Scalable nano-particle assembly by efficient light-induced concentration and fusion.
Scalable nano-particle assembly by efficient light-induced concentration and fusion.
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DOI：
10.1364/oe.16.017276
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发表时间：
2008-10
期刊：
影响因子：
3.8
通讯作者：
B. Wilson;M. Hegg;X. Miao;G. Cao;Lih Y. Lin
中科院分区：
文献类型：
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作者：
B. Wilson;M. Hegg;X. Miao;G. Cao;Lih Y. Lin
雪崩浓度是液体样品中激光点周围粒子快速、长距离的积累，已针对各种纳米颗粒 (NP) 进行了演示和表征。该效应是由样品中的对流驱动的，这是由具有高吸收效率的纳米粒子的有效加热引起的。观察并表征了几种类型的集中行为。发现控制光功率和初始粒子密度对于确定组装过程是有效的。将 VO(2) 纳米线、碳纳米管 (CNT) 和量子点 (QD) 电极间隙桥组装成各种尺寸和几何形状，以展示纳米组装方法的实用性。桥由多达数千个至少至一个 NP 组装而成，并且通过测量电流-电压 (I-V) 特性进行验证，发现电极之间形成了牢固的电接触。
Avalanche concentration, a rapid, long-range accumulation of particles around a laser spot in a liquid sample, is demonstrated and characterized for various nanoparticles (NPs). The effect is driven by a convective flow in the sample, caused by efficient heating of NPs with high absorption efficiencies. Several types of concentration behavior were observed and characterized. Control of optical power and initial particle density was found to be effective in determining the assembly process. VO(2) nanowires, carbon nanotube (CNT), and quantum dot (QD) electrode gap bridges were assembled with a variety of sizes and geometries to show the utility of the method for nano-assembly. Bridges were assembled from as many as thousands to as few as one NP and were found to form solid electrical contact between the electrodes, as verified by measuring the current--voltage (I-V) characteristic.