Tuning Ag29 nanocluster light emission from red to blue with one and two-photon excitation

Nanoscale
Isabelle Russier-AntoineRodolphe Antoine

Abstract

We demonstrate that the tuning of the light emission from red to blue in dihydrolipoic acid (DHLA) capped Ag29 nanoclusters can be trigged with one and two photon excitations. The cluster stoichiometry was determined with mass spectrometry and found to be Ag29(DHLA)12. In a detailed optical investigation, we show that these silver nanoclusters exhibit a strong red photoluminescence visible to the naked eye and characterized by a quantum yield of nearly ∼2% upon one-photon excitation. In the nonlinear optical (NLO) study of the properties of the clusters, the two-photon excited fluorescence spectra were recorded and their first hyperpolarizability obtained. The two-photon absorption cross-section at ∼800 nm for Ag29(DHLA)12 is higher than 10(4) GM and the hyperpolarizability is 106 × 10(-30) esu at the same excitation wavelength. The two-photon excited fluorescence spectrum appears strongly blue-shifted as compared to the one-photon excited spectrum, displaying a broad band between 400 and 700 nm. The density functional theory (DFT) provides insight into the structural and electronic properties of Ag29(DHLA)12 as well as into interplay between metallic subunit or core and ligands which is responsible for unique optical properties.

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Citations

Jan 10, 2017·Chemical Communications : Chem Comm·Jatish KumarTakuya Nakashima
Nov 24, 2016·Nanoscale·Marte van der LindenAndries Meijerink
Mar 1, 2018·Annual Review of Physical Chemistry·K L Dimuthu M WeerawardeneChristine M Aikens
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May 14, 2019·Physical Chemistry Chemical Physics : PCCP·Hussein FakhouriRodolphe Antoine
Jul 12, 2019·Chemical Society Reviews·Joanna Olesiak-BanskaMarek Samoc
Mar 19, 2020·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Yong LiuJianping Xie
Aug 8, 2020·Chemical Society Reviews·Xi KangRongchao Jin
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May 1, 2018·Physical Chemistry Chemical Physics : PCCP·Dinesh MishraHedi Mattoussi
Dec 18, 2020·Nanoscale·Goonay YousefalizadehKevin G Stamplecoskie
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