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Differential role of PVP on the synthesis of plasmonic gold nanostructures and their catalytic and SERS properties

机译：PVP在等离子体金纳米结构的合成中的不同作用及其催化和SERS性能

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摘要

We have systematically utilized the simple yet uncommon XRD measurements together with FTIR data for not only quantifying the phase purity of as-synthesized Au nanoparticles, but also for meticulously interpreting the differential role of PVP in conjunction with its halide modified counterpart in the in situ fine-tuning of the nanoparticle growth. We thereby illustrate the robustness of the present synthetic protocol, further substantiating our relentless quest in achieving size/shape tunable metal nanostructures with high precision/yield by solely utilizing the full potential of the versatile polymer, polyvinyl pyrrolidone (PVP). Sincere efforts were undertaken in corroborating the optical plasmonic signatures of the different as-prepared Au nanostructures with the corresponding TEM measurements. Further, the comparative catalytic (4-nitroaniline to para-phenylenediamine) as well as surface enhanced raman scattering (of crystal violet dye molecules) investigations distinctly demonstrate a constructive structure-property correlation among the different Au nanostructures stabilized by the same polymer, the varied surface conformations of which solely dictate the physico-chemical properties in an illustrious manner, thereby establishing a new paradigm for better quantification of complex metal nanoarchitectures in general.
机译：我们系统地利用了简单但不常见的XRD测量值和FTIR数据，不仅定量了合成的Au纳米颗粒的相纯度，而且还仔细地解释了PVP及其卤代修饰物在原位精制中的不同作用。 -调整纳米颗粒的生长。因此，我们阐述了本合成方案的鲁棒性，进一步证实了我们通过仅利用通用聚合物聚乙烯吡咯烷酮（PVP）的全部潜力，以高精度/高产量实现尺寸/形状可调金属纳米结构的不懈追求。在用相应的TEM测量值证实了不同制备的Au纳米结构的光学等离子体特征方面，我们进行了真诚的努力。此外，比较的催化（4-硝基苯胺到对苯二胺）以及（结晶紫染料分子的）表面增强拉曼散射研究清楚地表明了由相同聚合物稳定的不同Au纳米结构之间的结构性-性质相关性，表面构象仅以一种杰出的方式决定了其理化性质，从而建立了一个新的范式，以更好地定量通常的复杂金属纳米结构。

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