1,721,113 research outputs found
INOR 1050-Synthesis of helical m-aminobenzoic acid nanobelts via vaporization-condensation-recrystallization process
No full textX11sciescopu
A facile synthetic route using autogenerated air bubbles for the spontaneous formation of nanostructures
No full textVarious types of inorganic nanostructures including one-dimensional and nanocircle structures are prepared via simple solution mixing reaction. As confirmed by atomic force microscope (AFM) and transmission electron microscope (TEM), one-dimensional iron nanostrucutres with 1-10 nm in diameter as well as nanocircle with ca. 10 run of inner diameter are spontaneously formed upon mixing and shaking of aqueous solution of FeCl3 With ethanol followed by addition of aqueous hydroxylamine solution. Autogenerated nano-, mirco-sized air bubbles during the mixing of aqueous FeCl3 solution and ethanol are believed to play a critical role for the formation of nanostructures. (c) 2005 Elsevier B.V. All rights reserved.X119sciescopuskciothe
Preparation and functionalization of hydride terminated porous germanium
No full textPorous germanium (PG) is prepared by a novel bipolar electrochemical etching (BEE) technique; scanning electron microscopy (SEM) clearly reveals formation of a porous layer up to a few microns thick that is Ge-H-x terminated as indicated by FTIR spectroscopy; the hydride terminated PG material is quite resistant to oxidation, even under thermal conditions, but can be induced to undergo hydrogermylation reactions with alkenes and alkynes.X1137sciescopu
Carbon nanotube guided formation of silicon oxide nanotrenches
No full textThe potential applications of carbon nanotubes are varied(1-6). Although it has long been known that solid carbon can reduce SiO2 to its gaseous state at high temperatures(7), exploiting this reaction to pattern surfaces with carbon nanotubes has never been demonstrated. Here we show that carbon nanotubes can act as the carbon source to reduce (etch) silicon dioxide surfaces. By introducing small amounts of oxygen gas during the growth of single-walled carbon nanotubes (SWNTs) in the chemical vapour deposition (CVD) process, the nanotubes selectively etch one-dimensional nanotrenches in the SiO2. The shape, length and trajectory of the nanotrenches are fully guided by the SWNTs. These nanotrenches can also serve as a mask in the fabrication of sub-10-nm metal nanowires. Combined with alignment techniques, well-ordered nanotrenches can be made for various high-density electronic components in the nanoelectronics industry.X112122sciescopu
INOR 71-Carbon nanotube Schottky diode from asymmetric carbon nanotube-metal junctions induced by mass transport of lithium ions
No full textX11sciescopu
Effects of organic monolayer formation on electrochemiluminescence behavior of porous silicon
No full textThe effects of various organic monolayers on the surface of porous silicon on the electrochemiluminescence (ECL, also referred to as electroluminescence in the literature) characteristics were investigated. Surfaces were terminated with alkyne, alkene, and alkyl functionalities through cathodic electrografting (CEG), Lewis acid-mediated hydrosilylation (LA), and anodic electrografting (AEG), respectively. ECL was induced through the known formic acid/sodium formate electron injection system. Alkyl-terminated surfaces produced through AEG yielded the brightest emission of any of the functionalized surfaces although ECL emission was about half as intense as that from the underivatized Si-H-terminated surface. The lifetime, however, was extended by a factor of 2, and these surfaces demonstrate an unprecedented recharging phenomenon. When ECL ceases, a brief 10 s application of a cathodic bias restores most of the ECL emission intensity. This process can be cycled about 10 times, and results in a substantially greater light output than that from any of the surfaces examined here, including the Si-H-terminated surface. Dodecenyl-terminated surfaces, produced through Lewis acid-mediated hydrosilylation of 1-dodecyne, show the greatest lifetimes, an order of magnitude longer than that of an Si-H-terminated surface, but their emission intensity is unfortunately very low. The induction times for light emission to occur decreased for all the functionalized surfaces, as compared to the native Si-H surface. Explanations for the effects of organic monolayer formation on ECL observed here are described.X112324sciescopu
Positive and negative photopatterning of metal oxides on silicon via bipolar electrochemical deposition
No full textNegative and positive microscale patterning of metal oxides is efficiently and rapidly carried out on flat Si(100) surfaces via a simple white light assisted bipolar electrochemical process.open113sciescopu
Zinc phthalocyanine nanowire sensitizer for dual photodynamic and photothermal cancer therapy
No full textX11sciescopu
Mobile iron nanoparticle and its role in the formation of SiO2 nanotrench via carbon nanotube-guided carbothermal reduction
No full textThe detailed role of iron nanoparticles (NPs) involved with the formation of SiO2 nanotrenches is revealed. The physical movements of iron NPs, such as levitation and adsorption, turn out to be responsible for the initiation of carbothermal reduction (C (carbon nanotube, s) + SiO2(S) SiO(g) + CO(g)), which results in SiO2 nanotrenches that are fully guided by carbon nanotubes. Under the chemical vapor deposition condition with 0.1% of O-2 gas, iron NPs are liberally levitated from SiO2/Si substrate then adsorbed on the sidewalls of carbon nanotubes. Depending on the numbers of iron NPs attached to carbon nanotubes, two different types of nanotrenches are determined. When multiple iron NPs are assembled on carbon nanotubes and involved in carbothermal reduction, aligned nanohole type of nanotrenches is produced (Type I). On the contrary, when single iron NPs initiate the carbothermal reduction, nanotrenches having smooth pathways and high shoulders are commonly formed (Type II).X113sciescopu
Network single-walled carbon nanotube-field effect transistors (SWNT-FETs) with increased Schottky contact area for highly sensitive biosensor applications
No full textX11214217sciescopu
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