Porous Silicon and Alumina as Chemically Reactive Templates for the Synthesis of Tubes and Wires of SnSe, Sn, and SnO₂.

Abstract

Nanotechnology V 1505Porous Silicon and Alumina as Chemically Reactive Templates for the Synthesis of Tubes and Wires of SnSe, Sn, and SnO2. -The selective reactivity of the pore walls of porous alumina and macroporous silicon allows the preparation of monodisperse tubes and nanowires of SnSe, SnO2, and Sn from a single-source precursor, Sn(SePh)4. For a given template system, the reduction or oxidation is initiated easily by increasing the temperature to about 650°C. The enhanced reaction temperature for the oxidation within the pores facilitates the formation of single-crystalline nanowires of SnO2. -(ZHAO, L.; YOSEF, M.; STEINHART, M.; GOERING, P.; HOFMEISTER, H.; GOESELE, U.; SCHLECHT*, S.; Angew. Chem., Int. Ed. 45 (2006) 2, 311-315; Inst. Chem.

Unprecedented New Crystalline Forms of SnSe in Narrow to Medium Diameter Carbon Nanotubes

“…From previous studies, 13,15 enhanced thermoelectric properties would be anticipated, which is the subject of ongoing investigations in this laboratory. Indeed, while mesoscale SnSe nanotubes 180−400 nm in cross-section have been formed inside alumina templates, 49 theoretical studies by Lin and co-workers predict that forming smaller "starlike" SnSe nanotubes at a slightly larger scale than our nanostructures (i.e., with an outer diameter of ∼2 nm) considerably enhances their thermoelectric performance. 50 Given the conformation options afforded by the confining diameter range of the novel SnSe structure, it is possible to filter out the metal SWCNTs and still be left with a substantial volume of the new structure encapsulated inside semiconducting SWCNTs.…”

High-Performance Near-Infrared Photodetectors Based on p-Type SnX (X = S, Se) Nanowires Grown via Chemical Vapor Deposition

“…Particularly, Shen et al developed a rapid synthesis technique for SnSe NWs using an ethylenediamineassisted polyol but accompanyied with a low yield. 26 Likewise, Zhao and his team achieved the synthesis of polycrystalline SnSe NWs with high yields by utilizing a template-assisted approach, 27 while Liu et al could significantly enhance the crystallinity of SnSe NWs with a diameter down to 20 nm via a combination of solution-phase synthesis and a seed-inducing method. It is noted that the prepared SnSe NWs could be reliably controlled in length with significant quantum confinement effects; however, the employed synthetic method was rather complex, and toxic reagents were used in the NW growth.…”

Electrochemical route to thermoelectric nanowires via organic electrolytes

“…Furthermore, the compounds investigated in this work exhibit a tendency to oxidize and the anodized alumina membranes are likely to promote that oxidation process. The oxidation of embedded nanowires in an AAO template during heat treatment had already been shown by Zhao et al [23] on zinc selenide nanowires. Additionally during a chemical analysis performed by X-ray fluorescence we found copper and iodine in the nanowires which remained from the synthesis of the AAO membranes and the used electrolytes, respectively.…”