Journal
ADVANCED SCIENCE
Volume 5, Issue 6, Pages -Publisher
WILEY
DOI: 10.1002/advs.201701053
Keywords
bending stability; biomedical applications; C-reactive protein (CRP) sensors; organic transistors; ultraflexibility
Categories
Funding
- General Research Fund (GRF) [HKU 17204517, 17200314, 17264016]
- National Natural Science Foundation of China (NSFC)
- Research Grants Council (RGC) of Hong Kong [N_HKU715/14]
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Organic field-effect transistors (OFETs)-based sensors have a great potential to be integrated with the next generation smart surgical tools for monitoring different real-time signals during surgery. However, allowing ultraflexible OFETs to have compatibility with standard medical sterilization procedures remains challenging. A novel capsule-like OFET structure is demonstrated by utilizing the fluoropolymer CYTOP to serve both encapsulation and peeling-off enhancement purposes. By adapting a thermally stable organic semiconductor, 2,10-diphenylbis[1]benzothieno[2,3-d;2,3-d]naphtho[2,3-b;6,7-b]dithiophene (DPh-BBTNDT), these devices show excellent stability in their electrical performance after sterilizing under boiling water and 100 degrees C-saturated steam for 30 min. The ultrathin thickness (630 nm) enables the device to have superb mechanical flexibility with smallest bending radius down to 1.5 mu m, which is essential for application on the highly tortuous medical catheter inside the human body. By immobilizing anti-human C-reactive protein (CRP) (an inflammation biomarker) monoclonal antibody on an extended gate of the OFET, a sensitivity for detecting CRP antigen down to 1 mu g mL(-1) can be achieved. An ecofriendly water floatation method realized by employing the wettability difference between CYTOP and polyacrylonitrile (PAN) can be used to transfer the device on a ventricular catheter, which successfully distinguishes an inflammatory patient from a healthy one.
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