Lanthanum Telluride Nanowires: Formation, Doping, and Raman Studies

Abstract

A new approach for the synthesis of freely dispersible one-dimensional (1D) lanthanum telluride nanowires (La 2 Te 3 NWs) in the solution phase is reported. The process involves a reaction between tellurium nanowires (Te NWs) and lanthanum nitrate (La(NO 3 ) 3 ) at room-temperature. Te NWs act as templates for the formation of La 2 Te 3 NWs. The aspect ratio of the as prepared La 2 Te 3 NWs is the same as the parent Te NWs. Various microscopic and spectroscopic tools such as HRTEM, SEM, EDAX, XRD, XPS, Raman, UV-visible, and fluorescence were used for the characterization of the NWs. A new surface enhanced Raman active substrate was synthesized by doping silver in La 2 Te 3 NWs. Surface enhanced Raman spectra were studied using crystal violet (CV) as the analyte. Raman features have been observed up to a concentration of 10 -8 M of CV. Different concentrations of Ag in Ag-doped La 2 Te 3 NWs were investigated. The monodispersity, homogeneity, and Raman enhancement properties of the NWs, synthesized through a simple solution phase protocol, are expected to motivate further studies on this material.

Facile hydrothermal synthesis of AgPb10LaTe12 materials: controlled synthesis, growth mechanism and shape-dependent electrical transportation properties

“…The binding energies 835.0 and 851.2 eV for the main peaks and 838.1 and 855.5 eV for the satellite peaks certify the existence of La in the +3 oxidation state as reported. 27 The existence of weaker satellite peaks is considered to be due to the charge transfer process, in which an electron transfers from O 2p to the empty 4f shell of La leading to the 3d 9 4f 1 final state. 28 Fig.…”

Insight into mechanisms of fluoride removal from contaminated groundwater using lanthanum-modified bone waste

“…These satellite peaks were observed due to the transfer of an electron from O 2p to the empty 4f shell of La, leading to the 3d 9 4f 1 nal state. 43 These results conrm the presence of R-La-OH, La 2 O 3 or La(OH) 3 . It is found that the binding energies of all peaks of La 3d shied to the higher binding energy side aer uoride adsorption, which was ascribed to the fact that the electronegativity of uoride ions (3.98) was more than chloride ions (3.16).…”

A new generation of alloyed/multimetal chalcogenide nanowires by chemical transformation

“…Recently, uniform Ag 2 Se nanowires ( 23 , 24 ) and CdSe nanotubes ( 25 ) have been simply synthesized through the CT of selenium (Se) nanowires. A variety of metal telluride nanowires, including PbTe ( 26 ), CdTe ( 27 ), Bi 2 Te 3 ( 28 ), Ag 2 Te ( 29 ), and La 2 Te 3 ( 30 ), have been reported to be converted from tellurium (Te) nanowires. However, the synthesis of 1D metal chalcogenide alloy and hybrid nanostructures by CT has rarely been reported to date.…”