SYNTHESIS AND OPTICAL CHARACTERIZATION OF TiO₂ NANORODS COUPLED WITH CdTe QUANTUM DOTS

Phạm Thị Thủy; Nguyễn Thanh Quyên

doi:10.34238/tnu-jst.12554

SYNTHESIS AND OPTICAL CHARACTERIZATION OF TiO₂ NANORODS COUPLED WITH CdTe QUANTUM DOTS

About this article

Received: 11/04/25 Revised: 16/06/25 Published: 17/06/25

Authors

1. Pham Thi Thuy , Sai Gon University
2. Nguyen Thanh Quyen, 1) Sai Gon University, 2) Le Thi Hong Gam High School

Abstract

In this study, TiO₂ nanorods coupled with CdTe semiconductor quantum dots were fabricated by hydrothermal method. The shape, size, vibrational characteristics and optical properties of the samples were studied using SEM, HRTEM, Raman scattering, absorption and fluorescence emission spectra. The results showed that CdTe quantum dots with a size of about 7-8 nm were successfully attached to TiO₂ nanorods with a diameter of about 70-80 nm. The UV-Vis absorption spectrum shows a significant broadening of the optical absorption band from UV to visible after CdTe doping. The fluorescence spectrum records a characteristic strong emission peak of CdTe quantum dots about ~ 660 nm, demonstrating the effectiveness of the TiO₂/CdTe heterojunction preparation. Attaching CdTe quantum dots to TiO₂ rods significantly improved the optical properties of the material, especially expanding the absorption band to the visible light region and changing the emission characteristics. This is an important premise for the development of highly efficient optoelectronic devices, solar cells, optical sensors or photocatalytic systems.

Keywords

TiO2 nanorods; CdTe; Quantum dot; Optical properties; Semiconductor

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References

[1] P. Phalswal, A. P. Raj, V. Singh, D. Khanna, and P. K. Khanna, “Green light emitting hydrophilic CdTe quantum dots with magic size signature,” Next Materials, vol. 3, 2024, Art. no. 100041.

[2] J. Yang and X. Zhong, “CdTe based quantum dot sensitized solar cells with efficiency exceeding 7% fabricated from quantum dots prepared in aqueous media,” J. Mater. Chem. A, vol. 4, pp. 16553-16561, 2016.

[3] H. Wu, W. Zhang, K. Li, and C. Liu, “Optical properties of CdTe quantum dots in silicate glasses containing CaO,” Optical Materials, vol. 148, 2024, Art. no. 114897.

[4] X. C. Nguyen, T. H. Nguyen, T. L. Nguyen, T. K. L. Vu, D. T. Luong, V. D. Phan, Q. B. Nguyen, and T. T. Pham, “Photoluminescence properties of CdTe/CdTeSe/CdSe core/alloyed/shell type-II quantum dots,” Journal of Alloys and Compounds, vol. 787, no. 30, pp. 823-830, 2019.

[5] M. A. Mahadik, G.W. An, S. David, S.H. Choi, M. Cho, and J. S. Jang, "Fabrication of A/R- TiO₂ composite for enhanced photoelectrochemical performance: Solar hydrogen generation and dye degradation," Appl. Surf. Sci, vol. 426, pp. 833-843, 2017.

[6] Y. Zhao, X. Gu, and Y. Qiang, "Influence of growth time and annealing on rutile TiO₂ single-crystal nanorod arrays synthesized by hydrothermal method in dye-sensitized solar cells," Thin Solid Films, vol. 520, no. 7, pp. 2814-2818, 2012.

[7] H. Hafez, Z. Lan, Q. Li, and J. Wu, "High-efficient dye-sensitized solar cell based on novel TiO₂ nanorod/ nanoparticle bilayer electrode," Nanotechnol. Sci. Appl, vol. 3, pp. 45-51, 2010.

[8] W. J. Lee and M. H. Hon, "An ultraviolet photo-detector based on TiO₂/water soild-liquid heterojunction," Appl. Phys. Lett, vol. 99, no. 25, 2011, Art. no. 251102.

[9] Z. Zhou, S.Yuan, J. Fan, Z. Hou, W.Zhou, Z. Du, and S.Wu, "CuInS₂ quantum dot-sensitized TiO₂ nanorod array photoelectrodes: synthesis and performance optimizatio," Nanoscale Research Letters, vol. 7, 2012, Art. no. 652.

[10] B. Liu and E. S. Aydil, "Growth of oriented single-crystalline rutile TiO₂ nanorods on transparent conducting substrates for dye-sensitized solar cell," J. Am. Chem. Soc, vol. 131, no. 11, pp. 3985-3990, 2009.

[11] J. Zhang, I. Yang, M. Liu, G. Li, S. Gao, and Y. Luo, "Fabrication of CdTe Quantum Dots Sensitized TiO₂ Nanorod-Array-Film Photoanodes via the Route of Electrochemical Atomic Layer Deposition," Journal of The Electrochemical Society, vol. 161, pp. D55-D58, 2014.

[12] M. Ye, M. Lev, C. Gong, W. Guo, and C. Lin, "Ultralong rutile TiO₂nanorod arrays with large surface area for CdS/CdSe quantum dot-sensitized solar cells," ElectrochemicaActa, vol. 121, pp. 175-182, 2014.

[13] S. Challagulla, K. Tarafder, R. Ganesan, and S. Roy, “Structure sensitive photocatalytic reduction of nitroarenes over TiO₂,” Scientific Reports, vol. 7, 2017, Art. no. 8783.

[14] T. V. Yuvaraj, D. Kumar, and R. R. Rao, "Growth of rutile TiO₂ nanorods on TiO₂ seed layer deposited by electron beam evaporation," Appl. Surf. Sci, vol. 258, pp. 4283-4287, 2012.

[15] H. L. Ma, J. Y. Yang, Y. Dai, and Y. B. Zhang, “Raman study of phase transformation of TiO₂ rutile single crystal irradiated by infrared femtosecond laser,” Appl. Surf. Sci, vol. 253, pp. 7497–7500, 2007.

[16] D. V. Pandi, N. Muthukumarasamy, S. Agilan, and D. Velauthapillai, "CdSe quantum dots sensitized ZnO nanorods for solar cell application," Materials Letters, vol. 223, pp. 227-230, 2018.

DOI: https://doi.org/10.34238/tnu-jst.12554

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