Photoluminescence and X-ray diffraction studies on Cu2O

Formation of CuO nanorods and their bundles by an electrochemical dissolution and deposition process

“…It is noted that the peak centered at 430 nm (2.89 eV), which indicates Cu emission, did not appear in the annealed sample [11]. The PL peak located at 685 nm (1.81 eV) is related to the interstitial in CuO whereas the peak of 714 nm (1.74 eV) is related to the recombination of electrons and holes at oxygen vacancies [32][33][34][35]. However, the increase in PL intensity with increasing annealing temperature may be the result of a grain size growth and a crystallinity improvement, which is confirmed by TEM images (Fig.…”

Morphology transformation of Cu2O sub-microstructures by Sn doping for enhanced photocatalytic properties

“…X-ray photo-electron spectroscopy (XPS) was performed on a Thermo ESCALAB 250XI electron spectrometer equipped with Al K α X-ray radiation (hν =1486.6 eV) as the source for excitation. be ascribed to the increase of the disordered structures and defects induced by Sn doping [25,26,43,44]. The peak at 422 cm -1 and 800 cm -1 were assigned to four-phonon mode 3Γ -12 +Γ -25 and a second order (2) 15 , respectively [24][25][26].…”

“…Meanwhile, the structure, chemical stability, and growth mechanism of as-prepared Cu 2 O are also well investigated to reveal the photocatalytic mechanism and to control the growth process, which may play an important role on the photodegradation application [19][20][21][22][23][24][25][26]. However, two crucial factors hindered the developments of semiconductor photocatalysts: recombination of photogenerated hole-electron pairs [27] and photocorrosion [28,29].…”

Cu2O epitaxial films with domain structures prepared on Y-stabilized ZrO2 substrates by pulsed laser deposition

“…and 629 cm -1 are referred to one fourth order overtone 4Γ "# $ and one red allowed mode Γ "% $ # (TO) [29], respectively. For the sample grown at 0.02, the presence of Cu particles could not be ascertained from µRS due to instrumental limitations for metals because they can exhibit surface plasmon resonance (SPR).…”

“…crystal [28,29], respectively. The most intense peak at 221 cm -1 is the second order overtone of Cu 2 O, corresponding to 2Γ "# $ mode [28,29]. The other two peaks at 416…”