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Studies of concentration dependence of the fluorescent quantum yield from rhodamine 6G and Au–Pd core–shell nanorods, using a response surface methodology

Ekkachai Rammarat, Kitsakorn Locharoenrat, Witoon Yindeesuk and Pattareeya Damrongsak

Department of Physics, Faculty of Science, King Mongkut’s Institute of Technology Ladkrabang, No. 1 Chalongkrung Road, Ladkrabang District, Bangkok 10520, Thailand
 

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Abstract. We have applied a response surface approach to study the fluorescence quantum yield (FQY) of rhodamine 6G (Rh6G) mixed with Au–Pd core–shell nanorods (Au–Pd NRs). The FQYs have been measured for the Rh6G concentrations varying from 3.53×10–7 to 1.70×10–6 mol/L and the concentrations of Au–Pd NRs from 7.06×10–6 to 1.36×10–4 mol/L. Our experimental results testify that the FQY depends notably on the proportions of Rh6G and Au–Pd NRs. A specific relationship between the FQY and the concentrations has also been confirmed by a response surface plot. It is found that the discrepancy between the experiment and the calculations is less than 2%.

Keywords: fluorescence, response surface methodology, nanorods

PACS: 33.50.Dq, 06.20.Dk, 78.67.Qa.
UDC: 535.37
Ukr. J. Phys. Opt. 18 179-186
doi: 10.3116/16091833/18/3/179/2017
Received: 13.07.2017

Анотація.  У цій праці застосовано підхід поверхні відгуку до вивчення квантового виходу флуоресценції (КВЛ) родаміну 6G (Р6G), змішаного з нанопаличками Au–Pd типу серцевина-оболонка (Au–Pd НП). КВЛ було виміряно для концентрацій Р6G у діапазоні від 3,53×10–7 до 1,70×10–6 моль/л і концентрацій Au–Pd НП від 7,06×10–6 до 1,36×10–4 моль/л. Експериментальні результати засвідчили, що КВЛ істотно залежить від пропорцій Р6G і Au–Pd НП. Конкретний взаємозв’язок між КВЛ і концентраціями також підтверджено графіком поверхні відгуку. Виявлено, що розбіжність між експериментом та розрахунком складає менше 2%.
 
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