Development of silver nanomaterials as spectrally selective absorbers

Abstract

This research presents a novel approach to the synthesis and characterisation of silver nanoparticles (AgNPs), with a specific focus on anisotropic silver nanorods (AgNRs). Unlike previous studies that primarily concentrated on batch synthesis methods, this work pioneers the integration of continuous flow synthesis for scalable, controlled production of AgNRs. The continuous flow method ensures improved reproducibility, scalability, and control over reaction conditions, addressing major challenges in batch synthesis. This research also introduces innovative reactor designs, including 3D-printed continuous flow reactors, demonstrating their efficiency in producing AgNRs with aspect ratios tailored for near-infrared (NIR) absorption.

A key contribution of this thesis is the systematic optimisation of synthesis parameters to achieve enhanced control over the size, shape, and optical properties of AgNRs. This optimisation fine-tunes the aspect ratio of AgNRs to ensure NIR absorption, which is critical for applications such as stealth technology and photonic devices. The research also establishes strong correlations between synthesis conditions and localised surface plasmon resonance (LSPR), leading to precise optical performance.

Furthermore, the thesis advances the application of AgNRs by successfully integrating them into polymer matrices. The development of a silver-polymer nanocomposite was achieved by embedding AgNRs within a polymethyl methacrylate (PMMA) matrix, enhancing the composite's optical properties. These nanocomposites exhibit enhanced NIR absorption, positioning them as potential candidates for infrared shielding materials, solar energy harvesting, and stealth technology.

The findings contribute to the field of nanomaterials by demonstrating the effectiveness of continuous flow synthesis in producing functionalised AgNRs for industrial applications. Future research is recommended to focus on the further improvement of flow process and functionalisation of AgNRs and refining the polymer nanocomposite technology for enhanced performance in optical and related applications. The potential for scaling up the continuous flow synthesis for silver nanoparticle production are also discussed as crucial steps towards sustainable development in nanotechnology.

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Identifiers

ORCID for Xunli Zhang: orcid.org/0000-0002-4375-1571

ORCID for Eugen Stulz: orcid.org/0000-0002-5302-2276

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