Fluorescent detection is a very attractive subject on determinating pesticides. However, the most chemosensors utilized in fluorescent detection are developed based on organic dyes or quantum dots, suffering from instability, high background noise and interfering from other organic impurities that can also be excited by UV radiation. In present research, we developed a novel NaYF4:Yb,Ho/Au nanocomposites-based chemosensor with high sensitivity (10 ppb) and selectivity over competing analytes for detection of cartap possessing acute toxicity, which is excited with a 970-nm laser instead of the UV radiation to give emission peak at 541 nm. In the presence of the cartap, the nanocomposites are aggregated, resulting in enhanced luminescence resonance energy transfer between NaYF4:Yb,Ho nanocrystals and gold nanoparticles. There is a linear relationship between the relative intensity of luminescence at 541 nm and the concentration of cartap. Based on this, the developed nanosensor successfully detected cartaps in vegetables with satisfactory results.

Highly selective and sensitive cartap nanosensor based on luminescence resonance energy transfer between NaYF<sub>4</sub>:Yb,Ho nanoparticles and gold nanoparticles

244th National Meeting (2012)

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Highly selective and sensitive cartap nanosensor based on luminescence resonance energy transfer between NaYF4:Yb,Ho nanoparticles and gold nanoparticles

Highly selective and sensitive cartap nanosensor based on luminescence resonance energy transfer between NaYF₄:Yb,Ho nanoparticles and gold nanoparticles