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<p>Gold nanoparticles (AuNPs) were synthesized within spin-coated lysozyme thin films by varying the concentration of chloroauric acid (HAuCl<sub>4</sub>) in the lysozyme solution. The out-of-plane structure and surface morphology of the AuNP-embedded lysozyme thin films were characterized using X-ray reflectivity (XRR) and atomic force microscopy (AFM), while transmission electron microscopy (TEM) confirmed the formation of AuNPs within the protein matrix. Photoluminescence spectroscopy was employed to investigate the emission behavior of both lysozyme and the AuNPs, and time-dependent emission measurements were used to monitor nanoparticle growth at different HAuCl<sub>4</sub> concentrations. Combined XRR and TEM analyses indicate that the embedded AuNPs predominantly exhibit a disc-like morphology, whereas TEM further reveals the formation of relatively larger nanoparticles (diameter ≈ 90 nm) at the highest HAuCl<sub>4</sub> concentration (2 mM). The growth of AuNPs within the confined protein thin films follows an exponential (Langmuir-like) growth behavior.</p>

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Growth of gold nanoparticles inside lysozyme thin film with variation of chloroauric acid concentration

  • 期刊论文

  • 发表日期：

    2026年8月1日

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  • Suresh Kumar,
  • Sanu Sarkar,
  • Sarathi Kundu

摘要

Gold nanoparticles (AuNPs) were synthesized within spin-coated lysozyme thin films by varying the concentration of chloroauric acid (HAuCl4) in the lysozyme solution. The out-of-plane structure and surface morphology of the AuNP-embedded lysozyme thin films were characterized using X-ray reflectivity (XRR) and atomic force microscopy (AFM), while transmission electron microscopy (TEM) confirmed the formation of AuNPs within the protein matrix. Photoluminescence spectroscopy was employed to investigate the emission behavior of both lysozyme and the AuNPs, and time-dependent emission measurements were used to monitor nanoparticle growth at different HAuCl4 concentrations. Combined XRR and TEM analyses indicate that the embedded AuNPs predominantly exhibit a disc-like morphology, whereas TEM further reveals the formation of relatively larger nanoparticles (diameter ≈ 90 nm) at the highest HAuCl4 concentration (2 mM). The growth of AuNPs within the confined protein thin films follows an exponential (Langmuir-like) growth behavior.