Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 23, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/ijms23094745
Keywords
photoelectrochemical; chemical vapor deposition; molybdenum disulfide (MoS2); cuprous oxide (Cu2O); positive oxide trap state; DNA; biosensor
Funding
- Ministry of Science and Technology, The Republic of China [MOST 105-2923-E-194-003 MY3, 108-2823-8-194-002, 109-2622-8-194-001-TE1, 109-2622-8-194-007]
- Advanced Institute of Manufacturing with High-tech Innovations (AIM-HI)
- Center for Innovative Research on Aging Society
- Featured Areas Research Center Program
- Ministry of Education (MOE)
- Kaohsiung Armed Forces General Hospital [108-016]
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In this study, n-type MoS2 monolayer flakes were grown using chemical vapor deposition, while a p-type Cu2O thin film was grown via electrochemical deposition. The crystal structure of the MoS2 flakes was analyzed using various techniques, and the monolayer structure was confirmed. The MoS2 flakes were then transferred onto a Cu2O film to create a p-n heterogeneous structure. The properties of the samples were examined through different measurements. The fabricated biosensor showed high sensitivity to detect lung cancer cell types, reducing the current busy procedures and waiting time for detection.
In this study, n-type MoS2 monolayer flakes are grown through chemical vapor deposition (CVD), and a p-type Cu2O thin film is grown via electrochemical deposition. The crystal structure of the grown MoS2 flakes is analyzed through transmission electron microscopy. The monolayer structure of the MoS2 flakes is verified with Raman spectroscopy, multiphoton excitation microscopy, atomic force microscopy, and photoluminescence (PL) measurements. After the preliminary processing of the grown MoS2 flakes, the sample is then transferred onto a Cu2O thin film to complete a p-n heterogeneous structure. Data are confirmed via scanning electron microscopy, SHG, and Raman mapping measurements. The luminous energy gap between the two materials is examined through PL measurements. Results reveal that the thickness of the single-layer MoS2 film is 0.7 nm. PL mapping shows a micro signal generated at the 627 nm wavelength, which belongs to the B2 excitons of MoS2 and tends to increase gradually when it approaches 670 nm. Finally, the biosensor is used to detect lung cancer cell types in hydroplegia significantly reducing the current busy procedures and longer waiting time for detection. The results suggest that the fabricated sensor is highly sensitive to the change in the photocurrent with the number of each cell, the linear regression of the three cell types is as high as 99%. By measuring the slope of the photocurrent, we can identify the type of cells and the number of cells.
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