2019年10月30日 · Boron nitride nanotubes (BNNTs) share some fundamental similarities in atomic structure with carbon nanotubes (CNTs) in which sp 2 hybridized boron and nitrogen atoms...

2024年9月27日 · Lowering the synthesis temperature of boron nitride nanotubes (BNNTs) is crucial for their development. The primary reason for adopting a high temperature is to enable the effective activation of high-melting-point solid boron.

2018年6月28日 · In this review, we will present BNNT synthesis methods that are currently widely used, and applications of BNNTs in various area. BNNT has been synthesized mainly by methods that have been well documented earlier for CNT fabrication including arc discharge [27], chemical vapor deposition (CVD) [28], laser ablation [29], etc.

Based on our density functional theory-based molecular dynamic simulations of BNNT nucleation, AlB x (x = 1.5 to 2) shows catalytic activity for the formation of BN chains and BN six-membered rings. Confirmatory experiments demonstrate that AlB 2 …

2015年6月1日 · Most of arc discharge and CVD methods to synthesize BN nanotubes were based on VLS growth. CVD typically utilized precursor vapors, e.g. borazine [36] or BO x, and metal catalysts (usually in liquid forms under growth conditions) for growing solid-state BN nanotubes.

2022年3月1日 · In BOCVD, boron powder reacts with metal oxides (e.g., MgO [93], Li 2 O [13], and Fe 2 O 3 94,95) at high temperature to generate B 2 O 2 vapor, which then reacts with the nitrogen source (NH 3, N 2) to generate BNNTs based on …

2010年9月26日 · Cylinder- and bamboo-shaped boron nitride nanotubes (BNNTs) have been synthesized in large scale via a facile chemical vapor reaction route using ammonia borane as a precursor.

at UC Berkeley in the mid 1990’s, the boron nitride nanotube (BNNT) has proven very difficult to make until now. Herein we provide an update on a catalyst-free method for synthesizing highly crystalline, small diameter BNNTs with a high aspect ratio using a high power laser under a high pressure and high temperature environment first discovered

2024年11月8日 · 氮化硼纳米管 (BNNT)是一种具有优异物理和化学性质的一维管状纳米材料。 其卓越的性能包括高机械强度、轻量化、耐高温、强界面结合以及优良的电绝缘性。 这些特性赋予BNNT在热界面材料、耐高温材料、辐射屏蔽材料和深紫外发射器等领域广泛的应用潜力。 然而，BNNT的高生产成本限制了其在上述领域的研究进展。 由于目前的合成温度高达1100–8000 °C，极大地增加了设备的复杂性和能耗，降低合成温度成为减少生产成本的关键。 因此，深 …

根据 k、l 的取值不同即可获得三种类型的单壁BNNTs： 扶手椅型 (k=l， θ=30°， armchair) (如图1.2中 (b))、锯齿形 (l=0，θ=0°，zigzag) (如图1.2中 (c))和手性型 ( (k，l)， 0＜θ＜30°，chiral) (如图 1.2中 (d))。 多壁 BNNTs 可以通过几个至几十个单壁的BNNTs 构成，管间距约为0.34nm，基本与h-BN (002)晶面层间距一致。 此外，由于BNNTs层与层之间具有比较强的作用力，因此 BNNTs以多壁管居多。 此外， BNNTs 的结构与 CNTs 的结构差异之处还表现在二者的端帽 …