Needle-shaped silicon carbide nanowires: Synthesis and field electron emission properties

Abstract

Bunches of needle-shaped silicon carbide (SiC) nanowires were grown from commercially available SiC powders in thermal evaporation process and using iron as catalyst. Their structure and chemical composition were studied by Raman spectroscopy and high-resolution transmission electron microscopy. The powder of these nanowires may be easily dispersed, and was used to form samples of field electron emitters. The needle shape of individual nanowires is well-suited to field electron emission. Stable emission with current density of 30.8 mA/cm2 was observed at fields as low as 9.6 V/μm, and current density of up to 83 mA/cm2 was recorded.

Структурные И Оптические Свойства Нанонитей Карбида Кремния, Полученных Высокотемпературной Карбидизацией Кремниевых Наноструктур

“…К другим ин-тересным свойствам наноструктур SiC можно отнести наличие автоэлектронной эмиссии, порог и свойства которой сопоставимы с характерными для углеродных нанотрубок [4]. Эти и многие другие свойства делают наноструктуры карбида кремния крайне привлекатель-ными для исследования.…”

“…В последнее время проявляется огромный интерес к наноструктурам SiC, полученным различными мето-дами, в том числе электрохимическим травлением [5], твердофазной эпитаксией [6,7], методами пар-жидкость-твердое тело (VLS) [4] или химического осаждения из газовой фазы (CVD) [8]. Особый интерес представляет формирование SiC с использованием в качестве затравки наноструктур кремния, таких как слои пористого крем-ния (por-Si) и кремниевые нанонити (Si-NW), интенсив-но исследуемые в последнее время [9,10].…”

Diverse Role of Silicon Carbide in the Domain of Nanomaterials

“…Nanoscale engineering of this material allows considerable extension of its basic physicochemical properties. For example, SiC nanostructures have shown greater elasticity and strength than bulk SiC [60], and SiC nanowires have an electron field emission threshold comparable to that of a carbon nanotube-based material as well as stable emission properties [55]. Niu and wang [61] recently reported an application of SiC nanowires covered with platinum as an efficient electrocatalyst for hydrogen adsorption/desorption and methanol oxidation.…”

“…SiC nanowires have been shown to have stable field electron emission properties [54,55], suggesting that the materials have potential as field electron emitters. The heterostructures of single-walled carbon nanotubes and silicon carbide nanorods [56] may play an important role in future hybrid nanodevices.…”

Field-Emission Characteristics of the Densified Carbon Nanotube Pillars Array

“…The field emitters provide cold electrons to bombard phosphors in an anode plate to generate high luminance. In the last decade, various one-dimensional (1D) nanomaterials with high aspect ratio have been intensively investigated for field emitter arrays (FEAs) [1][2][3] Among these candidates, carbon nanotubes (CNTs) [4][5][6][7][8][9] have attracted a great deal of attention as an electron-emitting material owing to their high aspect ratio, high thermal conductivity, large current capability, chemical inertness, and high mechanical strength. 10 In general, the field-emission (FE) characteristics for an individual CNT are considered to be better than that for the CNT films because of avoiding the screen effect.…”