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We report a simple and scalable process to synthesize the core–shell
nanostructure of MoS2@N-doped carbon nanosheets (MoS2@C),
in which polydopamine is coated on the MoS2 surface and then
carbonized. Transmission electron microscopy reveals that the as-synthesized
MoS2@C possesses a nanoscopic and ultrathin layer of
MoS2 sheets with a thin and conformal coating of carbon layers
(∼5 nm). The MoS2@C demonstrates a superior
electrochemical performance as an anode material for lithium ion batteries
compared to exfoliated MoS2 sample. This unique core–shell
structure is capable of excellent delivery of Li+ ion in
charging–discharging process: a specific capacity as high as 1239 mA
h g−1, a high rate of charging-discharging capability even
at a high current rate of 10 A g−1 while retaining 597 mA
h g−1, and a good cycle stability over 70 cycles at a high
current rate of 2 A g−1.
A cylindrical-shaped micropillar array embedded microfluidic device was proposed to enhance the dispersion of cell clusters and the efficiency of single cell encapsulation in hydrogel. Different sizes of micropillar arrays act as a sieve to break Escherichia coli (E. coli) aggregates into single cells in polyethylene glycol diacrylate (PEGDA) solution. We applied the external force for the continuous breakup of cell clusters, resulting in the production of more than 70% of single cells into individual hydrogel particles. This proposed strategy and device will be a useful platform to utilize genetically modified microorganisms in practical applications.
The advanced electrodes for detecting organophosphate pesticides were prepared by modification of the gold (Au) electrode with the reduced graphene oxide/ionic liquid (RGO/IL) nanohybrids. Due to the cationic and anionic parts, the ILs on RGO sheets provide the amount of functional groups for dispersion of hybrids and immobilization of organophosphorus hydrolase (OPH) enzymes. After the immobilization of OPH on the RGO/IL-modified Au electrodes, the modified electrodes represent faster electron transfer than that of Au electrode, resulting in high performance of biosensor with response time (~ 10 s) and sensitivity (4.56 nA μM−1). In addition, the OPH/RGO/IL-modified Au electrode displayed good stability and reproducibility.
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