Huang Qijia, Xia Younan
School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.
The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30332, United States.
Langmuir. 2025 Aug 5;41(30):20272-20279. doi: 10.1021/acs.langmuir.5c02610. Epub 2025 Jul 22.
While the synthesis of Ag nanocubes has been extensively studied, sample preparation (including collection, washing, and redispersion) after the synthesis has received far less attention. Herein, we leverage the unique capability of surface-enhanced Raman scattering to investigate how the solvent used for sample preparation affects the surface chemistry of Ag nanocubes. Our findings reveal that the use of an appropriate solvent for sample preparation plays a vital role in preserving the cubic shape. Crushing the reaction mixture with acetone before centrifugation greatly improves collection efficiency by inducing reversible aggregation among the particles. It also promotes the coadsorption of the carbonyl group from acetone and Cl ions on the Ag surface to suppress oxidative etching and thereby help preserve the cubic shape. Subsequent washing of the collected nanocubes with water or ethanol enables effective redispersion while facilitating the desorption of Cl ions and the adsorption of the carbonyl group from poly(vinylpyrrolidone). Collectively, these results underscore the importance of processing conditions after a colloidal synthesis in preserving the desired properties of Ag nanocubes for an array of applications.
虽然银纳米立方体的合成已得到广泛研究，但合成后的样品制备（包括收集、洗涤和重新分散）却很少受到关注。在此，我们利用表面增强拉曼散射的独特能力，来研究用于样品制备的溶剂如何影响银纳米立方体的表面化学性质。我们的研究结果表明，使用合适的溶剂进行样品制备在保持立方形状方面起着至关重要的作用。在离心前用丙酮粉碎反应混合物，通过诱导颗粒间的可逆聚集，极大地提高了收集效率。它还促进了丙酮中的羰基和氯离子在银表面的共吸附，以抑制氧化蚀刻，从而有助于保持立方形状。随后用水或乙醇洗涤收集到的纳米立方体，能够实现有效的重新分散，同时促进氯离子的解吸以及聚乙烯吡咯烷酮中羰基的吸附。总体而言，这些结果强调了胶体合成后处理条件在保持银纳米立方体一系列应用所需特性方面的重要性。
