Material Science

CLC number: O232;O193

Quenching Fluorescence of Quantum Dots by Using Gold Nanocrystals in Quantum and Classical Size Regime

¹ School of Electronic Engineering and Intelligent Manufacturing, Anqing Normal University, Anqing 246133, Anhui, China
² School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, Hubei, China
³ Institute of Mathematics and Physics, Central South University of Forestry and Technology, Changsha 410004, Hunan, China
⁴ School of Physics and Technology, Wuhan University, Wuhan 430072, Hubei, China

^† To whom correspondence should be addressed. E-mail: dingsijing@cug.edu. cn;
qqwang@whu.edu.cn

Received: 16 August 2021

Abstract

This paper investigates the factors which can influence the quenching effect from the perspective of energy transfer. The quenched fluorescence of the CdSe semiconductor quantum dots (SQDs) by using plasmonic Au nanocrystals (p-AuNCs) and molecule-like Au nanocrystals (m-AuNCs) in aqueous suspensions and spin-coated films is comparatively investigated. In the aqueous suspensions, the p-AuNCs have larger quenching effect than the m-AuNCs. In the spin-coated films, the p-AuNCs and m-AuNCs have comparable quenching factor. Furthermore, the experiments show that the p-AuNCs simultaneously enhance the radiative and nonradiative rates. But the m-AuNCs only enhance the nonradiative rate of the SQDs, which reveals the difference of quenching process between the p-AuNCs and m-AuNCs. This result of the research has guiding significance for the detection technique based on the fluorescence quenching.