Journal
NANOSCALE
Volume 9, Issue 42, Pages 16357-16364Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nr05577c
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Funding
- Major State Basic Research Development Program of China (973 Program) [2014CB643506]
- National Natural Science Foundation of China [11374127, 11674126, 61775080, 11674127, 11504131, 61674067]
- National Key Research and Development Program [2016YFC0207101]
- Jilin Province Natural Science Foundation of China [20150520090JH, 20170101170JC]
- Jilin Province Science Fund for Excellent Young Scholars [20170520129JH, 20170520111JH]
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Fabrication of near-infrared light-triggered photoelectrochemical (PEC) sensors based on the upconversion nanophosphors (UCNPs) is a novel approach, which exhibits the advantages of low background signal and non-damage to the biological substance as well as high sensitivity and improved electric detection in PEC sensors. Herein we demonstrate the preparation of novel and high-quality ZnO inverse opal photonic crystals (IOPCs)/Ag/NaYF4: Yb, Tm hybrid films by different advanced film techniques, including colloidal self-assembling, vapor phase deposition and pulsed laser deposition and its application to sensitive detection of alpha-fetoprotein (AFP). In the complex device, ZnO IOPCs and surface plasmon resonance (SPR) of silver had ability to largely enhance local excitation electromagnetic field of NaYF4: Yb, Tm, resulting in efficient near-infrared to visible/ultraviolet upconversion luminescence (UCL). The ultraviolet light emitted by NaYF4: Yb, Tm could b further reabsorbed by ZnO, generating PEC responses. Furthermore, because of the high specific surface area of ZnO IOPCs and the conductivity of Ag films, ZnO IOPCs/Ag/NaYF4: Yb, Tm hybrid films based near-infrared light-triggered PEC sensors showed ultrasensitive detection of AFP with a linear range from 0.05 ng mL(-1) to 100 ng mL(-1) and a low detection limit of similar to 0.04 ng mL-1 (40 pg mL(-1)). Such an advanced device also shows promise in detection of other cancer markers in clinical and biological analysis.
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