Surfactant-resisted assembly of Fe-containing nanoparticles for site-specific gr

2019-09-01 08:04:52

growth silicon nanoparticles oxide nanodomains

责任者: He, Maoshuai;Ling, Xing;Zhang, Jin;Liu, Zhongfan 单位: Key Laboratory for the Physics and Chemistry of Nanodevices, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China 来源出处: Journal of Physical Chemistry B,2005,109(21):10946-10951 摘要: This paper describes a facile approach to the site-specific growth of single-walled carbon nanotubes (SWNTs) on silicon surfaces by chemical vapor deposition (CVD). The approach is based on the use of a surfactant as a resist to define patterns of silicon oxide nanodomains onto which nanoparticles of iron hydroxide (Fe-(OH)3), 1-5 nm diameter, could be deposited. In base growth mode, the SWNTs can grow from the oxide nanodomains. By controlling the location of oxide nanodomains, site-specific growth could be obtained. The iron hydroxide nanoparticles were prepared by hydrolysis of ferric chloride (FeCl3). Patterned hydroxylated silicon oxide nanodomains were created by scanning probe oxidation (SPO) of silicon substrates modified with aminopropyltrimethoxysilane (APTMS, H2N(CH2) 3Si(OCH3)3). Due to electrostatic interaction, Fe(OH)3 nanoparticles can be selectively deposited on hydroxyl groups present on silicon oxide nanodomains. To inhibit the assembly of the nanoparticles on a APTMS-coated silicon surface, sodium dodecyl sulfate (SDS) was introduced, which restricted deposition to the hydroxylated nanodomains. A model mechanism for the selective deposition mechanism has been proposed. It was possible to convert the patterned Fe(OH)3 nanoparticles to iron oxide, which served as a catalyst for the site-specific growth of SWNTs. Raman spectroscopy and AFM were used to characterize the nanotubes on the Si substrate. This will offer the possibility for future integration with conventional microelectronics as well as the development of novel devices. © 2005 American Chemical Society. 关键词: Nanostructured materials;Carbon nanotubes;Surface active agents;Iron;Assembly;Growth (materials);Silicon;Chemical vapor deposition;Hydrolysis;Oxidation;Atomic force microscopy;Nanoparticles;Surfactant-resisted assembly;Single-walled carbon nanotubes (SWNT);Nanodomains