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Controlling chemical interface damping by removing aromatic monothiol and dithiol groups from gold nanorods using sodium borohydride solution
Analyst ( IF 3.6 ) Pub Date : 2024-12-02 , DOI: 10.1039/d4an01187b
Ji Min Kim, Ji Won Ha

Chemical interface damping (CID) in gold nanorods (AuNRs) significantly influences their optical properties due to the direct transfer of hot electrons from the AuNRs to adsorbed molecules. Despite ongoing research on CID, reversible tuning of CID at the single particle level remains a challenging task. In this study, we investigated the adsorption and removal of thiol-functionalized aromatic molecules, specifically thiophenol (TP) and benzene-1,2-dithiol (BDT), using sodium borohydride (NaBH4) solution as a reagent, with confirmation through surface-enhanced Raman scattering (SERS) measurements. We further examined the effect of NaBH4 solution pH, immersion time in solution, and the number of thiol groups in the adsorbate (TP and BDT) on removal efficiency from the AuNR surfaces. Additionally, we extended this approach to directly control CID in single AuNRs via the adsorption and desorption of TP and BDT molecules under dark-field microscopy and spectroscopy. Therefore, this study provides insights into the removal of aromatic thiol molecules using NaBH4, as well as the direct control of CID in individual AuNRs.

中文翻译:


通过使用硼氢化钠溶液去除金纳米棒中的芳香族单硫醇和二硫醇基团来控制化学界面阻尼



由于热电子从 AuNR 直接转移到吸附分子,金纳米棒 (AuNR) 中的化学界面阻尼 (CID) 显着影响其光学性质。尽管对 CID 的研究正在进行中,但在单粒子水平上对 CID 进行可逆调谐仍然是一项具有挑战性的任务。在本研究中,我们以硼氢化钠 (NaBH4) 溶液为试剂,研究了硫醇官能化芳香族分子的吸附和去除,特别是硫酚 (TP) 和苯-1,2-二硫醇 (BDT),并通过表面增强拉曼散射 (SERS) 测量进行确认。我们进一步研究了 NaBH4 溶液 pH 值、在溶液中的浸泡时间以及吸附物中硫醇基团的数量(TP 和 BDT)对 AuNR 表面去除效率的影响。此外,我们扩展了这种方法,通过在暗场显微镜和光谱下吸附和解吸 TP 和 BDT 分子来直接控制单个 AuNRs 中的 CID。因此,本研究为使用 NaBH4 去除芳香族硫醇分子以及直接控制单个 AuNR 中的 CID 提供了见解。
更新日期:2024-12-04
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