Limits...
Ag2S/CdS/TiO2 Nanotube Array Films with High Photocurrent Density by Spotting Sample Method.

Sun H, Zhao P, Zhang F, Liu Y, Hao J - Nanoscale Res Lett (2015)

Bottom Line: The X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectrum (XPS) results demonstrated that the Ag2S/CdS/TNTs prepared by SSM and other films were successfully prepared.The cycles of local deposition have great influence on their photoelectric properties.The photocurrent density of Ag2S/CdS/TNTs by SSM with optimum deposition cycles of 6 was about 37 times that of TNTs without modification, demonstrating their great prospective applications in solar energy utilization fields.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Colloid and Interface Chemistry & Key Laboratory of Special Aggregated Materials, Shandong University, Ministry of Education, Jinan, 250100, People's Republic of China.

ABSTRACT
Ag2S/CdS/TiO2 hybrid nanotube array films (Ag2S/CdS/TNTs) were prepared by selectively depositing a narrow-gap semiconductor-Ag2S (0.9 eV) quantum dots (QDs)-in the local domain of the CdS/TiO2 nanotube array films by spotting sample method (SSM). The improvement of sunlight absorption ability and photocurrent density of titanium dioxide (TiO2) nanotube array films (TNTs) which were obtained by anodic oxidation method was realized because of modifying semiconductor QDs. The CdS/TNTs, Ag2S/TNTs, and Ag2S/CdS/TNTs fabricated by uniformly depositing the QDs into the TNTs via the successive ionic layer adsorption and reaction (SILAR) method were synthesized, respectively. The X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectrum (XPS) results demonstrated that the Ag2S/CdS/TNTs prepared by SSM and other films were successfully prepared. In comparison with the four films of TNTs, CdS/TNTs, Ag2S/TNTs, and Ag2S/CdS/TNTs by SILAR, the Ag2S/CdS/TNTs prepared by SSM showed much better absorption capability and the highest photocurrent density in UV-vis range (320~800 nm). The cycles of local deposition have great influence on their photoelectric properties. The photocurrent density of Ag2S/CdS/TNTs by SSM with optimum deposition cycles of 6 was about 37 times that of TNTs without modification, demonstrating their great prospective applications in solar energy utilization fields.

No MeSH data available.


Related in: MedlinePlus

a The S, C, Ag, Cd, Ti, and O elements can be found in the survey spectrum. b The high-resolution Ti2p XPS spectrum has two peaks at 464.8 and 458.9 eV. c Two characteristic peaks are observed at 405.2 (Cd3d5/2)  and 412.0 eV (Cd3d3/2). d The Ag3d core level could be satisfactorily fit to single spin-orbit pair at 368.4 eV (Ag3d5/2) and at 374.4 eV (Ag3d3/2). e The high-resolution XPS spectrum of S2p
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4591224&req=5

Fig5: a The S, C, Ag, Cd, Ti, and O elements can be found in the survey spectrum. b The high-resolution Ti2p XPS spectrum has two peaks at 464.8 and 458.9 eV. c Two characteristic peaks are observed at 405.2 (Cd3d5/2)  and 412.0 eV (Cd3d3/2). d The Ag3d core level could be satisfactorily fit to single spin-orbit pair at 368.4 eV (Ag3d5/2) and at 374.4 eV (Ag3d3/2). e The high-resolution XPS spectrum of S2p

Mentions: The X-ray photoelectron spectroscopy (XPS) was carried out to further confirm the chemical state of Ti, S, Ag, and Cd atoms in the array films of Ag2S/CdS/TNTs by SSM, and each element gives rise to a characteristic set of peaks. The S, C, Ag, Cd, Ti, and O elements can be found in the survey spectrum (Fig. 5a). The C element is mainly from carbon grid. The high-resolution Ti2p XPS spectrum (Fig. 5b) has two peaks at 464.8 and 458.9 eV, and the doublet feature due to spin-orbit splitting results in the 2p3/2 and 2p1/2 peaks with spin-orbit separation 5.9 eV. This result agrees with Ti(IV) in pure anatase TiO2. As shown in Fig. 5c, two characteristic peaks are observed at 405.2 and 412.0 eV, which belong to Cd3d5/2 and Cd3d3/2, respectively. The Ag3d core level could be satisfactorily fit to single spin-orbit pair at 368.4 eV (Ag3d5/2) and at 374.4 eV (Ag3d3/2) in Fig. 5d. Figure 5e is the high-resolution XPS spectrum of S2p, and two peaks have also been given through Gaussian fitting. The two characteristic peaks at 161.2 and 162.2 eV are assigned to S2p3/2 and S2p1/2. With reference to the literature [31], the peak S2p1/2 at 162.2 eV corresponds to CdS and the peak S2p3/2 at 161.2 eV to Ag2S.Fig. 5


Ag2S/CdS/TiO2 Nanotube Array Films with High Photocurrent Density by Spotting Sample Method.

Sun H, Zhao P, Zhang F, Liu Y, Hao J - Nanoscale Res Lett (2015)

a The S, C, Ag, Cd, Ti, and O elements can be found in the survey spectrum. b The high-resolution Ti2p XPS spectrum has two peaks at 464.8 and 458.9 eV. c Two characteristic peaks are observed at 405.2 (Cd3d5/2)  and 412.0 eV (Cd3d3/2). d The Ag3d core level could be satisfactorily fit to single spin-orbit pair at 368.4 eV (Ag3d5/2) and at 374.4 eV (Ag3d3/2). e The high-resolution XPS spectrum of S2p
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4591224&req=5

Fig5: a The S, C, Ag, Cd, Ti, and O elements can be found in the survey spectrum. b The high-resolution Ti2p XPS spectrum has two peaks at 464.8 and 458.9 eV. c Two characteristic peaks are observed at 405.2 (Cd3d5/2)  and 412.0 eV (Cd3d3/2). d The Ag3d core level could be satisfactorily fit to single spin-orbit pair at 368.4 eV (Ag3d5/2) and at 374.4 eV (Ag3d3/2). e The high-resolution XPS spectrum of S2p
Mentions: The X-ray photoelectron spectroscopy (XPS) was carried out to further confirm the chemical state of Ti, S, Ag, and Cd atoms in the array films of Ag2S/CdS/TNTs by SSM, and each element gives rise to a characteristic set of peaks. The S, C, Ag, Cd, Ti, and O elements can be found in the survey spectrum (Fig. 5a). The C element is mainly from carbon grid. The high-resolution Ti2p XPS spectrum (Fig. 5b) has two peaks at 464.8 and 458.9 eV, and the doublet feature due to spin-orbit splitting results in the 2p3/2 and 2p1/2 peaks with spin-orbit separation 5.9 eV. This result agrees with Ti(IV) in pure anatase TiO2. As shown in Fig. 5c, two characteristic peaks are observed at 405.2 and 412.0 eV, which belong to Cd3d5/2 and Cd3d3/2, respectively. The Ag3d core level could be satisfactorily fit to single spin-orbit pair at 368.4 eV (Ag3d5/2) and at 374.4 eV (Ag3d3/2) in Fig. 5d. Figure 5e is the high-resolution XPS spectrum of S2p, and two peaks have also been given through Gaussian fitting. The two characteristic peaks at 161.2 and 162.2 eV are assigned to S2p3/2 and S2p1/2. With reference to the literature [31], the peak S2p1/2 at 162.2 eV corresponds to CdS and the peak S2p3/2 at 161.2 eV to Ag2S.Fig. 5

Bottom Line: The X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectrum (XPS) results demonstrated that the Ag2S/CdS/TNTs prepared by SSM and other films were successfully prepared.The cycles of local deposition have great influence on their photoelectric properties.The photocurrent density of Ag2S/CdS/TNTs by SSM with optimum deposition cycles of 6 was about 37 times that of TNTs without modification, demonstrating their great prospective applications in solar energy utilization fields.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Colloid and Interface Chemistry & Key Laboratory of Special Aggregated Materials, Shandong University, Ministry of Education, Jinan, 250100, People's Republic of China.

ABSTRACT
Ag2S/CdS/TiO2 hybrid nanotube array films (Ag2S/CdS/TNTs) were prepared by selectively depositing a narrow-gap semiconductor-Ag2S (0.9 eV) quantum dots (QDs)-in the local domain of the CdS/TiO2 nanotube array films by spotting sample method (SSM). The improvement of sunlight absorption ability and photocurrent density of titanium dioxide (TiO2) nanotube array films (TNTs) which were obtained by anodic oxidation method was realized because of modifying semiconductor QDs. The CdS/TNTs, Ag2S/TNTs, and Ag2S/CdS/TNTs fabricated by uniformly depositing the QDs into the TNTs via the successive ionic layer adsorption and reaction (SILAR) method were synthesized, respectively. The X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectrum (XPS) results demonstrated that the Ag2S/CdS/TNTs prepared by SSM and other films were successfully prepared. In comparison with the four films of TNTs, CdS/TNTs, Ag2S/TNTs, and Ag2S/CdS/TNTs by SILAR, the Ag2S/CdS/TNTs prepared by SSM showed much better absorption capability and the highest photocurrent density in UV-vis range (320~800 nm). The cycles of local deposition have great influence on their photoelectric properties. The photocurrent density of Ag2S/CdS/TNTs by SSM with optimum deposition cycles of 6 was about 37 times that of TNTs without modification, demonstrating their great prospective applications in solar energy utilization fields.

No MeSH data available.


Related in: MedlinePlus