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Modification of light absorption in thin CuInS2 films by sprayed Au nanoparticles.

Katerski A, Kärber E, Acik IO, Dolgov L, Mere A, Sildos I, Mikli V, Krunks M - Nanoscale Res Lett (2014)

Bottom Line: The prepared films show plasmonic light absorption with increasing intensity in the spectral range of 500- 800 nm when increasing the volume of HAuCl4 solution sprayed.When compared to bare CIS on glass, the absorptance was increased ca. 4.5 times in the case of glass/Au-NP/CIS and ca. 3 times in the case of glass/CIS/Au-NP configuration.The glass/Au-NP/CIS configuration had an advantage since Au-NP could be embedded without chemically damaging the CIS.

View Article: PubMed Central - PubMed

Affiliation: Laboratory of Thin Film Chemical Technologies, Department of Materials Science, Tallinn University of Technology, Tallinn, EE-19086, Estonia, atanas.katerski@ttu.ee.

ABSTRACT
The chemical spray pyrolysis method was used to deposit CuInS2 (CIS) thin films and Au nanoparticles (NPs) in two configurations: glass/Au-NP layer covered with CuInS2 film (Au-NP/CIS) and glass/CuInS2 films covered with Au-NP layer (CIS/Au-NP). According to X-ray diffraction (XRD), the spray of 2 mM HAuCl4 aqueous solution with a volume of 2.5 to 15 ml onto a glass substrate at 340°C results in metallic Au nanoparticles with a similar mean crystallite size in the range of 30 - 38 nm. The mean crystallite sizes remain in the range of 15 - 20 nm when grown onto a CIS film. The prepared films show plasmonic light absorption with increasing intensity in the spectral range of 500- 800 nm when increasing the volume of HAuCl4 solution sprayed. When compared to bare CIS on glass, the absorptance was increased ca. 4.5 times in the case of glass/Au-NP/CIS and ca. 3 times in the case of glass/CIS/Au-NP configuration. The glass/Au-NP/CIS configuration had an advantage since Au-NP could be embedded without chemically damaging the CIS.

No MeSH data available.


XRD patterns of CIS film as a reference and CIS/Au-NP nanocomposite films. Au nanoparticles are prepared by spray of 2.5, 10, and 15 ml of 2 mM HAuCl4 aqueous solution at 340°C onto CIS film previously grown at 310°C.
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Fig4: XRD patterns of CIS film as a reference and CIS/Au-NP nanocomposite films. Au nanoparticles are prepared by spray of 2.5, 10, and 15 ml of 2 mM HAuCl4 aqueous solution at 340°C onto CIS film previously grown at 310°C.

Mentions: The XRD patterns of the CIS film and of the CIS/Au-NP film (see Figure 1b) are presented in Figure 4. Both the CIS film and CIS/Au-NP film (Au-NPs from 2.5 ml of Au solution) reveal diffraction peaks at 2θ of 27.9° and 46.5°. The peaks were assigned to the reflections from (112) and (220) planes of CuInS2 (PDF 00-027-0159) [24]. An increase of the Au precursor solution volume from 2.5 to 15 ml leads to a higher intensity of the diffraction peaks characteristic of metallic Au (at 2θ of 38.2° and 44.4°) while the mean Au-NP crystallite size remains in between 15 and 20 nm (Table 1). Thus, Au-NP crystallite sizes (on CIS) are smaller compared to those on bare glass substrates. While increasing the spray volume up to 15 ml, the intensities of the diffraction peaks characteristic of CuInS2 are vanishing. At 15 ml of Au precursor solution sprayed, the (112) diffraction peak of CuInS2 has almost disappeared, indicating the absence of crystalline CIS. Possibly, the thermal decomposition products of HAuCl4 such as Cl2 and HCl [15, 22] react destructively with CuInS2. Presumably, the disappearance of the CIS phase is caused by the following chemical reaction:Figure 4


Modification of light absorption in thin CuInS2 films by sprayed Au nanoparticles.

Katerski A, Kärber E, Acik IO, Dolgov L, Mere A, Sildos I, Mikli V, Krunks M - Nanoscale Res Lett (2014)

XRD patterns of CIS film as a reference and CIS/Au-NP nanocomposite films. Au nanoparticles are prepared by spray of 2.5, 10, and 15 ml of 2 mM HAuCl4 aqueous solution at 340°C onto CIS film previously grown at 310°C.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
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Fig4: XRD patterns of CIS film as a reference and CIS/Au-NP nanocomposite films. Au nanoparticles are prepared by spray of 2.5, 10, and 15 ml of 2 mM HAuCl4 aqueous solution at 340°C onto CIS film previously grown at 310°C.
Mentions: The XRD patterns of the CIS film and of the CIS/Au-NP film (see Figure 1b) are presented in Figure 4. Both the CIS film and CIS/Au-NP film (Au-NPs from 2.5 ml of Au solution) reveal diffraction peaks at 2θ of 27.9° and 46.5°. The peaks were assigned to the reflections from (112) and (220) planes of CuInS2 (PDF 00-027-0159) [24]. An increase of the Au precursor solution volume from 2.5 to 15 ml leads to a higher intensity of the diffraction peaks characteristic of metallic Au (at 2θ of 38.2° and 44.4°) while the mean Au-NP crystallite size remains in between 15 and 20 nm (Table 1). Thus, Au-NP crystallite sizes (on CIS) are smaller compared to those on bare glass substrates. While increasing the spray volume up to 15 ml, the intensities of the diffraction peaks characteristic of CuInS2 are vanishing. At 15 ml of Au precursor solution sprayed, the (112) diffraction peak of CuInS2 has almost disappeared, indicating the absence of crystalline CIS. Possibly, the thermal decomposition products of HAuCl4 such as Cl2 and HCl [15, 22] react destructively with CuInS2. Presumably, the disappearance of the CIS phase is caused by the following chemical reaction:Figure 4

Bottom Line: The prepared films show plasmonic light absorption with increasing intensity in the spectral range of 500- 800 nm when increasing the volume of HAuCl4 solution sprayed.When compared to bare CIS on glass, the absorptance was increased ca. 4.5 times in the case of glass/Au-NP/CIS and ca. 3 times in the case of glass/CIS/Au-NP configuration.The glass/Au-NP/CIS configuration had an advantage since Au-NP could be embedded without chemically damaging the CIS.

View Article: PubMed Central - PubMed

Affiliation: Laboratory of Thin Film Chemical Technologies, Department of Materials Science, Tallinn University of Technology, Tallinn, EE-19086, Estonia, atanas.katerski@ttu.ee.

ABSTRACT
The chemical spray pyrolysis method was used to deposit CuInS2 (CIS) thin films and Au nanoparticles (NPs) in two configurations: glass/Au-NP layer covered with CuInS2 film (Au-NP/CIS) and glass/CuInS2 films covered with Au-NP layer (CIS/Au-NP). According to X-ray diffraction (XRD), the spray of 2 mM HAuCl4 aqueous solution with a volume of 2.5 to 15 ml onto a glass substrate at 340°C results in metallic Au nanoparticles with a similar mean crystallite size in the range of 30 - 38 nm. The mean crystallite sizes remain in the range of 15 - 20 nm when grown onto a CIS film. The prepared films show plasmonic light absorption with increasing intensity in the spectral range of 500- 800 nm when increasing the volume of HAuCl4 solution sprayed. When compared to bare CIS on glass, the absorptance was increased ca. 4.5 times in the case of glass/Au-NP/CIS and ca. 3 times in the case of glass/CIS/Au-NP configuration. The glass/Au-NP/CIS configuration had an advantage since Au-NP could be embedded without chemically damaging the CIS.

No MeSH data available.