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ZnO nanowires were synthesized hydrothermally on a glass substrate, and then decorated with Pt nanoparticles to fabricate the working electrode for a non-enzymatic glucose biosensor. ...The Pt nanoparticles, acting as a catalyst, enhanced the biosensor’s glucose sensitivity 10-fold in comparison with the initial ZnO nanowires electrode. Under the UV and green LEDs, the respective wavelengths of which were 367nm and 539nm, the sensing current of the Pt-nanoparticle-decorated ZnO nanowires biosensors increased ∼4 times. These biosensors under UV and green illumination feature superior sensitivity (UV: 928.1μAcm−2mM−1, green: 123.0μAcm−2mM−1) than those reported in previous non-enzymatic glucose sensing studies. The performance of these non-enzymatic glucose-sensing biosensors was enhanced by reducing the Schottky barrier and localizing the surface plasmonic resonance effect under such illumination.
Au/ZnO core–shell nanostructures decorated with Au nanoparticles were synthesized on an ITO/glass substrate. The investigated sensor contains 2-D, 1-D, and 0-D nanostructures to provide a large ...surface-area-to-volume ratio and catalytic quantum effect and to avoid the issues inherent in heterojunction interface barriers. The sensitivities of the fabricated glucose sensors in the dark and under blue and green LED illumination were 3371.9, 4410.9, and 4157.8 μA/cm2 mM–1, respectively. The achieved sensitivities are higher than previous reports on Au nanostructure sensors by 2–100 times. Further, the blue and green LED illumination respectively enhanced the sensitivity and CV glucose sensing currents by ∼30.8 and ∼23.3% and ∼27 and ∼35%. The detection limits of the glucose sensor in the dark and under visible illumination were the same at ∼0.5 μM. Moreover, these visible light illumination enhancements are attributed to the localized surface plasmon resonance effect.
This paper presents the synthesis of In 2 O 3 nanowires (NWs) through the vapor-liquid-solid growth mechanism and the fabrication of an In 2 O 3 NW ethanol gas sensor. It was found that the 1-D In 2 ...O 3 NWs could only be grown at temperatures higher than 850 °C. It was also found that the average length increased while the average diameter decreased as the growth temperature increased. For the fabricated gas sensors, the response (R a /R g ) was 1.84, 3.78, and 13.97 for the samples thermally treated at 900 °C, 950 °C, and 1000 °C, respectively, at the operating temperatures of 300 °C with 100 ppm ethanol. Disregard the sensitivity, the In 2 O 3 nanowires could be measured at 25 °C to 300 °C. Furthermore, it was found that the fabricated device was much more sensitive to ethanol gas, compared with methanol and acetone gases.
A nonenzymatic glucose photobiosensor was developed based on Au-nanoparticle-decorated TiO 2 nanorods (NRs) under visible illumination. Au nanoparticles (NPs) absorbed the visible illumination, ...resulting in surface plasmon resonance (SPR). The SPR of the Au NPs indicated that there was a strong electric field around them, which promoted the transport of more electrons to the TiO 2 NRs and enhanced the glucose sensing properties. The sensing current under visible illumination was five times higher than in the dark when in 0.1 M NaOH solution at a potential of 0.17 V. Moreover, the Michaelis-Menten constant (Km) of the Au NPs/TiO 2 NRs/FTO under visible illumination was 0.52 mM, which is much smaller than that reported previously. Moreover, these results indicate that the Au NPs/TiO 2 NRs/FTO under visible illumination feature outstanding properties as a nonenzymatic glucose photobiosensor.
In-In
2
O
3
composite nanopagodas demonstrate excellent field emission properties with an enhanced kinetics factor (saturation ratio). The turn-on fields and
β
of the In-In
2
O
3
nanopagodas were 2.0 ...V μm
−1
and 3590. The indium of the In-In
2
O
3
nanopagodas accumulates electrons and forms electron tunnels, which enhances the field emission properties.
In-In
2
O
3
composite nanopagodas demonstrate excellent field emission properties with an enhanced kinetics factor (saturation ratio).
CuO nanowires (NWs) were grown
via
the thermal oxidation of Cu film deposited on a CuO/glass template. The reduction of CuO NWs was conducted at 250, 260, 270, and 280 °C in H
2
atmosphere. It was ...found that the surfaces of CuO NWs partially transformed into Cu
via
rapid thermal annealing (RTA) under H
2
atmosphere, forming hybrid Cu/CuO NWs. The field-enhancement factors of pure CuO NWs and hybrid Cu/CuO NWs prepared at 250, 260, and 270 °C were 2624, 5702, 7897, and 79 580, respectively. The results also show that the hybrid Cu/CuO NWs efficiently reduce the turn-on field from 6.4 to 0.9 V μm
−1
.
CuO nanowires (NWs) were grown
via
the thermal oxidation of Cu film deposited on a CuO/glass template.
TiO 2 nanowires with rutile structures on a SiO 2 /Si substrate were grown by thermal evaporation. A field-emission property of the low turn-on field was reduced to 3.5 and 2.6 V/μm under UVA in 10 ...min and UVC in 25 min. The wavelength of UVC was higher than the TiO 2 band-gap, so the electrons more easily tunneled to the vacuum level and generated excess heat that lowered the turn-on field emission from under UVA. The work function of samples that had been exposed to UVA for 10 min and UVC for 25 min were reduced to 3.10 and 2.02 eV, respectively.
The authors present the fabrication of a TiO 2 nanowire ultraviolet (UV) photodetector (PD) with Iridium Schottky contact electrodes. UV-to-visible rejection ratio of the sample is around 107 when ...biased at 5 V, and the fabricated PD is visible-blind with a sharp cutoff at 390 nm. With an incident light wavelength of 390 nm and an applied bias of 5 V, the measured responsivity of the PD is 9.73 × 10 -4 A/W.
