Using p-type PbS Quantum Dots to Quench Photocurrent of Fullerene-Au NP@MoS Composite Structure for Ultrasensitive Photoelectrochemical Detection of ATP.

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2017
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Abstract
Ultrasensitive and rapid quantification of the universal energy currency adenosine triphosphate (ATP) is an extremely critical mission in clinical applications. In this work, a "signal-off" photoelectrochemical (PEC) biosensor was designed for ultrasensitive ATP detection based on a fullerene (C)-decorated Au nanoparticle@MoS (C-Au NP@MoS) composite material as a signal indicator and a p-type PbS quantum dot (QD) as an efficient signal quencher. Modification of wide band gap C with narrow band gap MoS to form an ideal PEC signal indicator was proposed, which could significantly improve photocurrent conversion efficiency, leading to a desirable PEC signal. In the presence of p-type PbS QDs, the PEC signal of n-type C-Au NP@MoS was effectively quenched because p-type PbS QDs could compete with C-Au NP@MoS to consume light energy and electron donor. Besides, the conversion of a limited amount of target ATP into an amplified output PbS QD-labeled short DNA sequence (output S) was achieved via target-mediated aptazyme cycling amplification strategy, facilitating ultrasensitive ATP detection. The proposed signal-off PEC strategy exhibited a wide linear range from 1.00 × 10 pM to 100 nM with a low detection limit of 3.30 fM. Importantly, this proposed strategy provides a promising platform to detect ATP at ultralow levels and has potential applications, including diagnosis of ATP-related diseases, monitoring of diseases progression and evaluation of prognosis.
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li2017usingacs Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Li, Meng-Jie;Zheng, Ying-Ning;Liang, Wen-Bin;Yuan, Ruo;Chai, Ya-Qin;
Journal ACS applied materials & interfaces
Year 2017
DOI
10.1021/acsami.7b13894
URL
Keywords
photoelectrochemical biosensor adenosine triphosphate fullerene decorated au nanoparticle@mos2 p-type pbs quantum dots signal indicator signal quencher

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