Electro-optical characterization of Ti/Au–ZnTe Schottky diodes with CdTe quantum dots

We investigated the optical characterization of luminescent thioglycolic acid (TGA) stabilized CdTe quantum dots (CdTe-QD) synthesized in water. The influence of stabilizing agents on the luminescent properties of water-soluble CdTe quantum dots (QDs) was described. It is found that QDs can be synthesized easily when TGA is chosen as stabilizing agent and TGA leads to preparation of highly luminescent QDs due to the secondary effects of bonds between Cd2+ and sulfhydryl groups. The absorption wavelength and PL stability of TGA-CdTe are also characterized. Size can be controlled between 2.0 nm to 4.0 nm. The TGA-CdTe QDs prepared at 2 h reaction time possess excellent luminescent properties.

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Structural and optical characterization of CdTe quantum dots thin films

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2014.03.104 ◽

2014 ◽

Vol 604 ◽

pp. 253-259 ◽

Cited By ~ 20

Author(s):

M.M. El-Nahass ◽

G.M. Youssef ◽

Sohaila Z. Noby

Keyword(s):

Thin Films ◽

Quantum Dots ◽

Optical Characterization ◽

Cdte Quantum Dots

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Microstructure and optical characterization of CdTe quantum dots synthesized in a record minimum time

Journal of Applied Physics ◽

10.1063/1.3498814 ◽

2010 ◽

Vol 108 (8) ◽

pp. 083515 ◽

Cited By ~ 11

Author(s):

S. Patra ◽

S. K. Pradhan

Keyword(s):

Quantum Dots ◽

Optical Characterization ◽

Minimum Time ◽

Cdte Quantum Dots

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L-cysteine functionalized graphene quantum dots for sub-ppb detection of As (III)

Nanotechnology ◽

10.1088/1361-6528/ac353b ◽

2021 ◽

Author(s):

Md. Farhan Naseh ◽

Neelam Singh ◽

Jamilur R. Ansari ◽

Ashavani Kumar ◽

Tapan Sarkar ◽

...

Keyword(s):

Electron Microscopy ◽

Quantum Dots ◽

Room Temperature ◽

Graphene Quantum Dots ◽

Optical Characterization ◽

Functionalized Graphene ◽

Transmission Electron ◽

Sensitivity And Selectivity ◽

Structural Characterizations

Abstract Here, we report functionalized graphene quantum dots (GQDs) for the optical detection of arsenic at room temperature. GQDs with the fluorescence of three fundamental colors (red, green, and blue) were synthesized and functionally capped with L-cysteine (L-cys) to impart selectively towards As (III) by exploiting the affinity of L-cys towards arsenite. The optical characterization of GQDs was carried out using UV-Vis absorption spectroscopy, Fourier transform infrared spectroscopy, and fluorescence spectrometry and the structural characterizations were performed using transmission electron microscopy. The fluorescence results showed instantaneous quenching in intensity when the GQDs came in contact with As (III) for all test concentrations over a range from 0.025 ppb to 25 ppb, which covers the permissible limit of arsenic in drinking water. The experimental results suggested excellent sensitivity and selectivity towards As (III).

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