Contrasting photocatalytic performance of quantum-dot sensitized p-type and n-type TiO2 hierarchical nanocomposites under visible light
- Title
- Contrasting photocatalytic performance of quantum-dot sensitized p-type and n-type TiO2 hierarchical nanocomposites under visible light
- Author
- 박태주
- Keywords
- TiO2; p-type; n-type; Quantum-dots; Nanocomposites; Photocatalysis
- Issue Date
- 2023-10-15
- Publisher
- ELSEVIER SCIENCE SA
- Citation
- MATERIALS CHEMISTRY AND PHYSICS, v. 308, article no. 128233, page. 1-9
- Abstract
- In recent times, titanium dioxide (TiO2) has acquired greater attention owing to its efficient photocatalytic activity, low cost, stability, non-corrosive, high availability, and nontoxicity towards the environment and humans. However, two major drawbacks including a wide band gap of around-3.2 eV and a high recombination rate of the photogenerated charge carriers restrict its capability in practical application. In this work, we deposited metal chalcogenide-based quantum-dots of lead sulfide (PbS QDs) on P25-, p-type and n-type TiO2 nanoparticles by pseudo-successive ionic layer adsorption and reaction (p-SILAR) process to form hierarchical nanocomposite and studied the corresponding photocatalytic activity under visible light. Concurrently, improved optoelectronic characteristics were recorded for n-TiO2/PbS hierarchical nanocomposite due to low charge recombination evidenced from photoluminescence (PL) spectra and optimum PbS deposition evidenced from EDX analysis as compared to p-TiO2 and P25-TiO2. The n-TiO2/PbS hierarchical nanocomposite degrades 74.4% RhB dye under visible light in 120 min. The structural, morphological, and photocatalytic characteristics were investigated by scanning and transmission electron microscopy, PL spectra, UV-Vis spectrophotometry, and Fourier transforms infrared spectra. This work might offer new understandings on P25-, p-and n-TiO2/PbS hierarchical nano composites with improved photocatalytic performance for visible-light activated degradation of RhB.
- URI
- https://www.sciencedirect.com/science/article/pii/S0254058423009410https://repository.hanyang.ac.kr/handle/20.500.11754/190695
- ISSN
- 0254-0584
- DOI
- https://doi.org/10.1016/j.matchemphys.2023.128233
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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