Ni-doped ZnO nanowire arrays (Ni–ZnO NRs) with
different
Ni concentrations are grown on etched fluorine-doped tin oxide electrodes
by the hydrothermal method. The Ni–ZnO NRs with a nickel precursor
concentration of 0–12 at. % are adjusted to improve the selectivity
and response of the devices. The NRs’ morphology and microstructure
are investigated by scanning electron microscopy and high-resolution
transmission electron microscopy. The sensitive property of the Ni–ZnO
NRs is measured. It is found that the Ni–ZnO NRs with an 8
at. % Ni precursor concentration have high selectivity for H2S and a large response of 68.9 at 250 °C compared to other gases
including ethanol, acetone, toluene, and nitrogen dioxide. Their response/recovery
time is 75/54 s. The sensing mechanism is discussed in terms of doping
concentration, optimum operating temperature, gas type, and gas concentration.
The enhanced performance is related to the regularity degree of the
array and the doped Ni3+ and Ni2+ ions, which
increases the active sites for oxygen and target gas adsorption on
the surface.
Lead halide perovskites have drawn extensive attention on account of their fundamental role in the field of photoelectric detection. Nevertheless, the existence of toxic lead ions and the instability of lead-based perovskites greatly hamper their applications in mass production and commercialization. Herein, a hybrid photodetector based on the lead-free inorganic perovskite nanoflake (Cs 3 Sb 2 Br 9 NF)/monoradicular CdSe nanobelt (NB) has been successfully prepared. The hybrid nanostructures promote the effective separation of electron−hole pairs, thus dramatically improving the photoelectric performance. Meanwhile, the Cs 3 Sb 2 Br 9 NF/CdSe NB photodetector possesses a wideband spectral response from 300 to 780 nm and shows a higher responsivity (174 A/W), external quantum efficiency (4.8 × 10 4 %), and photodetectivity (1.1 × 10 14 Jones) under 448 nm illumination. Overall, these superior photoelectric properties confirm that the Cs 3 Sb 2 Br 9 NF/CdSe NB is a kind of hybrid optoelectronic device with practical application in civilian and military fields.
Bi2WO6 flower-like materials (FMs) were prepared by hydrothermal method
and reduced by in situ reduction reaction to obtain Au@Bi2WO6 FMs. The
samples were characterized by X-ray diffraction (XRD), scanning electron
microscope (SEM), transmission electron microscopy (TEM),
high-resolution transmission electron microscopy (HRTEM), and X-ray
photoelectron spectroscopy (XPS). It is found that the calculated OV
content of Au@Bi2WO6 FMs is 25.16% whereas that of Bi2WO6 FMs is
20.81%, which provided potential active sites for gas adsorption and
then enhanced excellent sensing property. In addition, the performance
of Au@Bi2WO6 FMs sensors was evaluated by detecting volatile and toxic
gases such as formaldehyde, methanol, acetone, benzene, toluene, and
xylene. It revealed that the optimal operating temperatures for the
Bi2WO6 FMs and Au@Bi2WO6 FMs sensors were 290°C and 260°C, respectively.
Compared Au@ Bi2WO6 FMs sensor and Bi2WO6 FMs one, the best response of
the front was 250 (900) to 100 (800) ppm formaldehyde whereas that of
the latter was 90 (230). Therefore, Au@ Bi2WO6 FMs have good response
and selectivity, which are promising candidates for formaldehyde
detection.
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