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In this paper, an improved method for the electric performance of polypropylene (PP) film was proposed to promote the safety and stability of power capacitors. Modified PP films containing three different polycyclic compounds were prepared, which showed good thermal properties and decreased DC conductivity. The DC breakdown strength of the modified PP films under both positive and negative voltage is increased compared with that of the original film. The deep traps introduced by polycyclic compounds and the decreased carrier mobility give an explanation of the decreased DC conductivity. A quantum chemistry calculation was further performed to clarify the mechanism for improving electrical performance, presenting that polycyclic compounds with a high electron affinity and low ionization energy can capture high-energy electrons, protecting the PP molecular chain from attack, and then increase the breakdown strength. It is concluded that the modified PP films by polycyclic compounds have great potential in improving the insulating properties of power capacitors.

In this Letter, we propose an integrated two-dimensional magnetometer module based on nitrogen vacancy centers in diamond. The sensor has a constructed area of 7.12 cm2 and exhibits a magnetic-field sensitivity of approximately 25.12 nT/Hz1/2. By placing anti-microwave shield nets optimizing interference distance, the integrated scheme eliminates the effects of microwave interference on the amplifier. We propose the fixed-frequency optical detection of magnetic resonance, which is used to measure the relation between the magnetic field and the photoluminescence by scanning the magnetic field. Without relying on the lock-in technique, we developed an algorithm for analyzing the magnetic noise based on the PL noise analysis.