Large-Area Synthesis and Microstructural Investigations of Silicon Nanowires and Te/Bi2Te3-Si Core-Shell Structures

Inn Khuan Ng; Kok Kuan Ying; Siti Salwa Zainal Abidin; Nur Ubaidah Saidin; Thye-Foo Choo

doi:10.4028/www.scientific.net/AMR.364.243

Paper Titles

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Dressing of Mwcnts with TiO₂ Nanoparticles Using Modified Microwave Method
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The Effect of Catalyst on Carbon Nanotubes (CNTs) Synthesized by Catalytic Chemical Vapor Deposition (CVD) Technique
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Preparation and Characterizations of In_0.1Sn_xZn_0.85-2xS Powder Photocatalysts for Hydrogen Production under Visible Light Irradiation
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Large-Area Synthesis and Microstructural Investigations of Silicon Nanowires and Te/Bi₂Te₃-Si Core-Shell Structures
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The Effect of Calcinations Temperature on the Performance of TiO₂ Aggregates-Based Dye Solar Cells (DSCs)
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The Effect of Nanoseed Concentration on the Aspect Ratio of Gold Nanorod
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Butane Sensing Property of Si-ZnO Nanowires p-n Junction
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Synthesis and Characterization of Silicotungstic Acid Nanoparticles via Sol Gel Technique as a Catalyst in Esterification Reaction
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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 364Large-Area Synthesis and Microstructural...

Large-Area Synthesis and Microstructural Investigations of Silicon Nanowires and Te/Bi₂Te₃-Si Core-Shell Structures

Abstract:

Large-area randomly-oriented silicon nanowires (SiNWs) were synthesized using Au-coated p-type Si (100) substrates via the solid-liquid-solid (SLS) process under different growth conditions. Microstructural studies on the NWs produced showed that straight crystalline nanowires of large aspect ratios were generally obtained at a growth temperature of 1000°C along with some worm-like amorphous structures. Large-area vertically aligned silicon nanowire (SiNW) arrays on p-type (001) Si substrates were also synthesized in an aqueous solution containing AgNO₃ and HF by self-selective electroless etching. Diameters of the SiNWs produced from both methods varied from 50 nm to 350 nm and their lengths generally extended from several to approximately a few tens of µm depending on the growth conditions used. Te-Si and Bi₂Te₃-Si core-shell structures were subsequently obtained via galvanic displacement of SiNWs in acidic HF electrolytes containing HTeO₂⁺ and Bi³⁺/HTeO₂⁺ions. The reactions were basically a nanoelectrochemical process due to the difference in redox potentials between the materials. The modified SiNWs of core-shell structures had roughened surface morphologies and, therefore, higher surface-to-bulk ratios compared to unmodified SiNWs. They should have potential applications in sensors, photovoltaic and thermoelectric nanodevices. Microstructural studies on the SiNWs and core-shell structures produced are presented using various microscopy, diffraction and probe-based techniques for characterization.