Enhancement of the structure, solar cells and vibrational studies of undoped CuCr2O4 and La-doped CuCr2O4 semiconductor compounds

Spinel CuB2O4 (B = Fe, Cr, and Al) Oxides for Selective Adsorption of Congo Red and Photocatalytic Removal of Antibiotics

“…Figure a shows the FTIR spectra of spinel CuAl 2 O 4 , CuCr 2 O 4 , and CuFe 2 O 4 oxides. For all samples, the broad peaks around 3442 and 1632 cm –1 are assigned to chemisorbed water. − For cubic CuAl 2 O 4 oxides, the characteristic peaks in the range 400–1120 cm –1 are associated with the vibrations of O–Cu, O–Al, and Cu–O–Al bonds. − For CuCr 2 O 4 oxides, the metal (M)–O vibration frequencies between 400 and 950 cm –1 are attributed to Cu–O, Cr–O, and Cu–O–Cr bonds. − The broad band below 600 cm –1 is ascribed to the vibration frequencies of M–O vibrations in CuFe 2 O 4 oxides. − The results further confirm that the CuB 2 O 4 oxides contain no other impurities.…”

“…The first absorption peak is related to the electron transitions of the O 2p and Al 3s orbitals. , The second absorption peak corresponds to the charge transfer of O to Cu 2+ occupied octahedral sites. , The last absorption peak is associated with the Cu 2+ d–d transitions . For the CuCr 2 O 4 oxides, the absorption peaks at 270 and 400–800 nm can be ascribed to the Cu 2+ ions in tetrahedral and octahedral symmetry. , For the CuFe 2 O 4 oxides, the absorption peaks at 270, 540, and 815 nm can be assigned to the electron transitions of occupied O 2– 2p states to the empty Fe 3+ 3d upper state. , …”

“…62 For the CuCr 2 O 4 oxides, the absorption peaks at 270 and 400−800 nm can be ascribed to the Cu 2+ ions in tetrahedral and octahedral symmetry. 44,63 For the CuFe 2 O 4 oxides, the absorption peaks at 270, 540, and 815 nm can be assigned to the electron transitions of occupied O 2− 2p states to the empty Fe 3+ 3d upper state. 64,65 The relationship between (αhν) 2 and photon energy (hν) for spinel CuAl 2 O 4 , CuCr 2 O 4 , and CuFe 2 O 4 oxides can be obtained by eq 6.…”

Identifikasi Fasa dan Informasi Kristal Nanopartikel Oksida Spinel CuCr2O4 Memanfaatkan Analisis XRD Berbasis Metode Rietveld Refinement

“…Nanokristal yang disesuaikan dengan jenis material yang dipilih dibuktikan memiliki aplikasi langsung di bidang biomedik, lingkungan, perminyakan, pengolahan limbah air, sampai penyimpanan energi berkelanjutan [2,3,4,5,6]. Tipe material yang memiliki keunggulan tersebut yakni komponen oksida spinel dengan rumus AB2O4, dengan A merupakan ion divalen dan B merupakan ion trivalen [7]. Spinel oksida berbasis krom yakni CuCr2O4 merupakan salah satu contoh material bertipe spinel karena keunggulannya seperti tidak bersifat toksik dan ekonomis dalam proses pembuatannya menarik perhatian agar dapat diaplikasikan lebih luas [8].…”

“…Pemilihan proses sintesis dari CuCr2O4 menjadi penting untuk diperhatikan agar dapat membentuk nanopartikel yang diharapkan. Salah satu tahapan yakni pemanfaatan basis prekursor menunjukkan bahwa pemanfaatan prekursor berbasis nitrat menghasilkan ukuran kristalit maupun partikel di skala nano melalui beragam metode sintesis, diantaranya yakni microwave method maupun facile synthesis [7,15]. Metode sintesis juga menyertakan keterlibatan faktor termal menunjukkan bahwa suhu termal pembentukan dari material CuCr2O4 berada di rentang suhu 600 o C [7,14,15].…”