A novel
NiO-decorated flexible buckypaper (NiO-BP) was fabricated
by a simple and scalable vacuum filtration method for electrochemical
detection of glucose. The NiO-BP consists of two layers: one side
is composed of purified single-walled carbon nanotubes, serving as
the supporting layer, whereas the other side comprises NiO-loaded
single-walled carbon nanotubes, serving as the catalyst layer. The
morphology and structure of NiO-BP were characterized by scanning
electron microscopy, transmission electron microscopy, X-ray diffraction
and Raman spectroscopy. The fabricated NiO-BP was applied to the electrochemical
detection of glucose. Under optimized conditions, the sensor exhibited
a wide linear range of 0.1–9 mM for the determination of glucose
with high sensitivity (2701 μA mM–1 cm–2) and a short response time (<2.5 s). The present
work reveals that the buckypaper with a unique double-layer structure
is promising for wearable biosensors.
Long linear carbon chains with sp hybridization inside multi-walled carbon nanotubes (LLCC@MWCNTs) can be prepared in the cathode deposits obtained by hydrogen arc discharge. In this work, a cooling system was introduced into the hydrogen arc discharge method to improve the growth yield of LLCC@MWCNTs samples, as indicated by the corresponding stronger Raman peaks between 1780 cm-1 and 1880 cm-1, compared with conventional systems. Moreover, the cooling largely expanded the narrow scope of suitable conditions for the preparation of LLCC@MWCNTs, and high purity samples were easily produced. Qualitative analysis of arc discharge process helped conclude that cooling helps to increase the temperature of arc plasma, which is beneficial to improve both the growth yield of LLCC@MWCNTs and the purity of MWCNTs. This work provides a new approach to improve the growth yield of LLCC@MWCNTs and will benefit further studies and future applications of this new one-dimensional allotrope.
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