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Bright, stable, and water-soluble CuInS2/ZnS nanocrystals passivated by cetyltrimethylammonium bromide.

Lee J, Han CS - Nanoscale Res Lett (2015)

Bottom Line: As the result, a high quantum yield (QY) of 56.0% and excellent photostability were acquired in aqueous media.The optical features and structure of the obtained CTAB stabilized CIS/ZnS (CTAB-CIS/ZnS) NCs have been characterized by UV-vis and photoluminescence (PL) spectroscopies, XRD, XPS, EDX, and TEM.The high stability and PL of water soluble CTAB-CIS/ZnS NCs suggest their potential in nanoelectronics and bioapplications.

View Article: PubMed Central - PubMed

Affiliation: School of Mechanical Engineering, Korea University, 145 Anam-ro, Seoul, Korea.

ABSTRACT
We report a highly bright and stable aqueous dispersion of CuInS2/ZnS (CIS/ZnS) nanocrystals (NCs) using surfactant-assisted microemulsion and cold treatment. CIS/ZnS NCs were facilely synthesized via a stepwise, consecutive hybrid flow reactor approach. To stabilize the optical properties of hydrophobic CIS/ZnS NCs, cetyltrimethylammonium bromide (CTAB) was chosen as a matrix for aqueous phase transfer. As the result, a high quantum yield (QY) of 56.0% and excellent photostability were acquired in aqueous media. For removing excessive surfactants, cold treatment (4°C) of the CTAB-water solution was adopted to prevent further agglomeration of CIS/ZnS NCs, which could secure high stability over 6 months (less 2% reduction in QY). The optical features and structure of the obtained CTAB stabilized CIS/ZnS (CTAB-CIS/ZnS) NCs have been characterized by UV-vis and photoluminescence (PL) spectroscopies, XRD, XPS, EDX, and TEM. The high stability and PL of water soluble CTAB-CIS/ZnS NCs suggest their potential in nanoelectronics and bioapplications.

No MeSH data available.


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Synthesis scheme of CTAB-CIS/ZnS NCs.
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Fig1: Synthesis scheme of CTAB-CIS/ZnS NCs.

Mentions: The CIS/ZnS NCs (0.12 g in 4 mL of chloroform) were added to aqueous CTAB solution (0.8 g in 40 mL of H2O). The resulting solution was stirred vigorously at 35°C for 3 to 4 h. The formation of an oil-in-water microemulsion resulted in an opaque solution. The solution was then transferred to a heating mantle at 70°C for 10 min to evaporate the chloroform as well as to induce the interaction between the hydrophobic chains of the two surfactants. After cooling down to room temperature, it was put in the fridge (4°C) for 24 h. The NC solution was then further filtered with a 0.25 μm syringe filter to remove excess CTAB. The prepared water soluble CTAB-CIS/ZnS NCs were stored for subsequent experiments in sealed dark conditions. The procedure for the fabrication of the CTAB-CIS/ZnS NCs is described schematically in Figure 1.Figure 1


Bright, stable, and water-soluble CuInS2/ZnS nanocrystals passivated by cetyltrimethylammonium bromide.

Lee J, Han CS - Nanoscale Res Lett (2015)

Synthesis scheme of CTAB-CIS/ZnS NCs.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4385304&req=5

Fig1: Synthesis scheme of CTAB-CIS/ZnS NCs.
Mentions: The CIS/ZnS NCs (0.12 g in 4 mL of chloroform) were added to aqueous CTAB solution (0.8 g in 40 mL of H2O). The resulting solution was stirred vigorously at 35°C for 3 to 4 h. The formation of an oil-in-water microemulsion resulted in an opaque solution. The solution was then transferred to a heating mantle at 70°C for 10 min to evaporate the chloroform as well as to induce the interaction between the hydrophobic chains of the two surfactants. After cooling down to room temperature, it was put in the fridge (4°C) for 24 h. The NC solution was then further filtered with a 0.25 μm syringe filter to remove excess CTAB. The prepared water soluble CTAB-CIS/ZnS NCs were stored for subsequent experiments in sealed dark conditions. The procedure for the fabrication of the CTAB-CIS/ZnS NCs is described schematically in Figure 1.Figure 1

Bottom Line: As the result, a high quantum yield (QY) of 56.0% and excellent photostability were acquired in aqueous media.The optical features and structure of the obtained CTAB stabilized CIS/ZnS (CTAB-CIS/ZnS) NCs have been characterized by UV-vis and photoluminescence (PL) spectroscopies, XRD, XPS, EDX, and TEM.The high stability and PL of water soluble CTAB-CIS/ZnS NCs suggest their potential in nanoelectronics and bioapplications.

View Article: PubMed Central - PubMed

Affiliation: School of Mechanical Engineering, Korea University, 145 Anam-ro, Seoul, Korea.

ABSTRACT
We report a highly bright and stable aqueous dispersion of CuInS2/ZnS (CIS/ZnS) nanocrystals (NCs) using surfactant-assisted microemulsion and cold treatment. CIS/ZnS NCs were facilely synthesized via a stepwise, consecutive hybrid flow reactor approach. To stabilize the optical properties of hydrophobic CIS/ZnS NCs, cetyltrimethylammonium bromide (CTAB) was chosen as a matrix for aqueous phase transfer. As the result, a high quantum yield (QY) of 56.0% and excellent photostability were acquired in aqueous media. For removing excessive surfactants, cold treatment (4°C) of the CTAB-water solution was adopted to prevent further agglomeration of CIS/ZnS NCs, which could secure high stability over 6 months (less 2% reduction in QY). The optical features and structure of the obtained CTAB stabilized CIS/ZnS (CTAB-CIS/ZnS) NCs have been characterized by UV-vis and photoluminescence (PL) spectroscopies, XRD, XPS, EDX, and TEM. The high stability and PL of water soluble CTAB-CIS/ZnS NCs suggest their potential in nanoelectronics and bioapplications.

No MeSH data available.


Related in: MedlinePlus