Intense pulsed light induced platinum-gold alloy formation on carbon nanotubes for non-enzymatic glucose detection
- Intense pulsed light induced platinum-gold alloy formation on carbon nanotubes for non-enzymatic glucose detection
- Jongeun Ryu; 김경현; 김학성; 한홍택; David Lashmore
- Glucose sensor; Intense pulsed light; Carbon nanotubes; Photothermal dewetting; Nanoparticle; Platinum alloy
- Issue Date
- Biosensors & bioelectronics
- VOL 26, NO 2, 602-607
- We demonstrated a novel method for the formation of alloy nano-islands on carbon nanotube (CNT).
The two metal layers (Pt, Au) were sputtered on CNTs and the intense pulsed light (IPL) was irradiated
on the metal layers. The absorbed light provides enough energy for the diffusion mixing between Pt
and Au, forming Pt–Au alloy phase. While the alloy is being formed by the IPL irradiation, the metal
layers are broken into nano-islands on CNT due to the surface energy minimization between the metal
layers and CNT. The surface characterizations of the Pt–Au/CNT were performed with X-ray diffraction,
scanning electron microscope, and energy-dispersive X-ray spectroscopy. Different compositions of alloy
nanoparticles were obtained by adjusting the deposition thicknesses of Pt and Au on CNT. Pt50Au50/CNT
electrode showed the highest glucose oxidation current peak among Pt, Pt70Au30, Pt50Au50, Pt30Au70, and
Au/CNT electrodes while the electroactive surface areas of them are kept to be similar (average surface
area = 7.00cm2, coefficient of variation = 0.06). The amperometric response of Pt50Au50/CNT electrode to
the glucose concentrations showed a wide linear range up to 24.44mM with a high detection sensitivity
of 10.71μAmM−1 cm−2. Reproducibility and long-term stability of the Pt–Au/CNT electrode were also
proven in the experiments.
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