BiFeO3 nanocrystals were applied as the sensing material to isopropanol. The isopropanol sensor based on BiFeO3 nanocrystals shows excellent gas-sensing properties at the optimum working temperature of 240 °C. The sensitivity of as-prepared sensor to 100 ppm isopropanol is 31 and its response and recovery time is as fast as 6 and 17 s. The logarithmic curves of the sensitivity and concentration of BiFeO3 sensors are a very good linear in the low detection range of 2–100 ppm. In addition, the gas sensing mechanism is also discussed. The results suggest that the BiFeO3 nanomaterial can be potentially applied in isopropanol gas detection.

In this study, Strontium (Sr)-doped perovskite lanthanum manganite (La1−xSrxMnO3) nanoparticles were prepared by the sol–gel method and used as electrode materials of supercapacitors. Microstructures, morphologies, and electrochemical properties of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), a transmission electron microscope (TEM), Brunauer–Emmett–Teller (BET) surface area measurements, cyclic voltammetry (CV), and galvanostatic charge/discharge (GCD) cycling. Investigations demonstrated that the La0.85Sr0.15MnO3 nanoparticles had a maximum specific capacitance of 185.5 F/g at a current density of 0.5 A/g and a low charge transfer resistance (0.38 Ω) in 3 M KOH aqueous electrolyte solutions. La0.85Sr0.15MnO3 electrode yields the highest capacitance behavior because of the larger specific surface area, lower charge transfer resistance, and higher concentration of oxygen vacancy. This result demonstrates that Sr doping significantly improved the electrochemical properties of the LaMnO3 system. The anion-intercalation mechanism was examined by a charge–discharge process. This provides a promising electrode material for supercapacitors.

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With the advantages of short charging and discharging times, high power density, and long cycle life, supercapacitors are regarded as one of the most promising energy storage devices and have garnered massive attention in the field of energy storage. This paper prepared La1−xCaxMnO3 (x=0, 0.05, 0.1, 0.15, and 0.2) nanoparticles by the sol‐gel method. The microstructure, morphology, and electrochemical performance of the samples were characterized. The results depict that La0.85Ca0.15MnO3 has a low charge transfer resistance (0.19 Ω) and a large specific surface area (38.79 m2 g−1). The maximum specific capacitance of the La0.85Ca0.15MnO3 sample reached 248 F/g at a current density of 0.5 A/g, which is ascribable to its large specific surface area and high oxygen vacancy concentration. The anion‐intercalation mechanism was investigated by the charging and discharging process. The above results depict that Ca‐doping significantly enhances the electrochemical performance of LaMnO3 system.

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In this work, a novel heterojunction based on ZnSnO3/ZnO nanofibers was prepared by a simple electrospinning method. The crystal, structural, and surface compositional properties of ZnSnO3 and ZnSnO3/ZnO composite nanofibers were investigated by X-ray diffractometer (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectrometer (XPS), and Brunauer–Emmett–Teller (BET). Compared to pure ZnSnO3 nanofibers, the ZnSnO3/ZnO heterostructure nanofibers had high sensitivity and selectivity response with the fast response toward ethanol gas at low operational temperature. The sensing response of the sensor based on ZnSnO3/ZnO composite nanofibers was 19.6 toward 50 ppm ethanol gas at 225 °C, which was about 1.5 times superior to that of pure ZnSnO3 nanofibers. It can be owed mainly to the oxygen vacancies and the synergistic effect between ZnSnO3 and ZnO.

ObjectiveTo examine the relationship between workplace violence (WPV) and professional identity among Chinese psychiatric nurses and the mediating effects of psychological capital (PsyCap) from this association.SettingSeven public tertiary psychiatric hospitals in Liaoning Province, China.ParticipantsA total of 952 psychiatric nurses were recruited for this study. Registered nurses who have been engaged in psychiatric nursing for more than 1 year were eligible as participants in this investigation.Outcome measuresQuestionnaires consisting of the Workplace Violence Scale, the Occupational Identity Scale, the Psychological Capital Questionnaire and a demographic data sheet were used to collect participant information. We used hierarchical multiple regression and asymptotic and resampling strategies to examine the mediating role of PsyCap in the relationship between WPV and professional identity.ResultsWPV was negatively associated with professional identity after controlling for demographic factors (β=−0.353; p<0.001). PsyCap mediated the relationship between WPV and professional identity, according to the mediation analysis (a×b=−0.150, bias-corrected and accelerated 95% CI (BCa 95% CI) (−0.185 to −0.115); p<0.001). In addition, two dimensions of PsyCap: hope (a×b=−0.075, BCa 95% CI (−0.104 to −0.049); p<0.001) and resilience (a×b=−0.064, BCa 95% CI (−0.090 to −0.039); p<0.001) mediated the association between WPV and professional identity. For professional identity, hope, resilience and PsyCap mediation accounted for 21.6%, 18.1% and 42.4%, respectively.ConclusionsBased on these findings, PsyCap could partially mediate the relationship between WPV and professional identity. Therefore, hospital administrators should implement measures to prevent and reduce WPV and provide nurses with skills training programmes to improve the PsyCap such as hope and resilience.

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