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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.


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The synthesis process of Ag2S/CdS/TNTs by SSM
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Fig1: The synthesis process of Ag2S/CdS/TNTs by SSM

Mentions: CdS/TNTs were fabricated via the successive ionic layer adsorption and reaction (SILAR) method. The TNTs were dipped inside 0.025 mol · L−1 Cd(NO3)2 and 0.025 mol · L−1 Na2S aqueous solutions for 5 min separately and for a couple of cycles. Before dipping into each solution, the nanotube array films were simply rinsed with Milli-Q water and dried in N2 stream. This treatment procedure was repeated depending on our need. Ag2S/TNTs were fabricated via similar methods. After being washed in Milli-Q water and dried in N2 stream, CdS/TNTs were ready for the Ag2S/CdS/TNTs preparation via SSM. A 0.025 mol · L−1 AgNO3 solution (300 μL) was spotted on the local domain of CdS/TNTs with a capillary glass tube (0.5 mm) and dried in air; then, a 0.025 mol · L−1 Na2S solution (150 μL) was spotted on the same place and dried in air. The preparation procedure was repeated a number of times according to requirement. After being washed in ultrapure water, the hybrid nanotube array films were thermally treated at 200 °C for 2 h. The solution used in this work is ethanol/water solution (ethanol:water = 1:1). The synthesis process of Ag2S/CdS/TNTs by SSM is shown in Fig. 1. Correspondingly, Ag2S/CdS/TNTs was fabricated by uniformly depositing the Ag2S quantum dots into the CdS/TNTs via SILAR method.Fig. 1


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)

The synthesis process of Ag2S/CdS/TNTs by SSM
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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

Fig1: The synthesis process of Ag2S/CdS/TNTs by SSM
Mentions: CdS/TNTs were fabricated via the successive ionic layer adsorption and reaction (SILAR) method. The TNTs were dipped inside 0.025 mol · L−1 Cd(NO3)2 and 0.025 mol · L−1 Na2S aqueous solutions for 5 min separately and for a couple of cycles. Before dipping into each solution, the nanotube array films were simply rinsed with Milli-Q water and dried in N2 stream. This treatment procedure was repeated depending on our need. Ag2S/TNTs were fabricated via similar methods. After being washed in Milli-Q water and dried in N2 stream, CdS/TNTs were ready for the Ag2S/CdS/TNTs preparation via SSM. A 0.025 mol · L−1 AgNO3 solution (300 μL) was spotted on the local domain of CdS/TNTs with a capillary glass tube (0.5 mm) and dried in air; then, a 0.025 mol · L−1 Na2S solution (150 μL) was spotted on the same place and dried in air. The preparation procedure was repeated a number of times according to requirement. After being washed in ultrapure water, the hybrid nanotube array films were thermally treated at 200 °C for 2 h. The solution used in this work is ethanol/water solution (ethanol:water = 1:1). The synthesis process of Ag2S/CdS/TNTs by SSM is shown in Fig. 1. Correspondingly, Ag2S/CdS/TNTs was fabricated by uniformly depositing the Ag2S quantum dots into the CdS/TNTs via SILAR method.Fig. 1

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