Photocatalytic Properties of Semiconductor Nanoparticles

Semiconductor nanoparticles harness light energy to drive redox reactions at their surfaces, offering sustainable routes to environmental remediation, hydrogen production and chemical synthesis. Their high surface‐to‐volume ratio amplifies active sites, while size‐tunable band gaps enable absorption across ultraviolet and visible wavelengths. Photoexcitation generates electron–hole pairs that migrate to the surface, where electrons reduce target molecules and holes oxidise contaminants or water. Strategies to enhance charge separation include doping, heterojunction formation and cocatalyst loading. Quantum confinement in particles below the exciton Bohr radius modifies electronic structure, widening band gaps and shifting absorption spectra. Core–shell architectures, magnetic supports and polymeric membranes improve stability, recyclability and recovery, making these nanomaterials prime candidates for wastewater treatment, solar fuels and antimicrobial applications.

Research from Nature Portfolio

Recent studies have shown that magnetic core–shell ZnS–CdS heterostructures with optimised molar ratios extend light absorption into the visible region and suppress electron–hole recombination, achieving over 95 % removal of methylene blue and textile dyes under economical high‐pressure mercury lamps. A foundational demonstration of photoinduced water splitting using titanium dioxide electrodes under ultraviolet irradiation established the concept of semiconductor photocatalysis, inspiring modern approaches to band‐gap engineering and hierarchical nanoarchitectures.

Photocatalytic Properties of Semiconductor Nanoparticles publication trend

The graph below shows the total number of articles in photocatalytic properties of semiconductor nanoparticles across all publications each year (not limited to Nature Index journals).

Technical terms

Band gap: Energy difference between valence and conduction bands dictating the onset wavelength of light absorption.

Electron–hole recombination: Loss process in which photogenerated electrons and holes reunite, reducing photocatalytic efficiency.

Heterojunction: Interface between dissimilar semiconductors that promotes spatial separation of charge carriers.

Quantum confinement: Phenomenon where reducing nanoparticle size leads to discrete energy levels and band-gap widening.

References

1. Photocatalytic degradation of methyl orange dye by pristine titanium dioxide, zinc oxide, and graphene oxide nanostructures and their composites under visible light irradiation. Applied Nanoscience (2017).
2. Visible Light-Driven Photocatalytic Rhodamine B Degradation Using CdS Nanorods. Processes (2021).
3. Sustainable Synthesis of Cadmium Sulfide, with Applicability in Photocatalysis, Hydrogen Production, and as an Antibacterial Agent, Using Two Mechanochemical Protocols. Nanomaterials (2022).