In the field of modern nanoscience, the ability to tailor the properties of nanoparticles is essential for advancing their applications. A key approach for achieving this control involves manipulating surface plasmon resonance (SPR) to modify optical properties. This study introduces a novel method for synthesizing gold nanoparticles capped with photoactive liquid crystalline azo ligands, accomplished without reducing agents. Comprehensive structural characterization was performed using Fourier-transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), ultraviolet-visible (UV-Vis) spectroscopy, powder X-ray diffraction (PXRD), and high-resolution transmission electron microscopy (HRTEM). Photophysical investigations, including time-dependent UV-Vis and fluorescence spectroscopy, provided insights into the modulation of SPR. The mesomorphic behavior of the azo ligands was examined through polarized optical microscopy (POM), differential scanning calorimetry (DSC), and X-ray diffraction (XRD), revealing a chiral lamellar superstructure confirmed by circular dichroism (CD) spectroscopy. Notably, the photoactive azo ligands demonstrated significant control over SPR peak modulation, enabling precise manipulation of nanoparticle size and arrangement. This research highlights the potential of photoactive ligands in the design of nanoparticles with tailored optical properties, paving the way for innovative applications in various fields.

中文翻译：

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通过光活性液晶偶氮配体调节金纳米颗粒的光学特性


在现代纳米科学领域，定制纳米颗粒特性的能力对于推进其应用至关重要。实现这种控制的关键方法涉及操纵表面等离子体共振 （SPR） 来改变光学特性。本研究介绍了一种合成封端有光活性液晶偶氮配体的金纳米颗粒的新方法，无需还原剂即可完成。使用傅里叶变换红外光谱 （FTIR）、核磁共振 （NMR）、紫外-可见光 （UV-Vis） 光谱、粉末 X 射线衍射 （PXRD） 和高分辨率透射电子显微镜 （HRTEM） 进行全面的结构表征。光物理研究，包括时间依赖性紫外-可见分光光度计和荧光光谱，为了解 SPR 的调节提供了见解。通过偏振光学显微镜 （POM）、差示扫描量热法 （DSC） 和 X 射线衍射 （XRD） 检查偶氮配体的介晶行为，揭示了由圆二色性 （CD） 光谱证实的手性层状超结构。值得注意的是，光活性偶氮配体表现出对 SPR 峰调制的显着控制，能够精确操纵纳米颗粒的大小和排列。这项研究强调了光活性配体在设计具有定制光学特性的纳米颗粒方面的潜力，为各个领域的创新应用铺平了道路。