Abstract
The trivalent Eu(III) ion exhibits unique red luminescence and plays an significant role in the display industry. Herein, the amperometry electrodeposition method was employed to electrodeposit Eu(III) materials on porous Si and terpyridine-functionalized Si surfaces. The electrodeposited materials were fully characterized by scanning electron microscopy, X-ray diffraction crystallography, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy. Photoluminescence (PL) spectroscopy revealed that PL signals were substantially increased upon deposition on porous Si surfaces. PL signals were mainly due to direct excitation and charge-transfer-indirect excitations before and after thermal annealing, respectively. The as-electrodeposited materials were of a Eu(III) complex consisting of OH, H2O, NO3−, and CO32− groups. The complex was transformed to Eu2O3 upon thermal annealing at 700 °C. The electrodeposition on porous surfaces provide invaluable information on the fabrication of thin films for displays, as well as photoelectrodes for catalyst applications.
Highlights
Porous silicon (PS) is known to show unique physicochemical properties and a high surface area [1,2,3,4,5]
The pores have commonly been prepared by electrochemical anodization process in a hydrofluoric acid (HF) solution by varying many experimental parameters such as concentration, organic-solvent additive, time, and applied potential [6,7]
Electrodeposition of an Eu(III) complex was successfully demonstrated on porous Si and terpyridine-functionalized porous Si surfaces by amperometry
Summary
Porous silicon (PS) is known to show unique physicochemical properties and a high surface area [1,2,3,4,5]. Ortaboy et al synthesized MnOx-decorated carbonized porous Si nanowire, and showed that the PS nanowire-based pseudocapacitor electrode had a specific capacitance of 635 F g−1, areal power of 100 mW cm−2, and energy of 0.46 mW h cm−2 [17] They reported a power density of 25 kW kg−1 and an energy density of 261 W h kg−1 at 0.2 mA/cm, and a large potential window of 3.6 V. Yaghoubi et al prepared a PS by the electrochemical etching method and modified with lectins via aminosilane functionalization followed by glutaaldehyde incubation [20] They demonstrated that a lectin-conjugated PS showed good biosensing performances for label-free and realtime detection of Escherichia coli and Staphylococcus aureus by reflectometric interference Fourier transform spectroscopy
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