Artistic anti-counterfeiting with a pH-responsive fluorescent ink using DFT and molecular electrostatic potential mapping insights DOI Creative Commons

Hebat‐Allah S. Tohamy

Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)

Published: June 2, 2025

The observed fluorescence behavior of the sulfur, nitrogen-doped carbon dots (S, N-CDs) ink which derived from onion peel wastes (OW) demonstrates its pH-sensitive nature, making it suitable for applications where visual or fluorescent changes upon pH variation are desired. initial lack under UV light suggests that S, N-CDs in a non-fluorescent state. However, treatment with acid, exhibits faint yellow color and fluoresces light. This indicates shift electronic structure N-CDs, likely due to protonation. return non-fluorescence after re-treatment alkaline solution de-protonation process reverses effect restoring their original reversible pH-sensitivity is valuable asset various applications. synthesized exhibited change intensity acidic conditions, transitioning conditions back media. Density Functional Theory (DFT) calculations revealed N-doping resulted narrower energy gap (0.2779 eV compared 0.3199 higher dipole moment (2.640 Debye), enhancing reactivity towards protons leading more pronounced across different conditions. displayed dual emission peaks at 443.00 nm 502.00 excitation 350 nm, contour maps (FCM) confirmed multicolor capabilities. calculated quantum yield was notably high 37.76%. Fourier Transform Infrared (FTIR) spectroscopy successful incorporation sulfur (S-H 2368 cm⁻1, C-S 750 cm⁻1) nitrogen (N-H 3552 C-N 989 functionalities into dot structure. Furthermore, Molecular Electrostatic Potential (ESPM) mapping indicated regions negative potential around OH, C=O groups, particularly basic supporting sensitivity.

Language: Английский

Towards sustainable quantum dots: Regulatory framework, toxicity and emerging strategies DOI
Carlotta Campalani, Jean‐Christophe M. Monbaliu

Materials Science and Engineering R Reports, Journal Year: 2025, Volume and Issue: 163, P. 100940 - 100940

Published: Jan. 29, 2025

Language: Английский

Citations

1
Colloidal InAs Quantum Dots: Synthesis, Properties, and Optoelectronic Devices DOI Open Access

Changjian Hu,

Ali Imran Channa, Xia Li

et al.

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 12, 2025

Abstract Colloidal indium arsenide (InAs) quantum dots (QDs) have emerged as a compelling class of advanced low‐dimensional materials due to their excellent near‐infrared (NIR) optical properties and compliance with restriction hazardous substances (RoHS) standard, showing great potential in various photovoltaics, light emission/conversion, sensing applications. Here, variety synthetic techniques for preparing high‐quality InAs QDs, including hot‐injection, seeded growth cation exchange, are thoroughly reviewed. To realize tailored optoelectronic properties, diverse strategies such surface passivation, doping, alloying, shape control QDs discussed detail, which applicable fabricate high‐performance QDs‐based devices, encompassing solar cells, light‐emitting diodes, photodetectors field‐effect transistors. Moreover, the main challenges future research directions briefly proposed, providing guidelines achieve low‐cost, heavy metal‐free, high‐efficiency stable NIR optoelectronics toward commercialization.

Language: Английский

Citations

1
Advancing Ecofriendly Indium Phosphide Quantum Dots: Comprehensive Strategies toward Color-Pure Luminescence for Wide Color Gamut Displays DOI
Jie Zhao, Rui Jiang,

Ming-De Huang

et al.

ACS Energy Letters, Journal Year: 2025, Volume and Issue: unknown, P. 2096 - 2132

Published: April 4, 2025

Language: Английский

Citations

0
Artistic anti-counterfeiting with a pH-responsive fluorescent ink using DFT and molecular electrostatic potential mapping insights DOI Creative Commons

Hebat‐Allah S. Tohamy

Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)

Published: June 2, 2025

The observed fluorescence behavior of the sulfur, nitrogen-doped carbon dots (S, N-CDs) ink which derived from onion peel wastes (OW) demonstrates its pH-sensitive nature, making it suitable for applications where visual or fluorescent changes upon pH variation are desired. initial lack under UV light suggests that S, N-CDs in a non-fluorescent state. However, treatment with acid, exhibits faint yellow color and fluoresces light. This indicates shift electronic structure N-CDs, likely due to protonation. return non-fluorescence after re-treatment alkaline solution de-protonation process reverses effect restoring their original reversible pH-sensitivity is valuable asset various applications. synthesized exhibited change intensity acidic conditions, transitioning conditions back media. Density Functional Theory (DFT) calculations revealed N-doping resulted narrower energy gap (0.2779 eV compared 0.3199 higher dipole moment (2.640 Debye), enhancing reactivity towards protons leading more pronounced across different conditions. displayed dual emission peaks at 443.00 nm 502.00 excitation 350 nm, contour maps (FCM) confirmed multicolor capabilities. calculated quantum yield was notably high 37.76%. Fourier Transform Infrared (FTIR) spectroscopy successful incorporation sulfur (S-H 2368 cm⁻1, C-S 750 cm⁻1) nitrogen (N-H 3552 C-N 989 functionalities into dot structure. Furthermore, Molecular Electrostatic Potential (ESPM) mapping indicated regions negative potential around OH, C=O groups, particularly basic supporting sensitivity.

Language: Английский

Citations

0