“…A plot of (α hv ) 2 vs hv can be obtained from UV‐vis absorbance spectra and shown in Figure B. The optical band gap E g of the sample could be calculated by extrapolating the linear region of the plots to the hv axis . The E g values of TiO 2 , Ag/TiO 2 , 9‐GQDs/Ag/TiO 2 , and 12‐GQDs/Ag/TiO 2 are 3.00 eV, 2.63 eV, 2.37 eV, and 2.16 eV respectively.…”
Section: Resultsmentioning
confidence: 99%
“…The optical band gap E g of the sample could be calculated by extrapolating the linear region of the plots to the hv axis. 25 The E g values of TiO 2 , Ag/TiO 2 , 9-GQDs/Ag/TiO 2 , and 12-GQDs/Ag/TiO 2 are 3.00 eV, 2.63 eV, 2.37 eV, and 2.16 eV respectively. The optical band gap reduces with the increasing of Ag content and graphene incorporation.…”
TiO2 thin films were fabricated through hydrothermal method. Silver nanoparticles were loaded on TiO2 thin films via photoreduction technique. Subsequently, the graphene quantum dots (GQDs) were spin‐coated on the Ag/TiO2 nanocomposites thin films. The crystal structure, surface morphology and UV‐vis absorbance were tested by XRD, SEM and ultraviolet‐visible spectrophotometer. These results indicated that Ag nanoparticles and GQDs are anchored on the TiO2 nanorods. Absorbance of Ag/TiO2 and GQDs/Ag/TiO2 nanocomposite thin films have been extended into the visible region. Visible‐light response of the samples were investigated by electrochemical workstation. The photoresponse of the sample can be enhanced by sensitization of the Ag nanoparticles and GQDs. The enhanced visible‐light response may be due to the surface plasmon resonance of silver nanoparticles and visible absorbance of GQDs. The highest photocatalytic activity has been observed in the 9‐GQDs/Ag/TiO2 composite thin film. The efficient charge separation and transportation can be achieved by introducing the Ag nanoparticles and GQDs in the TiO2 thin film.
“…A plot of (α hv ) 2 vs hv can be obtained from UV‐vis absorbance spectra and shown in Figure B. The optical band gap E g of the sample could be calculated by extrapolating the linear region of the plots to the hv axis . The E g values of TiO 2 , Ag/TiO 2 , 9‐GQDs/Ag/TiO 2 , and 12‐GQDs/Ag/TiO 2 are 3.00 eV, 2.63 eV, 2.37 eV, and 2.16 eV respectively.…”
Section: Resultsmentioning
confidence: 99%
“…The optical band gap E g of the sample could be calculated by extrapolating the linear region of the plots to the hv axis. 25 The E g values of TiO 2 , Ag/TiO 2 , 9-GQDs/Ag/TiO 2 , and 12-GQDs/Ag/TiO 2 are 3.00 eV, 2.63 eV, 2.37 eV, and 2.16 eV respectively. The optical band gap reduces with the increasing of Ag content and graphene incorporation.…”
TiO2 thin films were fabricated through hydrothermal method. Silver nanoparticles were loaded on TiO2 thin films via photoreduction technique. Subsequently, the graphene quantum dots (GQDs) were spin‐coated on the Ag/TiO2 nanocomposites thin films. The crystal structure, surface morphology and UV‐vis absorbance were tested by XRD, SEM and ultraviolet‐visible spectrophotometer. These results indicated that Ag nanoparticles and GQDs are anchored on the TiO2 nanorods. Absorbance of Ag/TiO2 and GQDs/Ag/TiO2 nanocomposite thin films have been extended into the visible region. Visible‐light response of the samples were investigated by electrochemical workstation. The photoresponse of the sample can be enhanced by sensitization of the Ag nanoparticles and GQDs. The enhanced visible‐light response may be due to the surface plasmon resonance of silver nanoparticles and visible absorbance of GQDs. The highest photocatalytic activity has been observed in the 9‐GQDs/Ag/TiO2 composite thin film. The efficient charge separation and transportation can be achieved by introducing the Ag nanoparticles and GQDs in the TiO2 thin film.
“…The band gap of ZnO and Cu 2 O layers were found to be 3.2 and 2.0 eV corresponding. These values are suitable to the ideal band gap of the ZnO and Cu 2 O crystals (Lv et al 2015 ). Fig.…”
In this study, two layers: i-ZnO nanorods and p-Cu2O were fabricated by electrochemical deposition. The fabricating process was the initial formation of ZnO nanorods layer on the n-IGZO thin film which was prepared by sputtering method, then a p-Cu2O layer was deposited on top of rods to form the p-Cu2O/i-ZnO nanorods/n-ZnO heterojunction. The XRD, SEM, UV–VIS, I–V characteristics methods were used to define structure, optical and electrical properties of these heterojunction layers. The fabricating conditions and thickness of the Cu2O layers significantly affected to the formation, microstructure, electrical and optical properties of the junction. The length of i-ZnO nanorods layer in the structure of the heterojunction has strongly affected to the carriers transport mechanism and performance of this heterojunction.
“…46 For the sample of Ag( 7)/TNR, the intensity is higher than that of Ag( 5)/TNR and the relative intensity of emission peaks at the visible to the ultraviolet is highest, which indicates that the surface oxygen vacancies and defects are abundant, and may form the recombination center of electron-hole pairs, leading a relative high recombination rate and lower photoelectrochemical and photocatalytic properties. 38,48 Photoelectrochemical measurements.-The transient photocurrent responses usually provide further evidence of electron-hole transfer mechanism. 46 The photocurrent density versus time curves for different anodes under intermittent illumination are shown in Fig.…”
Highly ordered TiO 2 nanorod (TNR) array films decorated with Ag nanoparticles (NPs) were synthesized on fluorine-doped tin oxide (FTO) by a hydrothermal treatment and a successive ionic layer adsorption reaction (SILAR) technique. The amount of Ag NPs on the TNR can be controlled by changing the number of cycles in silver nitrate (AgNO 3 ) solution. The morphology, structure, composition, optical, photoelectrochemical and photocatalytic properties of the Ag/TNR films were investigated in detail. The Ag/TNR films exhibit larger redshift of the absorption edges and higher absorption intensities in the visible light range. Furthermore, the Ag/TNR films sensitized with 5 SILAR cycles show the best photocurrent density (32 μA/cm 2 ) and photodegradation efficiency (95.52%), which is 5.7 and 1.3 times higher than that of pure TNR, respectively. The excellent properties can be ascribed to localized surface plasmon resonance (LSPR) effect of Ag NPs. The stability and reusability of the Ag/TNR films were also investigated. Therefore, the Ag/TNR films with high performance and stability can be used in potential applications.
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