Formation, characterisation and redox behaviour of water-soluble colloidal manganese dioxide

Zaheer, Zoya; Rafiuddin,

doi:10.1080/17458080.2010.501965

Cited by 3 publications

(1 citation statement)

References 20 publications

(31 reference statements)

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“…The reaction was very fast, and the change in the color from light pink to brown indicated the formation of MnO 2 nanospheres. The reaction was a one-step, two-electron redox reaction between methionine and Mn(VII) . Different-size MnO 2 nanospheres (large (L-Mn NS), medium (M-Mn NS) and small (S-Mn NS)) were synthesized by varying the concentration of l -methionine and keeping the concentration of KMnO 4 fixed (Table ).…”

Section: Materials and Reagentsmentioning

confidence: 99%

Carbon Dot–MnO₂ Nanosphere Composite Sensors for Selective Detection of Glutathione

Sohal

Maity

Basu

2020

ACS Appl. Nano Mater.

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Herein, a fluorescent nanosensor based on carbon dots (Cdots) and different-size MnO2 nanospheres has been synthesized for rapid detection of glutathione (GSH). Water-soluble and highly fluorescent Cdots were prepared by the microwave method using ascorbic acid as the precursor. MnO2 nanospheres of different sizes (large, medium, and small) were prepared by varying the concentration ratio of methionine and KMnO4 at room temperature, which was confirmed by HRTEM analysis. The different sizes of MnO2 nanospheres in Cdots result in quenching of the fluorescence intensity, quantum yields, and average lifetime values, which suggest that the fluorescence resonance energy transfer mechanism occurs between the Cdots and MnO2 nanospheres. The variations of all the photophysical parameters and fluorescence turn off properties of Cdots are significantly tuned depending on the size of the nanospheres. Moreover, detection of GSH in the presence of different-size Cdots@MnO2 systems has been explored. GSH causes the redox reaction in the presence of MnO2, which leads to transformation from MnO2 to Mn2+. As a result, fluorescence restoration (turn on) of Cdots was observed. The large MnO2 nanospheres showed the lowest detection limit of 15 μM for GSH. The synthesized sensing system was very fast, simple, economical, and environmentally-friendly for the detection of the GSH level.

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Section: Materials and Reagentsmentioning

confidence: 99%

Carbon Dot–MnO₂ Nanosphere Composite Sensors for Selective Detection of Glutathione

Sohal

Maity

Basu

2020

ACS Appl. Nano Mater.

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show abstract

Formation, characterisation and redox behaviour of water-soluble colloidal manganese dioxide

Cited by 3 publications

References 20 publications

Carbon Dot–MnO₂ Nanosphere Composite Sensors for Selective Detection of Glutathione

Carbon Dot–MnO₂ Nanosphere Composite Sensors for Selective Detection of Glutathione

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Formation, characterisation and redox behaviour of water-soluble colloidal manganese dioxide

Cited by 3 publications

References 20 publications

Carbon Dot–MnO2 Nanosphere Composite Sensors for Selective Detection of Glutathione

Carbon Dot–MnO2 Nanosphere Composite Sensors for Selective Detection of Glutathione

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Carbon Dot–MnO₂ Nanosphere Composite Sensors for Selective Detection of Glutathione

Carbon Dot–MnO₂ Nanosphere Composite Sensors for Selective Detection of Glutathione