Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 6, Pages 5933-5940Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b16511
Keywords
surface plasmon-resonance; interface; halloysite nanotubes; sensitivity; refractive index
Funding
- National Natural Science Foundation of China [61575084, 51502113, 61405075, 61475066, 61505069]
- National High Technology Research and Development Program of China [2015AA020915]
- Natural Science Foundation of Guangdong Province [2015A030313320, 2015A030306046, 2016A030311019, 2016A030313079, 2016A030310098]
- Science and Technology Projects of Guangdong Province [2017A010101013, 2015B010125007, 2016B010111003, 2016A010101017]
- Science & Technology Project of Guangzhou [201707010500, 201506010046, 201607010134, 201605030002, 20161001002]
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We propose and demonstrate a novel strategy to modify the plasmonic interface by using a thin layer of halloysite nanotubes (HNTs). The modified surface plasmon resonance (SPR) sensor achieves a greatly improved sensitivity because the large surface area and high refractive index of the HNTs layer significantly increase the probing electric field intensity and hence the measurement sensitivity. More significantly, the thickness of the HNTs layer can be tailored by spraying different concentrations of HNTs ethanol suspension. The proposed sensors show significant superiority in terms of the highest sensitivity (10431 nm/RIU) and the enhancement fold (5.6-folds) over those reported previously. Additionally, the proposed approach is a chemical-free and environment-friendly modification method for the sensor interface, without additional chemical or biological amplification steps (no toxic solvents are used). These unique features make the proposed HNTs-SPR biosensor a simple, biocompatible, and low-cost platform for the trace-level detection of biochemical species in a rapid, sensitive, and nondestructive manner.
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