Journal
NANOMATERIALS
Volume 12, Issue 8, Pages -Publisher
MDPI
DOI: 10.3390/nano12081305
Keywords
tungsten di-selenide; gate-tunable; biosensor; orientation control; protein detection
Categories
Funding
- National Research Foundation, Korea [2022R1G1A1009887]
- ministry of Science and ICT
- Deanship of Scientific Research at King Khalid University Saudi Arabia [R.G.P.2/188/43]
- National Research Foundation of Korea [2022R1G1A1009887] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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By combining high-quality monolayer WSe2 with our designed Pyrene-based receptor moiety, we have achieved an ordered orientation on the WSe2 FET biosensor, enabling sensitive detection of our target protein (streptavidin) with a 1 pM limit of detection in just 2 minutes, offering ultra-fast response and high sensitivity, making it a reliable platform for point-of-care-based diagnosis.
Field-effect transistors (FET) composed of transition metal dichalcogenide (TMDC) materials have gained huge importance as biosensors due to their added advantage of high sensitivity and moderate bandgap. However, the true potential of these biosensors highly depends upon the quality of TMDC material, as well as the orientation of receptors on their surfaces. The uncontrolled orientation of receptors and screening issues due to crossing the Debye screening length while functionalizing TMDC materials is a big challenge in this field. To address these issues, we introduce a combination of high-quality monolayer WSe2 with our designed Pyrene-based receptor moiety for its ordered orientation onto the WSe2 FET biosensor. A monolayer WSe2 sheet is utilized to fabricate an ideal FET for biosensing applications, which is characterized via Raman spectroscopy, atomic force microscopy, and electrical prob station. Our construct can sensitively detect our target protein (streptavidin) with 1 pM limit of detection within a short span of 2 min, through a one-step functionalizing process. In addition to having this ultra-fast response and high sensitivity, our biosensor can be a reliable platform for point-of-care-based diagnosis.
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