Carbon quantum dots (C QDs)/p-type CuAlO2/n-type ZnO photoelectric bilayer film composites were prepared by a simple route, through which ZnO films were sputtered on crystal quartz substrates and CuAlO2 films were prepared by sol-gel on ZnO films and then these bilayer films were composited with C QDs on their surface. The characterization results indicated that C QDs were well combined with the surface of the CuAlO2 films. The photovoltage and photocurrent of these bilayer film composites were investigated under illumination and darkness switching, which demonstrated to be significantly enhanced compared with those of the CuAlO2/ZnO bilayer films. Through analysis, this enhancement of the photoconductivity was mainly attributed to C QDs with unique up-converted photoluminescence behavior.
Carbon quantum dots (C QDs)/p-type CuAlO2/n-type ZnO photoelectric bilayer film composites were prepared by a simple route, through which ZnO films were sputtered on crystal quartz substrates and CuAlO2 films were prepared by sol-gel on ZnO films and then these bilayer films were composited with C QDs on their surface. The characterization results indicated that C QDs were well combined with the surface of the CuAlO2 films. The photovoltage and photocurrent of these bilayer film composites were investigated under illumination and darkness switching, which demonstrated to be significantly enhanced compared with those of the CuAlO2/ZnO bilayer films. Through analysis, this enhancement of the photoconductivity was mainly attributed to C QDs with unique up-converted photoluminescence behavior.
“…Up to date, the design of CQDs/semiconductor composites (CQDs/TiO 2 , CQDs/SiO 2 , CQDs/ Fe 2 O 3 , CQDs/Cu 2 O, CQDs/Ag 3 PO 4 , CQDs/C 3 N 4 Þ with enhanced photocatalytic performance has been achieved. [19][20][21][22][23][24][25][26] Considering the remarkable properties of CQDs and the limitations of the Bi 2 WO 6 photocatalytic system, the combination of CQDs and Bi 2 WO 6 may be regarded as an ideal strategy to construct an e±cient composite photocatalyst.…”
In this study, we report the facile fabrication of carbon quantum dots (CQDs)/Bi 2 WO 6 nanocomposites, as well as their e®ective photocatalytic activity for the photodegradation of organic pollutants and hydrogen production. The observed results here revealed that CQDs/Bi 2 WO 6 composites possessed much higher photocatalytic activity in the degradation of both rhodamine B and phenol under simulated solar light after optimizing the hybridization with CQDs, which was attributed to the excellent up-converted photoluminescence, photo-induced electron transfer and electron reservoir properties of CQDs. Signi¯cantly di®erent from pure Bi 2 WO 6 , the CQDs/ Bi 2 WO 6 composites also displayed excellent photocatalytic H 2 production activity, which can be ascribed to the suitable conduction band edge and su±cient reduction ability of CQDs.
“…The peaks at 284.24, 285.44 and 287.99 eV for C 1 s spectrum are ascribed to the C–C bond with sp 2 orbital, C–O and C=O bonds, respectively. The main peak of O 1 s spectrum at 529.06, 530.49 and 531.49 eV is attributed to Ti=O, C=O and C–OH, respectively [45,46]. Figure 3.( a ) HRTEM of CQD/TiO 2 NWs; ( b ) Raman spectra; and ( c ) FTIR spectra of TiO 2 NWs and CQDs/TiO 2 NWs.…”
The green synthesis of nanowired photocatalyst composed of carbon quantum dots-titanium hybrid-semiconductors, CQDs/TiO2, are reported. Where graphite-based CQDs with a size less than 5 nm are directly synthesized in pure water electrolyte by a one-step electrochemistry approach and subsequently electrodeposited onto as-prepared TiO2 nanowires through a voltage-driven reduction process. Electron paramagnetic resonance studies show that the CQDs can generate singlet oxygen and/or oxygen radicals to decompose the kinetic H2O2 intermediate species upon UV light illumination. With the effect of peroxidase-like CQDs, photocurrent density of CQDs/TiO2 is remarkably enhanced by a 6.4 factor when compared with that of as-prepared TiO2.
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