single-walled SiNTs were reported, using ab initio calculations [76]. Although some papers have been published on the preparation of the SiNTs by other methods [80][81][82][83][84][85][86][87][88], there are few papers in which the arc discharge method was adopted. But as a whole, it seems that the studies on the SiNTs may be developed rapidly in the coming years (the number of literatures in the online database of SCI in last five years is about half of the total literatures since 2000).…”

First-Principles Study of Electronic Structure and Optical Properties of Silicon/Carbon Nanotube

“…Recently, there has been a rapid growth research interests in advanced nanotechnology which gives great promise for achieving new sensing materials including high performance nanomaterials [6] and nanoscale eletronics devices [7]. Silicon, as the same group element with carbon in the periodic table of elements has similar structure with carbon, and [8], template combined CVD [9]. In terms of theory, Luo et al [10] studied the structures and electronic properties of pure (5,5) and (5,0) SiNTs with the first principles of density functional method, and found that the conductivity of SiNTs was connected with the chirality of its structure.…”