Reactivity Toward Ag+: A General Strategy to Generate a New Emissive Center from NIR-Emitting Gold Nanoparticles,The Journal of Physical Chemistry Letters

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Reactivity Toward Ag+: A General Strategy to Generate a New Emissive Center from NIR-Emitting Gold Nanoparticles
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2018-01-19 00:00:00 , DOI: 10.1021/acs.jpclett.7b03295
Yaping Wang ₁ , Lulu Liu ₁ , Lingshan Gong ₁ , Ying Chen ₁ , Jinbin Liu ₁

Affiliation

We report a facile strategy for the transformation of single NIR-emitting AuNPs to dual-NIR-emitting bimetallic [email protected] based on the robust reactivity toward Ag(I) ions under mild conditions. The reactivities toward Ag(I) ions were found to be significantly different between visible- and NIR-emitting glutathione (GSH)-coated AuNPs: the high GSH surface coverage on the 610 nm-emitting AuNPs resulted in a reversible interaction due to enough surface steric hindrance to resist Ag(I) ions from interaction with the Au(0) core, whereas the low GSH surface coverage on the 810 nm-emitting AuNPs led to both antigalvanic reaction and Ag(I)-carboxylate shell formation on the surface of the AuNPs, which were responsible for the formation of a new emissive center at 705 nm. This strategy was also demonstrated to exhibit excellent generalization toward various NIR-emitting AuNPs with surface chemistries containing carboxyl groups, opening a new pathway of tailoring the optical properties of metallic NPs through surface reactivity.

中文翻译：

对Ag ^+的反应性：从发射NIR的金纳米粒子产生新的发射中心的一般策略

我们报告了一个温和的条件下，基于对Ag（I）离子的稳固反应性，将单个发射NIR的AuNPs转换为发射双NIR的双金属[电子邮件保护]的简便策略。发现涂覆可见光和NIR的谷胱甘肽（GSH）的AuNPs对Ag（I）离子的反应性显着不同：由于表面足够多，发射610 nm的AuNPs的GSH表面覆盖率高，导致可逆的相互作用阻止Ag（I）离子与Au（0）核相互作用的空间位阻，而发射810 nm的AuNPs的低GSH表面覆盖率导致抗电反应和Ag（I）-羧酸盐壳形成AuNPs负责在705 nm处形成新的发射中心。

更新日期：2018-01-19

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