News Column

Study Findings from National Center for Nanoscience and Technology Broaden Understanding of Quantum Dots

May 27, 2014

By a News Reporter-Staff News Editor at Physics Week -- A new study on Quantum Dots is now available. According to news reporting originating in Beijing, People's Republic of China, by VerticalNews journalists, research stated, "Electrochemiluminescence resonance energy transfer (ECL-RET) based on dye-quantum dot (QD) hybrids, is a very powerful tool for chemical sensing and probing many important biological processes. In this work, we have investigated both electrochemiluminescence (ECL) and photoluminescence (PL) properties of the hybrid system, in which tris(2,2'-bipyridypruthenium(II) ([Ru(bpy)(3)](2+))/2-(dibutylamino)ethanol (DBAE) and QD are employed as the ECL donor and acceptor, respectively."

The news reporters obtained a quote from the research from National Center for Nanoscience and Technology, "Unexpectedly, we find that ECL of the [Ru(bpy)(3)](2+)/DBAE system can be efficiently quenched by various types of QDs. In addition, ECL quenching in the [Ru(bpy)(3)](2+)/DBAE system is independent of the core size and the surface charge of QDs, indicating that the quenching effect does not originate from resonance energy transfer between the [Ru(bpy)(3)](2+)/DBAE system and QDs. Photoluminescence properties of the hybrid system under electrochemical control and electron spin resonance (ESR) measurements further reveal that a charge transfer between QDs and the radical-state DBAE is responsible for ECL quenching in the [Ru(bpy)(3)](2+)/DBAE system. Contrary to previously published information, we propose that electron transfer, rather than energy transfer, dominates in the hybrid system under electrochemical control. We further demonstrate that such electron transfer could be switched to energy transfer by controlling the distance between [Ru(bpy)(3)](2+)/DBAE ECL and QDs."

According to the news reporters, the research concluded: "The energy/electron transfer process between [Ru(bpy)(3)](2+)/DBAE ECL and QDs is implemented to develop a novel platform for immune sensing."

For more information on this research see: Toward Understanding of Transfer Mechanism between Electrochemiluminescent Dyes and Luminescent Quantum Dots. Analytical Chemistry, 2014;86(8):3939-3946. Analytical Chemistry can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society -; Analytical Chemistry -

Our news correspondents report that additional information may be obtained by contacting T. Hu, Natl Center Nanosci & Technol, Beijing 100090, People's Republic of China. Additional authors for this research include X.F. Liu, S.Q. Liu, Z.L. Wang and Z.Y. Tang.

Keywords for this news article include: Asia, Beijing, Chemistry, Quantum Dots, Nanotechnology, Electrochemical, Quantum Physics, Emerging Technologies, People's Republic of China

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Source: Physics Week

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