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Biosynthesis of luminescent CdS quantum dots using plant hairy root culture.

Borovaya MN, Naumenko AP, Matvieieva NA, Blume YB, Yemets AI - Nanoscale Res Lett (2014)

Bottom Line: Transmission electron microscopy of produced quantum dots revealed their spherical shape with a size predominantly from 5 to 7 nm.Electron diffraction pattern confirmed the wurtzite crystalline structure of synthesized cadmium sulfide quantum dots.These results describe the first successful attempt of quantum dots synthesis using plant extract. 81.07.Ta; 81.16.-c; 81.16.Rf.

View Article: PubMed Central - PubMed

Affiliation: Department of Genomics and Molecular Biotechnology, Institute of Food Biotechnology and Genomics, Natl. Acad. of Sci. of Ukraine, Osypovskogo Str., 2a, Kiev, 04123, Ukraine, marie0589@gmail.com.

ABSTRACT

Unlabelled: CdS nanoparticles have a great potential for application in chemical research, bioscience and medicine. The aim of this study was to develop an efficient and environmentally-friendly method of plant-based biosynthesis of CdS quantum dots using hairy root culture of Linaria maroccana L. By incubating Linaria root extract with inorganic cadmium sulfate and sodium sulfide we synthesized stable luminescent CdS nanocrystals with absorption peaks for UV-visible spectrometry at 362 nm, 398 nm and 464 nm, and luminescent peaks at 425, 462, 500 nm. Transmission electron microscopy of produced quantum dots revealed their spherical shape with a size predominantly from 5 to 7 nm. Electron diffraction pattern confirmed the wurtzite crystalline structure of synthesized cadmium sulfide quantum dots. These results describe the first successful attempt of quantum dots synthesis using plant extract.

Pacs: 81.07.Ta; 81.16.-c; 81.16.Rf.

No MeSH data available.


Luminescence spectrum of CdS nanoparticles. Freshly prepared samples were used. for the measurements. Cadmium sulfide quantum dots samples contained 2 ml of 0.025 М CdSO4 solution, 30 ml of a hairy root aqueous extract of L. maroccana and 500 μl of 0.5 М Na2S. Inorganic salts were needed as external sources of cadmium and sulfide ions. Luminescence spectrum was measured at excitation λ = 340 nm. Three clear maxima corresponded to the wavelengths 425 nm, 462 nm and 500 nm.
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Fig5: Luminescence spectrum of CdS nanoparticles. Freshly prepared samples were used. for the measurements. Cadmium sulfide quantum dots samples contained 2 ml of 0.025 М CdSO4 solution, 30 ml of a hairy root aqueous extract of L. maroccana and 500 μl of 0.5 М Na2S. Inorganic salts were needed as external sources of cadmium and sulfide ions. Luminescence spectrum was measured at excitation λ = 340 nm. Three clear maxima corresponded to the wavelengths 425 nm, 462 nm and 500 nm.

Mentions: Luminescence spectrum of freshly prepared CdS quantum dots under mercury-vapour lamp excitation λ = 340 nm (Figure 5) was typical for nanodimension CdS [20]. It contained three clear maxima that were overlapped. Total synthesized spectrum is demonstrated in Figure 4 by dashed line. As a result it was revealed that luminescence maxima corresponded to the wavelengths 425 nm, 462 nm and 500 nm. It is believed that at excitation λ = 340 nm (3.65 eV) these luminescent peaks correspond to transitions 1se - 1sh between dimensional quantization levels in CdS nanoparticles with different diameters. Using previously established relationship between energy of the optical transition 1se - 1sh and diameter of the CdS nanoparticles [23], we determined that luminescence peaks at 425 nm (2.92 eV), 462 nm (2.68 eV) and 500 nm (2.48 eV) corresponded to transitions 1se - 1sh in cadmium sulfide nanoparticles with a diameter of 3.8 nm, 5.2 nm and 6.9 nm, respectively. Moreover, the fact that spectrum in the region 460–500 nm was wide enough indicated the presence of a significant amount of CdS nanoparticles with a diameter from 5 to 7 nm in a tested specimen. This size range of synthesized nanoparticles correlated well with obtained TEM data and optical absorption spectra.Figure 5


Biosynthesis of luminescent CdS quantum dots using plant hairy root culture.

Borovaya MN, Naumenko AP, Matvieieva NA, Blume YB, Yemets AI - Nanoscale Res Lett (2014)

Luminescence spectrum of CdS nanoparticles. Freshly prepared samples were used. for the measurements. Cadmium sulfide quantum dots samples contained 2 ml of 0.025 М CdSO4 solution, 30 ml of a hairy root aqueous extract of L. maroccana and 500 μl of 0.5 М Na2S. Inorganic salts were needed as external sources of cadmium and sulfide ions. Luminescence spectrum was measured at excitation λ = 340 nm. Three clear maxima corresponded to the wavelengths 425 nm, 462 nm and 500 nm.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
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getmorefigures.php?uid=PMC4493840&req=5

Fig5: Luminescence spectrum of CdS nanoparticles. Freshly prepared samples were used. for the measurements. Cadmium sulfide quantum dots samples contained 2 ml of 0.025 М CdSO4 solution, 30 ml of a hairy root aqueous extract of L. maroccana and 500 μl of 0.5 М Na2S. Inorganic salts were needed as external sources of cadmium and sulfide ions. Luminescence spectrum was measured at excitation λ = 340 nm. Three clear maxima corresponded to the wavelengths 425 nm, 462 nm and 500 nm.
Mentions: Luminescence spectrum of freshly prepared CdS quantum dots under mercury-vapour lamp excitation λ = 340 nm (Figure 5) was typical for nanodimension CdS [20]. It contained three clear maxima that were overlapped. Total synthesized spectrum is demonstrated in Figure 4 by dashed line. As a result it was revealed that luminescence maxima corresponded to the wavelengths 425 nm, 462 nm and 500 nm. It is believed that at excitation λ = 340 nm (3.65 eV) these luminescent peaks correspond to transitions 1se - 1sh between dimensional quantization levels in CdS nanoparticles with different diameters. Using previously established relationship between energy of the optical transition 1se - 1sh and diameter of the CdS nanoparticles [23], we determined that luminescence peaks at 425 nm (2.92 eV), 462 nm (2.68 eV) and 500 nm (2.48 eV) corresponded to transitions 1se - 1sh in cadmium sulfide nanoparticles with a diameter of 3.8 nm, 5.2 nm and 6.9 nm, respectively. Moreover, the fact that spectrum in the region 460–500 nm was wide enough indicated the presence of a significant amount of CdS nanoparticles with a diameter from 5 to 7 nm in a tested specimen. This size range of synthesized nanoparticles correlated well with obtained TEM data and optical absorption spectra.Figure 5

Bottom Line: Transmission electron microscopy of produced quantum dots revealed their spherical shape with a size predominantly from 5 to 7 nm.Electron diffraction pattern confirmed the wurtzite crystalline structure of synthesized cadmium sulfide quantum dots.These results describe the first successful attempt of quantum dots synthesis using plant extract. 81.07.Ta; 81.16.-c; 81.16.Rf.

View Article: PubMed Central - PubMed

Affiliation: Department of Genomics and Molecular Biotechnology, Institute of Food Biotechnology and Genomics, Natl. Acad. of Sci. of Ukraine, Osypovskogo Str., 2a, Kiev, 04123, Ukraine, marie0589@gmail.com.

ABSTRACT

Unlabelled: CdS nanoparticles have a great potential for application in chemical research, bioscience and medicine. The aim of this study was to develop an efficient and environmentally-friendly method of plant-based biosynthesis of CdS quantum dots using hairy root culture of Linaria maroccana L. By incubating Linaria root extract with inorganic cadmium sulfate and sodium sulfide we synthesized stable luminescent CdS nanocrystals with absorption peaks for UV-visible spectrometry at 362 nm, 398 nm and 464 nm, and luminescent peaks at 425, 462, 500 nm. Transmission electron microscopy of produced quantum dots revealed their spherical shape with a size predominantly from 5 to 7 nm. Electron diffraction pattern confirmed the wurtzite crystalline structure of synthesized cadmium sulfide quantum dots. These results describe the first successful attempt of quantum dots synthesis using plant extract.

Pacs: 81.07.Ta; 81.16.-c; 81.16.Rf.

No MeSH data available.