Journal
ANALYTICAL CHEMISTRY
Volume 92, Issue 10, Pages 6886-6892Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.9b05432
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Funding
- National Key Research and Development Program of China [2017YFA0700404]
- National Natural Science Foundation of China [21535003, 21575022]
- Key Research & Development Plan of Jiangsu Province [BE2018617]
- Fundamental Research Funds for the Central Universities [2242016K41055]
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX19_0073]
- Qingdao University of Science and Technology [STAM201801]
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Low-toxicity gold nanoclusters-decorated Ag@SiO2 (Au NCs-Ag@SiO2) nanocomposites modified plasmonic photoelectrodes were first fabricated to improve the photoelectric properties of Au NCs and practical application in biological detection. Through adjusting distance between Au NCs and plasmonic silver nanoparticles (Ag NPs), the photocurrent intensity of Au NCs enhanced by 3.8 times attributed to strong competition between enhancement functions of hot electron transfer, local electric field, light scattering effects, and quenching functions of nonradiative energy transfer. Further comparison between experimental results and theoretical simulations were conducted to gain a deeper understanding toward the photoelectric enhancement mechanism. Moreover, Au NCs-Ag@SiO2 nanocomposites was successfully applied to the construction of photoelectrochemical (PEC) biosensors for sensitively detecting alkaline phosphatase activity. This proposed PEC biosensor showed a wide linear range from 0.04 to 400 U.L-1, and a low detection limit of 0.022 U.L-1.
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