DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2014 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

TT: Fachverband Tiefe Temperaturen

TT 81: Superconductivity: Properties and Electronic Structure

TT 81.8: Talk

Thursday, April 3, 2014, 11:30–11:45, HSZ 201

Electrospun superconducting La1.85Sr0.15CuO4 nanowires and nanoribbons — •XianLin Zeng1, Michael R. Koblischka1, Jennifer S. Atchinson2, Volker Presser2, and Uwe Hartmann11Institute of Experimental Physics, Saarland University, Campus C 6 3, 66123 Saarbrücken, Germany — 2INM – Institute of New Materials Saarbrücken, Campus D 2 2, 66123 Saarbrücken, Germany

The synthesis of high-temperature superconducting La1.85Sr0.15CuO4 nanostructures via electrospinning and a subsequent calcination in air and oxygen is reported. Nanowire and nanoribbon structures are obtained in the experiments with a maximum Tc,onset of  20 K. According to the morphological characterization via scanning electron microscopy (SEM) and transmission electron microscopy (TEM), the nanowires have average diameters of about 230 nm and the length spans more than 30 µm. The nanowires are polycrystalline with a mean grain size of about 110 nm and 30 nm as determined by TEM and X-ray analysis, respectively. The nanoribbons are about 0.5 to 1 µm wide but show a thickness of only 60 to 80 nm, which indicates that the ribbons have a monolayer crystal structure. A confirmation of the chemical phase and component ratio is given by X-ray diffraction and EDX measurements. Attempts are made to achieve a detailed understanding of the formation of nanowires and -ribbons. Furthermore, additional information concerning the symmetry breaking of two phonon modes is obtained via Raman spectra of the nanowires, confirming the previous results presented in [1].
J. M. Li, X. L. Zeng, et al., Cryst. Eng. Comm. 13, 6964 (2011)

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2014 > Dresden