Manipulating chemistry through nanoparticle morphology.,Nanoscale Horizons

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Manipulating chemistry through nanoparticle morphology.
Nanoscale Horizons ( IF 8.0 ) Pub Date : 2019-08-07 , DOI: 10.1039/c9nh00456d
Lucio Litti ₁ , Javier Reguera ₂ , F Javier García de Abajo ₃ , Moreno Meneghetti ₁ , Luis M Liz-Marzán ₄

Affiliation

We demonstrate that the protonation chemistry of molecules adsorbed at nanometer distances from the surface of anisotropic gold nanoparticles can be manipulated through the effect of surface morphology on the local proton density of an organic coating. Direct evidence of this remarkable effect was obtained by monitoring surface-enhanced Raman scattering (SERS) from mercaptobenzoic acid and 4-aminobenzenethiol molecules adsorbed on gold nanostars. By smoothing the initially sharp nanostar tips through a mild thermal treatment, changes were induced on protonation of the molecules, which can be observed through changes in the measured SERS spectra. These results shed light on the local chemical environment near anisotropic colloidal nanoparticles and open an alternative avenue to actively control chemistry through surface morphology.

中文翻译：

通过纳米颗粒形态控制化学反应。

我们证明，可以通过表面形态对有机涂层局部质子密度的影响来操纵从各向异性金纳米颗粒表面纳米距离处吸附的分子的质子化化学。通过监测巯基苯甲酸和吸附在金纳米星上的4-氨基苯硫醇分子的表面增强拉曼散射（SERS），可以得到这种显着效果的直接证据。通过温和的热处理使最初尖锐的纳米星尖端变光滑，就可以诱导分子质子化的变化，这可以通过测得的SERS光谱变化来观察。这些结果揭示了各向异性胶体纳米颗粒附近的局部化学环境，并为通过表面形态主动控制化学性质开辟了另一条途径。

更新日期：2019-12-17

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