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Electrochemically Exfoliated High‐Quality 2H‐MoS 2 for Multiflake Thin Film Flexible Biosensors
Author(s) -
Zhang Panpan,
Yang Sheng,
PinedaGómez Roberto,
Ibarlucea Bergoi,
Ma Ji,
Lohe Martin R.,
Akbar Teuku Fawzul,
Baraban Larysa,
Cuniberti Gianaurelio,
Feng Xinliang
Publication year - 2019
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201901265
Subject(s) - exfoliation joint , materials science , fabrication , molybdenum disulfide , nanotechnology , substrate (aquarium) , biosensor , polyimide , thin film , optoelectronics , graphene , composite material , medicine , oceanography , alternative medicine , pathology , layer (electronics) , geology
2D molybdenum disulfide (MoS 2 ) gives a new inspiration for the field of nanoelectronics, photovoltaics, and sensorics. However, the most common processing technology, e.g., liquid‐phase based scalable exfoliation used for device fabrication, leads to the number of shortcomings that impede their large area production and integration. Major challenges are associated with the small size and low concentration of MoS 2 flakes, as well as insufficient control over their physical properties, e.g., internal heterogeneity of the metallic and semiconducting phases. Here it is demonstrated that large semiconducting MoS 2 sheets (with dimensions up to 50 µm) can be obtained by a facile cathodic exfoliation approach in nonaqueous electrolyte. The synthetic process avoids surface oxidation thus preserving the MoS 2 sheets with intact crystalline structure. It is further demonstrated at the proof‐of‐concept level, a solution‐processed large area (60 × 60 µm) flexible Ebola biosensor, based on a MoS 2 thin film (6 µm thickness) fabricated via restacking of the multiple flakes on the polyimide substrate. The experimental results reveal a low detection limit (in femtomolar–picomolar range) of the fabricated sensor devices. The presented exfoliation method opens up new opportunities for fabrication of large arrays of multifunctional biomedical devices based on novel 2D materials.