Soft Lithographic Approach to the Fabrication of Highly Ordered 2D Arrays of Magnetic Nanoparticles on the Surfaces of Silicon Substrates
Soft Lithographic Approach to the Fabrication of Highly Ordered 2D Arrays of Magnetic Nanoparticles on the Surfaces of Silicon Substrates
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DOI：
10.1021/la001211k
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发表时间：
2000-12
期刊：
影响因子：
3.9
通讯作者：
Z. Zhong;and Byron Gates;Younan Xia;D. Qin
中科院分区：
文献类型：
--
作者：
Z. Zhong;and Byron Gates;Younan Xia;D. Qin
本文描述了一种简单方便的方法，使用图案化单层作为模板来制造横向尺寸在 70−460 nm 范围内的高度有序的二维磁性颗粒阵列（Co、Ni 或 α-Fe，以及铁氧体，如 MgFe2O4 或 NiFe2O4）。在此方法中，Si/SiO2 晶片的亲水性羟基封端表面通过弹性体印模的微接触印刷，用十八烷基三氯硅烷的疏水性单层进行图案化，随后用作模板来定义和沉积包含无机盐（例如 Co(NO3)2、Ni(NO3)2 和 Fe(NO3)3 或这些化合物的组合的 2-丙醇液滴的规则二维阵列。溶剂的蒸发导致在 Si/SiO2 的亲水性裸露区域上形成二维硝酸盐纳米颗粒阵列。通过将基板从硝酸盐溶液中取出并让溶剂蒸发，并将晶片保持在指定的位置，每个纳米颗粒都可以很好地定位在亲水区域内。
This paper describes a simple and convenient method that uses patterned monolayers as templates to fabricate highly ordered 2D arrays of magnetic particles (Co, Ni, or α-Fe, and ferrites such as MgFe2O4 or NiFe2O4) with lateral dimensions in the range of 70−460 nm. In this method, the hydrophilic, hydroxyl-terminated surface of a Si/SiO2 wafer was patterned with a hydrophobic monolayer of octadecyltrichlorosilane using microcontact printing with an elastomeric stamp and subsequently used as template to define and deposit a regular 2D array of 2-propanol droplets that contained inorganic salts such as Co(NO3)2, Ni(NO3)2, and Fe(NO3)3, or a combination of these compounds. Evaporation of the solvent led to the formation of a 2D array of nitrate nanoparticles on the hydrophilic, bare regions of Si/SiO2. Each nanoparticle could be well-positioned within the hydrophilic region by withdrawing the substrate from the nitrate solution and by letting the solvent evaporate with the wafer being held at a specified ori...