Growth of SiO x Nanowires on Self-assembled Hexagonal Au Particle Networks
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Growth of SiOx Nanowires on Self-assembled Hexagonal Au Particle Networks Tian Fu Chiang1, Shao Liang Cheng2 and Lih Juann Chen1 1 Department of Material Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan, R. O. C. 2 Department of Chemical and Materials Engineering, National Central University, Chung-Li City, Taiwan, R.O.C. ABSTRACT Self-assembled hexagonal networks with discrete Au particles on Al2O3 (00·1) and Si (111) have been synthesized. SiOx nanowires were grown on individual Au particles using a vapor transport deposition process. The growth of SiOx nanowires was found to cover completely the surface of Au particles on Al2O3 (00·1). On the other hand, the SiOx nanowires were grown selectively on Au particles on Si (111). Interaction of Au and Si substrate is invoked to explain the difference. INTRODUCTION In recent years, one-dimensional (1D) nanostructures, including nanotubes [1,2], nanowires [3-5], and nanorods [6-7], are attracting much interest because they are expected to play an important role in nanometer-scale electronics and optoelectronics. Among the 1D nanostructures, the silica nanowires possess considerable technological promise owing to their potential applications in the high-resolution optical heads of scanning near-field optical microscopes and future nano-interconnection integrated optical devices [8]. However, in order to realize these practical devices, a high degree of precision regarding site control, orientation, composition and shape of the nanowires has to be attained. Thus well-ordered arrays of catalytic metal nanoparticles, often gold, become important for the device applications. The nano arrays have been synthesized using different methods, such as nanochannel alumina template [9], atom force microscope (AFM) manipulation [10] and electron beam lithography (EBL) [11]. In addition, many two-dimensional (2-D) arrays of metal nanoparticles by self-assembly were successfully formed. Self-assembly is herein defined as the autonomous organization of components into patterns or structures without artificial intervention [12]. It has been reported that using self-assembled colloidal polystyrene latex as a mask, nanosphere lithography (NSL) method has shown the promise to replace the traditional photolithography and EBL [13]. In a previous work, novel self-assembled hexagonal Au particle networks, 2-12 µm in cell size, on silicon from have been achieved by a simple method [14]. Using this method, self-assembled hexagonal Au particle networks on different substrates have been achieved and serve as catalytic seeds. In the present study, well-defined growth of the SiOx nanowires at the self-assembled hexagonal Au particle networks has been achieved using a vapor transport method with solid Si source.
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EXPERIMENTAL PROCEDURES Honeycomb structure of Au nanoparticles on different substrates, including Al2O3 (00·1) and Si (111), was drop-cast from the Au nanoparticle solution with appropriate concentration, evaporation rate, substrate temperature and h
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