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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
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Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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Theoretically Manipulating Quantum Dots on Two-Dimensional TiO2 Monolayer for Effective Visible Light Absorption.

Ting Liao1, Ziqi Sun1, Shi Xue Dou1

  • 1Institute for Superconducting & Electronic Materials, University of Wollongong, Australia and ‡School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology , Brisbane, QLD 4000, Australia.

ACS Applied Materials & Interfaces
|February 21, 2017
PubMed
Summary

Researchers engineered visible light absorption using novel nanocontact systems of titanium dioxide (TiO2) monolayer and cadmium-based (CdX)13 nanocages. This approach enhances solar energy capture for improved photovoltaic and photocatalytic applications.

Keywords:
DFT calculationshybrid materialsmonolayersquantum dotssolar cells

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Renewable Energy

Background:

  • Low solar energy harvesting and conversion efficiency is a key challenge.
  • Difficulty in capturing solar energy across the wide solar spectrum, particularly visible light, hinders progress.

Purpose of the Study:

  • To engineer visible light absorption using a nanocontact system.
  • To explore the potential of two-dimensional (2D) TiO2 monolayer and II-VI semiconductor (CdX)13 nanocages.

Main Methods:

  • Formation of a nanocontact system between a 2D TiO2 monolayer and (CdX)13 (X = S, Se, Te) nanocages.
  • Analysis of the electronic band alignment and charge transfer mechanisms.
  • Investigating the effect of changing the element X on optical absorption properties.

Main Results:

  • An ideal type II band alignment was formed via Ti-X or Cd-O bond coupling.
  • Ti-X contact system demonstrated stronger donor-acceptor coupling, enhancing visible light absorption.
  • A red shift in absorption peaks was observed as X changed from S to Se to Te, stimulating optical response.

Conclusions:

  • Nanocontacting (CdX)13 nanocages with TiO2 monolayers promotes charge separation and visible light absorption.
  • These systems are promising for photovoltaic and photocatalytic applications due to their size, adsorbent nature, and efficient interfacial coupling.