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Determination of quantum size effect of colloidal SiC quantum dots by cyclic voltammetry

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Abstract

Colloidal SiC quantum dots (QDs) is a promising material for wavelength downconversion in optoelectronics and photovoltaics due to their outstanding properties, including high chemical resistance, high photoluminescence, and tunable size-dependent bandgap. TEM analysis revealed that the average particle diameter of the colloidal SiC QDs was 2.02 nm, 1.75 nm, 1.18 nm, and 1.15 nm for samples etched for 30 min, 1 h, 1 h 30 min, and 2 h, respectively. HRTEM analysis showed that the lattice spacing was 0.29 nm, corresponding to the (111) plane of bulk cubic 3C-SiC. The optical bandgap of the unetched sample was 2.26 eV, with no prominent emission peak. The optical bandgaps of the etched colloidal SiC QDs samples were calculated to be between 2.55 eV and 3.09 eV for samples etched for 30 min and 2 h, respectively, which increased due to the decrease in particle size and the resulting increased coulombic interaction between electron–hole pairs. The electrochemical HOMO–LUMO gap of colloidal 3C-SiC QDs was determined by cyclic voltammetry, which showed a similar trend with the optical bandgaps of the QDs. The colloidal SiC QDs exhibited strong-blue-shifted emission at ~ 483 nm (2.56 eV) for the sample etched for 2 h, compared to a peak at 501 nm (2.48 eV) for the sample etched for 1 h. The sample etched for 2 h also showed a large Stokes shift of ~ 277 nm, which is a desired feature for wavelength down-conversion.

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Acknowledgements

I want to thank the School of Physics, Universiti Sains Malaysia for providing conducive environment and facilities for this research work. I also want to acknowledge the Federal Polytechnic Offa, Kwara State, Nigeria for my postgraduate sponsorship via Tertiary Education Trust Fund (TETFUND).

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  1. Nano-Optoelectronics Research and Technology Laboratory, School of Physics, Universiti Sains Malaysia (USM), 11800, Penang, Malaysia

    Abdulmutolib O. Olaoye, Muhammad Sani, Mahayatun D. J. Ooi, Mohd Zamir Pakhuruddin, Md. Roslan Hashim & Marzaini Rashid

  2. Department of Applied Physics, Federal Polytechnic Offa, P. M. B. 420, Offa, Kwara State, Nigeria

    Abdulmutolib O. Olaoye

  3. Department of Physics, Federal University of Lafia, P. M. B. 146, Lafia, Nasarawa State, Nigeria

    Muhammad Sani

  4. Institute of Nano Optoelectronics Research and Technology, Universiti Sains Malaysia, 11800, Penang, Malaysia

    Mohd Zamir Pakhuruddin

  5. Materials Technology Research Group (MaTReC), School of Chemical Sciences, Universiti Sains Malaysia, 11800, Penang, Minden, Malaysia

    Mohd Hazwan Hussin

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Contributions

Olaoye Abdulmutolib Olajide: Conceptualization, Preparation, Characterization, Data curation, Writing original draft. Muhammad Sani: Writing review & editing. Mahayatun D. J. Ooi: CV characterization, Resources. Mohd Hazwan Hussin: Resource. Mohd Zamir Pakhuruddin: Investigation, Resource. Md. Roslan Hashim: Investigation, Resources. Marzaini Rashid: Conceptualization, Investigation, Writing-review & editing, Supervision.

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Olaoye, A.O., Sani, M., Ooi, M.D.J. et al. Determination of quantum size effect of colloidal SiC quantum dots by cyclic voltammetry. emergent mater. (2024). https://doi.org/10.1007/s42247-024-00714-0

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