Copper-Doped Hydroxyapatite Characterization and Applications

Copper-doped hydroxyapatite (Cu-HAp) represents an evolution of calcium phosphate bioceramics in which copper ions are introduced into the hydroxyapatite lattice to impart new functionalities. Structural characterisation techniques such as X-ray diffraction, Raman spectroscopy, nuclear magnetic resonance and X-ray photoelectron spectroscopy have delineated the manner in which Cu²⁺ and Cu⁺ substitute for calcium or occupy interstitial channels, often generating lattice distortions and oxygen vacancies. Electron microscopy and surface area analyses reveal that synthesis route and heat treatment govern crystal size, morphology and phase purity. Functionally, Cu-HAp has demonstrated potent antibacterial activity, controlled ion release for bone regeneration, catalytic performance in aqueous pollution degradation and potential imaging contrast enhancement. Thermal and mechanochemical studies have further mapped copper ion diffusion and phase transformations under sintering, informing strategies to balance bioactivity, mechanical integrity and thermal stability for orthopaedic, dental and environmental applications.

Research from Nature Portfolio

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Research from all publishers

Recent investigations have expanded understanding of synthesis–structure–function relationships in Cu-HAp. One study on antibacterial efficacy compared solid-state and wet-chemical routes, finding that Cu⁺ insertion into the hydroxyapatite channel increases unit cell volume and yields broad-spectrum antimicrobial performance, with wet-chemically produced powders showing finer particles, larger surface areas and superior bacterial inhibition. Heat-treatment experiments have elucidated copper ion diffusion during sintering, revealing that Cu-substituted HAp remains single-phase up to mid-range temperatures but progressively forms CuO-enriched phases above 600 °C; these transformations critically influence both thermal stability and in vivo ion release. In the environmental domain, Cu-HAp nanocatalysts have been employed for aqueous-phase phenol hydroxylation using hydrogen peroxide, achieving over 60 % conversion and high selectivity to dihydroxybenzenes under mild conditions, while maintaining activity through multiple reaction cycles. Together, these studies underscore the versatile utility of Cu-HAp materials across biomedical and catalytic applications.

Copper-Doped Hydroxyapatite Characterization and Applications publication trend

The graph below shows the total number of articles in copper-doped hydroxyapatite characterization and applications across all publications each year (not limited to Nature Index journals).

Technical terms

Doping: Introduction of foreign ions into a host crystal lattice to modify its properties.

Hydroxyapatite (HAp): A calcium phosphate mineral, Ca₁₀(PO₄)₆(OH)₂, analogous to the mineral component of bone and teeth.

Interstitial site: A position within a crystal lattice not normally occupied by host atoms, allowing for incorporation of smaller ions.

Substitutional site: A lattice position where an ion replaces a host atom, altering local geometry and charge balance.

Oxygen vacancy: A point defect in the lattice where an oxygen ion is missing, affecting electrical, optical and chemical behaviour.

Catalytic hydroxylation: A reaction in which hydroxyl groups are introduced into an organic compound, often facilitated by a catalyst and oxidant.

References

1. Aqueous-phase catalytic hydroxylation of phenol with H 2 O 2 by using a copper incorporated apatite nanocatalyst. RSC Advances (2019).
2. Crystal Chemistry and Antibacterial Properties of Cupriferous Hydroxyapatite. Materials (2019).
3. Diffusion of Copper Ions in the Lattice of Substituted Hydroxyapatite during Heat Treatment. Materials (2022).