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Field emission from single-walled carbon nanotube (SWNT) nonwoven has been
investigated under high vacuum with different vacuum gaps. A low turn-on
electric field of 1.05\,V/$\mu $m is required to reach an emission current
density of 10 $\mu $A/cm$^{2}$. An emission current density of 10
mA/cm$^{2}$ is obtained at an operating electric field of 1.88\,V/$\mu $m. No
current saturation is found even at an emission current of 5\,mA. With the
vacuum gap increasing from 1 to 10 mm, the turn-on field decreases
monotonically from 1.21 to 0.68\,V/$\mu $m, while the field amplification is
augmented. The good field-emission behaviour is ascribed to the combined
effects of the intrinsic field emission of SWNT and the waved topography of
the nonwoven. 相似文献
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Growth of aligned single-walled carbon nanotubes under ac electric fields through floating catalyst chemical vapour deposition 下载免费PDF全文
Through floating catalyst chemical vapour deposition(CVD) method,well-aligned isolated single-walled carbon nanotubes (SWCNTs) and their bundles were deposited on the metal electrodes patterned on the SiO2/Si surface under ac electric fields at relatively low temperature(280℃). It was indicated that SWCNTs were effectively aligned under ac electric fields after they had just grown in the furnace.The time for a SWCNT to be aligned in the electric field and the effect of gas flow were estimated. Polarized Raman scattering was performed to characterize the aligned structure of SWCNTs. This method would be very useful for the controlled fabrication and preparation of SWCNTs in practical applications. 相似文献
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Seed-mediated growth of gold nanoparticles using self-assembled monolayer of polystyrene microspheres as nanotemplate arrays 下载免费PDF全文
Arrays of noble metal nanoparticles show potential applications in (bio-)sensing,
optical storage, surface-enhanced spectroscopy, and waveguides. For all such
potential devices, controlling the size, morphology, and interparticle spacing of
the nanoparticles is very important. Here, we combine seed-mediated growth with
nanosphere lithography to study the controllable growth of gold nanoparticles (Au
NPs), in which the self-assembly monolayer of polystyrene (PS) on a silicon surface
is used to guide the modification of alkanesilanes and the subsequent adsorption of
gold seeds; seed-mediated growth is applied to controlling the morphology and size
of Au NPs. The size of adsorption region (determining the number of adsorbed gold
seeds) is controlled by etching PS microspheres with oxygen plasma or annealing PS
microspheres at the glass transition temperature. The size and morphology of the Au
NPs are controlled by changing growth conditions. In such a way, we have achieved
the dual control of the obtained Au NPs. Preliminary results show that this strategy
holds a great promise. This approach can also be extended to a wide range of
materials and substrates. 相似文献
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利用光刻,反应离子刻蚀以及电化学阳极氧化技术在铝基底上构建出了微米纳米相结合的三维金属铝图案。首先在铝片的表面形成一层具有图案的二氧化硅阻碍层,阳极氧化过程中,在二氧化硅阻碍层之下会形成侧向生长的倾斜孔道和残留的金属铝微结构。形成机制可阐述为:由于表面二氧化硅阻碍层的存在造成局域电场方向的偏折,影响到反应过程中离子的输运,从而导致侧向倾斜孔的形成,而在远离阻碍层的区域孔道则会正常垂直表面向下生长。这种垂直与侧向阳极腐蚀的同时进行导致在二氧化硅阻碍层之下形成了金属铝微结构。 相似文献
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