Layered double hydroxides (LDHs) have a special structure and atom composition, which are expected to be an excellent electromagnetic wave (EMW) absorber. However, it is still a problem that obtaining excellent EMW-absorbing materials from LDHs. Herein, we designed heterostructure NiCo-LDHs@ZnO nanorod and then subsequent heat treating to derive NiCo@C/ZnO composites. Finally, with the synergy of excellent dielectric loss and magnetic loss, an outstanding absorption performance could be achieved with the reflection loss of − 60.97 dB at the matching thickness of 2.3 mm, and the widest absorption bandwidth of 6.08 GHz was realized at 2.0 mm. Moreover, this research work provides a reference for the development and utilization of LDHs materials in the field of microwave absorption materials and can also provide ideas for the design of layered structural absorbers.
The health hazards caused by phenolic pollution are very serious and it's urgent to explore sensitive detection methods of phenols. Here, the partially-reduced-GO-sheet-covered polyaniline nanotubes (PANI-GO) was prepared by in-situ redox interaction between GO and PANI. The redox process was confirmed by Fourier transform infrared spectrometer and X-ray photoelectron spectroscopy. This nanocomposite sheet was evenly distributed on a glassy carbon electrode (PANI-GO/GCE). Cyclic voltammetry and electrochemical impedance spectroscopy characterization indicated that this PANI-GO facilitated the charge transfer with enhanced current response by using Fe(CN) 63−/4− as a probe. The PANI-GO/GCE was applied successfully for the simultaneous determination of bisphenol A (BPA) and phenol with a wider peak-to-peak separation (140 mV) than that (97 mV) on bare GCE. Under optimal conditions, the PANI-GO/GCE exhibited a highly sensitive response to BPA and phenol oxidation in wide linear ranges of 2.0 × 10 −9 ∼ 3.0 × 10 −6 mol L −1 and 1.0 × 10 −8 ∼ 1.0 × 10 −5 mol L −1 , respectively. The limits of detection of BPA and phenol were 5.0 × 10 −10 mol L −1 and 4.5 × 10 −9 mol L −1 (S/N>3), respectively. The determination results of trace amount of BPA in the water sample from plastic products by the PANI-GO/GCE are in good agreement with the ones from Ultra Performance Liquid Chromatograph-Mass Spectroscopy.
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