Printing nanoparticles from the liquid and gas phases using nanoxerography
Printing nanoparticles from the liquid and gas phases using nanoxerography
复制标题
使用纳米静电印刷从液相和气相打印纳米颗粒
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
H. Jacobs
中科院分区：
文献类型：
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作者：
C. Barry;M. Steward;N. Z. Lwin;H. Jacobs
本文报道了纳米粒子在带电表面的定向自组装，其液相分辨率为200 nm，气相分辨率为100 nm。这种类型的纳米印刷所需要的带电区域是用一种平行的方法来制造的，这种方法使用一个柔性的、导电的电极来给薄膜驻极体充电。作为电极，我们使用了金属涂层聚合物邮票和10µm厚的掺杂硅片，上面带有地形图案。每个电极都与n掺杂硅衬底上的薄膜驻极体接触。通过在导电电极和硅衬底之间施加电压脉冲，将电荷模式转移到薄膜驻极体中。在10秒内以100纳米尺度分辨率绘制了1cm2大小的电荷图。这些电荷模式吸引纳米粒子。一种液相组装工艺，其中静电力与超声引起的无序力竞争，在10秒内从液体悬浮液中将纳米颗粒组装到带电受体上。开发了一种气相组装工艺，该工艺使用透明颗粒组装模块将颗粒引导到带电表面，同时监测组装颗粒的总电荷。纳米颗粒是在管状炉上通过出口蒸发和冷凝产生的。静电定向组装10-100纳米尺寸的金属（金、银）和30纳米尺寸的碳颗粒，其分辨率比现有静电打印机的分辨率高500-1000倍。
This paper reports on the directed self-assembly of nanoparticles onto charged surface areas with a resolution of 200 nm from the liquid phase and 100 nm from the gas phase. The charged areas required for this type of nanoxerographic printing were fabricated using a parallel method that employs a flexible, electrically conductive, electrode to charge a thin-film electret. As electrodes, we used metal-coated polymeric stamps and 10 µm thick doped silicon wafers carrying a pattern in topography. Each electrode was brought in contact with a thin-film electret on an n-doped silicon substrate. The charge pattern was transferred into the thin-film electret by applying a voltage pulse between the conductive electrode and the silicon substrate. Areas as large as 1 cm2 were patterned with charge with 100 nm scale resolution in 10 s. These charge patterns attract nanoparticles. A liquid-phase assembly process where electrostatic forces compete with disordering forces due to ultrasonication has been developed to assemble nanoparticles onto charged based receptors in 10 s from a liquid suspension. A gas-phase assembly process was developed that uses a transparent particle assembly module to direct particles towards the charged surface while monitoring the total charge of assembled particles. Nanoparticles were generated using a tube furnace by evaporation and condensation at the outlet. The electrostatically directed assembly of 10–100 nm sized metal (gold, silver) and 30 nm sized carbon particles was accomplished with a resolution 500–1000 times greater than the resolution of existing xerographic printers.