Abstract
A direct and simple oneβstep hydrothermal reaction route has been developed for the synthesis of high quality trigonal selenium (tβSe) nanowires at 110 Β°C, with (NH~4~)~2~S~2~O~3~ and Na~2~SeO~3~ as starting materials in the presence of the surfactant sodium dodecyl sulfate (SDS). The diameter of the trigonal selenium nanowires can be tuned by carefully adjusting the initial feedstock concentration. The unusual chain like structure of the target material plays a key role in determining the final morphologies of the products. Several factors, such as initial concentration of the feedstock, the presence of surfactant, and the temperature which influences the quality of the tβSe nanowires, have been investigated. The optical properties of the tβSe nanowires with different diameters were examined by means of UV/Vis absorbance spectroscopy at room temperature. The investigation revealed that the absorbance peak for the tβSe nanowires with diameters of 20β40Β nm shifts to the blue, relative to those for bulk tβSe nanowires (374Β nm) and nanowires with diameters of 50β130Β nm (306Β nm). (Β© WileyβVCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)